Using the profiling tools

Profiling tools are in clasp/src/profile

Prerequisite:

• git clone https://github.com/brendangregg/FlameGraph in <path-to-flamegraph>
• git clone https://github.com/clasp-developers/FlameGraph.git in <path-to-flamegraph>
• export FLAME_GRAPH_HOME=<path-to-flamegraph>/FlameGraph

short form

• find out the <pid> of the clasp you want to meter with ps on the command line or (sys:getpid) within clasp.
• Execute ./do-flame <pid> - that leaves a .svg file in /tmp/out-<pid>.svg
• View with your browser

long form

./do-dtrace <pid>

Generates the file /tmp/out-symbol-.user_stacks

./count-calls -i /tmp/out-symbol-<pid>.user_stacks -o /tmp/out.txt

Generates a sorted list of function names and how many of the backtraces contained that function name.

./prune -i /tmp/out-symbol-<pid>.user_stacks -o /tmp/out-pruned.user_stacks -s <PART-OF-FUNCTION-NAME>

Generates backtraces that start with the frame .

./flame /tmp/out-pruned.user_stacks

Generates /tmp/out-.svg - view this in chrome

Use for other compilers:

The profiling code has some specifics to filter clasp frames, but works for other compilers as well (tested with ecl)