Messages in this thread | | | From | "Stephen C. Tweedie" <> | Date | Thu, 15 Jul 1999 12:56:20 +0100 (BST) | Subject | Re: Clearing the I/O caches? (for benchmark tests) |
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Hi,
On 14 Jul 1999 16:42:47 -0700, tmk@cse.ucsc.edu (Tom M. Kroeger) said:
> In any case the memory exhausting approach still cleared far more > space than sys_sync & invalidate_buffers etc... (are these buffers > taken from ext2 when memory becomes very low?) Any idea as to why?
Of course it will. Invalidating buffers etc. won't do anything about the page cache. A memory flush will also flush out the page cache very effectvely.
> You said ext2 keeps "recently-accessed bitmap buffers pinned", can > I just wait 30 second ( or however long) and then re-run the test?
No. The last 8 inode and bitmap buffers accessed are pinned forever (or until a different buffer evicts one from the cache).
--Stephen
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