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Open/Close Latch

Other Abend

The collector found the thread waiting for the open/close latch. The open/close latch serializes resources to Fast Path databases.

Other DL/I IWAIT

The collector found the thread IWAITing. It also found an indication that the thread was terminating due to an abend.

Other Latch

The collector found the thread executing in DLISAS, but it could not attribute the condition to any of the DL/I-oriented states listed earlier in this chapter.

The collector found the thread in ISERWAIT (latch wait), but not waiting for any of the latches described above.

IMS Waits

SMGT Latch

The collector found the thread waiting for the SMGT (storage management) latch.

The IMS storage management module (DFSISMN0) uses this latch to serialize access to various control blocks and buffers, such as the message queue, CIOP, CWAP, DMB, and PSB pools.

Bottleneck Analysis Execution States

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LOGL Latch

The collector found the thread waiting for the LOGL latch.

The IMS logical logger uses the LOGL latch to serialize access to the buffers that the physical logger writes out to the online log dataset (OLDS). If the physical logger gets behind, ITASKs queue on this latch.

OBFM Latch

The collector found the thread waiting for the OBFM latch. The OBFM latch serializes accesses to OSAM buffers and their associated control information.

Other Wait

The collector found a thread waiting, but could not attribute its execution state to any of the categories documented earlier in this chapter.

Pseudo Abend

The collector found the thread IWAITing and terminating due to a pseudo abend.

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