diff options
Diffstat (limited to 'lib/kernel/src/erts_debug.erl')
| -rw-r--r-- | lib/kernel/src/erts_debug.erl | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/lib/kernel/src/erts_debug.erl b/lib/kernel/src/erts_debug.erl index 17bee06b5e..8f81fcf825 100644 --- a/lib/kernel/src/erts_debug.erl +++ b/lib/kernel/src/erts_debug.erl @@ -20,7 +20,7 @@ %% Low-level debugging support. EXPERIMENTAL! --export([size/1,df/1,df/2,df/3]). +-export([size/1,df/1,df/2,df/3,ic/1]). %% This module contains the following *experimental* BIFs: %% disassemble/1 @@ -114,6 +114,19 @@ get_internal_state(_) -> instructions() -> erlang:nif_error(undef). +-spec ic(F) -> Result when + F :: function(), + Result :: term(). + +ic(F) when is_function(F) -> + Is0 = erlang:system_info(instruction_counts), + R = F(), + Is1 = erlang:system_info(instruction_counts), + Is = lists:keysort(2,[{I,C1 - C0}||{{I,C1},{I,C0}} <- lists:zip(Is1,Is0)]), + _ = [io:format("~12w ~w~n", [C,I])||{I,C}<-Is], + io:format("Total: ~w~n",[lists:sum([C||{_I,C}<-Is])]), + R. + -spec lock_counters(info) -> term(); (clear) -> ok; ({copy_save, boolean()}) -> boolean(); |