Dadenie virtual machine based on Linux 5.7

Linux Operating System is installed on a virtual machine that is deployed on VSphere 4.0. On the virtual machine deployed database Oracle 11.2.0.1.
The other day there was the fall of the virtual machine with the database. First, the process was killed DBW0 respectively, and stopped the database.
After that, after some time the process has caused vmmemctl oom-killer, and the operating system to hang.
Tell me because of what might fall in a virtual machine and in what direction to dig. Download the database is minimal. In this night it did not loaded.
Cutting from log file Linux:
Aug 3 23:27:54 dbhyperion kernel: vmtoolsd invoked oom-killer: gfp_mask=0x201da, order=0, oom_adj=0
Aug 3 23:27:54 dbhyperion kernel: vmtoolsd cpuset=/ mems_allowed=0
Aug 3 23:27:54 dbhyperion kernel: Pid: 2510, comm: vmtoolsd Not tainted 2.6.32-200.13.1.el5uek #1
Aug 3 23:27:54 dbhyperion kernel: Call Trace:
Aug 3 23:27:54 dbhyperion kernel: [<ffffffff810a0b66>] ? cpuset_print_task_mems_allowed+0x92/0x9e
Aug 3 23:27:54 dbhyperion kernel: [<ffffffff810d9ae6>] oom_kill_process+0x85/0x25b
Aug 3 23:27:54 dbhyperion kernel: [<ffffffff810d9fbc>] ? select_bad_process+0xbc/0x102
Aug 3 23:27:54 dbhyperion kernel: [<ffffffff810da03f>] __out_of_memory+0x3d/0x86
Aug 3 23:27:54 dbhyperion kernel: [<ffffffff810da30f>] out_of_memory+0xfc/0x195
Aug 3 23:27:54 dbhyperion kernel: [<ffffffff810dd75e>] __alloc_pages_nodemask+0x487/0x595
Aug 3 23:27:54 dbhyperion kernel: [<ffffffff811088da>] alloc_pages_current+0x9b/0xa4
Aug 3 23:27:54 dbhyperion kernel: [<ffffffff810d774f>] __page_cache_alloc+0x5c/0x61
Aug 3 23:27:54 dbhyperion kernel: [<ffffffff810df800>] __do_page_cache_readahead+0x81/0x196
Aug 3 23:27:55 dbhyperion kernel: [<ffffffff81076ded>] ? wake_bit_function+0x0/0x2f
Aug 3 23:27:55 dbhyperion kernel: [<ffffffff810df936>] ra_submit+0x21/0x25
Aug 3 23:27:56 dbhyperion kernel: [<ffffffff810d8d1e>] filemap_fault+0x15e/0x353
Aug 3 23:27:56 dbhyperion kernel: [<ffffffff81115a0a>] ? lookup_page_cgroup+0x32/0x48
Aug 3 23:27:56 dbhyperion kernel: [<ffffffff810efde5>] __do_fault+0x59/0x37c
Aug 3 23:27:57 dbhyperion kernel: [<ffffffff811159d6>] ? __pfn_to_section+0x12/0x14
Aug 3 23:27:57 dbhyperion kernel: [<ffffffff81115a0a>] ? lookup_page_cgroup+0x32/0x48
Aug 3 23:27:57 dbhyperion kernel: [<ffffffff810f1ba3>] handle_mm_fault+0x14b/0x80f
Aug 3 23:27:58 dbhyperion kernel: [<ffffffff8104367e>] ? need_resched+0x23/0x2d
Aug 3 23:27:58 dbhyperion kernel: [<ffffffff81043696>] ? should_resched+0xe/0x2f
Aug 3 23:27:58 dbhyperion kernel: [<ffffffff81456006>] do_page_fault+0x210/0x299
Aug 3 23:27:58 dbhyperion kernel: [<ffffffff81453fd5>] page_fault+0x25/0x30
Aug 3 23:27:58 dbhyperion kernel: Mem-Info:
Aug 3 23:27:58 dbhyperion kernel: Node 0 DMA per-cpu:
Aug 3 23:27:58 dbhyperion kernel: CPU 0: hi: 0, btch: 1 usd: 0
Aug 3 23:27:58 dbhyperion kernel: CPU 1: hi: 0, btch: 1 usd: 0
Aug 3 23:27:58 dbhyperion kernel: Node 0 DMA32 per-cpu:
Aug 3 23:27:58 dbhyperion kernel: CPU 0: hi: 186, btch: 31 usd: 0
Aug 3 23:27:58 dbhyperion kernel: CPU 1: hi: 186, btch: 31 usd: 0
Aug 3 23:27:58 dbhyperion kernel: Node 0 Normal per-cpu:
Aug 3 23:27:58 dbhyperion kernel: CPU 0: hi: 186, btch: 31 usd: 27
Aug 3 23:27:59 dbhyperion kernel: CPU 1: hi: 186, btch: 31 usd: 29
Aug 3 23:27:59 dbhyperion kernel: active_anon:735 inactive_anon:325 isolated_anon:0
Aug 3 23:27:59 dbhyperion kernel: active_file:53 inactive_file:140 isolated_file:0
Aug 3 23:27:59 dbhyperion kernel: unevictable:1112 dirty:9 writeback:6 unstable:0
Aug 3 23:28:00 dbhyperion kernel: free:9583 slab_reclaimable:3158 slab_unreclaimable:30263
Aug 3 23:28:00 dbhyperion kernel: mapped:1039 shmem:202 pagetables:24186 bounce:0
Aug 3 23:28:01 dbhyperion kernel: Node 0 DMA free:15776kB min:24kB low:28kB high:36kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:15292kB mlocked:0kB dirty:0kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:0kB slab_unreclaimable:0kB kernel_stack:0kB pagetables:0kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? yes
Aug 3 23:28:01 dbhyperion kernel: lowmem_reserve[]: 0 3000 6030 6030
