On Thu, May 15, 2008 at 08:23:20AM -0400, Aaron Knister wrote: > Ah! That would make a lot of sense. echoing 0 to statahead_count doesn't > really do anything other than hang my session. Thanks!
I think the hang echo'ing into /proc is another bug, but yeah, deal with the big ones first :-) cheers, robin > -Aaron > > On May 15, 2008, at 4:36 AM, Yong Fan wrote: > >> Robin Humble ??????: >>> On Fri, May 02, 2008 at 03:16:31PM -0700, Andreas Dilger wrote: >>> >>>> On Apr 30, 2008 11:40 -0400, Aaron Knister wrote: >>>> >>>>> Some more information that might be helpful. There is a particular code >>>>> that one of our users runs. Personally after the trouble this code has >>>>> caused us we'd like to hand him a calculator and disable his accounts >>>>> but >>>>> sadly that's not an option. Since the time of the hang, there is what >>>>> seems >>>>> to be one process associated with lustre that is running as the userid >>>>> of >>>>> the problem user- "ll_sa_15530". A trace of this process in its current >>>>> state shows this - >>>>> >>>>> Is this a problem with the lustre readahead code? If so would this fix >>>>> it? >>>>> "echo 0 > /proc/fs/lustre/llite/*/statahead_count " >>>>> >>>> Yes, this appears to be a statahead problem. There were fixes added to >>>> 1.6.5 that should resolve the problems seen with statahead. In the >>>> meantime >>>> I'd recommend disabling it as you suggest above. >>>> >>> >>> we're seeing the same problem. >>> >>> I think the workaround should be: >>> echo 0 > /proc/fs/lustre/llite/*/statahead_max >>> ?? >>> >>> /proc/fs/lustre/llite/*/statahead_count is -r--r--r-- >>> >> Sure. >> "/proc/fs/lustre/llite/*/statahead_count" is statistics variable. >> "/proc/fs/lustre/llite/*/statahead_max " is the switch for >> enable/disable directory statahead. >> >> Regrads! >> -- >> Fan Yong >>> cheers, >>> robin >>> >>> ps. sorry I've been too busy this week to look at the llite_lloop stuff. >>> _______________________________________________ >>> Lustre-discuss mailing list >>> [email protected] >>> http://lists.lustre.org/mailman/listinfo/lustre-discuss >>> >> >> _______________________________________________ >> Lustre-discuss mailing list >> [email protected] >> http://lists.lustre.org/mailman/listinfo/lustre-discuss > > Aaron Knister > Systems Administrator > Center for Research on Environment and Water > > (301) 595-7000 > [EMAIL PROTECTED] > > > > > _______________________________________________ Lustre-discuss mailing list [email protected] http://lists.lustre.org/mailman/listinfo/lustre-discuss
