On Mon, Jul 12, 1999, Khimenko Victor wrote:
> 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...
Yeah, "magnitude" certainly was the wrong word, of course.
Ralf S. Engelschall
[EMAIL PROTECTED]
www.engelschall.com
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