Aug 3 23:28:01 dbhyperion kernel: Node 0 DMA32 free:17308kB min:4936kB low:6168kB high:7404kB active_anon:348kB inactive_anon:372kB active_file:40kB inactive_file:64kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:3072160kB mlocked:0kB dirty:0kB writeback:0kB mapped:124kB shmem:116kB slab_reclaimable:780kB slab_unreclaimable:1060kB kernel_stack:216kB pagetables:21868kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:320 all_unreclaimable? no
Aug 3 23:28:01 dbhyperion kernel: lowmem_reserve[]: 0 0 3030 3030
Aug 3 23:28:01 dbhyperion kernel: Node 0 Normal free:5248kB min:4988kB low:6232kB high:7480kB active_anon:2592kB inactive_anon:928kB active_file:172kB inactive_file:496kB unevictable:4448kB isolated(anon):0kB isolated(file):0kB present:3102720kB mlocked:4448kB dirty:36kB writeback:44kB mapped:4032kB shmem:692kB slab_reclaimable:11852kB slab_unreclaimable:119992kB kernel_stack:1904kB pagetables:74876kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:1504 all_unreclaimable? no
Aug 3 23:28:01 dbhyperion kernel: lowmem_reserve[]: 0 0 0 0
Aug 3 23:28:01 dbhyperion kernel: Node 0 DMA: 4*4kB 2*8kB 2*16kB 1*32kB 3*64kB 1*128kB 0*256kB 0*512kB 1*1024kB 1*2048kB 3*4096kB = 15776kB
Aug 3 23:28:01 dbhyperion kernel: Node 0 DMA32: 257*4kB 199*8kB 120*16kB 87*32kB 58*64kB 15*128kB 1*256kB 0*512kB 0*1024kB 0*2048kB 1*4096kB = 17308kB
Aug 3 23:28:01 dbhyperion kernel: Node 0 Normal: 367*4kB 7*8kB 1*16kB 0*32kB 0*64kB 0*128kB 0*256kB 1*512kB 1*1024kB 1*2048kB 0*4096kB = 5124kB
Aug 3 23:28:01 dbhyperion kernel: 1748 total pagecache pages
Aug 3 23:28:01 dbhyperion kernel: 562 pages in swap cache
Aug 3 23:28:01 dbhyperion kernel: Swap cache stats: add 2091542, delete 2090980, find 1801328/1932208
Aug 3 23:28:01 dbhyperion kernel: Free swap = 9532960kB
Aug 3 23:28:01 dbhyperion kernel: Total swap = 11711376kB
Aug 3 23:28:01 dbhyperion kernel: 1572848 pages RAM
Aug 3 23:28:01 dbhyperion kernel: 42579 pages reserved
Aug 3 23:28:01 dbhyperion kernel: 21230 pages shared
Aug 3 23:28:01 dbhyperion kernel: 1493889 pages non-shared
Aug 3 23:28:01 dbhyperion kernel: Out of memory: kill process 7916 (perl) score 1724610 or a child
Aug 3 23:28:01 dbhyperion kernel: Killed process 7936 (java)
Aug 3 23:28:01 dbhyperion kernel: java invoked oom-killer: gfp_mask=0x200da, order=0, oom_adj=0
Aug 3 23:28:01 dbhyperion kernel: java cpuset=/ mems_allowed=0
Aug 3 23:28:01 dbhyperion kernel: Pid: 8046, comm: java Not tainted 2.6.32-200.13.1.el5uek #1
Aug 3 23:28:01 dbhyperion kernel: Call Trace:
Aug 3 23:28:01 dbhyperion kernel: [<ffffffff810a0b66>] ? cpuset_print_task_mems_allowed+0x92/0x9e
Aug 3 23:28:01 dbhyperion kernel: [<ffffffff810d9ae6>] oom_kill_process+0x85/0x25b
Aug 3 23:28:01 dbhyperion kernel: [<ffffffff810d9fbc>] ? select_bad_process+0xbc/0x102
Aug 3 23:28:01 dbhyperion kernel: [<ffffffff810da03f>] __out_of_memory+0x3d/0x86
Aug 3 23:28:01 dbhyperion kernel: [<ffffffff810da30f>] out_of_memory+0xfc/0x195
Aug 3 23:28:01 dbhyperion kernel: [<ffffffff810dd75e>] __alloc_pages_nodemask+0x487/0x595
Aug 3 23:28:01 dbhyperion kernel: [<ffffffff811075ac>] alloc_page_vma+0xb9/0xc8
Aug 3 23:28:01 dbhyperion kernel: [<ffffffff810ff0a7>] read_swap_cache_async+0x52/0xf1
Aug 3 23:28:01 dbhyperion kernel: [<ffffffff810ff1a3>] swapin_readahead+0x5d/0x9c
Aug 3 23:28:01 dbhyperion kernel: [<ffffffff810d725a>] ? find_get_page+0x22/0x69
Aug 3 23:28:01 dbhyperion kernel: [<ffffffff810f1ea3>] handle_mm_fault+0x44b/0x80f
Aug 3 23:28:01 dbhyperion kernel: [<ffffffff81079530>] ? __remove_hrtimer+0x7b/0x89
Aug 3 23:28:01 dbhyperion kernel: [<ffffffff81079c8f>] ? unlock_hrtimer_base+0x18/0x1a
Aug 3 23:28:01 dbhyperion kernel: [<ffffffff81079d65>] ? hrtimer_try_to_cancel+0x40/0x4b
Aug 3 23:28:01 dbhyperion kernel: [<ffffffff81456006>] do_page_fault+0x210/0x299
Aug 3 23:28:01 dbhyperion kernel: [<ffffffff81453fd5>] page_fault+0x25/0x30
Aug 3 23:28:01 dbhyperion kernel: [<ffffffff81239ddc>] ? __get_user_8+0x1c/0x23
Aug 3 23:28:01 dbhyperion kernel: [<ffffffff8108462d>] ? fetch_robust_entry+0x28/0x51
Aug 3 23:28:01 dbhyperion kernel: [<ffffffff81085131>] exit_robust_list+0x3d/0xfd
Aug 3 23:28:01 dbhyperion kernel: [<ffffffff8105cd6f>] ? jiffies_to_timespec+0x26/0x35
Aug 3 23:28:01 dbhyperion kernel: [<ffffffff81057396>] mm_release+0x30/0x106
Aug 3 23:28:01 dbhyperion kernel: [<ffffffff81059f8d>] exit_mm+0x26/0x127
Aug 3 23:28:01 dbhyperion kernel: [<ffffffff8105b581>] do_exit+0x209/0x696
