systemtap-toolkit/sample-bt-off-cpu: WARNING: No backtraces found. Quitting now

xfwangcheers · 2017-04-05T21:31:26+00:00

TeamI have implemented the lua_resty_upstream_healthcheck library into our NGINX 1.11.10 build to check the status of our webservices running in the backend....

systemtap-toolkit/sample-bt-off-cpu: WARNING: No backtraces found. Quitting now

xfwangcheers

Hello

I think I have successfully install systemtap and its dependencies, I can run to get the expected result with most of the systemtap-toolkit commands and even generate the flame graph with sample-bt. But, for sample-bt-off-cpu, I only get an empty output with a warning message: No backtraces found. Quitting now like below:

root@xfwang-ubn01:/home/xfwang/systemtap# ./openresty-systemtap-toolkit-master/sample-bt-off-cpu -p 3806 -min 10 -t 30 > sample-off-cpu.bt

WARNING: Tracing 3806 (/usr/local/openresty-1.7.2.1/nginx/sbin/nginx)...

WARNING: No backtraces found. Quitting now...

I compile the openresty from source codes and try to use the apache ab to produce traffic to nginx when running the sample-bt-off-cpu.

Anybody give me some tips?

Thanks

Xiaofeng