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RE: Parallel builds across makefiles

From: Gardell, Steven
Subject: RE: Parallel builds across makefiles
Date: Sun, 17 Jul 2016 19:22:21 +0000

No I have not gotten to 4.2.1 yet. 

I have experimented using j values ranging from 16 to 64. The majority of the 
testing is with -Otarget. But I have tried all of them.

-----Original Message-----
From: Paul Smith [mailto:address@hidden 
Sent: Sunday, July 17, 2016 3:14 PM
To: Gardell, Steven <address@hidden>; address@hidden
Subject: Re: Parallel builds across makefiles

On Sun, 2016-07-17 at 15:48 +0000, Gardell, Steven wrote:
> OK. Thanks! I will try the latest version.
> FWIW, I am measuring is total wall clock time to complete the build.
> (date; gmake... ; date) This goes up substantially with all sync modes 
> other than "none" if gmake has parallel invocations of sub-makes going 
> (e.g. "gmake  -f SomeOtherMakefile").  When I am only parallelizing 
> individual makefiles (with ACE, these tend to be simple lists of files 
> to compile), then the behavior is as promised by the documentation.

Assuming you determine the behavior exists even in version 4.2.1, please 
provide more details.  What level of -j are you using?  Which sync mode are you 
using?  Do you get the same behavior even with lower levels of -j, if yours is 
very large?

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