[Bug 198148] [hwpmc] pmcstat -G doesn't resolve symbols from userland processes
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bugzilla-noreply at freebsd.org
Sat Apr 18 03:00:48 UTC 2015
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=198148
--- Comment #5 from ganbold at gmail.com ---
It looks like when program isn't compiled with debug symbols pmcstat won't
resolve.
Please try following with nginx:
1. Before compiling and installing nginx from ports run make clean.
1. Then run make config to choose DEBUG option additionally.
2. Run make
3. Depending from shell do similar way:
env DONTSTRIP=1 make install
or:
setenv DONTSTRIP 1 && make install
4. Restart nginx
Now start test with httperf to make load on nginx.
Then run for instance:
pmcstat -P INSTR_RETIRED_ANY -O /var/tmp/sample -t <nginx worker process pid>
After while stop it and run:
pmcstat -R /var/tmp/sample -G /var/tmp/sample.callgraph
to generate callgraph or:
pmcstat -R /var/tmp/sample -F /var/tmp/sample.calltree
if you want calltree.
I was successfully able to get callgraph and also calltree with resolved nginx
symbols.
...
01.04% [350] ngx_vslprintf @ /usr/local/sbin/nginx
73.43% [257] ngx_sprintf
48.25% [124] ngx_http_time
100.0% [124] ngx_http_header_filter
100.0% [124] ngx_http_chunked_header_filter
100.0% [124] ngx_http_range_header_filter
100.0% [124] ngx_http_gzip_header_filter
100.0% [124] ngx_http_ssi_header_filter
100.0% [124] ngx_http_charset_header_filter
100.0% [124] ngx_http_userid_filter
100.0% [124] ngx_http_headers_filter
100.0% [124] ngx_http_not_modified_header_filter
100.0% [124] ngx_http_send_header
100.0% [124] ngx_http_static_handler
100.0% [124] ngx_http_core_content_phase
100.0% [124] ngx_http_core_run_phases
19.84% [51] ngx_http_header_filter
100.0% [51] ngx_http_chunked_header_filter
100.0% [51] ngx_http_range_header_filter
100.0% [51] ngx_http_gzip_header_filter
100.0% [51] ngx_http_ssi_header_filter
100.0% [51] ngx_http_charset_header_filter
100.0% [51] ngx_http_userid_filter
100.0% [51] ngx_http_headers_filter
100.0% [51] ngx_http_not_modified_header_filter
100.0% [51] ngx_http_send_header
100.0% [51] ngx_http_static_handler
100.0% [51] ngx_http_core_content_phase
100.0% [51] ngx_http_core_run_phases
100.0% [51] ngx_http_handler
17.12% [44] ngx_http_set_etag
100.0% [44] ngx_http_static_handler
100.0% [44] ngx_http_core_content_phase
100.0% [44] ngx_http_core_run_phases
100.0% [44] ngx_http_handler
100.0% [44] ngx_http_internal_redirect
100.0% [44] ngx_http_index_handler
100.0% [44] ngx_http_core_content_phase
100.0% [44] ngx_http_core_run_phases
100.0% [44] ngx_http_handler
100.0% [44] ngx_http_process_request
100.0% [44] ngx_http_process_request_headers
100.0% [44] ngx_http_process_request_line
...
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