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From: Rolf Campbell <thats DOT unpossible AT gmail DOT com>
Subject: Re: hyperthreading fix, try #1
Date: Mon, 07 Feb 2005 10:57:06 -0500
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References: <cu714p$3ge$1 AT sea DOT gmane DOT org> <GCEBKEBLOHKOGJEBHNNEMEPIGEAB DOT vbandke AT bsp-gmbh DOT com>
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Volker Bandke wrote:
>  
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> Rolf,
> 
> a)  	Your test case fails on my machine as well, right at the
> beginning
> 
> b)	I seem to remember that there was/is a separate problem with "make
> - -j", even on non-hyperthreasd machines.  Unfortunately I cannot
> search the mailing list right now due to some error (that possibly
> has to do with cygwin.com's earlier breakdown.  I do remember a
> sentence somewhere like "We don't recommend that you use 'make -j' as
> it seems to be broken"
> 
> c)	Running your testcase with '-j1' instead of '-j2' does not fail on
> my machine

Thanks for you info Volker.  Here's what I've figured out:

This test does fail (in the same way) on non-hyperthreaded machines 
(Win2000Pro on a PIII).  But, this is a regression from 1.5.12 (that 
test runs fine on the non-HT machine with 1.5.12.  There was (maybe 
still is) a problem with running "make -j" without the max task counter, 
but "make -j2" has always worked very well on non-ht machines.

I will try out some other snapshots and see if I can narrow down the 
time when this showed up later today.

-Rolf


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