Only one CPU core recognized [solved]

For some reason the kernel only recognizes one CPU core out of two. I'm not completely sure at which kernel upgrade it disappeared but it is gone in 2.6.36 and 2.6.37. I know it was still there in september 2010 and earlier. I'm using a x86-64 kernel.
cat /proc/cpuinfo:
processor : 0
vendor_id : AuthenticAMD
cpu family : 16
model : 6
model name : AMD Athlon(tm) II X2 245 Processor
stepping : 2
cpu MHz : 2913.253
cache size : 1024 KB
fpu : yes
fpu_exception : yes
cpuid level : 5
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm 3dnowext 3dnow constant_tsc up rep_good nopl nonstop_tsc extd_apicid pni monitor cx16 popcnt lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt npt lbrv svm_lock nrip_save
bogomips : 5828.27
TLB size : 1024 4K pages
clflush size : 64
cache_alignment : 64
address sizes : 48 bits physical, 48 bits virtual
power management: ts ttp tm stc 100mhzsteps hwpstate
Motherboard is: Gigabyte MA770T-UD3P. I use the latest bios.
I have tried adding the kernel options "acpi=off noacpi apic=off noapic" as to the suggestion of a ubuntu bug report in launchpad but it didn't help. I also disabled ACPI in the bios but I'm still limited to one cpu core.
Any ideas?
[SOLVED]
I just doublechecked the BIOS settings and it had the CPU Core Control set to manual and one core was disabled. I set it to auto again and now both cores are recognized correctly. I don't recall ever touching this setting but at least it works now. Maybe a bios update actually changed the setting or (more probable) a friend of mine.
Last edited by Baraclese (2011-01-17 19:01:02)

JOhnLiu wrote:
thanks for reply sb92075
[root@localhost ~]# mpstat -P ALL 2
Linux 2.6.18-164.el5 (localhost.localdomain)    09/12/12
09:29:09     CPU   %user   %nice    %sys %iowait    %irq   %soft %steal   %idle    intr/s
09:29:11     all    0.01    0.00    1.27    0.01    0.00    0.01    0.00   98.69   1658.29
09:29:11       0    0.50    0.00    0.00    0.00    0.00    0.50    0.00   98.99   1657.29
09:29:11      73    0.00    0.00    0.00    0.00    0.00    0.00    0.00 100.00      0.00
09:29:11      74    0.00    0.00 100.00    0.00    0.00    0.00    0.00    0.00      0.00
09:29:11      75    0.00    0.00    0.00    0.00    0.00    0.00    0.00 100.00      0.00
09:29:11      76    0.00    0.00    0.00    0.00    0.00    0.00    0.00 100.00      0.00I think you don't understand what i mean .
there just have ONLY ONE CORE %sys 100
the top command show average of all cpu core sys% usage
when the one core sys% is 100%
the system are very slow .
e.g: when I create a database instance used for a long time . over 2 hours
but generally it will be done at most 1 hours or shorteris any type of OS virtualization involved in this environment?

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Only one CPU core high sys usage when create database instance via dbca