Aug 3 23:28:01 dbhyperion kernel: [<ffffffff81068988>] ? freezing+0x13/0x15
Aug 3 23:28:01 dbhyperion kernel: [<ffffffff8105baae>] sys_exit_group+0x0/0x1b
Aug 3 23:28:01 dbhyperion kernel: [<ffffffff8106bdff>] get_signal_to_deliver+0x303/0x328
Aug 3 23:28:01 dbhyperion kernel: [<ffffffff810111f6>] do_notify_resume+0x90/0x6d7
Aug 3 23:28:01 dbhyperion kernel: [<ffffffff810450ca>] ? __dequeue_entity+0x33/0x38
Aug 3 23:28:01 dbhyperion kernel: [<ffffffff8107e2b4>] ? timekeeping_get_ns+0x1b/0x3d
Aug 3 23:28:01 dbhyperion kernel: [<ffffffff81123593>] ? path_put+0x22/0x27
Aug 3 23:28:01 dbhyperion kernel: [<ffffffff8101207e>] int_signal+0x12/0x17
Aug 3 23:28:01 dbhyperion kernel: Mem-Info:
Aug 3 23:28:01 dbhyperion kernel: Node 0 DMA per-cpu:
Aug 3 23:28:01 dbhyperion kernel: CPU 0: hi: 0, btch: 1 usd: 0
Aug 3 23:28:01 dbhyperion kernel: CPU 1: hi: 0, btch: 1 usd: 0
Aug 3 23:28:01 dbhyperion kernel: Node 0 DMA32 per-cpu:
Aug 3 23:28:01 dbhyperion kernel: CPU 0: hi: 186, btch: 31 usd: 0
Aug 3 23:28:01 dbhyperion kernel: CPU 1: hi: 186, btch: 31 usd: 5
Aug 3 23:28:01 dbhyperion kernel: Node 0 Normal per-cpu:
Aug 3 23:28:01 dbhyperion kernel: CPU 0: hi: 186, btch: 31 usd: 56
Aug 3 23:28:01 dbhyperion kernel: CPU 1: hi: 186, btch: 31 usd: 70
Aug 3 23:28:01 dbhyperion kernel: active_anon:660 inactive_anon:309 isolated_anon:0
Aug 3 23:28:01 dbhyperion kernel: active_file:0 inactive_file:10 isolated_file:0
Aug 3 23:28:01 dbhyperion kernel: unevictable:1112 dirty:0 writeback:0 unstable:0
Aug 3 23:28:01 dbhyperion kernel: free:9672 slab_reclaimable:3148 slab_unreclaimable:30262
Aug 3 23:28:01 dbhyperion kernel: mapped:997 shmem:197 pagetables:24186 bounce:0
Aug 3 23:28:01 dbhyperion kernel: Node 0 DMA free:15776kB min:24kB low:28kB high:36kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:15292kB mlocked:0kB dirty:0kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:0kB slab_unreclaimable:0kB kernel_stack:0kB pagetables:0kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no
Aug 3 23:28:01 dbhyperion kernel: lowmem_reserve[]: 0 3000 6030 6030
Aug 3 23:28:01 dbhyperion kernel: Node 0 DMA32 free:17224kB min:4936kB low:6168kB high:7404kB active_anon:112kB inactive_anon:280kB active_file:0kB inactive_file:40kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:3072160kB mlocked:0kB dirty:0kB writeback:0kB mapped:80kB shmem:80kB slab_reclaimable:752kB slab_unreclaimable:1056kB kernel_stack:216kB pagetables:21868kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:1068 all_unreclaimable? no
Aug 3 23:28:01 dbhyperion kernel: lowmem_reserve[]: 0 0 3030 3030
Aug 3 23:28:01 dbhyperion kernel: Node 0 Normal free:5688kB min:4988kB low:6232kB high:7480kB active_anon:2528kB inactive_anon:956kB active_file:0kB inactive_file:0kB unevictable:4448kB isolated(anon):0kB isolated(file):0kB present:3102720kB mlocked:4448kB dirty:0kB writeback:0kB mapped:3908kB shmem:708kB slab_reclaimable:11840kB slab_unreclaimable:119992kB kernel_stack:1904kB pagetables:74876kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no
Aug 3 23:28:01 dbhyperion kernel: lowmem_reserve[]: 0 0 0 0
Aug 3 23:28:01 dbhyperion kernel: Node 0 DMA: 4*4kB 2*8kB 2*16kB 1*32kB 3*64kB 1*128kB 0*256kB 0*512kB 1*1024kB 1*2048kB 3*4096kB = 15776kB
Aug 3 23:28:01 dbhyperion kernel: Node 0 DMA32: 267*4kB 189*8kB 120*16kB 88*32kB 58*64kB 15*128kB 1*256kB 0*512kB 0*1024kB 0*2048kB 1*4096kB = 17300kB
Aug 3 23:28:01 dbhyperion kernel: Node 0 Normal: 486*4kB 19*8kB 1*16kB 0*32kB 0*64kB 0*128kB 0*256kB 1*512kB 1*1024kB 1*2048kB 0*4096kB = 5696kB
Aug 3 23:28:01 dbhyperion kernel: 1535 total pagecache pages
Aug 3 23:28:01 dbhyperion kernel: 559 pages in swap cache
Aug 3 23:28:01 dbhyperion kernel: Swap cache stats: add 2091961, delete 2091402, find 1801378/1932333
Aug 3 23:28:01 dbhyperion kernel: Free swap = 9532516kB
Aug 3 23:28:01 dbhyperion kernel: Total swap = 11711376kB
Aug 3 23:28:01 dbhyperion kernel: 1572848 pages RAM
Aug 3 23:28:01 dbhyperion kernel: 42579 pages reserved
Aug 3 23:28:01 dbhyperion kernel: 21194 pages shared
Aug 3 23:28:01 dbhyperion kernel: 1493703 pages non-shared
Aug 3 23:28:01 dbhyperion kernel: Out of memory: kill process 7916 (perl) score 1349957 or a child
Aug 3 23:28:01 dbhyperion kernel: Killed process 7938 (java)

