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List:       fuse-devel
Subject:    Re: [fuse-devel] stat performance on multicore systems: measurements
From:       Stefan Westerfeld <stefan () space ! twc ! de>
Date:       2012-07-25 16:12:45
Message-ID: 20120725161245.GA19515 () space ! twc ! de
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   Hi!

On Fri, Jul 20, 2012 at 07:28:51PM -0400, Nikolaus Rath wrote:
> Stefan Westerfeld <stefan-a6oftRWAzlp7BRZiorVuVg@public.gmane.org> writes:
> > As promised, I've created a test program that supports my theory that on
> > multicore systems, fuse performance for stat() and other calls could be
> > improved by scheduling the filesystem code that implements stat() and the
> > userspace process that calls stat() on the same cpu.
> [...]
> 
> > #### without cpu affinity ####
> >
> > same  cpu (%)     0.00
> > other cpu (%)   100.00
> > ----------------------
> > stat calls/s  23025.13
> >
> > #### with cpu affinity ####
> >
> > same  cpu (%)   100.00
> > other cpu (%)     0.00
> > ----------------------
> > stat calls/s  44334.30
> 
> Similar results here:
> 
> [...]
> 
> Implementing this in FUSE seems like a worthwhile optimization point.

Ok, I'll try to create a patch against FUSE to get this speedup.

   Cu... Stefan
-- 
Stefan Westerfeld, Hamburg/Germany, http://space.twc.de/~stefan

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