when using dbca to create database instance
JUST ONLY ONE CPU core high sys usage
how to troubleshoot it
see this:
top - 09:28:19 up 55 days, 20:38, 10 users, load average: 1.00, 1.08, 1.31
Tasks: 1231 total,   2 running, 1228 sleeping,   0 stopped,   1 zombie
Cpu(s): 0.0%us, 1.3%sy, 0.0%ni, 98.7%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 57588328k total, 55028620k used, 2559708k free,   196852k buffers
Swap: 16386292k total,    23156k used, 16363136k free, 23011232k cached
PID USER      PR NI VIRT RES SHR S %CPU %MEM    TIME+ COMMAND
11343 oracle    25   0 1771m 30m 23m R 99.7 0.1   5:36.39 oracle
3692 oracle    16   0 13948 2348 816 S 1.6 0.0 17:00.94 top
11432 root      15   0 13540 2024 820 R 1.3 0.0   0:00.21 top
11034 oracle    16   0 737m 171m 33m S 0.3 0.3   0:52.39 java
11435 oracle    15   0 66056 1596 1180 S 0.3 0.0   0:00.01 bash
    1 root      15   0   784 172 160 S 0.0 0.0 38:56.76 init
    2 root      RT -5     0    0    0 S 0.0 0.0   0:00.58 migration/0
    3 root      34 19     0    0    0 S 0.0 0.0   0:00.75 ksoftirqd/0
    4 root      RT -5     0    0    0 S 0.0 0.0   0:00.00 watchdog/0
    5 root      RT -5     0    0    0 S 0.0 0.0   0:00.81 migration/1
    6 root      34 19     0    0    0 S 0.0 0.0   0:00.00 ksoftirqd/1
    7 root      RT -5     0    0    0 S 0.0 0.0   0:00.00 watchdog/1
    8 root      RT -5     0    0    0 S 0.0 0.0   0:02.53 migration/2    mpstat info
[root@localhost ~]# mpstat -P ALL 2
Linux 2.6.18-164.el5 (localhost.localdomain)    09/12/12
09:29:09     CPU   %user   %nice    %sys %iowait    %irq   %soft %steal   %idle    intr/s
09:29:11     all    0.01    0.00    1.27    0.01    0.00    0.01    0.00   98.69   1658.29
09:29:11       0    0.50    0.00    0.00    0.00    0.00    0.50    0.00   98.99   1657.29
09:29:11      73    0.00    0.00    0.00    0.00    0.00    0.00    0.00 100.00      0.00
09:29:11      74    0.00    0.00 100.00    0.00    0.00    0.00    0.00    0.00      0.00
09:29:11      75    0.00    0.00    0.00    0.00    0.00    0.00    0.00 100.00      0.00
09:29:11      76    0.00    0.00    0.00    0.00    0.00    0.00    0.00 100.00      0.00
09:29:11      77    0.00    0.00    0.00    0.00    0.00    0.00    0.00 100.00      0.00
09:29:11      78    0.00    0.00    0.00    0.00    0.00    0.00    0.00 100.00      0.00
09:29:11      79    0.00    0.00    0.00    0.00    0.00    0.00    0.00 100.00      0.00
09:29:11     CPU   %user   %nice    %sys %iowait    %irq   %soft %steal   %idle    intr/s
09:29:13     all    0.01    0.00    1.26    0.01    0.00    0.02    0.00   98.70   1761.19
09:29:13       0    0.50    0.00    0.50    1.00    0.00    1.99    0.00   96.02   1761.19
09:29:13      71    0.00    0.00    0.00    0.00    0.00    0.00    0.00 100.00      0.00
09:29:13      72    0.00    0.00    0.00    0.00    0.00    0.00    0.00 100.00      0.00
09:29:13      73    0.00    0.00    0.00    0.00    0.00    0.00    0.00 100.00      0.00
09:29:13      74    0.00    0.00 100.00    0.00    0.00    0.00    0.00    0.00      0.00
09:29:13      75    0.00    0.00    0.00    0.00    0.00    0.00    0.00 100.00      0.00
09:29:13      76    0.00    0.00    0.00    0.00    0.00    0.00    0.00 100.00      0.00
09:29:13      77    0.00    0.00    0.00    0.00    0.00    0.00    0.00 100.00      0.00
09:29:13      78    0.00    0.00    0.00    0.00    0.00    0.00    0.00 100.00      0.00
09:29:13      79    0.00    0.00    0.00    0.00    0.00    0.00    0.00 100.00      0.00          you can see there is only one CPU CORE (core 74 but is random , other core have same status but just one CPU core)
[root@localhost ~]# vmstat -S m 2
procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu------
r b   swpd   free   buff cache   si   so    bi    bo   in   cs us sy id wa st
3 0     23   1861    203 24267    0    0     8    12    0    0 0 0 99 0 0
4 0     23   1845    203 24262    0    0   602 16460 3682 8121 2 2 96 1 0
3 0     23   1842    203 24276    0    0   692 7520 3297 6610 2 2 97 0 0
3 0     23   1830    203 24277    0    0   786 3040 3302 7118 2 2 97 0 0
4 0     23   1829    203 24277    0    0   126 3144 3247 7343 2 1 97 0 0
3 0     23   1827    203 24279    0    0    76 2944 3292 7502 2 2 96 0 0
3 0     23   1823    203 24281    0    0     0 3248 3164 7656 2 1 97 0 0
2 0     23   1827    203 24279    0    0     0 3646 3080 7480 2 1 97 0 0
2 0     23   1828    203 24279    0    0     0   476 2942 5648 1 1 98 0 0
3 0     23   1824    203 24281    0    0     2 7476 3377 8111 2 2 97 0 0iostat infor
avg-cpu: %user   %nice %system %iowait %steal   %idle
           1.28    0.00    1.29    0.00    0.00   97.43
Device:            tps   Blk_read/s   Blk_wrtn/s   Blk_read   Blk_wrtn
hda               0.00         0.00         0.00          0          0
sda               5.47         0.00        83.58          0        168
sda1              0.00         0.00         0.00          0          0
sda2              5.47         0.00        83.58          0        168
sda3              0.00         0.00         0.00          0          0
sda4              0.00         0.00         0.00          0          0
sda5              0.00         0.00         0.00          0          0
sdb               8.96         0.00       123.38          0        248
sdb1              8.96         0.00       123.38          0        248
avg-cpu: %user   %nice %system %iowait %steal   %idle
           1.27    0.00    1.27    0.00    0.00   97.46
Device:            tps   Blk_read/s   Blk_wrtn/s   Blk_read   Blk_wrtn
hda               0.00         0.00         0.00          0          0
sda               0.00         0.00         0.00          0          0
sda1              0.00         0.00         0.00          0          0
sda2              0.00         0.00         0.00          0          0
sda3              0.00         0.00         0.00          0          0
sda4              0.00         0.00         0.00          0          0
sda5              0.00         0.00         0.00          0          0
sdb              17.50         0.00       236.00          0        472
sdb1             17.50         0.00       236.00          0        472
avg-cpu: %user   %nice %system %iowait %steal   %idle
           1.29    0.00    1.30    0.01    0.00   97.41
Device:            tps   Blk_read/s   Blk_wrtn/s   Blk_read   Blk_wrtn
hda               0.00         0.00         0.00          0          0
sda               0.50         0.00        16.00          0         32
sda1              0.00         0.00         0.00          0          0
sda2              0.50         0.00        16.00          0         32
sda3              0.00         0.00         0.00          0          0
sda4              0.00         0.00         0.00          0          0
sda5              0.00         0.00         0.00          0          0
sdb               7.50         0.00       144.00          0        288
sdb1              7.50         0.00       144.00          0        288more detail:
database version 11.2.0.2.0
system version
[root@localhost ~]# cat /etc/issue
Red Hat Enterprise Linux Server release 5.4 (Tikanga)
Kernel \r on an \m
[root@localhost ~]# lsb_release
LSB Version:    :core-3.1-amd64:core-3.1-ia32:core-3.1-noarch:graphics-3.1-amd64:graphics-3.1-ia32:graphics-3.1-noarch
[root@localhost ~]# uname -a
Linux localhost.localdomain 2.6.18-164.el5 #1 SMP Tue Aug 18 15:51:48 EDT 2009 x86_64 x86_64 x86_64 GNU/Linuxhardware info
vendor_id       : GenuineIntel
cpu family      : 6
model           : 47
model name      :        Intel(R) Xeon(R) CPU E7- 4860 @ 2.27GHz
stepping        : 2
cpu MHz         : 2261.057
cache size      : 24576 KB
physical id     : 3
siblings        : 20
core id         : 18
cpu cores       : 10
apicid          : 229
fpu             : yes
fpu_exception   : yes
cpuid level     : 11
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx pdpe1gb rdtscp lm constant_tsc ida nonstop_tsc pni monitor ds_cpl vmx smx est tm2 cx16 xtpr popcnt lahf_lm
bogomips        : 4522.11
clflush size    : 64
cache_alignment : 64
address sizes   : 44 bits physical, 48 bits virtual
[root@localhost ~]# free -m
             total       used       free     shared    buffers     cached
Mem:         56238      55892        346          0        196      23645
-/+ buffers/cache:      32050      24188
Swap:        16002         22      15979
[root@localhost ~]# df -h
Filesystem            Size Used Avail Use% Mounted on
/dev/sda2              19G 4.9G   14G 27% /
/dev/sda5             230G   27G 192G 12% /home
/dev/sda1              99M   12M   83M 13% /boot
/dev/sdb1             2.9T 2.3T 464G 84% /arrayEdited by: JOhnLiu on Sep 11, 2012 7:31 PM

