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Add some comments about the reactor tick time metric

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Richard van der Hoff 2018-01-19 23:51:04 +00:00
parent b0d9e633ee
commit 87b7d72760
1 changed files with 6 additions and 1 deletions
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7
synapse/metrics/__init__.py
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@ -146,10 +146,15 @@ def runUntilCurrentTimer(func):
num_pending += 1
num_pending += len(reactor.threadCallQueue)
start = time.time() * 1000
ret = func(*args, **kwargs)
end = time.time() * 1000
# record the amount of wallclock time spent running pending calls.
# This is a proxy for the actual amount of time between reactor polls,
# since about 25% of time is actually spent running things triggered by
# I/O events, but that is harder to capture without rewriting half the
# reactor.
tick_time.inc_by(end - start)
pending_calls_metric.inc_by(num_pending)