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Date: Fri, 25 Sep 2009 08:53:46 +0900
From: sat <takeuchi_satoru@...fujitsu.com>
To: lkml <linux-kernel@...r.kernel.org>,
Con Kolivas <kernel@...ivas.org>
CC: Ingo Molnar <mingo@...e.hu>, Peter Zijlstra <peterz@...radead.org>,
Raistlin <raistlin@...ux.it>
Subject: massive_intr on CFS, BFS, and EDF
Hi,
I tried massive_intr, a process scheduler's fairness and throughtput testing
program for massive interactive processes, on vanilla 2.6.31, 2.6.31-bfs211
(with BFS) and 2.6.31-edf(latest linus tree + EDF patch).
CFS and BFS look good. CFS has better fairness, and BFS has better throughput.
EDF looks unfair and is unstable. I tested 3 times and the tendency was the
same.
NOTE:
- BFS patch is applied to 2.6.31, but EDF patch is applied to latest linus
tree, so they can't compare strictly. This report is just FYI.
- EDF kernel shows some strange behavior as follows:
* aptitude(debian package management tool) stacks on the way
* oocalc doesn't start
- I dont't subscribe lkml now. So if you reply, pleas CC me.
Thanks,
Satoru
===============================================================================
[ test envinronment ]
A laptop machine with x86_64 dual core CPU
[ test program ]
# CFS and BFS:
$ massive_intr 30 30
# EDF
$ schedtool -E -d 100000 -b 25000 -e ./massive_intr 30 30
It means running 30 interactive processes simultaneously for 30 secs.
Full description of this program is on the comments of source code.
URL:
http://people.redhat.com/mingo/cfs-scheduler/tools/massive_intr.c
[ test result ]
+---------------+-----------+---------+---------+---------+-----------+
| kernel | scheduler | avg(*1) | min(*2) | max(*3) | stdev(*4) |
+---------------+-----------+---------+---------+---------+-----------+
| 2.6.31 | CFS | 246 | 240 | 247 | 1.3 |
| 2.6.31-bfs211 | BFS | 254 | 241 | 268 | 7.1 |
+---------------+-----------+---------+---------+---------+-----------+
| 2.6.31-edf(*5)| EDF | 440 | 154 | 1405 | 444.8 |
+---------------+-----------+---------+---------+---------+-----------+
*1) average number of loops among all processes
*2) minimum number of loops among all processes
*3) maximum number of loops among all processes
*4) standard deviation
*5) EDF kernel hanged up on the way. The data is only among 7 threads.
High average means good throughput, and low stdev means good fairness.
[raw data]
# vanilla 2.6.31 (CFS)
sat@...ian:~/practice/bfs$ uname -r
2.6.31
sat@...ian:~/practice/bfs$ ./massive_intr 30 30
003873 00000246
003893 00000246
003898 00000240
003876 00000245
003888 00000245
003870 00000245
003882 00000247
003890 00000245
003872 00000245
003880 00000246
003895 00000246
003892 00000246
003878 00000246
003874 00000246
003896 00000246
003897 00000246
003884 00000246
003891 00000246
003894 00000246
003871 00000246
003886 00000247
003877 00000246
003879 00000246
003889 00000246
003881 00000246
003899 00000244
003887 00000247
003875 00000247
003885 00000247
003883 00000247
# 2.6.31-bfs211
sat@...ian:~/practice/bfs$ uname -r
2.6.31-bfs211
sat@...ian:~/practice/bfs$ ./massive_intr 30 30
004143 00000248
004127 00000241
004154 00000252
004145 00000255
004137 00000251
004148 00000263
004135 00000261
004153 00000247
004132 00000250
004146 00000248
004140 00000251
004130 00000245
004138 00000267
004136 00000249
004139 00000262
004141 00000255
004147 00000251
004131 00000253
004150 00000254
004152 00000254
004129 00000253
004142 00000242
004151 00000268
004128 00000263
004134 00000260
004144 00000252
004133 00000254
004149 00000265
004126 00000252
004125 00000246
# 2.6.31-edf (latest linus tree + edf patch)
sat@...ian:~/practice/bfs$ uname -r
2.6.31-edf
sat@...ian:~/practice/bfs$ schedtool-edf/schedtool -E -d 100000 -b
25000 -e ./massive_intr 30 30
Dumping mode: 0xa
Dumping affinity: 0xffffffff
We have 3 args to do
Dump arg 0: ./massive_intr
Dump arg 1: 30
Dump arg 2: 30
003915 00000541
003914 00001405
003916 00000310
003924 00000177
003923 00000154
003917 00000280
003918 00000211
# <kernel hunged up here>
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