[erlang-questions] Improve performance of IO bounded server written in Erlang via having pollset for each scheduler and bind port to scheduler together with process

Ronny Meeus <>
Wed Jul 11 22:35:36 CEST 2012


On Wed, Jul 11, 2012 at 9:12 PM, Zabrane Mickael <> wrote:
> Hi Wei,
>
> On Jul 11, 2012, at 2:35 PM, Wei Cao wrote:
>
> sure, the steps is correct
>
>
> I re-installed everything from scratch with your second patch and tested
> your ehttpd web server example.
>
> before: ~55K rps
> after: ~70K rps
>
> but was unable to reach the 100K rps.
>
> Anyone courageous enough to help us reach the 100K rps?
>
> Regards,
> Zabrane
>
>
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> 
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>

I think the feature that certain processes can be bound to a certain
CPU at application level would also be useful.
The solution implemented here only works (if I understand it well)
when a process is using socket communication.

There are scenarios where tasks are using just a little load (for
example short processing of a message) where the overhead introduced
by the scheduler is large so that nothing is gained by switching to a
multi-core processor (in fact single core runs much faster).
If certain the processes can be grouped on application level and bound
to specific cores, the application scales a lot better.
The other solution would be to run a separate VM instance per core but
I have the feeling that this is more complex to manage and that there
is also more overhead if messages need to be sent between the
applications running on different VMs.

This is a "taskset" like primitive that we know it from the Linux thread world.
For example in thread "Strange observation running in an SMP
environment." in this mailing list this would certainly be beneficial.

Best regards,
Ronny



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