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shaka-packager/docs/linux_profiling.md

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Linux Profiling

In theory we should be able to build packager using gperftools to get back the profiling functionality described below. However actually integrating this into the CMake build is not yet done. Pull requests welcome. See https://github.com/shaka-project/shaka-packager/issues/1277

If packager was linked using -ltcmalloc then the following instructions should work:

CPU Profiling

In order to enable cpu profiling, run shaka-packager with the environment variable CPUPROFILE set to a filename. For example:

CPUPROFILE=/tmp/cpuprofile out/Release/packager

The cpu profile will be dumped periodically to the filename specified in the CPUPROFILE environment variable. You can then analyze the dumps using the pprof script (packager/third_party/tcmalloc/chromium/src/pprof). For example,

pprof --gv out/Release/packager /tmp/cpuprofile

This will generate a visual representation of the cpu profile as a postscript file and load it up using gv. For more powerful commands, please refer to the pprof help output and the google-perftools documentation.

For further information, please refer to http://google-perftools.googlecode.com/svn/trunk/doc/cpuprofile.html.

Heap Profiling

To turn on the heap profiler on shaka-packager, use the HEAPPROFILE environment variable to specify a filename for the heap profile. For example:

HEAPPROFILE=/tmp/heapprofile out/Release/packager

The heap profile will be dumped periodically to the filename specified in the HEAPPROFILE environment variable. The dumps can be analyzed using the same command as cpu profiling above.

For further information, please refer to http://google-perftools.googlecode.com/svn/trunk/doc/heapprofile.html.

Some tests fork short-living processes which have a small memory footprint. To catch those, use the HEAP_PROFILE_ALLOCATION_INTERVAL environment variable.

Dumping a profile of a running process

To programmatically generate a heap profile before exit, use code like:

#include <gperftools/heap-profiler.h>

// "foobar" will be included in the message printed to the console
HeapProfilerDump("foobar");

Or you can use gdb to attach at any point:

  1. Attach gdb to the process: $ gdb -p 12345
  2. Cause it to dump a profile: (gdb) p HeapProfilerDump("foobar")
  3. The filename will be printed on the console, e.g. "Dumping heap profile to heap.0001.heap (foobar)"

Thread sanitizer (tsan)

To compile with the thread sanitizer library (tsan), you must set clang as your compiler and set -fsanitize=thread in compiler flags.

NOTE: tsan and asan cannot be used at the same time.

Adddress sanitizer (asan)

To compile with the address sanitizer library (asan), you must set clang as your compiler and set -fsanitize=address in compiler and linker flags.

NOTE: tsan and asan cannot be used at the same time.

Leak sanitizer (lsan)

To compile with the leak sanitizer library (lsan), you must set clang as your compiler and use -fsanitize=leak in compiler and linker flags.