Executor thread - cpu affinity not working

[matteo-gsr]

Hi,

I am using the embedded C media driver in dedicated threading mode and I am setting a CPU affinity on each of the conductor, sender and receiver threads.

It seems there's an aeron_executor thread which doesn't get the affinity. It looks like it's spawn by the conductor agent. However, it's not getting the same affinity.

It is problematic given it then ends up on the same isolated core of the critical thread, which I really don't want to.

[vyazelenko]

Fixed with ae665d9.

There is now a separate configuration option to set CPU affinity for the async executor thread, i.e. via aeron.driver.async.executor.cpu.affinity property or AERON_DRIVER_ASYNC_EXECUTOR_CPU_AFFINITY env variable.

[matteo-gsr]

thank you very much @vyazelenko !

[matteo-gsr]

@vyazelenko - sorry to revive this thread. Is it possible to add the setter methods to set the affinity, similar to other existing setter methods in the C driver? They are necessary when interacting with FFI, as we cannot change the context struct directly.

e.g.

https://github.com/aeron-io/aeron/blob/master/aeron-driver/src/main/c/aeron_driver_context.c#L3085

Ideally, one would have the setters for these members:

• set_sender_cpu_affinity_no
• set_receiver_cpu_affinity_no
• set_conductor_cpu_affinity_no
• set_async_executor_cpu_affinity_no

Thank you.