It all depends whether or not you are using security, and what level of
security. It also depends whether or not you are measuring the first WS
call, or subsequent ones.
From my experience, here is the kind of performance you can expect to
get between 1 client and 1 service.
1st call subsequent calls (on
the same stub)
no security 100s ms ~ 1+ sec 10ms ~ 100ms, depending on CPU speed
security 1~10 secs 100ms~500ms, depending on
CPU speed
High latency can also add to these numbers, if the two hosts are not on
the same network. From our observations, the client side seems to be
more CPU intensive that service side, so if you are running 1 client to
1 service, I would put the more powerful CPU on the client side.
The one thing to keep in mind, is that you can fit a lot of information
in a WS call before you start to see slowdowns in the numbers. That
means that the cost to send a WS message with a single int as a value,
and the cost to send a WS message that has an array of 10s of complex
objects is about the same. You can also get a lot of parallelism going,
many times handling dozens of concurrent WS calls without any impact on
the per WS call performance.
Just to get an idea, on a dual Xeon 3GHz machine we use for testing, we
can get between 50 and 500 WS calls per second, depending on the
security level used; these numbers are reached when we are able to
saturate the GT service container, and that happens when we have about
16~32 nodes concurrently generating WS calls. Some of these numbers are
present in a recent paper of ours
http://people.cs.uchicago.edu/~iraicu/publications/2007_SC07_Falkon.pdf.
Cheers,
Ioan
soumaya marzouk wrote:
Hi,
I tried to call the add operation of the first Math Service examples.
I find that it takes about 5second to be executed in local using a
1,7GHz centrino processor and 1Go of RAM.
Could you explain this long latency and how could I improve this time.
Thank you.
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--
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Ioan Raicu
Ph.D. Candidate
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Distributed Systems Laboratory
Computer Science Department
University of Chicago
1100 E. 58th Street, Ryerson Hall
Chicago, IL 60637
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Email: [EMAIL PROTECTED]
Web: http://www.cs.uchicago.edu/~iraicu
http://dev.globus.org/wiki/Incubator/Falkon
http://www.ci.uchicago.edu/wiki/bin/view/VDS/DslCS
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