[erlang-questions] Changing scheduler behaviour to make tests less deterministic

Chris Newcombe <>
Thu Dec 28 17:01:39 CET 2006


Cool.  Would you consider adding maybe a '+Q nnnn' option to allow
setting CONTEXT_REDS dyamically?   (The 'Q' would be mnemonic for
'quantum' as in scheduler quantum of course.)

Many thanks,

Chris

On 12/27/06, Rickard Green <> wrote:
> As of R11B-3 there will be a "modified timing" command line argument
> to erl (+T). It will be possible to modify the timing more or less.
> It will (most likely) do the following:
>
> * spawn/spawn_link/spawn_opt will schedule out the parent process
>   and with "heavier modified timing" force the parent to sleep
>   for a while. (Among the few SMP bugs we have found in our Erlang
>   code, most of them have been bugs where the code depended on the
>   parent doing some initialization before the child began
>   executing.)
> * A fixed amount of reductions will be bumped as soon as a process
>   is scheduled in.
>
> BR,
> Rickard Green, Erlang/OTP



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