Maximum Large Pages

Hi
I have RHEL 6.4 with 128GB RAM
I have big database
The database is the only service on this box.
what is the optimal number of large pages I can have in the box ?
(to not disturb the OS )
Tanks for your help

> I have RHEL 6.4 with 128GB RAM
> I have big database
> The database is the only service on this box.
> what is the optimal number of large pages I can have in the box ?
Depends what you want.
Based on the information you have supplied, I would recommend a HugePages value between 0 GB and 127 GB.
How large is your application?
What kind of application is it?
What is the locality in its data access? Sequential? Random?
How long should any cached data be kept in memory just in case it is needed again?
How much data does the application need to read and write?
The DB install guide has some recommendations on calculating the size of the shared global area (SGA); use them.
Do not enable Automatic Memory Management (AMM) because AMM is just a poor-man's HugePages.
Does your DB use many table joins? Few joins but lots and lots of data rows?
Remember your SGA must fit entirely within the HugePages area else you will get massively-degraded performance.
I have RHEL 6.4 with 128GB RAM
I have big database
The database is the only service on this box.
what is the optimal number of large pages I can have in the box ?

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Last edited by __void__ (2009-01-21 16:34:47)

__void__ wrote:
When you're trying to edit a large page on the wiki you get this message:
WARNING: This page is 40 kilobytes long; some browsers may have problems editing pages approaching or longer than 32kb. Please consider breaking the page into smaller sections.
Firefox can handle the 40kb but not the 107kb of the Begginers Guide for example.
And when you do a change, if you dont preview it you get a shiny blank page instead of the document.
I was trying to add one line to the Oficcial installation guide and ended up breaking it into two parts (i move the apendix to another page) to be able to recover it's contents.
Some other person form #archlinux that was helping me with this issue also accidentally override the text from the Beginners guide, and we can't roll back it. So, any WikiAdmin can roll back the changes on the Beginners guide? and tell us (the normal users) how to edit long pages.
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Some other person here, sorry about that accidental Beginner's guide trash up
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Got it!
Last edited by zaggynl (2009-01-22 09:35:03)