JOhnLiu wrote:
thanks for reply sb92075
[root@localhost ~]# mpstat -P ALL 2
Linux 2.6.18-164.el5 (localhost.localdomain)    09/12/12
09:29:09     CPU   %user   %nice    %sys %iowait    %irq   %soft %steal   %idle    intr/s
09:29:11     all    0.01    0.00    1.27    0.01    0.00    0.01    0.00   98.69   1658.29
09:29:11       0    0.50    0.00    0.00    0.00    0.00    0.50    0.00   98.99   1657.29
09:29:11      73    0.00    0.00    0.00    0.00    0.00    0.00    0.00 100.00      0.00
09:29:11      74    0.00    0.00 100.00    0.00    0.00    0.00    0.00    0.00      0.00
09:29:11      75    0.00    0.00    0.00    0.00    0.00    0.00    0.00 100.00      0.00
09:29:11      76    0.00    0.00    0.00    0.00    0.00    0.00    0.00 100.00      0.00I think you don't understand what i mean .
there just have ONLY ONE CORE %sys 100
the top command show average of all cpu core sys% usage
when the one core sys% is 100%
the system are very slow .
e.g: when I create a database instance used for a long time . over 2 hours
but generally it will be done at most 1 hours or shorteris any type of OS virtualization involved in this environment?