It looks like you are experiencing low memory exhaustion. The kernel uses low memory to track allocations of all memory. When low memory is exhausted, it doesn't matter how much high memory is available, the oom-killer will begin killing processes to keep the server alive.
I suggest you check your host and guest memory usage and allocation in VSphere, and make sure it supports your guest systems. Chances are probably that you do not have enough physical RAM to perform the tasks, or do not have enough memory allocated to your virtual machine, or have a process in your guest system that causes memory starvation because it is not configured correctly, e.g. Oracle SGA.

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faustofrancis wrote:
A Java Virtual Machine (JVM) is a set of computer software programs and data structures which use a virtual machine model for the execution of other computer programs and scripts. The model used by a JVM accepts a form of computer intermediate language commonly referred to as Java bytecode. This language conceptually represents the instruction set of a stack-oriented, capability architecture.
Java Virtual Machines operate on Java bytecode, which is normally (but not necessarily) generated from Java source code; a JVM can also be used to implement programming languages other than Java. For example, Ada source code can be compiled to Java bytecode, which may then be executed by a JVM. JVMs can also be released by other companies besides Sun (the developer of Java) -- JVMs using the "Java" trademark may be developed by other companies as long as they adhere to the JVM specification published by Sun (and related contractual obligations).
The JVM is a crucial component of the Java Platform. Because JVMs are available for many hardware and software platforms, Java can be both middleware and a platform in its own right  hence the expression "write once, run anywhere." The use of the same bytecode for all platforms allows Java to be described as "compile once, run anywhere", as opposed to "write once, compile anywhere", which describes cross-platform compiled languages. The JVM also enables such unique features as Automated Exception Handling which provides 'root-cause' debugging information for every software error (exception) independent of the source code.
The JVM is distributed along with a set of standard class libraries which implement the Java API (Application Programming Interface). The virtual machine and API have to be consistent with each other[dubious  discuss] and are therefore bundled together as the Java Runtime Environment.
Execution environment
Programs intended to run on a JVM must be compiled into a standardized portable binary format, which typically comes in the form of .class files. A program may consist of many classes in different files. For easier distribution of large programs, multiple class files may be packaged together in a .jar file (short for Java archive).
The JVM runtime executes .class or .jar files, emulating the JVM instruction set by interpreting it, or using a just-in-time compiler (JIT) such as Sun's HotSpot. JIT compiling, not interpreting, is used in most JVMs today to achieve greater speed. Ahead-of-time compilers that enable the developer to precompile class files into native code for a particular platform also exist.
Like most virtual machines, the Java Virtual Machine has a stack-based architecture.
Although the JVM was primarily aimed at running compiled Java programs, other languages can now run on top of it[1], such as:
* Ruby, with JRuby
* JavaScript, with Rhino
* Python, with Jython
* Common Lisp, with Armed Bear Common Lisp
* Groovy
* Scala
[edit] Bytecode verifier
A basic philosophy of Java is that it is inherently "safe" from the standpoint that no user program can "crash" the host machine or otherwise interfere inappropriately with other operations on the host machine, and that it is possible to protect certain functions and data structures belonging to "trusted" code from access or corruption by "untrusted" code executing within the same JVM. Furthermore, common programmer errors that often lead to data corruption or unpredictable behavior such as accessing off the end of an array or using an uninitialized pointer are not allowed to occur. Several features of Java combine to provide this safety, including the class model, the garbage-collected heap, and the verifier.
The JVM verifies all bytecode before it is executed. This verification consists primarily of three types of checks:
* Branches are always to valid locations
* Data is always initialized and references are always type-safe
* Access to "private" or "package private" data and methods is rigidly controlled.
The first two of these checks take place primarily during the "verification" step which occurs when a class is loaded and made eligible for use. The third is primarily performed dynamically, when data items or methods of a class are first accessed by another class.
The verifier permits only some bytecode sequences in valid programs, e.g. a jump (branch) instruction can only target an instruction within the same function or method. Because of this, the fact that JVM is a stack architecture does not imply a speed penalty for emulation on register-based architectures when using a JIT compiler. In the face of the code-verified JVM architecture, it makes no difference to a JIT compiler whether it gets named imaginary registers or imaginary stack positions that need to be allocated to the target architecture's registers. In fact, code verification makes the JVM different from a classic stack architecture whose efficient emulation with a JIT compiler is more complicated and typically carried out by a slower interpreter.
