Messages in this thread | | | Date | Mon, 10 Feb 2003 21:21:58 -0500 | Subject | No /proc/*/wchan files in 2.5.60 - dbench does nothing | From | rwhron@earthlin ... |
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While running dbench 64 on 2.5.60 on quad P3 xeon...
uptime 6:09pm up 29 min, 1 user, load average: 0.00, 0.00, 0.03
There are 64 dbench processes though... rwhron@dev4-003:~$ ps aux|grep -c dbench 66
There are no files in the dbench tmp directory. I can cp a file and mkdir with no problem.
wli suggested looking at the wchan file, but there is none.
root@dev4-003:/proc/1134# ls cmdline cwd environ exe fd maps mem mounts root stat statm status
root@dev4-003:/proc/1134# find /proc -name wchan root@dev4-003:/proc/1134#
root@dev4-003:/proc/1134# cat status Name: dbench State: S (sleeping) Tgid: 1134 Pid: 1134 PPid: 1109 TracerPid: 0 Uid: 0 0 0 0 Gid: 0 0 0 0 FDSize: 256 Groups: 0 1 2 3 4 6 10 1 2 3 4 6 10 VmSize: 1468 kB VmLck: 0 kB VmRSS: 400 kB VmData: 100 kB VmStk: 8 kB VmExe: 12 kB VmLib: 1312 kB SigPnd: 0000000000000000 SigBlk: 0000000000000000 SigIgn: 8000000000000007 SigCgt: 0000000000020000 CapInh: 0000000000000000 CapPrm: 00000000fffffeff CapEff: 00000000fffffeff
root@dev4-003:/proc/1134# cat statm 367 100 340 4 0 363 0
root@dev4-003:/proc/1134# cat stat 1134 (dbench) S 1109 957 851 768 1221 256 95 0 103 0 0 1 0 0 15 0 0 0 34359 1503232 100 4294967295 134512640 134523852 3221223712 3221223520 1074715817 0 0 7 131072 3222392583 0 0 17 2 0 0
Based on 3222392583 in /proc/dbench_parent/stat, wli suggested looking for 0xC011CF07 in System.map:
root@dev4-003:/proc/1134# grep -C3 -i C011CF /boot/System.map-2.5.60 c011ca10 t wait_task_zombie c011cb70 t wait_task_stopped c011cce0 T sys_wait4 c011cf40 T sys_waitpid c011cf5a t .text.lock.exit c011d0f0 T do_getitimer c011d1f0 T sys_getitimer c011d260 T it_real_fn
wli said it looks like wait4 is broken.
-- Randy Hron http://home.earthlink.net/~rwhron/kernel/bigbox.html
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