Thinking Out Loud

April 13, 2018

Check 12.1.0.2 Alert Log For HugePages Usage

Filed under: 12c — mdinh @ 11:23 pm

What! Another post on hugepages – seriously?

+ grep 'Dump of system resources acquired for SHARED GLOBAL AREA' -B1 -A22 database alert log
+ tail -25
2018-04-13T09:40:23.908633-07:00
Dump of system resources acquired for SHARED GLOBAL AREA (SGA) 

2018-04-13T09:40:23.916573-07:00
 Per process system memlock (soft) limit = UNLIMITED
2018-04-13T09:40:23.920591-07:00
 Expected per process system memlock (soft) limit to lock
 SHARED GLOBAL AREA (SGA) into memory: 2996M
2018-04-13T09:40:23.928517-07:00
 Available system pagesizes:
  4K, 2048K 
2018-04-13T09:40:23.936717-07:00
 Supported system pagesize(s):
 
2018-04-13T09:40:23.943044-07:00
  PAGESIZE  AVAILABLE_PAGES  EXPECTED_PAGES  ALLOCATED_PAGES  ERROR(s)
2018-04-13T09:40:23.947112-07:00
     2048K             2303            1498            1498        NONE
2018-04-13T09:40:23.951899-07:00
 Reason for not supporting certain system pagesizes: 
2018-04-13T09:40:23.960107-07:00
  4K - Large pagesizes only
2018-04-13T09:40:23.965247-07:00

====================================================================================================

Tue Apr 10 12:29:13 2018
Dump of system resources acquired for SHARED GLOBAL AREA (SGA) 

Tue Apr 10 12:29:13 2018
 Per process system memlock (soft) limit = 128G
Tue Apr 10 12:29:13 2018
 Expected per process system memlock (soft) limit to lock
 SHARED GLOBAL AREA (SGA) into memory: 4002M
Tue Apr 10 12:29:13 2018
 Available system pagesizes:
  4K, 2048K 
Tue Apr 10 12:29:13 2018
 Supported system pagesize(s):
Tue Apr 10 12:29:13 2018
  PAGESIZE  AVAILABLE_PAGES  EXPECTED_PAGES  ALLOCATED_PAGES  ERROR(s)
Tue Apr 10 12:29:13 2018
        4K       Configured               5         1024005        NONE
Tue Apr 10 12:29:13 2018
     2048K                0            2001               0        NONE
Tue Apr 10 12:29:13 2018
RECOMMENDATION:
Tue Apr 10 12:29:13 2018
 1. For optimal performance, configure system with expected number 
 of pages for every supported system pagesize prior to the next 
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