[issue4565] io write() performance very slow
New submission from Istvan Albert <[EMAIL PROTECTED]>:
The write performance into text files is substantially slower (5x-8x)
than that of python 2.5. This makes python 3.0 unsuited to any
application that needs to write larger amounts of data.
test code follows ---
import time
lo, hi, step = 10**5, 10**6, 10**5
# writes increasingly more lines to a file
for N in range(lo, hi, step):
fp = open('foodata.txt', 'wt')
start = time.time()
for i in range( N ):
fp.write( '%s\n' % i)
fp.close()
stop = time.time()
print ( "%s\t%s" % (N, stop-start) )
--
components: Interpreter Core
messages: 77132
nosy: ialbert
severity: normal
status: open
title: io write() performance very slow
type: performance
versions: Python 3.0
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<http://bugs.python.org/issue4565>
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[issue4565] io write() performance very slow
Istvan Albert <[EMAIL PROTECTED]> added the comment: Well I would strongly dispute that anyone other than the developers expected this. The release documentation states: "The net result of the 3.0 generalizations is that Python 3.0 runs the pystone benchmark around 10% slower than Python 2.5." There is no indication of an order of magnitudes in read/write slowdown. I believe that this issue is extremely serious! IO is an essential part of a program, and today we live in the world of gigabytes of data. I am reading reports of even more severe io slowdowns than what I saw: http://bugs.python.org/issue4561 Java has had a hard time getting rid of the "it is very slow" stigma even after getting a JIT compiler, so there is a danger there for a lasting negative impression. ___ Python tracker <[EMAIL PROTECTED]> <http://bugs.python.org/issue4565> ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
