[HTCondor-users] cgroups issue (cgroup invalid operation)

[SCHAER Frederic <frederic.schaer@xxxxxx>]

Hi,

 

So, I deployed cgroups for htcondor…. And I’m having issues.

First : looks like I have to restart condor, not just condor_reconfig it. (right ?)

Without a service restart, I get logs about ‘cgroups not initialized’.

 

But problem is that even after restarting condor, the ProcsLog shows these errors :

 

03/18/16 20:59:53 : Unable to read cgroup htcondor/condor_home_condor_slot1_2@wn296 cpuacct stats (ProcFamily 3278233): Cgroup invalid operation.

03/18/16 20:59:53 : Internal cgroup error when retrieving CPU statistics: Cgroup invalid operation

03/18/16 20:59:53 : Unable to read cgroup htcondor/condor_home_condor_slot1_2@wn296 memory stats (ProcFamily 3278233): 50016 No such file or directory.

 

I am deploying cgroups so that memory accounting (RSS) doesn’t double-tripple count stuff, which in the end is causing the jobs to be killed after they are reported as consuming more memory than requested.

I’m wondering how to fix this ?

To answer coming questions :

 

-          Yes, cgconfig is running, and cgroups are mounted (but not visible with the mount command – sl6x/sl6.7 here) :

[root@wn296 htcondor]# service cgconfig status

Running

[root@wn296 htcondor]# grep cgroup /proc/mounts

cgroup /cgroup/cpu cgroup rw,relatime,cpu 0 0

cgroup /cgroup/cpuset cgroup rw,relatime,cpuset 0 0

cgroup /cgroup/cpuacct cgroup rw,relatime,cpuacct 0 0

cgroup /cgroup/devices cgroup rw,relatime,devices 0 0

cgroup /cgroup/memory cgroup rw,relatime,memory 0 0

cgroup /cgroup/freezer cgroup rw,relatime,freezer 0 0

cgroup /cgroup/net_cls cgroup rw,relatime,net_cls 0 0

cgroup /cgroup/blkio cgroup rw,relatime,blkio 0 0

 

-          Yes, I see htcondor subdirectories, and I even see PIDs in the subdirectories tasks files :

 

[root@wn296 htcondor]# wc -l /cgroup/memory/htcondor/condor_home_condor_slot1_*/tasks|sed -r -e 's%(wn...).*/%\1/%'

0 /cgroup/memory/htcondor/condor_home_condor_slot1_10@wn296/tasks

0 /cgroup/memory/htcondor/condor_home_condor_slot1_11@wn296/tasks

6 /cgroup/memory/htcondor/condor_home_condor_slot1_1@wn296/tasks

22 /cgroup/memory/htcondor/condor_home_condor_slot1_2@wn296/tasks

22 /cgroup/memory/htcondor/condor_home_condor_slot1_3@wn296/tasks

22 /cgroup/memory/htcondor/condor_home_condor_slot1_4@wn296/tasks

0 /cgroup/memory/htcondor/condor_home_condor_slot1_5@wn296/tasks

0 /cgroup/memory/htcondor/condor_home_condor_slot1_6@wn296/tasks

0 /cgroup/memory/htcondor/condor_home_condor_slot1_7@wn296/tasks

0 /cgroup/memory/htcondor/condor_home_condor_slot1_8@wn296/tasks

0 /cgroup/memory/htcondor/condor_home_condor_slot1_9@wn296/tasks

72 total

 

-          Cgroups config :

 

[root@wn296 htcondor]# cat /etc/cgconfig.{conf,d/htcondor.conf}

# This file is being maintained by Puppet.

# DO NOT EDIT

 

mount {

      cpu     = /cgroup/cpu;

      cpuset  = /cgroup/cpuset;

      cpuacct = /cgroup/cpuacct;

      devices = /cgroup/devices;

      memory  = /cgroup/memory;

      freezer = /cgroup/freezer;

      net_cls = /cgroup/net_cls;

      blkio   = /cgroup/blkio;

}

group htcondor {

      cpu {}

      cpuacct {}

      memory {}

      freezer {}

      blkio {}

}

 

-          And condor version : 8.4.3-2

 

The problem I have is that I have jobs submitted (not by me) with Memory requirements and that these jobs are still killed because of the RSS approximative accounting without cgroups – and for now, the killing is still going on :’(

 

Any ideas about what’s wrong, and better, how to fix ? I admin I’m very new to cgroups, so it might be that I’m mistaken somewhere…

Thanks

 

Frederic