Re: [PATCH 09/14] perf diff: Update perf diff documentation for multiple data comparison

Namhyung Kim
2012-11-29T11:52:21Z

On Wed, 28 Nov 2012 14:52:44 +0100, Jiri Olsa wrote:
> +COMPARISON
> +----------
> +The comparison is governed by the baseline file. The baseline perf.data
> +file is iterated for samples. All other perf.data files specified on
> +the command line are searched for the baseline sample pair. If the pair
> +is found, specified computation is made and result is displayed.
> +
> +All samples from non-baseline perf.data files, that do not match any
> +baseline entry, are displayed with empty space within baseline column
> +and possible computation results (delta) in their related column.
> +
> +Example files samples:
> +- file A with samples f1, f2, f3, f4, f6
> +- file B with samples f2, f4, f5
> +- file C with samples f1, f2, f5
> +
> +Example output:
> + x - computation takes place for pair
> + b - baseline sample percentage
> +
> +- perf diff A B C
> +
> + baseline/A compute/B compute/C samples
> + ---------------------------------------
> + b x f1
> + b x x f2
> + b f3
> + b x f4
> + b f6
> + x x f5
> +
> +- perf diff B A C
> +
> + baseline/B compute/A compute/C samples
> + ---------------------------------------
> + b x x f2
> + b x f4
> + b x f5
> + x x f1
> + x f3
> + x f6
> +
> +- perf diff C B A
> +
> + baseline/C compute/B compute/A samples
> + ---------------------------------------
> + b x f1
> + b x x f2
> + b x f5
> + x f3
> + x x f4
> + x f6
> +

It seems not work this way. When I test multiple diff, I didn't get
consecutive 'b's on the baseline column like your example in the cover
letter of this series.

Thanks,
Namhyung