Re: [Qemu-devel] [PATCH v9 0/7] trace: Optimize per-vCPU TCG tracing states

[Stefan Hajnoczi <stefanha@redhat.com>]

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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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