|
Problem IC78718
|
Status: Closed |
DB2 REPORTS NUMBER OF PROCESSOR CORES WITH INTEL HYPERTHREADING INCORRECTLY |
| product: |
DB2 FOR LUW / DB2FORLUW / 970 - DB2 |
| Problem description: |
DB2 incorrectly counts a core which is Intel HyperThreading as
two cores. It should be counted as 1 core with threading level
of 2 for the purpose of license enforcement. Our license text
explicitly states limits as based on cores rather than Intel
"threads".
Correct output should be
Dual X5560 (2 socket)
CPU: total:16 online:16 Cores per socket:4 Threading degree per
core:2
Instead in db2diag.log it reports
CPU: total:16 online:16 Cores per socket:8 Threading degree per
core:1
This can also be displayed via db2pd -osinfo.
The output we are looking for will be similar to
CPU Information:
TotalCPU OnlineCPU ConfigCPU Speed(MHz) HMTDegree
Cores/Socket
8 8 8 1648 2 n/a |
| Problem Summary: |
****************************************************************
* USERS AFFECTED: *
* DB2 Express-C and DB2 Express users running on hardware with *
* Intel processor(s) that have Hyperthreading *
****************************************************************
* PROBLEM DESCRIPTION: *
* DB2 Express-C and DB2 Express will only use half the *
* physical CPU cores they should, because Hyperthreading will *
* make it look as though the computer has twice as many cores *
* as it actually does. *
****************************************************************
* RECOMMENDATION: *
* Upgrade to DB2 v9.7fp6 *
**************************************************************** |
| Local Fix: |
|
| available fix packs: |
DB2 Version 9.7 Fix Pack 5 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 6 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 7 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 8 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 9 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 9a for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 10 for Linux, UNIX, and Windows
|
| Solution |
|
| Workaround |
not known / see Local fix |
| Timestamps |
Date - problem reported :
Date - problem closed :
Date - last modified :
| 15.09.2011
06.02.2012
06.02.2012 |
| Problem solved at the following versions (IBM BugInfos) |
9.7.FP6
|
| Problem solved according to the fixlist(s) of the following version(s) |
| 9.7.0.5
|
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