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Merge pull request #2816 from matrix-org/rav/metrics_comments

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Add some comments about the reactor tick time metric
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Richard van der Hoff 2018-01-23 19:39:26 +00:00 committed by GitHub
commit 25e2456ee7
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1 changed files with 6 additions and 1 deletions
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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)