Kbase P133127: When not using -shmsegsize, what is the default value used when allocating shared memory segments?
| Autor |
Progress Software Corporation - Progress |
| Acesso |
Público |
| Publicação |
3/28/2011 |
|
Status: Verified
GOAL:
When not using -shmsegsize, what is the default value used when allocating shared memory segments?
GOAL:
How does the shared memory allocation algorithm work when not specifying -shmsegsize?
FACT(s) (Environment):
OpenEdge 10.1B
OpenEdge 10.1C
All Supported Operating Systems
OpenEdge Category: Database
FIX:
In OpenEdge 10.1B and later, when the database startup parameter "-shmsegsize" is not specified, the database manager attempts to determine the best segment size to use.
It will attempt to allocate 1 segment for the Shared Memory requirements. If the code determines that a 2GB segment should be used, but the machine is configured for a maximum segment size of 1GB, the code "should" end up creating a 1GB segment and then 1 of more segments at the maximum size until the Shared Memory requirements are met. The last segment should be the smallest.
Pre-10.1B behavior can be forced by adding "-shmsegsize 128" in the 32-bit version of our product or using "-shmsegsize 1g" or 1024 for the 64-bit version, to the database startup parameters.