Re: fast interprocess communication ?

[Armin Steinhoff <armin@steinhoff.de>]

Hi Prady,

Pradyumna Sampath wrote:
> Hi Armin,
>
> On Wed, Jun 30, 2010 at 1:33 PM, Armin Steinhoff <armin@steinhoff.de> wrote:
>
>   
>> what are you using if you need a "real fast"  interprocess communication ?
>>     
>
> Does the posix mqueue's not fit your need ? 

The mqueue system is based on the file system and isn't the fastest.
The concept of mqueue is OK ...

> Have you tried them ? Do
> have some kind of numbers about your definition of fast ?
>   

Local message exchange between lokal processes in less than 10us.

> For me, the POSIX mqueues seemed to work, though with some initial
> trouble which was fixed with a patch to the kernel follow this thread
> ( http://lkml.org/lkml/2010/4/2/293 ) , this patch is now queued for
> mainline inclusion for 2.6.35.
>
> There is also a new test suite to measure message queue perf in the
> rt-tests. Its called pmqtest.
>   

Interesting ... I will give it a try.

I plan do some conceptual work for a UIO based message passing solution.
It should be possible to use read and write (triggering 
uio_event_notify() ) and a UIO device memory to implement a non-copy 
data exchange.

Regards

--Armin