Re: [HTCondor-users] swap space

[almudena.montiel@xxxxxx]

I only started monitoring thoroughly the swap usage from yesterday.

Our ganglia tells us about the swap usage, but doesn't say which  
process is consuming that.

Since yesterday I am monitoring that, and I see that the tomcat  
process (which runs the CREAM-CE) consumes 16G RAM, by itself, but no  
swap space.

I understand the condor_schedd and condor_collector are consuming swap  
space because they don't have enough memory left.

Cheers

MÃtyÃs Selmeci <matyas@xxxxxxxxxxx> escribiÃ:

> Is that memory usage normal? The CHTC central manager
> (collector+negotiator) only has 8G of RAM and 16G of swap, and swap is
> barely used at all.
>
> -Mat
>
> On 11/20/18 10:15 AM, Almudena Montiel wrote:
> > Thanks Dimitri
> >
> > Yes, in the worker nodes we do have 3G per core in average, some
> > nodes have 4G per core.
> >
> > I was asking for requirements of the server where the htcondor
> > central daemons are running. We have all the central services of
> > htcondor running in a single server. I was referring to this server
> > in my previous mails.
> >
> > Thanks and regards,
> >
> > almudena
> >
> >
> > On 20/11/18 17:05, Dmitri Maziuk via HTCondor-users wrote:
> > > On Tue, 20 Nov 2018 14:34:09 +0100
> > > Almudena Montiel <almudena.montiel@xxxxxx> wrote:
> > >
> > > > As for SWAP, we have increased it to 48G. Hopefully that will be
> > > > fine.
> > > Well the longer answer is if you have to swap, your performance
> > > will go down the drain even if you gon't get as far as thrashing.
> > > E.g. we run BLAST, it memory-maps its search database in ~2GB
> > > chunks, we tried running it with less than 2GB RAM per slot, it
> > > went to swap and the jobs took days to complete -- too long to suit
> > > our requirements. So all our workers have 2GB RAM per core (slot)
> > > or more now.



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Almudena Montiel Gonzalez              e-mail: almudena.montiel@xxxxxx
Systems Manager
Dept. Theoretical Physics. Block 15.
Laboratory of High Energy Physics
Universidad Autonoma de Madrid.
Phone: 34 91 497 4541      Fax: 34 91 497 3936
James Watt 2, Cantoblanco, 28049 Madrid, Spain.
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