William Lee Irwin III wrote:
On Thu, May 17, 2007 at 07:26:38PM -0400, Bill Davidsen wrote:
I have posted the results of my initial testing, measuring IPC rates
using various schedulers under no load, limited nice load, and heavy
load at nice 0.
http://www.tmr.com/~davidsen/ctxbench_testing.html
Kernel compiles are not how to stress these. The way to stress them is
to have multiple simultaneous independent chains of communicators and
deeper chains of communicators.
Kernel compiles are little but background cpu/memory load for these
sorts of tests.
Just so. What is being quantified is the rate of slowdown due to
external load. I would hope that each IPC method would slow by some
similar factor.
... Something expected to have some sort of mutual
interference depending on quality of implementation would be a better
sort of competing load, one vastly more reflective of real workloads.
For instance, another set of processes communicating using the same
primitive.
The original intent was purely to measure IPC speed under no load
conditions, since fairness is in vogue I also attempted to look for
surprising behavior. Corresponding values under equal load may be useful
in relation to one another, but this isn't (and hopefully doesn't claim
to be) a benchmark. It may or may not be useful viewed in that light,
but that's not the target.
Perhaps best of all would be a macrobenchmark utilizing a variety of
the primitives under consideration. Unsurprisingly, major commercial
databases do so for major benchmarks.
And that's a very good point, either multiple copies or more forked
processes might be useful, and I do intend to add threaded tests on the
next upgrade, but perhaps a whole new code might be better for
generating the load you suggest.
--
Bill Davidsen <[email protected]>
"We have more to fear from the bungling of the incompetent than from
the machinations of the wicked." - from Slashdot
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