DragonFly BSD
DragonFly bugs List (threaded) for 2009-10
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Re: many processes stuck in "hmrrcm", system unusable

From: "Justin C. Sherrill" <justin@xxxxxxxxxxxxxxxxxx>
Date: Sun, 4 Oct 2009 21:09:00 -0400 (EDT)

On Sun, October 4, 2009 1:29 pm, Matthew Dillon wrote:

>     I would much rather work on the clustering, but if people are going
>     to constantly complain about HAMMER's performance I will have to take
>     2-3 months and deal with this issue first I guess.

Before we have Matt, who can work full-time on clustering - the _purpose
of this project_ - digress for months on filesystem performance, can we
quantify the actual problem?

Corecode's report is the only one we have, and we don't have a realistic
test scenario that measures when it happens or how much it happens.  I've
been running pkgsrc bulk builds on Hammer disks for quite a while now, and
I have not seen any noticeable change in overall run time from using UFS
to using Hammer.  Chasing a heisenbug can be very difficult.

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