Hi everyone,
I'm looking for a way to check a responsiveness of node.js app, and find
out if it tries to do more work that it should, and I need to scale up it
somehow.
CPU time isn't it. If I see 100% cpu load, it might indicate that node.js
is currently successfully serving thousands of requests, or it might
indicate that someone put in extra semicolon in "while(1); {blablabla}"
sentence, and there's no way to distinguish these.
On the other hand, a difference between time when some callback should fire
and a time when it actually fires shows what's needed. If some callback
executes a second after it should, we surely are in trouble. There is a lot
of packages like 'toobusy' seem to do exactly that, they fire up a callback
every second and measure a time when it fired. But it sounds like too rough
or imprecise way.
When I was thinking about that, I remembered how load average in unix
kernels is calculated. If there was such thing for node.js core, that would
solve an issue. I mean, just like 'os kernel load average' shows amount of
currently runnable processes, I'd like to see 'node.js event loop load
average' that shows amount of currently runnable functions in node.js event
loop. Is there such thing?
Anyway, what performance metrics does event loop expose? Maybe some libuv
functions I can use to get that? Or maybe I can register a custom c++
function that gets executed in every tick in event loop?
--
alex
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