[erlang-patches] patch to add option to set schedulers by percentage
Thu Aug 22 16:11:54 CEST 2013
Have you given any thoughts on what should happen if you chain multiple
+SP commands? i.e.
erl +S 16:16 +SP 50:50 +SP 50:50
Our view right now is that this should give [8:8] and not [4:4] as it
currently does in the patch.
Related to this we also do not think that the order to +S vs +SP
commands should matter. i.e.
erl +S 16:16 +SP 50:50 +S 16:16
should give [8:8] and not [16:16].
What do you think? These things are for sure odd cases to think about,
but if it is possible someone will for sure do it....
On 21/08/13 15:45, Steve Vinoski wrote:
> For applications where measurements show enhanced performance from the
> use of a non-default number of emulator scheduler threads, having to
> accurately set the right number of scheduler threads across multiple
> hosts each with different numbers of logical processors is difficult
> because the erl +S option requires absolute numbers of scheduler
> threads and scheduler threads online to be specified.
> To address this issue, this patch adds a +SP option to erl, similar to
> the existing +S option but allowing the number of scheduler threads
> and scheduler threads online to be set as percentages of logical
> processors configured and logical processors available, respectively.
> For example, "+SP 50:25" sets the number of scheduler threads to 50%
> of the logical processors configured, and the number of scheduler
> threads online to 25% of the logical processors available.
> erlang-patches mailing list
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