Memory usage profiling

You can find out what function allocated what amount of memory.

tcmalloc

Build with tcmalloc

cmake example:

find_library(TCMALLOC_LIB NAMES tcmalloc)
if(TCMALLOC_LIB)
   message("Found TCMALLOC_LIB: ${TCMALLOC_LIB}")
else()
   message(FATAL_ERROR "${TCMALLOC_LIB} library not found")
endif()
link_libraries(${TCMALLOC_LIB})

Run your app

Start your application with the environment variable set to a filename (to which tcmalloc will dump the graph of allocations):

HEAPPROFILE=mybin.hprof ./google_ngram

View report

The command above will produce files like: mybin.hprof.0132.heap, it then can be viewed with:

google-pprof --gv google_ngram mybin.hprof.0132.heap