Re: [HTCondor-users] cgroups in RHEL 7

[Brian Bockelman <bbockelm@xxxxxxxxxxx>]

Hi Andrew,

I forget the details of how Garhan set this up locally.  However, I think you want the base cgroup to be the same cgroup that systemd automatically creates.  Should be something like:

BASE_CGROUP=/system.slice/condor.service

(look at /proc/`pidof condor_master`/cgroup to see where things are.)

It's also possible that newer versions of systemd are mounting the cgroup filesystem tree as read-only (but I think that's only the latest fedoras?).

Brian

> On Apr 3, 2015, at 9:49 AM, <andrew.lahiff@xxxxxxxxxx> <andrew.lahiff@xxxxxxxxxx> wrote:
> 
> Hi,
> 
> Is the cgroup support in HTCondor expected to work in RHEL 7/SL7? I've done a test using the standard way of enabling cgroups, i.e. I installed libcgroup-tools, added to /etc/cgconfig.conf:
> 
> group htcondor {
>        cpu {}
>        cpuacct {}
>        memory {}
>        freezer {}
>        blkio {}
> }
> 
> started cgconfig and added to the condor config:
> 
> BASE_CGROUP = htcondor
> CGROUP_MEMORY_LIMIT_POLICY = soft
> 
> Directories such as /sys/fs/cgroup/memory/htcondor and /sys/fs/cgroup/cpu/htcondor were created as expected (including contents). However, when trying to run jobs, messages like this appeared in ProcLog:
> 
> 03/29/15 08:48:07 : Setting cgroup to htcondor/condor_pool_condor_slot1_2@xxxxxxxxxxxxx for ProcFamily 28946.
> 03/29/15 08:48:07 : Unable to create cgroup htcondor/condor_pool_condor_slot1_2@xxxxxxxxxxxxxx  Cgroup functionality will not work: Cgroup, operation not allowed
> 
> The RHEL 7 documentation recommends not using libcgroup as it has been deprecated. Do we need to wait for HTCondor to support cgroups in a systemd compatible way, or is there a known way of getting it to work using libcgroup?
> 
> For the record I'm using HTCondor 8.3.4 on SL7.
> 
> Thanks,
> Andrew.
> 
> 
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