Dear Iñigo Martinez Lasala，
Thank you for your replay and advice.
My
company is a software application vendor, and our customer is
useing PostgreSQL 8.1.3.
When our application is runing
, the DB sluggish suddenly and application stop.
To prove that
it is not the problem of the application ,We need some evidence to certified
this version have problem and show to our customer.
And Can I ask you several questions?
1、 Can you recreate the "Context-switch
storm" in the your old version PostgreSQL 8.1.15
?
2、 If you can ,could you please
tell me your test case ？
Thank you so much！
Best regards,
Ray Huang
发件人: Iñigo Martinez Lasala
[mailto:imartinez@xxxxxxxxxxxx]
发送时间: 2010年5月28日 15:43
收件人: 黄永卫
抄送: pgsql-admin
主题: Re: About "Context-switch storm" problem
Hi, Yongwei
We finally upgraded our database server to last PostgreSQL 8.2 available.
Since 8.2 does not include any major change (8.3 does indeed a lot of them) we
had no problem with this upgrade. And believe, our database was really complex.
About 600 tables with 300 stored procedures, wide use of embedded functions
from different packages (including tsearch2) and lot of triggers and views. Not
problems at all.
Migrating to 8.3 or 8.4 is another history. So, my recommendation is to migrate
to 8.2.17
-----Original Message-----
From: 黄永卫
<yongwei.huang@xxxxxxxxx>
To: imartinez@xxxxxxxxxxxx
Subject: About
"Context-switch storm" problem
Date: Fri, 28 May 2010 13:31:54
+0800
Hello，Iñigo Martinez Lasala !
I read your mail about “Context-switch storm in 8.1.15” from postgres website.
I think I meet the same problem as you now .
Recently my company’s postgres
DB server sluggish suddenly with a hight Context-switching value as below:
2010-04-07 04:03:15
procs
memory
swap io system
cpu
2010-04-07 04:03:15 r
b swpd free buff cache
si so bi bo
in cs us sy id wa
2010-04-07 14:04:27 3
0 0 2361272 272684 3096148
0 0 3 1445 973
14230 7 8 84 0
2010-04-07 14:05:27 2
0 0 2361092 272684 3096220
0 0 3 1804 1029 31852 8
10 81 1
2010-04-07 14:06:27 1
0 0 2362236 272684 3096564
0 0 3 1865 1135 19689
9 9 81 0
2010-04-07 14:07:27 1
0 0 2348400 272720 3101836
0 0 3 1582 1182 149461 15 17
67 0
2010-04-07 14:08:27 3
0 0 2392028 272840 3107600
0 0 3 3093 1275 203196 24 23
53 1
2010-04-07 14:09:27 3
1 0 2386224 272916 3107960
0 0 3 2486 1331 193299 26 22
52 0
2010-04-07 14:10:27 34
0 0 2332320 272980 3107944
0 0 3 1692 1082 214309 24 22
54 0
2010-04-07 14:11:27 1
0 0 2407432 273028 3108092
0 0 6 2770 1540 76643 29 13
57 1
2010-04-07 14:12:27 9
0 0 2358968 273104 3108388
0 0 7 2639 1466 10603 22
6 72 1
I
May I know your solution after that ?
Thank you !
Best wishes,
Ray Huang