Large page sizes on Solaris 9

I am trying (and failing) to utilize large page sizes on a Solaris 9 machine.
# uname -a
SunOS machinename.lucent.com 5.9 Generic_112233-11 sun4u sparc SUNW,Sun-Blade-1000
I am using as my reference "Supporting Multiple Page Sizes in the Solaris� Operating System" http://www.sun.com/blueprints/0304/817-6242.pdf
and
"Taming Your Emu to Improve Application Performance (February 2004)"
http://www.sun.com/blueprints/0204/817-5489.pdf
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# pagesize -a
8192
65536
524288
4194304
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main()
int sz = 10*1024*1024;
int x = (int)malloc(sz);
print_info((void**)&x, 1);
while (1) {
int i = 0;
while (i < (sz/sizeof(int))) {
x[i++]++;
I run it specifying a 4M heap size:
# ppgsz -o heap=4M ./malloc_and_sleep
address 0x21260 is backed by physical page 0x300f5260 of size 8192
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pmap -sx `pgrep malloc` | more
10394: ./malloc_and_sleep
Address Kbytes RSS Anon Locked Pgsz Mode Mapped File
00010000 8 8 - - 8K r-x-- malloc_and_sleep
00020000 8 8 8 - 8K rwx-- malloc_and_sleep
00022000 3960 3960 3960 - 8K rwx-- [ heap ]
00400000 6288 6288 6288 - 8K rwx-- [ heap ]
(The last 2 lines above show about 10M of heap, with a pgsz of 8K.)
I'm running this as root.
In addition to the ppgsz approach, I have also tried using memcntl and mmap'ing ANON memory (and others). Memcntl gives an error for 2MB page sizes, but reports success with a 4MB page size - but still, pmap reports the memcntl'd memory as using an 8K page size.
Here's the output from sysinfo:
General Information
Host Name is machinename.lucent.com
Host Aliases is loghost
Host Address(es) is xxxxxxxx
Host ID is xxxxxxxxx
/opt/default/bin/sysinfo: /dev/ksyms is not a 32-bit kernel namelist
Manufacturer is Sun (Sun Microsystems)
/opt/default/bin/sysinfo: /dev/ksyms is not a 32-bit kernel namelist
/opt/default/bin/sysinfo: /dev/ksyms is not a 32-bit kernel namelist
System Model is Blade 1000
/opt/default/bin/sysinfo: /dev/ksyms is not a 32-bit kernel namelist
ROM Version is OBP 4.10.11 2003/09/25 11:53
Number of CPUs is 2
CPU Type is sparc
App Architecture is sparc
Kernel Architecture is sun4u
OS Name is SunOS
OS Version is 5.9
Kernel Version is SunOS Release 5.9 Version Generic_112233-11 [UNIX(R) System V Release 4.0]
/opt/default/bin/sysinfo: /dev/ksyms is not a 32-bit kernel namelist
Kernel Information
/opt/default/bin/sysinfo: /dev/ksyms is not a 32-bit kernel namelist
SysConf Information
Max combined size of argv[] and envp[] is 1048320
Max processes allowed to any UID is 29995
Clock ticks per second is 100
Max simultaneous groups per user is 16
Max open files per process is 256
System memory page size is 8192
Job control supported is TRUE
Savid ids (seteuid()) supported is TRUE
Version of POSIX.1 standard supported is 199506
Version of the X/Open standard supported is 3
Max log name is 8
Max password length is 8
Number of processors (CPUs) configured is 2
Number of processors (CPUs) online is 2
Total number of pages of physical memory is 262144
Number of pages of physical memory not currently in use is 4368
Max number of I/O operations in single list I/O call is 4096
Max amount a process can decrease its async I/O priority level is 0
Max number of timer expiration overruns is 2147483647
Max number of open message queue descriptors per process is 32
Max number of message priorities supported is 32
Max number of realtime signals is 8
Max number of semaphores per process is 2147483647
Max value a semaphore may have is 2147483647
Max number of queued signals per process is 32
Max number of timers per process is 32
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Supports File Synchronization is TRUE
Supports memory mapped files is TRUE
Supports process memory locking is TRUE
Supports range memory locking is TRUE
Supports memory protection is TRUE
Supports message passing is TRUE
Supports process scheduling is TRUE
Supports realtime signals is TRUE
Supports semaphores is TRUE
Supports shared memory objects is TRUE
Supports syncronized I/O is TRUE
Supports timers is TRUE
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Device Information
SUNW,Sun-Blade-1000
cpu0 is a "900 MHz SUNW,UltraSPARC-III+" CPU
cpu1 is a "900 MHz SUNW,UltraSPARC-III+" CPU
Does anyone have any idea as to what the problem might be?
Thanks in advance.
Mike

I ran your program on Solaris 10 (yet to be released) and it works.
Address Kbytes RSS Anon Locked Pgsz Mode Mapped File
00010000 8 8 - - 8K r-x-- mm
00020000 8 8 8 - 8K rwx-- mm
00022000 3960 3960 3960 - 8K rwx-- [ heap ]
00400000 8192 8192 8192 - 4M rwx-- [ heap ]
I think you don't this patch for Solaris 9
i386 114433-03
sparc 113471-04
Let me know if you encounter problem even after installing this patch.
Saurabh Mishra

How do i convert several large pages files to pdf?

how do i convert several large pages files to pdf?

Hello:
Open Pages. Go to the menu bar>file>export. Select PDF. The size of the file should be irrelevant.
Barry

Total Shared Global Region in Large Pages = 0 KB (0%)

Hi ,
Am working on Oracle Database 11.2.0.3 ,
Application 12.1.3.
i see this message in the alert log file :
****************** Large Pages Information *****************
Total Shared Global Region in Large Pages = 0 KB (0%)
Large Pages used by this instance: 0 (0 KB)
Large Pages unused system wide = 0 (0 KB) (alloc incr 32 MB)
Large Pages configured system wide = 0 (0 KB)
Large Page size = 2048 KB
RECOMMENDATION:
Total Shared Global Region size is 12 GB. For optimal performance,
prior to the next instance restart increase the number
of unused Large Pages by atleast 6145 2048 KB Large Pages (12 GB)
system wide to get 100% of the Shared
Global Region allocated with Large pages
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Thanks

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Hello,
I�ve some problems to use large pages ( 16k, 512k, 4M ) on two Primepower650 systems. I�ve installed the most actual kernel 127111-05.
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<----------------
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You don't run a scalability option on a basically unscabable O/S like Winblows, do you?
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Report sent to Apple Bugs Hunters:
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Hi,
i'm trying to convince oracle to use large pages on AIX 5.3 but haven't
suceeded so far.
i set v_pinshm=1, maxpin%=80, lgpg_regions=448 and lgpg_size=16777216
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