[Bugs] [Bug 1502455] disperse eager-lock degrades performance for file create workloads

bugzilla at redhat.com bugzilla at redhat.com
Mon Oct 16 10:59:40 UTC 2017


--- Comment #3 from Manoj Pillai <mpillai at redhat.com> ---

BTW, I realize that the norm would be to provide performance results as
supporting evidence. I'm currently waiting on some systems to become available,
so can't do that right away. Will do so as soon as I can.

But this problem has been seen multiple times in the past, in customer cases as
well as our internal testing, and this bz has been long pending. So decided to
go ahead and open it to avoid more delays.

(In reply to Xavier Hernandez from comment #2)
> I guess this problem happens when multiple clients are creating files on the
> same directory, right ? otherwise, eager-locking shouldn't interfere with
> file creation (in fact it should be faster).

Yes, with multiple clients. But we have seen degradation even when each client
is creating its data set in its own private directory. Seemed like there was
contention on directories in the path.

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