Re: [HTCondor-users] ProportionalSetSize not populated in recent Htcondor versions

[Ram Ban <ramban046@xxxxxxxxx>]

Hello Todd,Â

Thanks for your replyÂ

In this wouldn't RSS would be too much shown in case there is a lot of shared memory across threads? Does Htcondor 25 already handle that?

Thanks and RegardsÂ

Raman

On Thu, Apr 2, 2026, 02:27 Todd Tannenbaum <tannenba@xxxxxxxxxxx> wrote:

On 3/31/2026 1:33 PM, Ram Ban wrote:

Hi all,

I have updated my some systems from htcondor version 10.0.8 to 25.0.7 few months back.

I have recently noticed that ProportionalSetSize is not being populated in JobClassAds, even when on executes USE_PSS=true is given. It was present in old htcondor version

Is this expected or I have to change some settings for it?

Thanks and RegardsÂ

Raman

Hi Raman,

Are you launching the HTCondor Execution Point (EP, i.e. the condor_startd etc) on Linux as root (i.e. at bootup via systemd) ?

If yes, my suspicion about what changed here:

IIRC, in HTCSS 10.x default memory usage was tracked by the "condor_procd" daemon running on the EP. This daemon would periodically poll each process belonging to the job and sum up RSS, PSS, etc. In HTCSS 25.x, the EP will use Linux kernel control groups ("cgroups") to track memory utilization by default if it is launched with root access. Linux cgroups do not support reporting PSS, thus in HTCSS 25.x you likely just see ResidentSetSize (RSS) and MemoryUsage (which defaults to be the same as RSS).Â

I strongly suggest you stick with the defaults in HTCSS 25.x, and go with "MemoryUsage" as the attribute for memory (RAM) usage info. Having the kernel track this information via cgroups is more accurate and also better at detecting/stopping jobs that use too much memory quickly before bad things happen. However, if you really insist on having PSS information, I could share configuration to tell HTCSS to not use cgroups and instead return to using the condor_procd like happened in HTCSS v10. But I do not recommend this.

Hope this helps,
Todd