|
Problem IT21441
|
Status: Closed |
PROCESSOR SPECIFIC OPTIMIZATIONS ARE NOT USED AS EXPECTED |
| product: |
DB2 FOR LUW / DB2FORLUW / B10 - DB2 |
| Problem description: |
Db2 contains processor specific optimizations. They get only
enabled, if a suitable processor gets detected.
While a line like this in db2diag.log can be found that
indicates that DB2 has detected a SSE4 capable CPU:
CPU: total:32 online:32 Cores per socket:8 Threading degree per
core:2 SIMD:Y CPU Features:SSSE3,SSE4
another line in db2diag.log indicates that the CPU optimizations
are effectively not used:
BLU: HW SIMD enabled: SCAN(Y), ARITH(Y), COMP(Y), CPU(1)
That means only SSE2 optimizations are used. |
| Problem Summary: |
****************************************************************
* USERS AFFECTED: *
* All systems with modern CPUs. *
****************************************************************
* PROBLEM DESCRIPTION: *
* See Error Description *
****************************************************************
* RECOMMENDATION: *
* Upgrade Db2. *
**************************************************************** |
| Local Fix: |
|
| available fix packs: |
Db2 Version 11.1 Mod 3 Fix Pack 3 for Linux, UNIX, and Windows
Db2 Version 11.1 Mod3 Fix Pack3 iFix001 for Linux, UNIX, and Windows
Db2 Version 11.1 Mod3 Fix Pack3 iFix002 for Linux, UNIX, and Windows
|
| Solution |
|
| Workaround |
not known / see Local fix |
| Timestamps |
Date - problem reported :
Date - problem closed :
Date - last modified :
| 14.07.2017
21.07.2017
21.07.2017 |
| Problem solved at the following versions (IBM BugInfos) |
|
| Problem solved according to the fixlist(s) of the following version(s) |
