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Title
Error: "Lock: Error getting global semaphore [sp_cop(shs)/<pid>]" -
Description
Capture and read stopped, event_log logged Error: Lock: Error getting global semaphore [sp_cop(shs)/<pid>]
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Cause
Insufficient system resource
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Resolution
This is typically due to SEMMAX, or the global semaphore value, parameter set is so small at the system level to support all the applications on the box. The capture and read likely resumed after they were able to get this resource.
These are the semaphore system setting, with SharePlex min required values for UNIX systems, specified in the SharePlex installation guide:
- semmni: number of semaphore identifiers (SharePlex requires 70)
- semmns: number of semaphores in the system (SharePlex requires 255)
- semmnu: number of processes using the undo facility (SharePlex requires 255)
- semmsl: maximum number of System V semaphores that can be used by a single process at one time (the minimum SharePlex requires 128)
- semume: number of undo structures per process (SharePlex requires 255)
AIX Platform Notes
None of the listed parameters requires tuning because each is dynamically adjusted as needed by the kernel. See the appropriate AIX operating system documentation for more information.
The following table lists the tunable parameters for the IBM pSeries AIX 5.2 operating system.
AIX Interprocess Communication Tunable Parameters
Parameter Purpose Dynamic Values
msgmax Specifies maximum message size. Maximum value of 4 MB
msgmnb Specifies maximum number of bytes on queue. Maximum value of 4 MB
msgmni Specifies maximum number of message queue IDs. Maximum value of 4096
msgmnm Specifies maximum number of messages per queue. Maximum value of 524288
semaem Specifies maximum value for adjustment on exit. Maximum value of 16384
semmni Specifies maximum number of semaphore IDs. Maximum value of 4096
semmsl Specifies maximum number of semaphores per ID. Maximum value of 65535
semopm Specifies maximum number of operations per semop() call. Maximum value of 1024
semume Specifies maximum number of undo entries per process. Maximum value of 1024
semvmx Specifies maximum value of a semaphore. Maximum value of 32767
shmmax Specifies maximum shared memory segment size. Maximum value of 256 MB for 32-bit processes and 0x80000000u for 64-bit
shmmin Specifies minimum shared-memory-segment size. Minimum value of 1
shmmni Specifies maximum number of shared memory IDs. Maximum value of 4096