Stefan Hajnoczi writes: > 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 Just to be sure, there's a v11 on the list (this is v9). Cheers, Lluis
