On Wednesday 21 June 2006 12:17, Ian mu wrote: > Hiya, > > Currently running Centos 4.2 x86_64 dist on a dual 3G xeon, 2G ram, > scsi setupand everythings been running fine on it for some time. Then at > 4am last night something kicked in (have mrtg running monitoring when) and > since then its been running a load of about 1.5 (normally around 0.4). CPU > usage is Cpu(s): 1.1% us, 0.6% sy, 0.0% ni, 97.9% id, 0.2% wa, 0.1% > hi, 0.1%si. > > Can't see any new processes that would cause the load, just wondering is > there any way to try and track down whats actually causing this? It's not > excessive load, but want to add some new services and wary now, its > something that seems wrong given the sudden increase at 4am (think thats > when some o.s housekeeping tasks are normally scheduled, but there's none > running that I can see that started today). > > Just hoping someone may have some tips on checking whats always waiting or > how to isolate whats happening. hit it with the big sledgehammer, oprofile :-) that will very likely tell you if the kernel is doing something (besides the expected mwait_idle-ish...). rough guide (not for cut-n-paste): yum install oprofile kernel-smp-devel (and manual install of kernel-debuginfo) opcontrol --setup --vmlinux=...vmlinux from -debuginfo opcontrol --reset ; --start ; sleep ; --stop opreport -l -p /lib/modules/$uname -r | head /Peter > As said, ps -ef shows no new processes, and > cpu usage is very low. > > Tia, Ian -------------- next part -------------- A non-text attachment was scrubbed... Name: not available Type: application/pgp-signature Size: 191 bytes Desc: not available URL: <http://lists.centos.org/pipermail/centos/attachments/20060621/ad1ae2d9/attachment-0005.sig>