diff options
Diffstat (limited to 'lib/compiler/test/test_lib.erl')
| -rw-r--r-- | lib/compiler/test/test_lib.erl | 17 |
1 files changed, 13 insertions, 4 deletions
diff --git a/lib/compiler/test/test_lib.erl b/lib/compiler/test/test_lib.erl index a8befbecd9..e06e42276a 100644 --- a/lib/compiler/test/test_lib.erl +++ b/lib/compiler/test/test_lib.erl @@ -44,6 +44,10 @@ smoke_disasm(File) when is_list(File) -> Res = beam_disasm:file(File), {beam_file,_Mod} = {element(1, Res),element(2, Res)}. +%% If we are running cover, we don't want to run test cases that +%% invokes the compiler in parallel, as doing so would probably +%% be slower than running them sequentially. + parallel() -> case ?t:is_cover() orelse erlang:system_info(schedulers) =:= 1 of true -> []; @@ -90,13 +94,18 @@ get_data_dir(Config) -> %% Will fail the test case if there were any errors. p_run(Test, List) -> + S = erlang:system_info(schedulers), N = case ?t:is_cover() of false -> - erlang:system_info(schedulers); + S + 1; true -> - %% Cover is running. Using more than one process - %% will probably only slow down compilation. - 1 + %% Cover is running. Using too many processes + %% could slow us down. Measurements on my computer + %% showed that using 4 parallel processes was + %% slightly faster than using 3. Using more than + %% 4 would not buy us much and could actually be + %% slower. + max(S, 4) end, p_run_loop(Test, List, N, [], 0, 0). |