How to measure performance?
Peter J. Holzer
hjp at wsr.ac.at
Mon Oct 4 15:19:18 GMT 1999
On 1999-10-04 08:39:05 -0400, David Collier-Brown wrote:
> Peter J. Holzer wrote:
> | This is not enough. Many applications do not read and write files
> | sequentially.
> Yes, but that's probably too much to ask Ms. Vologdin
> to do on the first go-round...
Ok, maybe not for a first go-round, but one should be prepared to see
significantly lower performance in real life than in simplistic
benchmarks. The recipy given sounds like it could build good traces for
a benchmark, but I seriously doubt it does.
> | his is evident for MS-Access (which reads and writes
> | single records),
> I'm on the record as recommending one never try to run
> a multi-user database against a remote filesystem: search
> for "free sample of crack cocaine" in the archives (;-))
I agree completely, but our users don't :-(
> | There are test suites like the BapCo suite which run the actual
> | applications (but we couldn't find much difference between a local
> | disc and one shared over 10 Mbit ethernet, so at least Bapco is
> | probably more CPU-bound).
> Actually, oplocks cause local caching of the files,
> so the non-sequential accesses are mostly to local disk.
> That's possibly what fools bapco.
Actually, the tests we did were against 1.9.16, which didn't support
oplocks (Don't ask why we haven't upgraded to a newer version yet - it's
> [Andrew has a newish load-generation suite, specifically for
> SMB: I expect folks will eventually start using and reporting
> based on it...]
Sounds interesting. Is it on the samba web site? I couldn't find it.
_ | Peter J. Holzer | Nobody should ever have to be
|_|_) | Sysadmin WSR / Obmann LUGA | ashamed if they have a secret love
| | | hjp at wsr.ac.at | for writing computer programs that
__/ | http://wsrx.wsr.ac.at/~hjp/ | actually work. -- Donald E. Knuth
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