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Operating Systems Linux Doubt about programs for testing Linux performance Post 302328900 by MarkSeger on Thursday 25th of June 2009 12:00:25 PM
Old 06-25-2009
I think one of the biggest mistakes people make when testing is to time the test from start to finish and not pay attention to anything in between. For example, I always use netperf to measure network performance, or dt to measure disk as well as others, BUT I always run collectl in another window to see what's happening to my cpu, disk, network, memory and other subsystems while the test is in process. If you get an bad end-to-end number, and the intermediate numbers are very erratic it just may be a system or network switch is misconfigured. Looking at the elapsed time or average load will never give you a true picture.

In fact, if you run collectl with a monitoring interval of 0.1 seconds or even less which doing disk tests you can actually watch the cache fill as the tests run faster at first.

-mark
 

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GTESTER(1)							   User Commands							GTESTER(1)

NAME
gtester - test running utility SYNOPSIS
gtester [OPTION...] [testprogram] DESCRIPTION
gtester is a utility to run unit tests that have been written using the GLib test framework. When called with the -o option, gtester writes an XML report of the test results, which can be converted into HTML using the gtester-report utility. OPTIONS
-h, --help print help and exit -v, --version print version information and exit --g-fatal-warnings make warnings fatal -k, --keep-going continue running after tests failed -l list paths of available test cases -m=MODE run test cases in MODE, which can be one of: perf run performance tests slow, thorough run slow tests, or repeat non-deterministic tests more often quick do not run slow or performance tests, or do extra repeats of non-deterministic tests (default) undefined run test cases that deliberately provoke checks or assertion failures, if implemented (default) no-undefined do not run test cases that deliberately provoke checks or assertion failures -p=TESTPATH only run test cases matching TESTPATH -s=TESTPATH skip test cases matching TESTPATH --seed=SEEDSTRING run all test cases with random number seed SEEDSTRING -o=LOGFILE write the test log to LOGFILE -q, --quiet suppress per test binary output --verbose report success per testcase SEE ALSO
gtester-report(1) GLib GTESTER(1)
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