Difference between revisions of "Splot"
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=== Help ===
=== Help ===
Revision as of 07:22, 21 October 2010
splot is available from hackage: http://hackage.haskell.org/package/splot
splot - a tool for visualizing the lifecycle of many concurrent multi-stage processes. See http://www.haskell.org/haskellwiki/Splot Usage: splot [-o PNGFILE] [-w WIDTH] [-h HEIGHT] [-bh BARHEIGHT] [-tf TIMEFORMAT] [-tickInterval TICKINTERVAL] -o PNGFILE - filename to which the output will be written in PNG format. If omitted, it will be shown in a window. -w, -h - width and height of the resulting picture. Default 640x480. -bh - height of the bar depicting each individual process. Default 5 pixels. Use 1 or so if you have a lot of them. -tf - time format, as in http://linux.die.net/man/3/strptime but with fractional seconds supported via %OS - will parse 12.4039 or 12,4039 -tickInterval - ticks on the X axis will be this often (in millis). Input is read from stdin. Example input (speaks for itself): 2010-10-21 16:45:09,431 >foo green 2010-10-21 16:45:09,541 >bar green 2010-10-21 16:45:10,631 >foo yellow 2010-10-21 16:45:10,725 >foo red 2010-10-21 16:45:10,930 >bar blue 2010-10-21 16:45:11,322 <foo 2010-10-21 16:45:12,508 <bar
'>FOO COLOR' means 'start a bar of color COLOR on track FOO', '<FOO' means 'end the current bar for FOO'.
> cat <<END |splot -tickInterval 100 2010-10-21 16:45:09,431 >foo green 2010-10-21 16:45:09,541 >bar green 2010-10-21 16:45:10,631 >foo yellow 2010-10-21 16:45:10,725 >foo red 2010-10-21 16:45:10,930 >bar blue 2010-10-21 16:45:11,322 <foo 2010-10-21 16:45:12,508 <bar
And here's what we get:
A couple of real-world examples:
(several thousand processes calling memcached; stages are: green is "connecting", yellow is "reading data", red is "retrying after a network error")
Running 160 approx.equal-length tasks on a 160-core cluster.