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.)
pmdf counters -show or the
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.
pmdf counters -clear or the
counters clear may be used to reset the
counters to zero.