Re: [condor-users] Extremely fast execution of java jobs!!!

["Leighton Weymouth" <bob@xxxxxxxxxxx>]

AHHHH..... that could be it.... could be the params that condor passes to
the jvm... I can't remember what they are off the top of my head.... but I
do remember something about setting the memory size....

I can't check now.... it will have to wait until tomorrow.... but that could
well be it!!!

I also remember reading somewhere that the jvm puts a cap on it's memory
usage... so maybe when I run it via the command line with no args, it only
uses say 32MB RAM, but condor may set it to use say 64MB ram, hence the
speed increase???

I'll let you know if this is the case tomorrow.

Cheers.

----- Original Message -----
From: "Matt Hope" <Matt.Hope@xxxxxxxx>
To: <condor-users@xxxxxxxxxxx>
Sent: Wednesday, May 19, 2004 11:44 PM
Subject: RE: [condor-users] Extremely fast execution of java jobs!!!


> are you running with a different jvm and/or tuning parameters?
>
> > -----Original Message-----
> > From: owner-condor-users@xxxxxxxxxxx
> > [mailto:owner-condor-users@xxxxxxxxxxx]On Behalf Of Leighton Weymouth
> > Sent: 19 May 2004 14:41
> > To: condor-users@xxxxxxxxxxx
> > Subject: Re: [condor-users] Extremely fast execution of java jobs!!!
> >
> >
> > > Just brainstorming, here are some ideas as to why it might
> > be faster:
> > >
> > > - The machines in your Condor pool might simply have faster
> > cpu/memory/disk
> > > than your desktop machine.  Trying logging directly into
> > one and running
> > > your job.
> >
> > Tried that... I am running condor on a lab of computers at
> > Charles Sturt
> > Uni, Australia... all the computers are the same... If I run
> > it on one of
> > those computers NOT through condor... my job takes about 4 minutes to
> > run.... If I run it through condor... about 1 minute!!!! Now
> > that is really
> > good... but it just doesn't make sense!!!
> >
> > > - If you job produces a lot of output, it will run
> > considerably faster
> > > sending its output to a file than to the terminal.  (Scrolling a big
> > > graphic display can be expensive.)  Try timing both of those cases.
> >
> > I figured this might be the case... so I ran the same job but
> > took out all
> > the printing to screen...... same result... 4 minutes out of
> > condor one
> > minute with condor.
> >
> > > - On your desktop machine, you might be writing your output to a
> > distributed
> > > file system, which can be considerably slower than using a
> > local disk.
> > > For example, if your /home directory is stored on NFS and
> > /tmp is a local
> > > disk, then "myprog > /home/bob/output" can be considerably
> > slower than
> > > "myprog > /tmp/output".
> >
> > Nope... that is defianatly not the case... all running of the
> > local disk
> > (Windows XP).
> >
> > > Those are just some ideas...
> > > Let us know what you discover.
> >
> > Thanks Doug... I'll just have to keep guessing.... but at the
> > end of the
> > day... I'm not going to stress about it.... It's running my
> > job 4 times as
> > fast :)
> >
> > Cheers.
> >
> >
> > Condor Support Information:
> > http://www.cs.wisc.edu/condor/condor-support/
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> >
> >
>
>
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