On Mon, 6 Jul 2020 13:53:18 +0200 SeongJae Park <sjpark@xxxxxxxxxx> wrote:
> From: SeongJae Park <sjpark@xxxxxxxxx>
>
> Currently, 'wss' treats every region as working set if accessed at least
> once. Someone who want to know performance important working set only
> would want to ignore regions having low access frequency. '--thres'
> option can be used to set the minimal access frequency of the regions to
> be classified as the workingset.
>
> Using this, users can plot the reuse histogram. For example:
>
> $ damo record $(pidof raytrace)
> $ for t in {1..20}; do ./tools/damon/damo report wss --thres $t | \
> grep avr | awk -v reuse_time=$(( (21 - t) * 5 )) \
> '{print reuse_time " " $3}'; done
> 100 12838416
> 95 2222623
> 90 1585480
> 85 422890
> 80 67040
> 75 45218
> 70 13242
> 65 12896
> 60 12136
> 55 10872
> 50 9648
> 45 8136
> 40 7052
> 35 6304
> 30 5736
> 25 5404
> 20 5305
> 15 5187
> 10 5069
> 5 4873
>
> Above command shows the reuse histogram of parsec3.raytrace. Remind
> that the sampling interval and aggregation interval are 5ms and 100ms
> by default and this command used the default values. So, the above
> output means that about 12MB of memory region was reused within 100 ms
> while only about 2MB of memory region was reused within 95 ms, then
> about 1.5MB within 90ms, and so on, in average.
>
> Signed-off-by: SeongJae Park <sjpark@xxxxxxxxx>
> ---
> tools/damon/wss.py | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/tools/damon/wss.py b/tools/damon/wss.py
> index b43065176cfd..d2a1b149e3ea 100644
> --- a/tools/damon/wss.py
> +++ b/tools/damon/wss.py
> @@ -17,6 +17,8 @@ def set_argparser(parser):
> parser.add_argument('--range', '-r', type=int, nargs=3,
> metavar=('<start>', '<stop>', '<step>'),
> help='range of wss percentiles to print')
> + parser.add_argument('--thres', '-t', type=int, metavar='<# accesses>',
> + help='minimal number of accesses for treated as working set')
> parser.add_argument('--sortby', '-s', choices=['time', 'size'],
> help='the metric to be used for the sort of the working set sizes')
> parser.add_argument('--plot', '-p', type=str, metavar='<file>',
> @@ -67,7 +69,7 @@ def main(args=None):
> wss = 0
> for p in snapshot:
> # Ignore regions not accessed
> - if p[1] <= 0:
> + if p[1] < args.thres:
Oops, I forgot giving default value for the option. I will set it as 1 in the
next spin.
Thanks,
SeongJae Park
> continue
> wss += p[0]
> wss_dist.append(wss)
> --
> 2.17.1
>
>
>
