Message 310454 - Python tracker

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Author	vstinner
Recipients	YoSTEALTH, ned.deily, nitishch, njs, pitrou, vstinner
Date	2018年01月23日.00:53:31
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1516668811.91.0.467229070634.issue31368@psf.upfronthosting.co.za>

Content
Explanation for myself. https://kernelnewbies.org/Linux_4.14#Asynchronous_buffered_I.2FO_support "In this release, the preadv2(2) syscall with RWF_NONBLOCK will let userspace applications bypass enqueuing operation in the threadpool if it's already available in the pagecache." For applications using a thread pool, like the aiofiles does for asyncio, preadv2() allows to bypass the thread pool which is obviously faster. If the read block, just uses thread pool as currently done. Same rationale for pwritev2().

Content

Explanation for myself.
https://kernelnewbies.org/Linux_4.14#Asynchronous_buffered_I.2FO_support
"In this release, the preadv2(2) syscall with RWF_NONBLOCK will let userspace applications bypass enqueuing operation in the threadpool if it's already available in the pagecache."
For applications using a thread pool, like the aiofiles does for asyncio, preadv2() allows to bypass the thread pool which is obviously faster. If the read block, just uses thread pool as currently done.
Same rationale for pwritev2().

History
Date	User	Action	Args
2018年01月23日 00:53:31	vstinner	set	recipients: + vstinner, pitrou, ned.deily, njs, YoSTEALTH, nitishch
2018年01月23日 00:53:31	vstinner	set	messageid: <1516668811.91.0.467229070634.issue31368@psf.upfronthosting.co.za>
2018年01月23日 00:53:31	vstinner	link	issue31368 messages
2018年01月23日 00:53:31	vstinner	create

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