Re: [PATCH] parallelize g++ testing a bit more

[Mike Stump <mikestump@comcast.net>]

On Jun 20, 2011, at 4:06 AM, Rainer Orth wrote:
> I've got a patch to do this, prompted by the use of UltraSPARC-T2
> machines with 8 cores/8 strands which are quite slow on their own:
> 
> 	[build, testsuite, v3] Increase gcc, g++, gfortran and libstdc++-v3 testsuite parallelism
>        http://gcc.gnu.org/ml/gcc-patches/2010-07/msg01633.html
> 
> but haven't yet incorporated Jakub's comments.

Yeah, I would not even consider a patch that was count based.  :-)  Ideally, what you want to do is to bin pack the completed in N seconds in B bins, where B is related to the physical number of cores.  The, there is _no_ extra overhead for subdivision on 1 core, and on 10,000 core, it still works, though, one is going to need slightly better 1 to B code.  Anyone know of a bin packer command line argument?  We don't care if it is slow, because we can bin pack every 10th run, and start with idealized times.  I would have contributed that sort of change a while ago, but didn't spot a bin packer.  I also did up code to pull from a single work list, but, dejagnu isn't structured to do that.  :-(  That would be the best solution, but is much more work.