Database uses only one cpu core from 16 available

Hi,
we have an server with 16 CPU cores, and we discovered from em that it uses only 1 core with 100% and the others are idle.
the initialization parameters for CPU are:
cpu_count 16
parallel_threads_per_cpu 2
resource_manager_cpu_allocation 16.
What can we do to use all 16 cores.
Regards
Nicoale Ancuta

Nicolae Ancuta wrote:
Very interesting poit of view, but since I have for some period of time 1 core on 100% and other cores are idle or 0%,
I don't think that we can say that linux and oracle database 11g is using the best from that server, can you?Well, I did not offer a point of view. I offered fact - a reason why on x86 architecture it is faster to keep threads on the same CPU (if sufficient CPU capacity) then run such threads across CPUs.
As for what you are seeing - we cannot see it. So the only data we have is what you offered. And that does not suffice in making any kind of call as to why you are seeing, or even describing the symptoms correctly.
Why don't you try another example? 3 client server applications. Each client post a request (huge update 100% CPU, small update 0% CPU, huge select 100% CPU). What the server does, it switches between those 2 huge requests an uses only one core on 100% abd the others 15 are sleeping. Why don't use each request on different core and reduce the time?Define "+huge request+". Database operations are typically I/O intensive - not CPU intensive. There are also a number of processes. So if PMON for example is showing high CPU, then that means something different as when DBWR is showing high CPU, versus a dispatcher process showing high CPU.
So you need to provide a lot more detail for us to speculate as to what the problem could be, never mind offering a solution.

Only one CPU core is working during video export from Premiere Media Encoder

Windows Resource Monitor showed cores 'parked' at first. I was able to turn that feature off using regedit. They no longer say they are parked'. but still only one core is at 100% while the other seven cores are at close to zero %. Windows 7 Ultimate SP1 64-bit. i7-2600k processor 3.4 GHz running at 3.8 GHz XMP setting. ASUS P8Z77-V motherboard 32 GB RAM.
I had this problem in the past and fixed when I turned off core parking. But, I recently clean installed Windows and problem has returned. I contacted Microsoft and they assured me that the problems lies with Premiere or AME.
it just took over an hour to export a video that should have taken 10 minutes

This has been driving me CRAZY... so going over the message boards from 2 to 5 am this morning I found the best explanation I have seen. The problem is that Adobe Creative Cloud is NOT "Processor Group Aware". Windows parses any more than 36 cores into "Processor Groups" and while the Pro version of Windows 7 & 8 can handle 256 threads they have to spread them across multiple processor groups.
Simple Version: AREA | How many cores does 3ds Max support?
Microsoft's Explanation: Processor Groups (Windows)
Clearly, this is an Adobe Problem... If any engineers are reading this PLEASE review the below and incorporate it into your next build of Creative Cloud!!!
https://msdn.microsoft.com/en-us/library/windows/hardware/dn653313%28v=vs.85%29.aspx
Again, I bought a VERY expensive machine based on your white paper that recommended Dual Xeon Workstations. Please, Please Give us the product you PROMISED!!!
Michael

