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In sysbench version 0.4, the tmp variable used by the memory test to
execute requests is optimized by the compiler. Caching mechanism reduces
the direct accesses to the memory increasing the transfer speed. This
leads to false timing estimations that considerably affect read and
also random write operations.
In sysbench version 1, this issue is fixed adding the volatile modifier
to the tmp variable. This prevents compiler optimizations forcing a direct
access to the memory.
The final result is a realistic transfer speed measurement.
Signed-off-by: massimo toscanelli <massimo.toscanelli@leica-geosystems.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>
(cherry picked from commit 59cce5ad1603c2975684ae15b639e0e3cd688c40)
Signed-off-by: Armin Kuster <akuster808@gmail.com>
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Signed-off-by: Peter Kjellerstedt <peter.kjellerstedt@axis.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
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Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
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The project used to be hosted on Sourceforge, then Launchpad, and it moved to
Github. The last stable release (0.4.12) cannot be found on Sourceforge anymore,
and is not available (as tarball) on github. So using the tarball from Launchpad
instead. We can move to github when the next release happens (which will be the
first one from github).
Tested with and without mysql, with and without aio.
Signed-off-by: Nicolas Dechesne <nicolas.dechesne@linaro.org>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
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