ISA and Jerasure can be compared for the default stripe width (4KB) and
the two most commonly used Reed Solomon matrices. Comparing the
bandwidth for large chunks (1MB) is not relevant because it is not
commonly used.
Signed-off-by: Loic Dachary <ldachary@redhat.com>
Update bench.sh/plot tool to cover ISA backend.
ISA will output a fake echinique 'cauchy_good' so the plot tool
don't need to be changed.
Signed-off-by: Yuan Zhou <yuan.zhou@intel.com>
The ceph_erasure_code_benchmark output is converted into a JSON series
suitable to display in HTML with the http://www.flotcharts.org/
library. A self contained copy of the HTML,JS,CSS files is included for
durability and can be used from the source tree with:
CEPH_ERASURE_CODE_BENCHMARK=src/ceph_erasure_code_benchmark \
PLUGIN_DIRECTORY=src/.libs \
qa/workunits/erasure-code/bench.sh fplot jerasure |
tee qa/workunits/erasure-code/bench.js
and display with:
firefox qa/workunits/erasure-code/bench.html
Signed-off-by: Loic Dachary <loic@dachary.org>
Expand the default suite to enumerate all cases that are relevant to the
current code base so that it is easier to consume. Namely it means
* iterating over object sizes of 4KB (what is used by default) and
1MB (what was previous benchmarked)
* grouping results in series that would make sense to plot to get the
behavior of a given technique for a series of K/M values and all
possible erasures.
Instead of specifying the iterations to run, set the size of the total
data set to be exercised and compute the iterations by dividing it by
the object size. Since the object size varies, it is impractical to
preset the number of iterations and get meaningful results.
The PARAMETERS environment variable is added to enable the caller to
inject --parameter jerasure-variant=generic, for instance.
The packets size is calculated based on the other parameters. The
options are limited when packets are small (4KB) and it would not make a
real difference to give control over it. The packet size is capped to
a maximum of 3100 bytes which is roughly what has been found to be an
optimal value for large packets (1MB).
Signed-off-by: Loic Dachary <loic@dachary.org>
Display benchmark results for the default erasure code plugins, in a tab
separated CSV file. The first two column contain the amount of KB
that were coded or decoded, for a given combination of parameters
displayed in the following fields.
seconds KB plugin k m work. iter. size eras.
1.2 10 example 2 1 encode 10 1024 0
0.5 10 example 2 1 decode 10 1024 1
It can be used as input for a human readable report. It is also intented
to be used to show if a given version of an erasure code plugin performs
better than another.
The last column ( not shown above for brievety ) is the exact command
that was run to produce the result so it can be copy / pasted to
reproduce them or to profile.
Only the jerasure techniques mentionned in
https://www.usenix.org/legacy/events/fast09/tech/full_papers/plank/plank_html/
are benchmarked, the others are assumed to be less interesting.
Signed-off-by: Loic Dachary <loic@dachary.org>
