How to measure performance?
davecb at canada.sun.com
Mon Oct 4 12:39:05 GMT 1999
Peter J. Holzer wrote:
| This is not enough. Many applications do not read and write files
Yes, but that's probably too much to ask Ms. Vologdin
to do on the first go-round...
| 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 (;-))
| and also for MS-Word (which only ever loads the part
| you are currently editing), but also for MS-Excel which does load
| save a whole spread-sheet at once, but reads and writes the file in
| seemingly random order (which is much slower).
| There are test suites like the BapCo suite which run the actual
| applications (but we couldn't find much difference between a local
| and one shared over 10 Mbit ethernet, so at least Bapco is probably
Actually, oplocks cause local caching of the files,
so the non-sequential accesses are mostly to local disk.
That's possibly what fools bapco.
[Andrew has a newish load-generation suite, specifically for
SMB: I expect folks will eventually start using and reporting
based on it...]
Simple models and simple benchmarks aren't good for comparison,
but in the presence of oplocks, can do a good job solving simple
David Collier-Brown, | Always do right. This will gratify some people
185 Ellerslie Ave., | and astonish the rest. -- Mark Twain
Willowdale, Ontario | http://java.science.yorku.ca/~davecb
Work: (905) 415-2849 Home: (416) 223-8968 Email: davecb at canada.sun.com
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