Message 77814 - Python tracker

Message77814

Author	pitrou
Recipients	christian.heimes, pitrou
Date	2008-12-14.18:18:29
SpamBayes Score	0.0005579022
Marked as misclassified	No
Message-id	<1229278711.0.0.240635346547.issue4663@psf.upfronthosting.co.za>
In-reply-to

Content
Simply bumping TextIOWrapper._CHUNK_SIZE from 128 to 1024 yields some significant performance improvements. ./python -m timeit -s "f=open('LICENSE')" "f.seek(0)" "for line in f: pass" -> with 128: 6.21 msec per loop -> with 1024: 3.41 msec per loop ./python -m timeit -s "f=open('LICENSE')" "f.seek(0)" "while f.read(100): pass" -> with 128: 4.03 msec per loop -> with 1024: 1.25 msec per loop Is there any counter-indication to doing so?

Content

Simply bumping TextIOWrapper._CHUNK_SIZE from 128 to 1024 yields some
significant performance improvements.

./python -m timeit -s "f=open('LICENSE')" "f.seek(0)" "for line in f: pass"
 -> with 128: 6.21 msec per loop
 -> with 1024: 3.41 msec per loop

./python -m timeit -s "f=open('LICENSE')" "f.seek(0)" "while
f.read(100): pass"
 -> with 128: 4.03 msec per loop
 -> with 1024: 1.25 msec per loop

Is there any counter-indication to doing so?

History
Date	User	Action	Args
2008-12-14 18:18:31	pitrou	set	recipients: + pitrou, christian.heimes
2008-12-14 18:18:30	pitrou	set	messageid: <1229278711.0.0.240635346547.issue4663@psf.upfronthosting.co.za>
2008-12-14 18:18:30	pitrou	link	issue4663 messages
2008-12-14 18:18:29	pitrou	create