Multisim 11 only uses one CPU core during simulation

Hi,
Just recently I've been using MultiSim again, v11 if that matters, and simulating goes slow, to my opinion that is.
Now there are two things that I've noticed:
- Multisim only uses one of two CPU cores during simulation, not both;
- I've enabled CPU throttle (AMD's Cool'n'Quiet) but corespeed remains very low even though Multisim needs CPU power while simulating.
The simulating of a NE555-based LED-flash circuit requires about 28 seconds to get to 100ms in the simulation. Now if I can get the CPU to throttle up, by for example having Prime95 stress one of the two cores, then the simulation only requires 12 seconds to get to 100ms.
So here are my two questions:
1. Is Multisim 11 capable of using more than one CPU core while simulating? If yes, how can I get it to use more than one?
2. Probably not the right forum to ask, but is there a way to force Windows 7 Ultimate x64 to throttle up the CPU when Multisim starts simulating? Since Multisim does not seem to stress the only core it uses enough to throttle it up. Using Prime95 on one core does trigger a throttle up.
With regards,
Bart Grefte
Relevant specs:
Windows 7 Ultimate x64
Multisim v11
AMD A4-3400
16GB RAM

Completely forgot this topic....
Is there a good reason why there is no multicore support? Multisim can certainly use it for simulating.
As for the CPU throttling, I found a batch that can increase/decrease the "minimum processor state"-setting and it works immediately, no reboot required.
@echo off
powercfg.exe -getactivescheme > "%userprofile%\appdata\~apo.tmp"
set /p v_currentscheme= <"%userprofile%\appdata\~apo.tmp"
set v_currentscheme=%v_currentscheme:~24,36%
del "%userprofile%\appdata\~apo.tmp"
powercfg -setacvalueindex %v_currentscheme% 54533251-82be-4824-96c1-47b60b740d00 893dee8e-2bef-41e0-89c6-b55d0929964c %1
powercfg -setdcvalueindex %v_currentscheme% 54533251-82be-4824-96c1-47b60b740d00 893dee8e-2bef-41e0-89c6-b55d0929964c %1
powercfg -s %v_currentscheme%
exit
Usage is simple:
Start -> run -> c:\pathtobatch.bat 100
for "minimum processor state"-setting at 100%
Start -> run -> c:\pathtobatch.bat 5
for "minimum processor state"-setting at 5%
Please note that "set v_currentscheme=%v_currentscheme:~24,36%" is not the same for every language. The original batch had "set v_currentscheme=%v_currentscheme:~19,36%" (most likely for the English version of Windows 7), but since my Windows install is in Dutch, I had to change it in order for it to work.
Running the batch with @echo off removed will show why.

Dual Core G5 using only one CPU

Anyone has an idea about what happened to me last week? Here is what happened:
I let my dual 2.3 GHz Power Mac G5 run over night to run a certain task. When I came back the following morning, the fans were running like crazy and the computer was frozen. I had to reset it. After that it started up, but from then on only used one CPU. In System Profiler as well as in Activity Monitor, only one CPU is shown. After some more days, it would not turn on anymore, not even with one CPU.
What to do now? Thanks for helping me out...

It is insurance. It keeps a system running so you can do a safe shutdown. It protects the boot drive from directory corruption. Protects wired ethernet port from getting fried (someone last week's sad tale).
"Nice idea." Well, yes. Can you drive a car without insurance? I'll take UPS and help protect my systems.
If you want to leave a system running unattended and not come back to a dead or dying system... I have read enough tales of woe that "but it was working yesterday" and "we've had some storms but lights stayed on" that I don't take chances. And I often give advice that isn't 1:1 correlation. Like "backup daily" and "run disk repairs before there is a problem."
maybe it over-heated, too.

External Hard Drive - Only one partition is recognized

I have a 1TB GDrive, NTFS formatted, that has been divided into three partitions. When I connect the drive to my Mac Pro, only one partition is recognized. I have tried downloading Tuxera, rebooting the system, and connecting with different cables. Disc Utility only sees the one partition. I have also tried connecting the drive to another Mac with the same results. While this is not a new drive, it has been used for editing on a PC system, this is the first time it has been connected to a Mac. However, this is the first time that my Mac system has had difficulty reading a partitioned PC formatted drive. And when the drive is connected to a PC, all partitions are recognized and all are read as being healthy.
Any ideas on how to solve this issue would be appreciated!

