Message 336648 - Python tracker

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Author	methane
Recipients	desbma, giampaolo.rodola, methane
Date	2019-02-26.11:24:02
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1551180242.66.0.153545614395.issue36103@roundup.psfhosted.org>
In-reply-to

Content
> Also on Linux "echo 3 \| sudo tee /proc/sys/vm/drop_caches" is supposed to disable the cache. As I said already, shutil is not used only with cold cache. If cache is cold, disk speed will be upper bound in most cases. But when cache is hot, or using very fast NVMe disk, syscall overhead can be non-negligible.

> Also on Linux "echo 3 | sudo tee /proc/sys/vm/drop_caches" is supposed to  disable the cache.

As I said already, shutil is not used only with cold cache.

If cache is cold, disk speed will be upper bound in most cases.
But when cache is hot, or using very fast NVMe disk, syscall overhead
can be non-negligible.

History
Date	User	Action	Args
2019-02-26 11:24:02	methane	set	recipients: + methane, giampaolo.rodola, desbma
2019-02-26 11:24:02	methane	set	messageid: <1551180242.66.0.153545614395.issue36103@roundup.psfhosted.org>
2019-02-26 11:24:02	methane	link	issue36103 messages
2019-02-26 11:24:02	methane	create