Messages in this thread | | | Date | Thu, 9 Mar 2000 02:05:37 +0100 (CET) | From | Nicolas MONNET <> | Subject | Re: Linux responsiveness under heavy load |
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On Wed, 8 Mar 2000, Alan Cox wrote:
|> If I remember properly, MySQL does not use mmaped files yet; if it would, |> would that make a difference? Currently it may just be busy copying |> buffers (I don't know how much of it is a userland issue vs. kernel |> space). | |When your I/O subsystem can do 100Mbytes/second sustained then maybe, but |with the PC of today - wildly improbable.
I understand this; I mentioned earlier that in my case, MySQL isn't even swapping (300MB physical memory vs. 45MB db).
Top reports ~10Mb free and 60MB used as buffer.
I don't know linux internals well enough; but what happens when an app is busy read'ing / seek'ing a file as opposed to reading it mmaped when such a file is small enough to reside in memory? Does'nt this case make a difference?
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