RHEL high percentage of processor time from system
Linux 2.4.21-37.ELsmp #1 SMP
I have a data-intensive set of programs, using IBM's DB2 V8.1.7 (IIRC). I used to run it on a machine with two 10,000 rpm Ultra-2 SCSI hard drives and...
I'm running RHEL on a dual Xeon box. When I run any kind of Fortran program that I've compiled, the system load is very high, for example:
The disk i-o is actually pretty low ... I really don't think it should be an issue. No other processes are...
64 processes: 59 sleeping, 5 running, 0 zombie, 0 stopped CPU states: cpu user nice system irq softirq iowait idle total 0.0% 68.6% 31.0% 0.1% 0.0% 0.0% 0.0% cpu00 0.1% 77.0% 22.7% 0.0% 0.0% 0.0% 0.0% cpu01 0.0% 75.4% 23.7% 0.7% 0.0% 0.0% 0.0% cpu02 0.0% 73.1% 26.6% 0.0% 0.0% 0.0% 0.1% cpu03 0.0% 48.9% 51.0% 0.0% 0.0% 0.0% 0.0% Mem: 3598516k av, 3032044k used, 566472k free, 0k shrd, 375128k buff 704952k actv, 1539016k ind, 139936k inc Swap: 511668 plus 12k av, 0k used, 511668 plus 12k free 68 plus 10508k cached
PID USER PRI NI SIZE RSS SHARE STAT %CPU %MEM TIME CPU COMMAND 16828 jbenjam 35 10 4760 4736 940 R N 24.9 0.1 6:38 2 iPPm 16756 jbenjam 35 10 5052 5028 944 R N 24.8 0.1 6:42 3 iPPm 168 plus 102 jbenjam 35 10 4896 4872 944 R N 24.7 0.1 6:32 0 iPPm 168 plus 176 jbenjam 35 10 4984 4960 944 R N 24.5 0.1 6:26 1 iPPm
The same exact programs, running on a Fedora Core 3 box (with 1 HT processor):
top - 11:14:13 up 17 days, 18:36, 4 users, load average: 4.07, 4.09, 4.15 Tasks: 109 total, 5 running, 103 sleeping, 0 stopped, 1 zombie Cpu(s): 4.2% us, 8.7% sy, 27.4% ni, 59.2% id, 0.5% wa, 0.0% hi, 0.1% si Mem: 2074720k total, 2024236k used, 50484k free, 77000k buffers Swap: 4095992k total, 944156k used, 3151836k free, 111532k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
13515 jbenjam 35 10 11580 4796 820 R 53.5 0.2 284:11.96 iPPm
Ben It depends what is going on. I run BOINC projects at nice 19 to gobble up the spare time doing something remotely useful. So...
12910 jbenjam 33 10 11580 4816 820 R 51.5 0.2 285:13.25 iPPm
12703 jbenjam 35 10 11580 4772 820 R 49.5 0.2 288:23.09 iPPm
13230 jbenjam 35 10 11580 4796 820 R 49.5 0.2 285:20.01 iPPm
I've seen some other people complain about this in the past, but no good answers ever sprung up. If the RHEL box is idling, then of course the system loads are negligible. These programs are moderately i-o intensive to disk -- although why would RHEL have such a hard time vs. Fedora Core?
Unfortunately I have no control over the RHEL machine, so I can't go in and tweak things. I am friends with the sysadmin, so I could ask him to do certain things.
Thanks for your ideas!
-Ben
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