Code verification also ensures that arbitrary bit patterns cannot get used as an address. Memory protection is achieved without the need for a MMU. Thus, JVM is an efficient way of getting memory protection on simple architectures that lack an MMU. This is analogous to managed code in Microsoft's .NET CLR, and conceptually similar to capability architectures such as the Plessey 250, and IBM System/38.
[edit] Bytecode instructions
Main article: Java bytecode
The JVM has instructions for the following groups of tasks:
* Load and store
* Arithmetic
* Type conversion
* Object creation and manipulation
* Operand stack management (push / pop)
* Control transfer (branching)
* Method invocation and return
* Throwing exceptions
* Monitor-based concurrency
The aim is binary compatibility. Each particular host operating system needs its own implementation of the JVM and runtime. These JVMs interpret the byte code semantically the same way, but the actual implementation may be different. More complicated than just the emulation of bytecode is compatible and efficient implementation of the Java core API which has to be mapped to each host operating system.
[edit] Secure execution of remote code
A virtual machine architecture allows very fine-grained control over the actions that code within the machine is permitted to take. This is designed to allow safe execution of untrusted code from remote sources, a model used by Java applets. Applets run within a VM incorporated into a user's browser, executing code downloaded from a remote HTTP server. The remote code runs in a restricted "sandbox", which is designed to protect the user from misbehaving or malicious code. Publishers can purchase a certificate with which to digitally sign applets as "safe", giving them permission to ask the user to break out of the sandbox and access the local file system and network...
[edit] C to bytecode compilers
From the point of view of a compiler Java bytecode is just another processor with an instruction set for which code can be generated. The JVM was originally designed to execute programs written in the Java language. However, the JVM provides an execution environment in the form of a bytecode instruction set and a runtime system that is general enough that it can be used as the target for compilers of other languages.
Because of its close association with Java the JVM performs the runtime checks mandated by the Java specification. This can make it technically difficult to translate C code (which is much more lax with regard to runtime checking) to the JVM and expect it to run without issuing any warnings.
Compilers targeting many different languages, including Ada and COBOL, have been written.
[edit] Licensing
Starting with J2SE 5.0, changes to the JVM specification have been developed under the Java Community Process as JSR 924[2]. As of 2006, changes to specification to support changes proposed to the class file format (JSR 202[3]) are being done as a maintenance release of JSR 924. The specification for the JVM is published in book form,[4] known as "blue book". The preface states:
We intend that this specification should sufficiently document the Java Virtual Machine to make possible compatible clean-room implementations. Sun provides tests which verify the proper operation of implementations of the Java Virtual Machine.
Sun's JVM is called HotSpot. Clean-room Java implementations include Kaffe and IBM J9. Sun retains control over the Java trademark, which it uses to certify implementation suites as fully compatible with Sun's specification.
[edit] See also
* HotSpot, Sun's Virtual Machine
* Da Vinci Machine, a starting Sun project aiming to prototype the extension of the JVM to add support for dynamic languages.
* List of Java virtual machines
* Automated Exception Handling
* Common Language Runtime
* Parrot virtual machine
* Java bytecode
* Class (file format)
* Java performance
* List of compilers
[edit] Notes
1. ^ Tolksdorf, Robert (2005). Languages for the Java VM. Retrieved on 2008-04-23.
2. ^ JSR 924  Specifies changes to the JVM specification starting with J2SE 5.0
3. ^ JSR 202  Specifies a number of changes to the class file format
4. ^ The Java Virtual Machine Specification (the first and second editions are also available online)
[edit] References
* Clarifications and Amendments to the Java Virtual Machine Specification, Second Edition includes list of changes to be made to support J2SE 5.0 and JSR 45
* JSR 45  Specifies changes to the class file format to support source-level debugging of languages such as JSP and SQLJ that are translated to Java
[edit] External links
* The Java Virtual Machine Specification
* Java-Virtual-Machine.net - All about Java Virtual Machines!
* List of languages which compile to the Java virtual machine.
* A decade after Java arrived, there have been improvements in the runtime performance of platform-independent virtual-machine based software.
* Kaffe.org - the Kaffe project
* JamVM - The Jam Virtual Machine
* The lean, mean, virtual machine - An introduction to the basic structure and functionality of the Java Virtual Machine
* Java Glossary - installing Java useful tips for installing Java for users and developers
* Test your Java Virtual Machine
* A list of Java VM-s used in mobile devices
* More Languages for the JVM
* Sun to build virtual machine for iPhone - ComputerWorldAre you aware that Wikipedia has ripped off your post?not yet?
Let me see if the systems work!

