I received the following from Wendy in response to the question: hmm.... I'm not familiar with this version of GFS but it is ok ... will see what oprofile says. A good tutorial can be found at: http://people.redhat.com/wcohen/ The following is a cheat sheet for you - if you have questions, let us know. 0. Obtain a script called "opreport_module" in Will's people page; put it into /tmp and chmod +x. 1. opcontrol --init 2. opcontrol --setup --vmlinux=/usr/lib/debug/lib/modules/`uname -r`/vmlinux 3. opcontrol --start 4. (run your ls here) 5. opcontrol --dump 6. opcontrol --shutdown 7. opreport --long-filenames (pipe this output to a file and email me) 8. /tmp/opreport_module /gfs (pipe this output to a file and email me). -- Wendy -----Original Message----- From: bigendian@xxxxxxxxx [mailto:bigendian@xxxxxxxxx] Sent: Wednesday, December 13, 2006 8:23 AM To: linux clustering Subject: Re: Ls and globbing taking ridiculously long on GFS I know this is an old thread, but I'm curious how to run oprofile myself. Any tips? Thanks, Tom On 11/7/06, Dylan Vanderhoof < DylanV@xxxxxxxxxxxxx> wrote: Certainly. dylanv@iscsi0 /var/www/netresponse/lib/NetResponse/Controller $ gfs_tool version gfs_tool 1.03.00 (built Oct 17 2006 15:10:45) Copyright (C) Red Hat, Inc. 2004-2005 All rights reserved. dylanv@iscsi0 /var/www/netresponse/lib/NetResponse/Controller $ uname -a Linux iscsi0 2.6.17-gentoo-r8 #8 SMP Fri Sep 15 13:57:05 PDT 2006 i686 Intel(R) Xeon(TM) CPU 3.00GHz GNU/Linux As long as its not too disruptive, I can definitely run oprofile. Instructions would be handy however. =) -Dylan > -----Original Message----- > From: Wendy Cheng [mailto:wcheng@xxxxxxxxxx] > Sent: Tuesday, November 07, 2006 11:00 AM > To: linux clustering > Subject: Re: Ls and globbing taking > ridiculously long on GFS > > > Dylan Vanderhoof wrote: > > I understand that a df, or ls -l that requires statting > files should be > > slow. However, I'm seeing ridiculous performance of just an ls, or > > anything doing file globbing in directory reads. > > > My guess is that you have lots of small writes before the "ls" that > generates the disk flushing. Could you pass your kernel and > gfs versions > ? Mind running oprofile on your node (I can pass the > instructions if you > like) so I can take a look ? > > -- Wendy > > -- > Linux-cluster mailing list > Linux-cluster@xxxxxxxxxx > https://www.redhat.com/mailman/listinfo/linux-cluster > -- Linux-cluster mailing list Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster -- Linux-cluster mailing list Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster
