One-shot semantics in GHC event manager

Ben Gamari bgamari.foss at
Tue Oct 21 23:22:18 UTC 2014

Kazu Yamamoto <kazu at> writes:

> Hi,
Hi Kazu,

>>> Andreas - want me to go ahead and get you some hardware to test Ben's
>>> patch in the mean time? This way we'll at least not leave it hanging
>>> until the last moment...
>> I will also try this with two 20-core machines connected 10G on
>> Monday.
> I measured the performace of GHC head, 7.8.3 and 7.8.3 + Ben's patch
> set.
> Server: witty 8080 -r -a -s +RTS -N<n> *1
Have you noticed that witty will sometimes terminate (with exit code 0)
spontaneously during a run? This seems to happen more often with higher
core counts. I've seen this both with and without my patch (based on
master as of earlier today).


- Ben

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