[torqueusers] pbs_mom question?

Dave Jackson jacksond at clusterresources.com
Fri Sep 9 16:20:09 MDT 2005


Garrick,

  Are you making CVS changes?  We are starting patch 7 today.  But, at
least I beat you and got the first patch in!

Dave

On Fri, 2005-09-09 at 14:13 -0700, Garrick Staples wrote:
> On Thu, Sep 08, 2005 at 01:28:39AM +0400, Alexander Zubkov alleged:
> > Hi. A have a couple of questions about pbs_mom.
> > 
> > 1) Is it important for pbshome of pbs_mom to be keep its state between 
> > reboots? For example, if I have diskless nodes and want to put it in 
> > temporary filesystem, that resides in memory (ex. ramfs or tmpfs in linux)?
> 
> There are per-job state files, job output files, and log files.  It
> would be prefered to maintain the job files between reboots, you can
> probably get by without it.  The importance of log files is obviously up
> to you.
> 
> The output files don't have to be spooled in pbshome, see qsub's -k
> option.
> 
>  
> > 2) How musch "disk" space do pbs_mom occupy in pbshome? I found that it 
> > copies there stdin and stores stdout and stderr of a program. What else 
> > it keeps there? How much space it needs (or some exponent estimation if 
> > some)? Or there something else that can grow very big depending on some 
> > conditions?
> 
> The state files are pretty small, only 3 or 4KB per job.  At loglevel 0,
> log files don't get very much.
> 
>  
> > I need it to know to choose between to possibilities of placing pbshome 
> > on diskless nodes:
> > - occupy some memory of the node for tempopary file system
> > - make personal nfs-mounted dir for every node
> 
> I haven't done it, but I'd say some sort of memory-base filesystem is
> certainly doable for pbs_mom.
> 
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