Re: [creduce-dev] parallel tuning

[John Regehr <regehr@cs.utah.edu>]

Eric I would love to see updated numbers.

But also, I think it's most friendly to provide a good default for the 
common case of a single-socket Core-i7, not some quad-socket monster 
Xeon thing.

John


On 11/17/15 4:20 PM, Eric Eide wrote:
> John Regehr <regehr@cs.utah.edu> writes:
>
> > - parallelism 2 on a dual core
> > - 3 on a 4-core
> > - 4 on a >4 core
> > How does this match with your experience?
>
> I haven't really experimented with this.
>
> I do think, though, that limiting parallelism to 4 is probably not a good
> idea.
>
> I used to run C-Reduce on Emulab's d820's, which have 32 physical cores and
> 128GB RAM.  With 32 tests in parallel, C-Reduce was plenty snappy.  I can't
> imagine it would run as fast with only 4 tests in parallel, but I admit I did
> not test this.
>
> (Of course, I *could* test this, for some given set of reductions, but not
> today.  Today I need to focus on something else.)
>
> Eric.