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Re: [ccp4bb]: NFS Performance



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On Tuesday 16 April 2002 08:04, Armin Wagner wrote:
>
> check out the linux NFS kernel patches at
> http://www.fys.uio.no/~trondmy/src/2.4.18/

Also note that there may be relevant patches on the Irix end:
  
http://www.lib.uaa.alaska.edu/linux-kernel/archive/2002-Week-14/0765.html


>
>
> On Tue, 16 Apr 2002, Martin Singleton wrote:
> >
> >We have recently started using Linux (RedHat 7.2) machines in our
> > SGI based network.
> >All of our user accounts are held on an NFS exported filesystem from
> > an SGI server. This filesystem is mounted on the Linux machine as
> > well as the other SGIs. Linux sees the filesystem fine, but there
> > appears to be a major performance problem when certain CCP4
> > programs as well as SOLVE on the Linux box requires access to this
> > filesystem. The problem seems to occur during read/writes of large
> > binary files, which cause programs to slow to a crawl, in some
> > cases increasing the run time by two orders of magnitude. I have
> > noticed that the programs processor usage often drops to < 1% when
> > this occurs and the machine rapidly runs out of memory (1GB real!)
> > If the same process is run on the local (ext3) disc only, or on the
> > SGI machines, there are no such problems. Obviously the problem
> > lies with the Linux-IRIX disc cross-mounting, but so far I have not
> > been able to see where, and the documented NFS options do not seem
> > to help. Has anyone else noticed this problem, or suggest any
> > solutions ?
> >

-- 
Ethan A Merritt       merritt@u.washington.edu
Biomolecular Structure Center Box 357742
University of Washington, Seattle, WA 98195
phone: (206)543-1421
FAX:   (206)685-7002