The meaning of "Queued", "Pending", and "Avg (s)" under Subscribers in IceMX metrics

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CPU: E5-2687W v2 @ 3.40GHz
OS: CentOS 7.3
Kernel: 3.10.0-514.21.2
ZeroC Version: 3.6.2
I'm attempting to ascertain which of the IceMX metrics are of benefit to monitor for performance-tracking purposes. I was hoping for additional insight into latency or throughput behavior, but I'm unsure if these metrics fit the bill.
Can someone provide a better understanding of the metrics in the heading, and point me to which section provides the most insight into latency and throughput of ICEStorm?
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Hi,
For each subscriber, IceStorm forward events as follow:
ice_invoke
invocation on the subscriber proxyice_invoke
reported the invocation as sent or once the response has been received (depending on the QoS and delivery mode).When the event is dequeued from the queue to be sent depends on the delivery mode and QoS used for the subscriber. For example, if using the two-way ordered delivery mode and QoS, events are delivered one after the other only once the response from the previous invocation has been received. When using the oneway delivery mode, events are queued and sent immediately if less the 5 events are outstanding (waiting for Ice acknowledgment for the event to be sent).
The metrics
queued
,outstanding
anddelivered
data members correspond to the different state explained above. It tells you how many events are queued waiting to be sent, how any events are outstanding waiting for the Ice confirmation that they have been sent (or response received in case of two-way ordered) and the number of events delivered to the subscriber.Cheers,
Benoit.
So then what is the Start Marker and End Marker for the "Avg (s)" column? From the time it is initially queued til the time it is finally delivered?
ping
I suppose you are referring to the Avg column shown by the python Metrics demo. Here's a description of the columns:
The average lifetime of a subscriber is computed here using the metrics totalLifetime, total and current data members.
For more information on Ice Management eXtension, see the following links:
Let us know if you need additional information!