Message 252322 - Python tracker

Message252322

Author	vstinner
Recipients	ezio.melotti, serhiy.storchaka, vstinner
Date	2015-10-05.12:01:28
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1444046488.88.0.905297361267.issue25318@psf.upfronthosting.co.za>
In-reply-to

Content
Attached patch is the first step to optimize Unicode encoders: it adds a _PyBytesWriter API. This API is responsible to use the most efficient buffer depending on the need: * it's possible to use a small buffer directly allocated on the C stack * otherwise a Python bytes object is allocated * it's possible to overallocate the bytes objcet to reduce the number of calls to _PyBytes_Resize() The patch only adds the new API, don't expect any speed up. I just added a small optimization: the overallocation is disabled in UCS1 encoder (ASCII and Latin1) for the last write.

Content

Attached patch is the first step to optimize Unicode encoders: it adds a _PyBytesWriter API. This API is responsible to use the most efficient buffer depending on the need:

* it's possible to use a small buffer directly allocated on the C stack
* otherwise a Python bytes object is allocated
* it's possible to overallocate the bytes objcet to reduce the number of calls to _PyBytes_Resize()

The patch only adds the new API, don't expect any speed up. I just added a small optimization: the overallocation is disabled in UCS1 encoder (ASCII and Latin1) for the last write.

History
Date	User	Action	Args
2015-10-05 12:01:28	vstinner	set	recipients: + vstinner, ezio.melotti, serhiy.storchaka
2015-10-05 12:01:28	vstinner	set	messageid: <1444046488.88.0.905297361267.issue25318@psf.upfronthosting.co.za>
2015-10-05 12:01:28	vstinner	link	issue25318 messages
2015-10-05 12:01:28	vstinner	create