On 09/07/13 01:41, Antonio Cuni wrote:
Hello Eleytherios,
On 07/04/2013 08:12 AM, Antonio Cuni wrote:
Il giorno 03/lug/2013 18:17, "Amaury Forgeot d'Arc" <[email protected]
<mailto:[email protected]>> ha scritto:
> This is because of I/O.
> If I replace the file with a custom class which has an empty
write() method,
> pypy is twice faster than CPython.
Few days ago I discovered that there is an easy optimization for this.
If you
look at how str2charp & friends are implemented, you see that we do an
RPython
loop and copy char by char.
By contrast, things like string concatenation are implemented using
memcpy and
are much faster (like 3-4 times, iirc).
Sorry if I don't give more precise pointer, but I'm on my mobile phone
:-)
could you try to rerun your benchmark on the improve-str2charp branch
please?
The benchmarks on speed.pypy.org shows some important speedup in e.g.
twisted_tcp or raytrace_simple, which seems to contain a lot of write
I/O, so it might help your case as well:
http://speed.pypy.org/comparison/?exe=1%2BL%2Bdefault%2C1%2BL%2Bimprove-str2charp&ben=1%2C34%2C27%2C2%2C25%2C3%2C46%2C4%2C5%2C41%2C42%2C22%2C44%2C6%2C39%2C7%2C8%2C45%2C23%2C24%2C9%2C10%2C47%2C48%2C49%2C50%2C51%2C11%2C12%2C13%2C40%2C14%2C15%2C35%2C36%2C37%2C38%2C16%2C52%2C54%2C55%2C53%2C56%2C28%2C30%2C32%2C29%2C33%2C17%2C18%2C19%2C20%2C43&env=1&hor=true&bas=1%2BL%2Bdefault&chart=normal+bars
The times that we got with improve-str2charp, are a little worse than
the previous nightly build that i had tried with in my previous email. I
have rerun the benchmark and the times (best of 3 runs) are:
CPython 2.7.3: 14.173 sec
PyPy nightly 3/7/2013: 32.105 sec
PyPy improve-str2charp: 34.044 sec
Regards,
l.
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