Can I install Linux and then use the original Windows 8 OEM product key for a virtual machine on the same computer?

I have ordered a new laptop and expect to receive it in 2-3 weeks. The laptop comes with an OEM version of Windows 8 installed. I wish
to install Linux as the host operating system and create a virtual machine running Windows 8. Can I legally use the product key from the OEM installation to activate a virtual machine that will only be used on the laptop that had the original OEM installation?
If so, what is the procedure to activate the copy installed on the virtual machine?
This question has been addressed for Windows 7, but my searches did not reveal this question posed for Windows 8.

Technically, no. The OEM is licensed only for the physical hardware on the system. It isn't licensed for virtual hardware.
You may find you're unable to activate your OEM license in the VM. A lot of OEM Windows look for specific hardware to verify they're being installed on the correct hardware.
Although here: http://www.microsoft.com/oem/en/Pages/support-faq.aspx#fbid=Zh0SiBdas5I
Q. Can I install OEM on a virtual machine (VMware)?
A. You may install OEM in a virtual environment as long as you have a separate license for each instance of the software. It is fine to use the OEM version as long as it is properly licensed. To be clear, a separate version of software must be installed
for both the “standard” and “virtual” installations.
You still may not be able to activate if there is a hardware block.
The best place to ask this is to Microsoft licensing, any response you get here, including mine, won't hold up since it's not an official answer.
Q. Can I install OEM on a virtual machine (VMware)?
A. You may install OEM in a virtual environment as long as you have a separate license for each instance of the software. It is fine to use the OEM version
as long as it is properly licensed. To be clear, a separate version of software must be installed for both the “standard” and “virtual” installations.
edit: removed the duplicate Q&A

Not able to connect Azure Linux Virtual Machine with Putty

Hi,
I am not bale to connect Azure Linux Virtual Machine with Putty... Error shows "Network error: connection timed out".
Please help.
Thanks,
Techsol
Thanks, Kk

Hi TechSol01,
Thanks for posting here.
I suggest you to try the below steps
On a computer running a Windows operating system, you might want to use an SSH client such as PuTTY. For more information, see the
PuTTY Download Page.
On a computer running a Linux operating system, you might want to use an SSH client such as OpenSSH. For more information, see
OpenSSH.
If it is the endpoint configuration, you can go to the portal and add port 22, (it should already be there by default).
Now if it is locked out of the VM because of the firewall on the VM, which is called iptables , You won't be able to connect to the VM,
If you haven’t configured the port 22. You may have to follow the below steps :
A = Original VM (Inaccessible VM)
B = New VM (New Temp VM)
1) Stop VM A via the Azure management portal
2) Delete VM A BUT select “keep the attached disks”
3) Once the lease is cleared, attach the Data Disk from A to VM B via the Azure Portal, Virtual Machines, Select “B”, Attach Disk
4) On VM “B” eventually the disk will attach and you can then mount it.
5) Locate the drive name to mount, on VM “B” look in relevant log file note each linux is slightly different.
grep SCSI /var/log/kern.log (ubuntu)
grep SCSI /var/log/messages (centos, suse, oracle)
6) Mount the attached disk onto mountpoint /tempmount
df -h
mkdir /tempmount
mount /dev/sdc1 /tempmount
df –h
7) Now you should be able to clear the rules set from the configuration file of the firewall, by accessing it
through /tempmount
Let me know if this works
Girish Prajwal

Installing Oracle Apps on Linux Virtual Machine, but need patch "6078836"

Hello Friend's,
Hope you are doing well...!
I start my EBS Training in a functional role in less than 10 day's.
My dilemma is that i am having a heck of a time installing Oracle Apps on my machine. As recommended in many blogs, i've installed a virtual machine environment and then installed Linux Version 5 Update 5. Before i begins installing Oracle apps, the last step is to go to my oracle support "mos" and install patch 6078836, which i can't access. It seems to me as if that one should either have a paid oracle support account or be a part of an organization/company that has one. I can't get past the sign in page to install this patch and no where in these blogs does it say this.
Does anyone have this patch or has access to it or any knowledge or idea as to where can i find this?
As a back up i've started downloading Oracle apps for a windows server machine as well, in case i am unable to download this patch at least i have a back up. And the bad thing about this is the fact that i am in India and the bandwidth here sucks even with a 2 MB plan. With these speeds this 50 GB download will take another 3 to 4 days. And time is of the utmost importance for me right now..
Any help or suggestions will be much appreciated..
Thank you all in advance and hope that you have a great weekend..!

Does anyone have this patch or has access to it or any knowledge or idea as to where can i find this?Even though any of us has the patch we are not supposed to mail it as this violates Oracle support agreement policy.
There is no other source to get the patch and most Oracle patches (if not all) can be downloaded from MOS website.
As a back up i've started downloading Oracle apps for a windows server machine as well, in case i am unable to download this patch at least i have a back up. And the bad thing about this is the fact that i am in India and the bandwidth here sucks even with a 2 MB plan. With these speeds this 50 GB download will take another 3 to 4 days. And time is of the utmost importance for me right now..
Any help or suggestions will be much appreciated..We cannot suggest anything about the download speed or the timing, and even if you had a CSI number it would take 3-5 days to get the Media Pack in case you log a SR and ask Oracle support to send you the pack.
Thanks,
Hussein

Oracle Linux 6 installation FAILURE on VMWare virtual machine

I just downloaded OEL 6.0 x64, created a new VMWare virtual machine (I have many VMWare VMs running various flavors of OEL 5) and did an installation. It all seemed to work fine. I was just testing, so I didn't do any customization. It finished, and looked good, just like all the other ones I've done. I clicked "reboot", and it did. Or it tried to.
It did boot from the disk, but after about 15 seconds, it said:
No root device found
Boot has failed, sleeping forever.
I retried the installation using a fresh VM, and even let the installer check the whole DVD first. Same result.
Anyone installed OEL 6 to a virtual machine on VMWare ESX?
Any idea what the heck could be wrong?

