IDS Forum

Physical Processor to Virtual processor mapping.

Posted By: Thirugnanam, Kannan
Date: Friday, 16 November 2007, at 3:14 p.m.

Hello Everyone,

We had recently retired one of the cluster nodes and are running the two
Informix instances in the same node. We have also added additional CPUs
to this node.

Solaris version 9

IDS version 9.40 FC4

mpstat

CPU minf mjf xcal intr ithr csw icsw migr smtx srw syscl usr sys wt
idl

0 96 0 266 282 180 438 2 20 18 0 989 1 2 0
97

1 11 0 75 185 163 883 20 16 29 0 495 14 4 0
81

2 5 0 40 46 1 930 41 12 23 0 90 19 4 0
77

3 13 0 52 22 1 739 17 14 20 0 478 13 3 0
84

8 82 0 217 10 1 626 6 16 19 0 719 9 3 0
89

9 26 0 165 989 973 400 3 9 24 0 108 6 5 0
89

10 13 0 107 897 893 203 1 7 61 0 264 4 4 0
92

11 18 0 111 7 4 135 1 11 9 0 1060 3 1 0
96

16 107 0 529 46 22 373 1 12 14 0 830 1 4 0
95

17 28 0 360 43 40 305 0 8 12 0 448 0 2 0
98

18 14 0 172 4 1 224 0 8 7 0 233 0 1 0
99

19 20 0 99 106 103 72 0 18 9 0 255 0 1 0
99

Instance 1 CPU Affinity in onconfig

VPCLASS CPU,num=9,aff=1-17,noage

Instance 2 CPU Affinity in onconfig

VPCLASS CPU,num=2,aff=18-19,noage

When I run a heavy transaction in Instance 2, I don't see the CPUs 18
and 19 utilized. Most likely it is utilizing the first two CPUs. Sun OS
sees the CPUs as (0, 1, 2, 3, 8, 9, 10, 11, 16, 17, 18, 19). I would
like to know how an Informix instance sees the CPUs. Does it see it as
Sun Os sees or does it see the CPUs as (0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
10, 11).

Previously I had Instance 1 configured as "VPCLASS
CPU,num=9,aff=1-11,noage".

If anyone could share their insight, it will be deeply appreciated.

Thank you,

Kannan Thirugnanam

Software Architect

(941) 378-7213

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Messages In This Thread

• Physical Processor to Virtual processor mapping.
  Thirugnanam, Kannan -- Friday, 16 November 2007, at 3:14 p.m.
  • Re: Physical Processor to Virtual processor mappin
    Art Kagel -- Sunday, 18 November 2007, at 9:46 a.m.
    • RE: Physical Processor to Virtual processor ma....
      Thirugnanam, Kannan -- Monday, 19 November 2007, at 10:48 a.m.

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