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Re: [Gluster-devel] swapcontest usage in syncio.c
From: |
Jeff Darcy |
Subject: |
Re: [Gluster-devel] swapcontest usage in syncio.c |
Date: |
Tue, 7 Aug 2012 16:45:50 -0400 |
On Tue, 7 Aug 2012 20:13:35 +0200
address@hidden (Emmanuel Dreyfus) wrote:
> Anand Avati <address@hidden> wrote:
> What was behind the decision to use swapcontext, btw? Why not just
> have a thread for each task?
I should probably let the authors speak for themselves, but I suspect
it's because operations like self-heal and rebalance can be expected to
generate a *lot* of sync calls. Threads do still consume non-trivial
resources, and switches between them still involve a trip through the
scheduler, even if they share an address space etc. I just ran a quick
experiment, and ping-ponging between tasks via swapcontext was ~9x as
fast as via pthreads. I didn't measure the effect on memory
consumption, but it's likely to be at least as large as the effect on
execution time.
- Re: [Gluster-devel] swapcontest usage in syncio.c, (continued)
- Re: [Gluster-devel] swapcontest usage in syncio.c, Anand Avati, 2012/08/09
- Re: [Gluster-devel] swapcontest usage in syncio.c, Emmanuel Dreyfus, 2012/08/09
- Re: [Gluster-devel] swapcontest usage in syncio.c, Anand Avati, 2012/08/09
- Re: [Gluster-devel] swapcontest usage in syncio.c, Emmanuel Dreyfus, 2012/08/09
- Re: [Gluster-devel] swapcontest usage in syncio.c, Anand Avati, 2012/08/09
- Re: [Gluster-devel] swapcontest usage in syncio.c, Emmanuel Dreyfus, 2012/08/09
- Re: [Gluster-devel] swapcontest usage in syncio.c, Anand Avati, 2012/08/09
- Re: [Gluster-devel] swapcontest usage in syncio.c, Emmanuel Dreyfus, 2012/08/09
- Re: [Gluster-devel] swapcontest usage in syncio.c, Emmanuel Dreyfus, 2012/08/07
- Re: [Gluster-devel] swapcontest usage in syncio.c, Emmanuel Dreyfus, 2012/08/07
- Re: [Gluster-devel] swapcontest usage in syncio.c,
Jeff Darcy <=
- Re: [Gluster-devel] swapcontest usage in syncio.c, Anand Avati, 2012/08/09