3 Counting Instructions
Here is an example that shows how to count how many times each instruction is executed:
$ (cd erts/emulator && make icount) MAKE icount make[1]: Entering directory `/home/uabbgus/otp/erts/emulator' . . . make[1]: Leaving directory `/home/uabbgus/otp/erts/emulator' $ cat t.erl -module(t). -compile([export_all,nowarn_export_all]). count() -> erts_debug:ic(fun benchmark/0). benchmark() -> %% Run dialyzer. Root = code:root_dir(), Wc1 = filename:join(Root, "lib/{kernel,stdlib}/ebin/*.beam"), Wc2 = filename:join(Root, "erts/preloaded/ebin/*.beam"), Files = filelib:wildcard(Wc1) ++ filelib:wildcard(Wc2), Opts = [{analysis_type,plt_build},{files,Files},{get_warnings,true}], dialyzer:run(Opts). $ $ERL_TOP/bin/cerl -icount Erlang/OTP 22 [RELEASE CANDIDATE 1] [erts-10.2.4] [source-ac0d451] [64-bit] [smp:4:4] [ds:4:4:10] [async-threads:1] [hipe] [instruction-counting] Eshell V10.2.4 (abort with ^G) 1> c(t). {ok,t} 2> t:count(). 0 badarg_j 0 badmatch_x 0 bs_add_jsstx 0 bs_context_to_binary_x . . . 536461394 move_call_last_yfQ 552405176 allocate_tt 619920327 i_is_eq_exact_immed_frc 636419163 is_nonempty_list_allocate_frtt 641859278 i_get_tuple_element_xPx 678196718 move_return_c 786289914 is_tagged_tuple_frAa 865826424 i_call_f Total: 20728870321 [] 3>