latency statistic data is empty

[wannastar]

step1:
compile fastdds with -DFASTDDS_STATISTICS=ON（default is on）and -DPERFORMANCE_TESTS=ON
step2:
./LatencyTest publisher -f payloads_demands.csv --domain 0 -s 1000000
./LatencyTest subscriber -f payloads_demands.csv --domain 0
step3:
configure fastddsmonitor to introspect FASTDDS LATENCY like picture1, but the graph is always empty.

[Jackie2chen]

Hello, did you find a way to deal with this issue?

[mbulucay]

Is there any improvement on this topic? @wannastar @Jackie2chen

[Jackie2chen]

haha You can increase the number of FastDDS instances and ensure reliability to solve this issue.

[mbulucay]

I could not understand. Do I need to start 2-3 instance of latency process @Jackie2chen

[Jackie2chen]

I could not understand. Do I need to start 2-3 instance of latency process @Jackie2chen

because the statistical topic is the message with a key. However, the default QoS settings in Fast DDS will only receive data from a subset of keys as a limitation. Therefore, you just need to modify the QoS settings related to the key's limit in order to resolve this issue.