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
ciao,
Anto
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