On Mon, Jun 26, 2017 at 06:04:34PM -0400, Emilio G. Cota wrote: > v8: https://lists.gnu.org/archive/html/qemu-devel/2017-06/msg02335.html > > Changes from v8: > > - Rebased on top of the current tracing tree -- the one that includes > Lluis' fix (2c321e3c486). > - Added Lluis' R-b tag. > - Added perf numbers in the commit log of the last patch (tl;dr: no overhead). > > Thanks, > > Emilio > > PS. How to quickly get some linux-user perf numbers: > > I used dbt-bench[1] for a before/after comparison. I added a script to that > repo (breakdown.pl, see below) to make it play well with barchart[2]. > Obtaining a comparison bar chart is quite simple: > > 1. Generate one dbt-bench output file per QEMU checkout, e.g.: > $ git checkout orig && make > [ orig == "before"; new == "after" ] > $ ./dbt-bench.pl /path/to/qemu/build/qemu-x86_64 > orig.out > [ then do the same with orig-disabled, new, etc.] > [...] > $ ls *.out > new-disabled.out new.out orig-enabled.out orig.out > > 2. Call dbt-bench's breakdown.pl script with the --barchart option, then > pipe the output to barchart, and finally pipe to gnuplot: > $ ./breakdown.pl --barchart orig.out orig-enabled.out new.out > new-disabled.out \ > | ../barchart/barchart.pl --extra-gnuplot='set term dumb 140 30' \ > --extra-gnuplot='set title "NBench score; higher is better"' \ > | gnuplot > > Note that barchart is just a front-end for gnuplot >=5, so any valid term will > work (e.g. 'set term pngcairo size 1200,500'). > > [1] https://github.com/cota/dbt-bench > [2] https://github.com/cota/barchart >
Thanks, applied to my tracing tree: https://github.com/stefanha/qemu/commits/tracing Stefan
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