[Pvfs2-users] PVFS2 on BlueGene

[Nathan Poznick]

Thus spake Matthew Woitaszek:
> The file is created on the PVFS2 filesystem and has a zero-byte size. We've
> run the tests with 512 tasks on 256 nodes, and it successfully created a
> 8589934592-byte file. Going to 257 nodes fails.

It very well may have nothing to do with it (the error message doesn't
seem like what you'd get), but it's suspiciously close to the TCP
backlog setting in bmi-tcp.c.

In src/io/bmi/bmi_tcp/bmi_tcp.c, about line 350:

    TCP_BACKLOG = 256,

If you can change that value and recompile, it should be fairly easy to
test if that's the problem you're hitting.  As I said before though,
you'd expect that to manifest in a different way, perhaps a connection
refused error or somesuch.

-- 
Nathan Poznick <kraken at wang-fu.org>

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