Mac OS only recently added the ability to resize partitions. With Windows there are so many options, tools, and types of partitions; including extended volumes, non-destructive ability to add a drive to and create mirror and stripe RAID.
If you don't have Windows and don't have MacFuse +3G or Paragon NTFS driver... but at least Windows will let you see, or burn one of the Linux type boot CDs to troubleshoot or more.

Parallelism in oracle using only one dual-core processor

Hi, is usefull or could i use parallel execution in oracle using only one dual core processor?
Can someone explain me why?

Hi
To take advantage of parallel processing you need enough resources (mainly CPU and I/O). If you run serially and the bottleneck is the CPU, then parallel processing might help. On the contrary, if the bottleneck is located in the I/O sub-system, throwing more CPU to it would not make things better. So, it's a question of balance between the CPU and I/O resources you have.
HTH
Chris

Logic 8 using only one CPU while bouncing

Whenever I bounce a project, Logic 8 uses only one CPU. It also spikes this CPU completely, with the CPU meter going into the red area, which is why I am rather keen on persuading Logic to distribute the load.
Any ideas?
(I've given the support document with tips on how to balance multi-core performance a good read, but it doesn't seem to say anything on this particular subject, and following the advice in the document does nothing to change my CPU load.)

Bouncing is a single core process. Just like rendering is in Final Cut Pro. This won't change until Leopard and Apple's ProApps get better at handling multiple cores.
It's redlining because the processor core is working as fast as it can. Computer processors don't just randomly run slower, they use their resources for the tasks at hand. If it only used 50% of a core, the bounce would take twice as long to process.

Color using only one CPU?

When rendering with Color it seams that it using only one CPU, according to "top".
Is it possible to make use of all CPUs?

Color's work is done on the GPU not the CPU, so unfortunately, the answer to your question is, no.

MobileDeviceHelper running @ 100% on one CPU Core

Hi, anyone suggest anything to fix one of my CPU cores runs MobileDeviceHelper (32Bit) at 100% consistently after iTunes is started.
The machine is a new build with Windows 8 64bit all updates and patches applied. All latest manufacturer chipset and other relevant drivers and every other part of the machine works perfectly. If I end the process, distnoted (32 bit) then replaces it and takes over with another core running at 100%. Ending that process and mobiledevicehelper comes back at one core 100% usage, then ending that and it behaves.
I have tried restarting the machine, installing updates, disabling the task in task manager, resetting the network adapter (winsock reset) and disabling ApplePush, and itunes helper at startup but am out of ideas now! I haven't even sync'd my phone to it yet.
Im fast thinking iTunes seems to be getting more buggy each release (I haven't been able to burn an audio cd on the new machine as it crashes while attempting to, but other software can burn the same playlist and file after dragging out of the iTunes playlist) yet iTunes on my Macbook runs fine!

oh and its iTunes 12.1.1.4 64Bit with Windows 8.1 Pro 64Bit all latest updates.
As a workaround I have found the two files, renamed them so iTunes cant call them and everything still works fine which begs the questions what are they doing that uses 100% of one CPU core! I haven't setup my iPhone as a remote, or my AppleTVs yet, hoping they don't rely on these services!

MAXDB on LINUX use only one CPU

Hi all,
I have a question regarding the usage of parameter MAXCPU. I have set it the value 3. But I do see only one cpu used and almost at 100% with the command "top".
My release is MAXDB 7.7 and the kernel for Linux is SMP.
Someone can tell me what influence this behaviour?
thank you all

Hi,
The database kernel runs as one process divided into threads. Did you start top -H to check the Cpu-Usage?
Threads can be active in parallel on several processors within the operating system. Threads perform various tasks.
MaxCPU has influence on the number of Threads which are created during restart.
In your case after restart you have 3 Threads ( UKT ) -> you can check this with x_cons show all
How many threads are active in parallel depends on the distribution of the User Tasks on the Threads and the applications which are connected to the User Tasks.
x-cons <DBNAME> show active shows the status of the different Tasks in an UKT. Notrice that an UKT can contain several Tasks but at one time only one Task in The UKT can have the CPU.
MaxDb manages this via internal dispatching.
You will find more information about the process structure in the Expert Sessions recording and slides of session: Session 18: SAP MaxDB Architecture
You can download the session here -> SAP MaxDB: The SAP Database - Training
Regards, Christiane

