[gambit-list] News

Marc Feeley feeley at iro.umontreal.ca
Tue May 10 08:32:17 EDT 2016


Your machines will be useful for testing the SMP Gambit out.  I’m also looking into a Knights Landing 72 core machine for testing scalability.

Marc

> On May 7, 2016, at 12:47 PM, Bradley Lucier <lucier at math.purdue.edu> wrote:
> 
> On 05/02/2016 12:30 PM, Marc Feeley wrote:
>> Recently Gambit has seen a few noteworthy changes…
>> 
>> As a necessary step on the path to a SMP Gambit, the garbage collector is being parallelized so that multiple OS threads can participate in the garbage collection.  The GC is still stop the world (i.e. the main program stops while the GC is working), but because the work is done in parallel the pause time can be expected to be less.  An experiment with a 7M heap on a 2.6 GHz i7, gives a GC time of 4 milliseconds when a single thread is used and 1 millisecond when 4 threads are used.  The linear speedup in this experiment is encouraging… it remains to be tested in a wide variety of situations to see if speedups are this good in general.  The parallel GC isn’t enabled by default and it requires a special setup to be run.  I will inform the ML as soon as a generally usable version is available, probably in the next few weeks.
> 
> 
> Sounds good.  I have a few 20-core/40-thread machines just rarin' to go.
> 
> Brad
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