Mailinglist Archive: opensuse (908 mails)

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Re: [opensuse] apache 2.4 performance issue / processwire.
On Thu, 2016-06-09 at 23:15 +0200, Per Jessen wrote:
Anton Aylward wrote:
from the caching that PHP may or may not be doing between
HTTP invocations (probably not, this is a connectionless protocol
remember) there should be inode and pathname caching done by the kernel.

Yeah, that is an interesting point.

What cacheing can the kernel do? The filesystem is multi-hosted (at
least in possibility) yes? So surely the kernel has to go right back to
the filesystem every time to make sure it gets current state
information.

What atime setting does the filesystem have? Anything other than noatime
will definitely require the kernel to go right back to the disk blocks
at least some of the time.

The bug report describes what PHP does; there's lots of discussion of
the cacheing it does and doesn't do. In particular it does cache between
[HTTP] requests, because as it says what's the point of a cache
otherwise.

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