How is oracle 10g configured to use only one cpu

Today a customer informed me that their instance of 10g was configured to run on only one of four cpu's in a Solaris server.
How did they do this ?
George

On Solaris 10 this could be done in a number of ways.
One way is to create a processor set with only one CPU in it, and bind the Oracle processes to it. They cannot run on any other CPU any more. As long as you bind the listener to it, any network based connections will come from the listener and so be in the same processor set.
A more sophisticated way is to create a Zone with a 1 CPU resource in it. A Zone is a software container within Solaris 10, and it can be associated a processor set. The difference to the previous way is that no explicit binding of processes is necessary. A Zone looks like a Solaris system in its own right. And everything in that Zone can only run on the CPUs in the processor set bound to the Zone. So Oracle could be started up in the Zone in the normal way, and be restricted to only one physical CPU, always.
There is also the possibility of using Solaris Resource Manager, for a softer control of CPU. But this does not restrict processes to a single physical processor. It is a fair share scheduler that allows different processes to receive their configured slice of CPU time, on average. So processes can still run on different CPUs in the system, but the averaging means that no single workload can maximise the system and restrict access for other workloads.
And the latest Sun systems are capable of running a virtualisation layer when the system boots (sometimes called a HyperVisor), and this partitions the hardware up into virtual systems, before Solaris then loads and runs on top of these. So you can configure a 4 CPU system to look like 4 * 1 CPU systems through virtualisation, and each runs its own instance of Solaris. And then one of these you run Oracle.
John

[Solved] Dualcore Macbook using only one cpu

Hello,
I have a dual core macbook running Arch, default installation with default kernel (64bit). I just noticed that I only have one cpu running, even when I do some cpu-intensive work. Here is the output of /proc/cpuinfo:
└─■ cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 15
model name : Intel(R) Core(TM)2 Duo CPU T7500 @ 2.20GHz
stepping : 11
cpu MHz : 800.000
cache size : 4096 KB
physical id : 0
siblings : 2
core id : 0
cpu cores : 2
apicid : 0
initial apicid : 0
fpu : yes
fpu_exception : yes
cpuid level : 10
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm constant_tsc arch_perfmon pebs bts rep_good aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm lahf_lm dts tpr_shadow vnmi flexpriority
bogomips : 4391.55
clflush size : 64
cache_alignment : 64
address sizes : 36 bits physical, 48 bits virtual
power management:
processor : 1
vendor_id : GenuineIntel
cpu family : 6
model : 15
model name : Intel(R) Core(TM)2 Duo CPU T7500 @ 2.20GHz
stepping : 11
cpu MHz : 800.000
cache size : 4096 KB
physical id : 0
siblings : 2
core id : 1
cpu cores : 2
apicid : 1
initial apicid : 1
fpu : yes
fpu_exception : yes
cpuid level : 10
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm constant_tsc arch_perfmon pebs bts rep_good aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm lahf_lm dts tpr_shadow vnmi flexpriority
bogomips : 4390.91
clflush size : 64
cache_alignment : 64
address sizes : 36 bits physical, 48 bits virtual
power management:
which shows two cpus registered to the system, but when I do top, I get the following output:
top - 00:29:07 up 7:33, 0 users, load average: 0.05, 0.05, 0.05
Tasks: 93 total, 2 running, 91 sleeping, 0 stopped, 0 zombie
Cpu(s): 9.0%us, 4.1%sy, 0.2%ni, 86.1%id, 0.7%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 4020236k total, 1386244k used, 2633992k free, 53056k buffers
Swap: 0k total, 0k used, 0k free, 826672k cached
Which tells me I only have one cpu. Am I doing something wrong? I have cpufreq-utils and laptop-mode running, but I don't think it should affect this. The following is the output of cpufreq-info
└─■ cpufreq-info
cpufrequtils 008: cpufreq-info (C) Dominik Brodowski 2004-2009
Report errors and bugs to [email protected], please.
analyzing CPU 0:
driver: acpi-cpufreq
CPUs which run at the same hardware frequency: 0 1
CPUs which need to have their frequency coordinated by software: 0
maximum transition latency: 10.0 us.
hardware limits: 800 MHz - 2.20 GHz
available frequency steps: 2.20 GHz, 2.00 GHz, 1.80 GHz, 1.60 GHz, 1.40 GHz, 1.20 GHz, 800 MHz
available cpufreq governors: ondemand, performance
current policy: frequency should be within 800 MHz and 2.20 GHz.
The governor "ondemand" may decide which speed to use
within this range.
current CPU frequency is 800 MHz.
analyzing CPU 1:
driver: acpi-cpufreq
CPUs which run at the same hardware frequency: 0 1
CPUs which need to have their frequency coordinated by software: 1
maximum transition latency: 10.0 us.
hardware limits: 800 MHz - 2.20 GHz
available frequency steps: 2.20 GHz, 2.00 GHz, 1.80 GHz, 1.60 GHz, 1.40 GHz, 1.20 GHz, 800 MHz
available cpufreq governors: ondemand, performance
current policy: frequency should be within 800 MHz and 2.20 GHz.
The governor "ondemand" may decide which speed to use
within this range.
current CPU frequency is 800 MHz.
and it also shows the two cpus, and cpu1 frequency gets higher when I do cpu intensive work, as it should, but cpu0 always stays at 800MHz. Can anybody help me please? Thanks!
Last edited by kcirick (2011-01-24 15:41:21)