The problem is:
The Red Hat compatible kernel includes the vmw_pvscsi driver whereas Unbreakable Enterprise Kernel doesn’t. The kernel that the installer boots first does have the drivers, which is why everything is set up fine until UEK tries to find the root volume. It's an issue we plan to address in an updated kernel.
For now the workaround is:
When creating a new VM in VSphere, do not pick Red Hat Enterprise Linux 6 x86-64 as the OS type but use Oracle Linux 5 x86-64 (or Red Hat Enterprise Linux 5). ESX will then expose the LSI logic scsi controller to the OS and the 2.6.32-100.28.* kernel will work.
Sergio

Activation based license not recognized by Virtual Machine (Vivado 2014.4)

Hi,
I am using an VirtualBox to host a Ubuntu 64-bit Linux machine. And I have a Vivado node-locked license. In the first time, when I tried to generate license and used it with the machine, everything went well. But then I returned the license back to Xilinx, so that I can generate the license again for any other machine.
Then, the time comes to me that I need to use my Linux VM again. After generating the "Xilinx_license.xml" file via the Xilinx licensing website, the VLM refuses the license with the message:
Then I tried using command prompt to process the license, but I got the foolowing output:
di@di-VirtualBox:~$ xlicclientmgr -p ~/Downloads/Xilinx_License.xml
ERROR: API function 60009 failed, result 51308
Request generated on a different machine
Response processing failed.
The response is not valid for this machine.
Exit(4) error when processing response.
So I am now stuck in a state that I have a license generated, but I cannot use it, and I also cannot return it back to Xilinx. I need some help from Xilixn technical support.
A list of my questions:
- what did I do wrong so that such an error occurs? ( I was able to use my VM and Vivado without any problem for the first time)
- how to make VLM recognize this license again?
- is there anyway to get myself out of the stuck-with-the-license state?
Many thanks in advance.
Regards,
Di Cao

Hi ,
The Virtual Machine has never been removed or changed.
I merely returned the Xilinx license that was once assigned to this Virtual Machine some days ago, and today I tried to generate a license again for the same Virtual Machine.
Somehow the VLM does not recognize the license.xml at all, and I am now stuck with this license that can neither be recognized nor be returned.
Is it possible to un-do the current generated license and allow the Xilinx licensing site to generate a new license again?
Regards,
Di

Networking arch linux virtual machine networking

For a project, I've got an arch linux virtual machine running on the school network. The image has SSH installed and that works just fine, the problem is that the network admin didn't give it access to the internet (so I can access it only over lan). What I would like to do is run updates on it and install several libraries that I need for deploying a web application (rails). The easy way to install them is obviously through pacman, which leads me to my question: Is there a way to make a network interface on the server that would use ssh to make a bridged connection to the internet?
Not super sure if I worded that correctly, but it seems that it ought to be possible to have a network interface on the vm that, when the vm opens an ssh connection to some ssh server (on the lan) allows the vm to use that connection for more than just ssh.
Thanks.

I was making this too complicated... I set up a squid proxy on a different machine and it all works well.

Oracle Database 10g on Red Hat Linux Virtual Machine download location?

anyone know where i can download the vmware image of redhat and oracle preinstalled?
its called "Oracle Database 10g on Red Hat Linux Virtual Machine"
i found a reference to it on this page, but the link at the bottom is broken.
http://www.oracle.com/technology/obe/10gr2_db_vmware/htmlfiles/readme_oracleonlnxeval.html
i want to test out oracle on redhat before i install it completely

Please don't cross post on many forums,
check where can i download a vmware image of redhat and oracle preinstalled?

Creating a Linux virtual machine on dynamic vhdx file creates huge file on formating

Hello,
we just created a virtual machine on Windows Server 2012 R2 on a dynamic vhdx file.
When the operating system (Redhat 5) formats the filesystem (100GB of size), then the vhdx file expands to 21 GB, although no data is written to the disk.
Did someone experience a similar issue? And how to avoid such space waste. If we write additional data in the virtual machine, then the vhdx expands again and gets even bigger then the 21 GB.
Thanks,
Thomas

