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82 lines
2.7 KiB
82 lines
2.7 KiB
4 months ago
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Kernbench v0.42
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What is this?
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This is a cpu throughput benchmark originally devised and used by Martin J.
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Bligh. It is designed to compare kernels on the same machine, or to compare
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hardware. To compare hardware you need to be running the same architecture
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machines (eg i386), the same userspace binaries and run kernbench on the same
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kernel source tree.
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It runs a kernel at various numbers of concurrent jobs: 1/2 number of cpus,
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optimal (default is 4xnumber of cpus) and maximal job count. Optionally it can
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also run single threaded. It then prints out a number of useful statistics
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for the average of each group of runs and logs them to kernbench.log
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You need more than 2Gb of ram for this to be a true throughput benchmark or
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else you will get swapstorms.
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Ideally it should be run in single user mode on a non-journalled filesystem.
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To compare results it should always be run in the same kernel tree.
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How do I use it?
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You need a kernel tree (any 2.6 will do) and the applications 'time', 'awk',
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'date' and 'yes' installed. 'time' is different to the builtin time used by
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BASH and has more information desired for this benchmark.
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Simply cd into the kernel tree directory and type
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/path/to/kernbench
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Options
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kernbench [-n runs] [-o jobs] [-s] [-H] [-O] [-M] [-h] [-v]
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n : number of times to perform benchmark (default 5)
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o : number of jobs for optimal run (default 4 * cpu)
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s : perform single threaded runs (default don't)
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H : don't perform half load runs (default do)
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O : don't perform optimal load runs (default do)
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M : don't perform maximal load runs (default do)
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f : fast run
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h : print this help
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v : print version number
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Changelog:
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v0.42 Fixed incorrect counting of cpus (thanks Flynn Marquardt)
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Changed -j to at least 4GB ram.
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v0.41 Fixed make oldconfig
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v0.40 Made all runs use the oldconfig if it exists. Changed to only do one
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warmup run before all the benchmarks. Added logging to kernbench.log
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Cleaned up the code substantially to reuse code where possible.
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Added standard deviation statistics courtesy of Peter Williams
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v0.30 Added fast run option which bypasses caching, warmup and tree
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preparation and drops number of runs to 3. Modified half loads to
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detect -j2 and change to -j3. Added syncs. Improved warnings and
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messages.
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v0.20 Change to average of runs, add options to choose which runs to perform
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remove single threaded run from defaults, do warmup run, lots more
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sanity checks, drop meaningless runs, add a few warnings, remove fudge
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factor from no. of jobs.
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v0.11 First public release
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Thanks: M. Bligh for ideas. Others for help with magic incantations to get
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BASH to work.
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Con Kolivas <kernbench@kolivas.org>
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Mon Jun 18 18:59:24 2007
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License:
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GPL of course. Read COPYING included in this tarball.
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