I ran my app with --prof key to create v8.log. Then I installed node-tick
and ran it to analyze the log. It turned out that most of the time is spent
in EXTERNAL VM state.
Node is 0.8.22
I interpret the node-tick log as the app spends most time (335 / 419 = 80%)
in External VM state running unknown code from addresses b77d0000-b77d1000
How do I figure out what's going on?
-- Andy
[foo@bar pp] ~/node_modules/.bin/node-tick-processor -e | grep -Fv "Code
move event for unknown code" | less
Statistical profiling result from v8.log, (419870 ticks, 0 unaccounted,
57996 excluded).
[Shared libraries]:
ticks total nonlib name
335228 79.8% 0.0% b77d0000-b77d1000
26541 6.3% 0.0% /usr/bin/node
66 0.0% 0.0% /usr/lib/libpthread-2.17.so
25 0.0% 0.0% /usr/lib/libc-2.17.so
5 0.0% 0.0% /usr/lib/libstdc++.so.6.0.18
4 0.0% 0.0% /usr/lib/libcrypto.so.1.0.0
3 0.0% 0.0% /usr/lib/libgcc_s.so.1
2 0.0% 0.0% /usr/lib/libssl.so.1.0.0
[JavaScript]:
ticks total nonlib name
[C++]:
ticks total nonlib name
[GC]:
ticks total nonlib name
15866 3.8%
[Bottom up (heavy) profile]:
Note: percentage shows a share of a particular caller in the total
amount of its parent calls.
Callers occupying less than 2.0% are not shown.
ticks parent name
335228 79.8% b77d0000-b77d1000
26541 6.3% /usr/bin/node
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