Re: aio: questions with ioctx_alloc() and large num_possible_cpus()

[Mauricio Faria de Oliveira]

Hi Benjamin,

On 10/05/2016 02:41 PM, Benjamin LaHaise wrote:
> I'd suggest increasing the default limit by changing how it is calculated.
> The current number came about 13 years ago when machines had orders of
> magnitude less RAM than they do today.

Thanks for the suggestion.

Does the default also have implications other than memory usage?
For example, concurrency/performance of as much aio contexts running,
or if userspace could try to exploit some point with a larger number?

Wondering about it because it can be set based on num_possible_cpus(),
but that might be really large on high-end systems.

Regards,

--
Mauricio Faria de Oliveira
IBM Linux Technology Center