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Gperf memory and cpu analysis

The valgrind is a very good memory and cpu profile tool, but the st(state-threads) used by SRS does not support valgrind.

The gperf is a project of google, to analysis memory and cpu, base on tcmalloc. SRS can use gperf.

The use scenarios:

• gmc: gperf memory check, read https://gperftools.github.io/gperftools/heap_checker.html
• gmp: gperf memory profile, read https://gperftools.github.io/gperftools/heapprofile.html
• gcp: gperf cpu profile, read https://gperftools.github.io/gperftools/cpuprofile.html

gmc memory check

To use gmc for SRS:

• When configure gmc: ./configure --with-gperf --with-gmc
• Compile srs: make
• Set env when start SRS: env PPROF_PATH=./objs/pprof HEAPCHECK=normal ./objs/srs -c conf/srs.conf
• Stop SRS, get the gmc report: press CTRL+C or send SIGINT to SRS.

Note: When make SRS success, it will show these commands.

It work when SRS print the following message:

[winlin@dev6 srs]$ env PPROF_PATH=./objs/pprof HEAPCHECK=normal ./objs/srs -c conf/srs.conf
WARNING: Perftools heap leak checker is active -- Performance may suffer

The gmc report:

Leak check _main_ detected leaks of 184 bytes in 4 objects
The 4 largest leaks:
Using local file ./objs/srs.
Leak of 56 bytes in 1 objects allocated from:
	@ 46fae8 _st_stack_new
	@ 46f6b1 st_thread_create
	@ 46ea65 st_init
	@ 433f41 SrsServer::initialize
	@ 46e4ca main
	@ 3855a1ec5d __libc_start_main

Other examples, see research/gperftools/heap-checker

GMP memory profile

To use gmp for SRS:

• Configure SRS: ./configure --with-gperf --with-gmp
• Build SRS: make
• Start SRS for memory profile: rm -f gperf.srs.gmp*; ./objs/srs -c conf/srs.conf
• Stop SRS to generate gmp file, press CTRL+C or send SIGINT to SRS.
• Analysis gmp file: ./objs/pprof --text objs/srs gperf.srs.gmp*

Note: When make SRS success, it will show these commands.

It works when SRS show the messages:

[winlin@dev6 srs]$ ./objs/srs -c conf/srs.conf
Starting tracking the heap

The gmc result:

[winlin@dev6 srs]$ ./objs/pprof --text objs/srs gperf.srs.gmp*
Using local file objs/srs.
Using local file gperf.srs.gmp.0001.heap.
Total: 0.1 MB
     0.0  31.5%  31.5%      0.0  49.1% SrsConfDirective::parse_conf
     0.0  28.4%  59.9%      0.0  28.4% std::basic_string::_Rep::_S_create
     0.0  27.4%  87.3%      0.0  27.4% _st_epoll_init
     0.0  11.7%  99.0%      0.0  11.7% __gnu_cxx::new_allocator::allocate
     0.0   0.4%  99.5%      0.0  27.9% st_init

Other examples, read research/gperftools/heap-profiler

GCP cpu profile

To use gmp for SRS:

• Configure with gcp: ./configure --with-gperf --with-gcp
• Build SRS: make
• Start SRS with gcp: rm -f gperf.srs.gcp*; ./objs/srs -c conf/srs.conf
• Stop SRS to generate the gcp file, press CTRL+C or send SIGINT to SRS.
• Analysis gcp file: ./objs/pprof --text objs/srs gperf.srs.gcp*

Note: When make SRS success, it will show these commands.

The gcp result:

[winlin@dev6 srs]$ ./objs/pprof --text objs/srs gperf.srs.gcp*
Using local file objs/srs.
Using local file gperf.srs.gcp.
Removing _L_unlock_16 from all stack traces.
Total: 20 samples
       8  40.0%  40.0%        8  40.0% 0x00007fff0ea35917
       4  20.0%  60.0%        4  20.0% __epoll_wait_nocancel
       2  10.0%  70.0%        2  10.0% __read_nocancel
       1   5.0%  95.0%        1   5.0% memset
       1   5.0% 100.0%        1   5.0% tc_delete
       0   0.0% 100.0%        5  25.0% 0x00007f9fad927c4f
       0   0.0% 100.0%        2  10.0% SrsBuffer::ensure_buffer_bytes
       0   0.0% 100.0%        5  25.0% SrsClient::do_cycle
       0   0.0% 100.0%        5  25.0% SrsClient::fmle_publish
       0   0.0% 100.0%        1   5.0% SrsClient::process_publish_message

Other examples, read research/gperftools/cpu-profiler

Conflicts

The conflicts:

• gmc+gmp: Conflicts.
• gmc+gcp: OK.
• gmp+gcp: OK.

Note: The configure of SRS will check the conflicts.

Winlin 2014.11