[pypy-dev] pypy performance ramp up

[Matti Picus]

On 03/04/15 00:54, Cheng Chen wrote:
> Hey pypy-devs,
>
> Thanks a lot for you amazing work for pypy!
>
> I have a naive question regarding pypy's performance, I was doing some 
> performance testing with pypy, at first i was using a sample size of 
> 9000, our script was able to process this batch in 2.8 sec, which 
> gives us a rate of 3200/s, which we thought was somewhat slow. Then we 
> changed to a sample size of 1 million, the speed was as slow initially 
> but soon ramped up and stabilized at around 40k/s which is more than 
> enough for us.
>
> I am just curious what cause the performance ramp up, thanks a lot!
>
> Cheng
>
>
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Hi. Thanks for trying it. Our 'tracing JIT' traces your function and 
only after a while decides that that location is "hot" enough to 
optimize. We call this the JIT warmup, see 
http://pypy.readthedocs.org/en/latest/faq.html#how-fast-is-pypy.

Also 
http://morepypy.blogspot.co.il/2009/03/applying-tracing-jit-to-interpreter.html 
for a backrounder from 2009
Matti