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Re: is anyone using threaded automake?

From: Ralf Wildenhues
Subject: Re: is anyone using threaded automake?
Date: Sun, 1 Nov 2009 18:37:35 +0100
User-agent: Mutt/1.5.20 (2009-08-09)

Hi Jason,

* Jason Sewall wrote on Sun, Nov 01, 2009 at 06:28:31PM CET:
> On Sun, Nov 1, 2009 at 6:45 AM, Ralf Wildenhues wrote:
> >
> > Is anyone using it?  Has anyone seen issues with it?
> I didn't even know it existed, but I just tried it out and it seems to
> generate correct output for a project I have with 12
> files. I have a quad core machine and set AUTOMAKE_JOBS=4.
> The performance gains are fairly small, however:
> $ AUTOMAKE_JOBS=1 time automake
> 1.31user 0.19system 0:01.51elapsed 100%CPU
> $ AUTOMAKE_JOBS=4 time automake
> 1.62user 0.24system 0:01.14elapsed 163%CPU

Yeah, the perl thread spawning really has high overhead, and the output
synchronization isn't all that performant either.  I did get quite
acceptable speedup out of a 150-makefile project.

> And they are imperceptible with autoreconf.

Oh well.

Thanks for testing,

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