Re: [Qemu-devel] [RFC PATCH 3/3] qemu-coroutine: use a ring per thread for the pool

[Paolo Bonzini]

On 28/11/2014 12:21, Peter Lieven wrote:
> Am 28.11.2014 um 12:14 schrieb Paolo Bonzini:
>>> master:
>>> Run operation 40000000 iterations 12.851414 s, 3112K operations/s, 321ns 
>>> per coroutine
>>>
>>> paolo:
>>> Run operation 40000000 iterations 11.951720 s, 3346K operations/s, 298ns 
>>> per coroutine
>> Nice. :)
>>
>> Can you please try "coroutine: Use __thread … " together, too?  I still
>> see 11% time spent in pthread_getspecific, and I get ~10% more indeed if
>> I apply it here (my times are 191/160/145).
> 
> indeed:
> 
> Run operation 40000000 iterations 10.138684 s, 3945K operations/s, 253ns per 
> coroutine

Your perf_master2 uses the ring buffer unconditionally, right?  I wonder
if we can use a similar algorithm but with arrays instead of lists...

Paolo