performance issue about the openresty

inevity · 2016-11-12T00:32:27+00:00

Hello, I'm trying to implement simple json file output with lua-resty-websocket module. Here is the example snippets of nginx and lua: nginx ws-test.con...

performance issue about the openresty

inevity

test::nginx benchmark on openresty . with on worker

TEST_NGINX_BENCHMARK='20000 500',put 10 bytes file using ab

The issue is that we can not sample the stack by the lj-lua-stacks.sxx because 'Found 0 JITted samples'.

But the cpu util is about 95-100%,

The sample-bt flame graph is attached. and using perf top,gc_sweep account 6%,and some other lj function.

what is the point? why cannot sample the lua stack?

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inevity

This is because the load i impose on the openresty is too big so that the majority of the cpu power is devoted to the c level.

When lower the load, we can sample the lua stack.

在 2016年11月12日星期六 UTC+8上午12:32:27，保建国写道：

test::nginx benchmark on openresty . with on worker
TEST_NGINX_BENCHMARK='20000 500',put 10 bytes file using ab
The issue is that we can not sample the stack by the lj-lua-stacks.sxx because 'Found 0 JITted samples'.

But the cpu util is about 95-100%,
The sample-bt flame graph is attached. and using perf top,gc_sweep account 6%,and some other lj function.

what is the point? why cannot sample the lua stack?