[phobos] State of std.parallelism unit tests

[Brad Roberts]

One thought, change the code to use more threads than you have cpu's.  Not 
as a permanent change, but to encourage more timing randomization.

On Fri, 3 Jun 2011, David Simcha wrote:

> Date: Fri, 03 Jun 2011 18:24:51 -0400
> From: David Simcha <dsimcha at gmail.com>
> Reply-To: Discuss the phobos library for D <phobos at puremagic.com>
> To: Discuss the phobos library for D <phobos at puremagic.com>
> Subject: Re: [phobos] State of std.parallelism unit tests
> 
> Ok, I left the unit tests running in a loop on my home computer all day while
> I was at work.  They ran about 13,000 times without failing once.  Something
> about your setup is enabling the failures or at least making them drastically
> more likely.
> 
> On 6/3/2011 3:05 AM, Jonathan M Davis wrote:
> > On 2011-06-02 23:52, Jonathan M Davis wrote:
> > > On 2011-06-02 06:30, David Simcha wrote:
> > > > Thanks.  A second look with fresher eyes revealed a subtle but serious
> > > > bug in the ResubmittingTasks base mixin (which affects parallel foreach,
> > > > map and amap) and a relatively minor corner-case bug in reduce().  Both
> > > > were introduced after the 2.053 release as a result of over-aggressive
> > > > optimizations.  I've checked in fixes for these.  I'm not sure whether
> > > > they're the root cause of the issues you're seeing, though.  If it's not
> > > > too much work, please try to reproduce your bugs again.
> > > Well, I have yet to see the failure again. Unfortunately, that doesn't
> > > guarantee anything given the intermittent nature of the failure, but I
> > > think that there's a good chance that it's been fixed. I'll post about it
> > > if it happens again, but I think that for the moment, we can assume that
> > > it's been fixed.
> > I take that back. It just happened again. The std.parallelism tests
> > segfaulted.
> > 
> > - Jonathan M Davis
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> > 
> 
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