[Pvfs2-users] Problems with intense parallel i/o via kernel VFS

[Andrew Savchenko]

On Thu, 17 May 2012 17:31:51 +0400 Andrew Savchenko wrote:
> Another thing to consider is CFLAGS and LDFLAGS being used as well
> as compiler version. As you can see I use rather sophisticated flags,
> but they were well tested on the entire system, because all system
> was build using this flags. However, sometimes these optimization
> levels trigger code bugs not seen otherwise, especially memory
> alignment and region's overlap issues. I will try to compile OFS
> without any *FLAGS at all, this will effectively disable all
> optimizations.

And my gcc version is sys-devel/gcc-4.5.3-r2 (-r2 means Gentoo
patchset).
 
> I'll run some test with your configure options and mail results later.
> For now this will be done in 3 variations:
> 
> 1) current server layout will be kept: 15 servers, both data and
> meta, standalone client, all on different hosts;
> 2) 3 servers (both data and meta), 1 client, all on different hosts;
> 3) as above, but on all on a single host. This will involve a shared
> usage of a single local drive, performance may be really bad, so I'm
> not sure this test will be successful.

4) I'll try to use a fuse client instead of a kernel one. This way it
should be clean if bug(s) lays in kernel client only, or may
be somewhere else.

Best regards,
Andrew Savchenko
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