Hi Aaron, Thanks for the reply. I agree ultimately the amount of CPU usage is what that matters. But still seems high occupying kernel data structures. Infact we are planning to run multiple MDTs for different logical-volumes on same node. The worry is the number of processes might dramatically increase, like 400 processes for two Lustre MDT set.
We are designing for a low-end system with system memory as low as 256MB, these resources are precious :-) - Sridharan > -----Original Message----- > From: Aaron Knister [mailto:[EMAIL PROTECTED] > Sent: Wednesday, February 07, 2007 8:35 AM > To: Sridharan Ramaswamy (srramasw) > Cc: Andreas Dilger; [email protected] > Subject: Re: [Lustre-discuss] Number of processes in Lustre tunable? > > There is no real reason that I see to reduce the number of Lustre > processes. It won't cause any ill effects on other processes running. > Lustre is heavily multi threaded hence the large number of > lustre procs. > > Sridharan Ramaswamy (srramasw) wrote: > > Hi Andreas, > > > > I didn't see any reply earlier. Can you please comment on this > > question on number of Lustre processes? > > > > - Sridharan > > > > > -------------------------------------------------------------- > ---------- > > *From:* [EMAIL PROTECTED] > > [mailto:[EMAIL PROTECTED] *On Behalf Of > > *Sridharan Ramaswamy (srramasw) > > *Sent:* Tuesday, January 23, 2007 10:39 AM > > *To:* [email protected] > > *Subject:* [Lustre-discuss] Number of processes in > Lustre tunable? > > > > > > I'm tring to measure the overhead of having Lustre on the > > system. Among other things, I noticed it starts lot of > processes, > > > > root 4565 1 0 Jan03 ? 00:00:00 [ll_mdt_attr_14] > > root 4636 1 0 Jan03 ? 00:00:01 [ll_ost_13] > > root 4651 1 0 Jan03 ? 00:00:08 [ll_ost_io_13] > > root 4550 1 0 Jan03 ? 00:00:03 [ll_mdt_14] > > root 4516 1 0 Jan03 ? 00:00:00 [ldlm_cb_31] > > I can account about 200 processes related to Lustre on an OST > > node. That seems a lot considering we would like to run other > > applications on the same node. Is it possible to tune > these number > > of processes down? Say reduce 32 ldlm process to about 8. What > > kind of performance degradation to expect if we can do that? > > > > thanks, > > Sridharan > > > > > -------------------------------------------------------------- > ---------- > > > > _______________________________________________ > > Lustre-discuss mailing list > > [email protected] > > https://mail.clusterfs.com/mailman/listinfo/lustre-discuss > > > _______________________________________________ Lustre-discuss mailing list [email protected] https://mail.clusterfs.com/mailman/listinfo/lustre-discuss
