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Old 01-16-2009, 09:28 AM   #1
hendrytjen
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Need help on CPU Redhat for POWER


Hi guys,

thank you for reading this thread.

i am totally a newbie in Linux and need some help regarding CPU Usage on my IBM P520 with 8 cores installed, 8Gig RAM.

the problem is that the CPU occupied for a process is always limitted to 99.9% shown in 'top' as follow: (i tried on 2 different box and found the same problem, which i believe and hope it would go faster)

top - 20:45:25 up 587 days, 2:01, 3 users, load average: 26.72, 23.61, 22.10
Tasks: 142 total, 2 running, 140 sleeping, 0 stopped, 0 zombie
Cpu(s): 52.0% us, 47.5% sy, 0.1% ni, 0.1% id, 0.0% wa, 0.1% hi, 0.2% si
Mem: 7791156k total, 6844564k used, 946592k free, 13512k buffers
Swap: 8385848k total, 1831556k used, 6554292k free, 417520k cached

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
8365 root 16 0 844m 238m 10m S 99.9 3.1 2732:40 javaserver
10379 root 16 0 646m 27m 4888 S 0.7 0.4 307:48.89 javanoti
13050 root 15 0 2194m 398m 10m S 0.7 5.2 47:13.54 javamwimca_mala

-----------------------------------------------------------------------------------------

top - 20:46:54 up 137 days, 7:34, 2 users, load average: 2.98, 3.34, 3.51
Tasks: 187 total, 1 running, 186 sleeping, 0 stopped, 0 zombie
Cpu(s): 9.2% us, 0.7% sy, 0.0% ni, 87.9% id, 1.6% wa, 0.1% hi, 0.5% si
Mem: 7790880k total, 7782072k used, 8808k free, 50024k buffers
Swap: 8385848k total, 264k used, 8385584k free, 6870568k cached

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
23314 mysql 16 0 706m 559m 5460 S 99.9 7.4 2306:11 mysqld
6261 root 15 0 0 0 0 S 1.9 0.0 84:27.40 kjournald
26478 root 15 0 2424 988 724 R 1.9 0.0 0:00.02 top
the redhat version i currently use is :


Red Hat Enterprise Linux AS release 4 (Nahant Update 3)
Linux APP2 2.6.9-34.EL #1 SMP Fri Feb 24 16:46:57 EST 2006 ppc64 ppc64 ppc64 GNU/Linux
very much appreciated for the help and advice.

thanks.
 
Old 01-16-2009, 09:43 AM   #2
syg00
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Quote:
Originally Posted by hendrytjen View Post
the problem is that the CPU occupied for a process is always limitted to 99.9% shown in 'top'
That's not a problem, just basic physics - a single process can only run on 1 CPU, and by definition 100% is all there is.
Multi-threaded applications can take advantage of extra processors (CPUs), but not single threaded apps.
 
Old 01-16-2009, 10:26 AM   #3
hendrytjen
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Quote:
Originally Posted by syg00 View Post
That's not a problem, just basic physics - a single process can only run on 1 CPU, and by definition 100% is all there is.
Multi-threaded applications can take advantage of extra processors (CPUs), but not single threaded apps.

For comparison, i also have another linux box using dual Intel Quad Core and also runs mysql, but it can reach to 175% CPU usage shown in 'top'.

i need this POWER box to do the same for my applications.
 
Old 01-16-2009, 10:30 AM   #4
hendrytjen
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in addition,

MySql is multi threaded application. and lookin deeper into the top, the cpu time is distributed through the cores..

top - 05:28:44 up 25 days, 18:33, 2 users, load average: 0.90, 1.06, 1.20
Tasks: 701 total, 1 running, 700 sleeping, 0 stopped, 0 zombie
Cpu0 : 14.1% us, 2.0% sy, 0.0% ni, 83.6% id, 0.3% wa, 0.0% hi, 0.0% si
Cpu1 : 10.2% us, 2.3% sy, 0.0% ni, 87.5% id, 0.0% wa, 0.0% hi, 0.0% si
Cpu2 : 7.5% us, 1.0% sy, 0.0% ni, 88.6% id, 2.3% wa, 0.3% hi, 0.3% si
Cpu3 : 11.1% us, 2.0% sy, 0.0% ni, 86.3% id, 0.3% wa, 0.3% hi, 0.0% si
Cpu4 : 10.8% us, 1.0% sy, 0.0% ni, 86.2% id, 1.6% wa, 0.3% hi, 0.0% si
Cpu5 : 8.9% us, 4.3% sy, 0.0% ni, 86.5% id, 0.3% wa, 0.0% hi, 0.0% si
Cpu6 : 17.5% us, 2.0% sy, 0.0% ni, 80.2% id, 0.3% wa, 0.0% hi, 0.0% si
Cpu7 : 4.6% us, 2.6% sy, 0.0% ni, 92.2% id, 0.3% wa, 0.0% hi, 0.3% si
Mem: 7823024k total, 7809488k used, 13536k free, 64264k buffers
Swap: 8388472k total, 192k used, 8388280k free, 6749000k cached

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
6208 mysql 15 0 746m 534m 5348 S 96.5 7.0 41196:07 mysqld
21408 root 16 0 2696 1380 788 S 1.3 0.0 3:38.21 top
26270 root 16 0 2700 1384 788 R 1.3 0.0 0:00.55 top
 
Old 01-16-2009, 05:06 PM   #5
syg00
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Then you've hit the limit of that process.
Might be busy, might be something specific to the architecture change (PPC vs. Intel), might be a bug. First place to look would be the MySql options and ensure they are appropriate for the PPC environment.
No suggestions as I don't use either.
 
  


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