Thanks foutrelis. I installed htop and monitored my cpu usage. It seems to be in working order. When I mentioned "cpu intensive work", it turned out that I was talking about something that was using average 50% on both cores, and assumed that meant one was at 100% and the other was 0% (I have conky tell me the average cpu usage).
Marking this as solved. Thanks again!

Kernel showing 1 cpu only in duo core 2 [SOLVED]

hey, I've search for help but all I get in hyperthreading..
Intel says it's multi-core(dualcore)
$ cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 15
model name : Intel(R) Core(TM)2 CPU T7200 @ 2.00GHz
stepping : 6
cpu MHz : 2000.139
cache size : 4096 KB
physical id : 0
siblings : 1
core id : 0
cpu cores : 1
apicid : 0
initial apicid : 0
fpu : yes
fpu_exception : yes
cpuid level : 10
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm constant_tsc up arch_perfmon pebs bts rep_good aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm lahf_lm tpr_shadow
bogomips : 4001.95
clflush size : 64
cache_alignment : 64
address sizes : 36 bits physical, 48 bits virtual
power management:
is this info right??
Last edited by funkmuscle (2010-11-03 11:42:28)

lilsirecho wrote:
This is my computer dats....Post yours...
o
processor : 0
vendor_id : GenuineIntel
cpu family : 15
model : 6
model name : Intel(R) Pentium(R) D CPU 2.80GHz
stepping : 4
cpu MHz : 2800.055
cache size : 2048 KB
physical id : 0
siblings : 2
core id : 0
cpu cores : 2
apicid : 0
initial apicid : 0
fpu : yes
fpu_exception : yes
cpuid level : 6
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm constant_tsc pebs bts pni dtes64 monitor ds_cpl est cid cx16 xtpr pdcm lahf_lm
bogomips : 5602.44
clflush size : 64
cache_alignment : 128
address sizes : 36 bits physical, 48 bits virtual
power management:
processor : 1
vendor_id : GenuineIntel
cpu family : 15
model : 6
model name : Intel(R) Pentium(R) D CPU 2.80GHz
stepping : 4
cpu MHz : 2800.055
cache size : 2048 KB
physical id : 0
siblings : 2
core id : 1
cpu cores : 2
apicid : 1
initial apicid : 1
fpu : yes
fpu_exception : yes
cpuid level : 6
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm constant_tsc pebs bts pni dtes64 monitor ds_cpl est cid cx16 xtpr pdcm lahf_lm
bogomips : 5602.41
clflush size : 64
cache_alignment : 128
address sizes : 36 bits physical, 48 bits virtual
power management:
[root@n6re ~]#
I did post at the start of this thread:
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 15
model name : Intel(R) Core(TM)2 CPU T7200 @ 2.00GHz
stepping : 6
cpu MHz : 2000.139
cache size : 4096 KB
physical id : 0
siblings : 1
core id : 0
cpu cores : 1
apicid : 0
initial apicid : 0
fpu : yes
fpu_exception : yes
cpuid level : 10
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm constant_tsc up arch_perfmon pebs bts rep_good aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm lahf_lm tpr_shadow
bogomips : 4001.95

Only one CPU core recognized [solved]

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