~~
The RedHat 6.5 is not supported guest system,
~
RHEL 6.5 in VM on Hyper-V is even _certified_ solution
~
P.S. About .vhdx itself and BlockSizeBytes 1MB ( 32Mb as default ) see next message
P.P.S.
~ ~
"So RedHat itself supports the virtual machine, but Microsoft not?"
Depends upon how you define the word 'support'. Microsoft has never supported any Linux operating system in the manner that it supports software it has written. In this case, support means providing fixes to the software code. That is pretty
standard across the board. RedHat does not support Microsoft applications or software, either.
However, if you mean the Microsoft supports the running of the RedHat operating system within Hyper-V, the answer is yes. In those cases where it is not obvious that a problem is occurring in Microsoft's integration components, it will work with RedHat
to determine where the error lies. If the cooperative effort between Microsoft and RedHat determines the problem is with Microsoft code, Microsoft will fix (support) it. If it is determined that the problem is not with Microsoft code, RedHat will
make the determination as to whether or not to fix (support) it.
.:|:.:|:. tim
~ ~
https://www.redhat.com/promo/svvp/
==
Red Hat Enterprise Linux and Microsoft Windows Virtualization Interoperability
In February 2009 Red Hat and Microsoft signed reciprocal agreements
to enable cross-certification of the companies' virtualization
platforms. . . . . As a result, customers are able to
deploy heterogeneous virtualization environments comprising Microsoft
Windows and Red Hat Enterprise Linux with full technical support
available from both companies.
The completed certifications include:
Certification of Windows Server 2008 Hyper-V, Microsoft Hyper-V
Server 2008, Windows Server 2008 R2 Hyper-V and Microsoft Hyper-V Server
2008 R2 host with Red Hat Enterprise Linux 5.2, 5.3, and 5.4 guests.
Customers with valid support agreements receive cooperative technical support for:
. . . , and
running Red Hat Enterprise Linux virtualized on Windows Server 2008 Hyper-V.
==
Hyper-V Supported Virtual Machines and Guest Operating Systems
==
Supported guest operating systems
Server guest operating system (Linux) on Hyper-V in Windows Server 2008 R2
Editions
Virtual processors
CentOS 5.5-5.9
x86 edition and x64 edition
1, 2, 3, or 4
CentOS 6.0-6.4
x86 edition and x64 edition
1, 2, 3, or 4
Red Hat Enterprise Linux 5.5-5.8
x86 edition and x64 edition
1, 2, 3, or 4
Red Hat Enterprise Linux 5.9
Red Hat certified.
x86 edition and x64 edition
1, 2, 3, or 4
Red Hat Enterprise Linux 6.0-6.3.
x86 edition and x64 edition
1, 2, 3, or 4
Red Hat Enterprise Linux 6.4
Red Hat certified.
x86 edition and x64 edition
1, 2, 3, or 4
SUSE Linux Enterprise Server 10 with Service Pack 4
x86 edition and x64 edition
1, 2, 3, or 4
SUSE Linux Enterprise Server 11 with Service Pack 1, Service Pack 2 or Service Pack 3
x86 edition and x64 edition
1, 2, 3, or 4
Ubuntu 12.04 and 12.10
x86 edition and x64 edition
1, 2, 3, or 4
Ubuntu 13.04 and 13.10
x86 edition and x64 edition
1, 2, 3, or 4
Oracle Linux 6.4
Note
Oracle Linux is only supported when running the Red Hat Compatible Kernel.
x86 edition and x64 edition
1, 2, 3, or 4
==
+
==
CentOS 5.7 – 5.8
Drivers: IDE, SCSI, and networking
Services: Time synchronization, operating system shutdown, and heartbeat
Integration services are distributed through a download available at
http://www.microsoft.com/en-us/download/details.aspx?id=34603
CentOS 5.9
Drivers: IDE, SCSI, networking, and mouse
Services: Time synchronization, operating system shutdown, and heartbeat
Integration services are built-in and do not require a separate download and installation.
CentOS 6.0 - 6.3
Drivers: IDE, SCSI, networking, and mouse
Services: Time synchronization, operating system shutdown, and heartbeat
Integration services are distributed through a download available at
http://www.microsoft.com/en-us/download/details.aspx?id=34603
CentOS 6.4
Drivers: IDE, SCSI, networking, and mouse
Services: Time synchronization, operating system shutdown, and heartbeat
Integration services are built-in and do not require a separate download and installation.
Red Hat Enterprise Linux 5.7- 5.8
Drivers: IDE, SCSI, and networking
Services: Time synchronization, operating system shutdown, and heartbeat
Integration services are distributed through a download available at
http://www.microsoft.com/en-us/download/details.aspx?id=34603
Red Hat Enterprise Linux 5.9
Red Hat certified
Drivers: IDE, SCSI, networking, and mouse
Services: Time synchronization, operating system shutdown, and heartbeat
Integration services are built-in and do not require a separate download and installation.
Red Hat Enterprise Linux 6.0 – 6.3
Drivers: IDE, SCSI, networking, and mouse
Services: Time synchronization, operating system shutdown, and heartbeat
Integration services are distributed through a download available at
http://www.microsoft.com/en-us/download/details.aspx?id=34603
Red Hat Enterprise Linux 6.4
Red Hat certified
Drivers: IDE, SCSI, networking, and mouse
Services: Time synchronization, operating system shutdown, and heartbeat
Integration services are built-in and do not require a separate download and installation.
SUSE Linux Enterprise Server 11 with Service Pack 2 and Service Pack 3
Drivers: IDE, SCSI, networking, and mouse
Services: Time synchronization, operating system shutdown, and heartbeat
Integration services are built-in and do not require a separate download and installation.
Open SUSE 12.1
Drivers: IDE, SCSI, networking, and mouse
Services: Time synchronization, operating system shutdown, and heartbeat
Integration services are built-in and do not require a separate download and installation.
Ubuntu 12.04 and 12.10
Drivers: IDE, SCSI, networking, and mouse
Services: Time synchronization, operating system shutdown, and heartbeat
Integration services are built-in and do not require a separate download and installation.
Ubuntu 13.04 and 13.10
Drivers: IDE, SCSI, networking, and mouse
Services: Time synchronization, operating system shutdown, and heartbeat
Integration services are built-in and do not require a separate download and installation.
Oracle Linux 6.4
Drivers: IDE, SCSI, networking, and mouse
Services: Time synchronization, operating system shutdown, and heartbeat
Integration services are built-in and do not require a separate download and installation.
Note
Oracle Linux is only supported when running the Red Hat Compatible Kernel.
==

How is the performance of Mac Pro if i use it as host for windows and linux virtual machines.

How is the performance of Mac Pro if i use it as host for windows and linux virtual machines.
I am planning to buy a high performance PC to run my Windows and Linux servers as vitrual machines for my testing purposes.
Initially i planned to build my own computer with recommended configurations but considering space constaints and cooling factors i think Mac Pro can be a choice. But need some inputs if Mac pro (Intel Xeon E5, 12 GB RAM) is good for running virtual Machines.

You could even run Windows natively and still run your VM servers.
I have seen reports and such on MacRumors and elsewhere - run Windows natively as well as VMs (can also do testing and run Mavericks in a VM under Mavericks)
The fast internal PCIe-SSD, plus 6 or 8 cores, and 32-64GB RAM. Of course for $5,000 for 8-core, some Thunderbolt storage and 32GB/64GB RAM you can buy some serious hardware.

Dadenie virtual machine based on Linux 5.7

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