PMDF System Manager's Guide

For performance reasons, a node running PMDF keeps a cache of channel counters in memory using a shared memory section (UNIX) or shared file-mapping object (NT). As processes on the node enqueue and dequeue messages, they update the counters in this in-memory cache. If the in-memory section does not exist when a channel runs, the section will be created automatically. (The pmdf startup command also creates the in-memory section, if it does not exist.)

The command pmdf counters -show or the pmdf qm command counters show may be used to show the values of the counters. The PMDF counters may also be viewed via a web interface; see Section 33.7.

The command pmdf counters -clear or the pmdf qm command counters clear may be used to reset the counters to zero.