New submission from Lefteris Stamatogiannakis <[email protected]>:
Reading a file in pypy can be up to ~2x slower than CPython.
Antonio Cuni mentioned that it may be a problem with the low level
implementation of pypy:
On 4/7/2013 9:12 am, Antonio Cuni wrote:
"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)."
Example code:
f=open("text.txt", "w+b")
s="qwerty" * 10 + '\n'
for i in xrange(100000):
f.write(s)
----------
messages: 5905
nosy: estama, pypy-issue
priority: performance bug
status: unread
title: I/O in pypy is up to 2x slower than CPython
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<https://bugs.pypy.org/issue1528>
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