12-Jul-99 15:36 you wrote:
> On Mon, Jul 12, 1999, Jeffrey Burgoyne wrote:
>> Any idea of what performance gain to expect? We get about 15000 real hits
>> a day, about 60000 total (including graphics). About 10% of those are SSL.
>> I need to justify why we want to make the change to the web server and
>> even a rough idea is all my employers need to see.
> I've still not seen any benchmarks, but the shared memory based session cache
> is certainly a magnitude faster then the disk-I/O dependent DBM based session
> cache, of course.
Why so ? Any decent OS will keep this file in memory so you'll get just a few
additional syscalls and few memory moves... Disk will be usually touched only
when connection will be served :-) Of course in case of inactivity DBM file
will be pushed out of page cache but shared memory can be pushed in swap in
such case as well ! Of course MM is faster but magnitude... Hardly...
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