[ASIO latency] io_latency_ms measure does not update

[rrozek]

Hi!
Recently I've found that io_latency_ms reported by server_state is last read value of ApplicationImp::m_io_latency_sampler. However it looks like measure which is started on Application startup stalls after few successful measures and never updates again.
(I added log in callback to
template <class Duration> void operator() (Duration const& elapsed)
and it only executes for like... 2-5 seconds after startup

Its pretty easy to observe/reproduce but its hard for me to determine why it stalls...
for instance

1. enable [insight] section in cfg file (or add some log in mentioned callback above, then step 2. is not necessary)
2. add delay to network speed so it is >= 10ms
   tc qdisc add dev eth0 root netem delay 11ms
3. start daemon
4. when finished, remove delay rule:
   tc qdisc del dev eth0 root netem

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[nbougalis]

Hmm! Thanks for this. Will look into this.

[mellery451]

@rrozek thanks for finding and reporting this issue. I've submitted a fix at #2542. If you'd like to verify the fix works for you, you can build from the source branch mentioned there.

[rrozek]

hi @mellery451 !
I can confirm that now measurements are running continuously.
Thank you for your fast problem identification and fix!