diff options
Diffstat (limited to 'erts')
| -rw-r--r-- | erts/emulator/test/nif_SUITE.erl | 42 | ||||
| -rw-r--r-- | erts/etc/common/escript.c | 18 |
2 files changed, 33 insertions, 27 deletions
diff --git a/erts/emulator/test/nif_SUITE.erl b/erts/emulator/test/nif_SUITE.erl index f9ee96c9ca..bcea9e3539 100644 --- a/erts/emulator/test/nif_SUITE.erl +++ b/erts/emulator/test/nif_SUITE.erl @@ -2637,9 +2637,9 @@ nif_snprintf(Config) -> nif_internal_hash(Config) -> ensure_lib_loaded(Config), HashValueBitSize = nif_hash_result_bitsize(internal), - Terms = unique([random_term() || _ <- lists:seq(1, 5000)]), + Terms = unique([random_term() || _ <- lists:seq(1, 500)]), HashValues = [hash_nif(internal, Term, 0) || Term <- Terms], - test_bit_distribution_fitness(HashValues, HashValueBitSize, 0.05). + test_bit_distribution_fitness(HashValues, HashValueBitSize). nif_internal_hash_salted(Config) -> ensure_lib_loaded(Config), @@ -2648,7 +2648,7 @@ nif_internal_hash_salted(Config) -> nif_phash2(Config) -> ensure_lib_loaded(Config), HashValueBitSize = nif_hash_result_bitsize(phash2), - Terms = unique([random_term() || _ <- lists:seq(1, 5000)]), + Terms = unique([random_term() || _ <- lists:seq(1, 500)]), HashValues = lists:map( fun (Term) -> @@ -2661,12 +2661,12 @@ nif_phash2(Config) -> HashValue end, Terms), - test_bit_distribution_fitness(HashValues, HashValueBitSize, 0.05). + test_bit_distribution_fitness(HashValues, HashValueBitSize). test_salted_nif_hash(HashType) -> HashValueBitSize = nif_hash_result_bitsize(HashType), - Terms = unique([random_term() || _ <- lists:seq(1, 5000)]), - Salts = unique([random_uint32() || _ <- lists:seq(1, 100)]), + Terms = unique([random_term() || _ <- lists:seq(1, 500)]), + Salts = unique([random_uint32() || _ <- lists:seq(1, 50)]), {HashValuesPerSalt, HashValuesPerTerm} = lists:mapfoldl( fun (Salt, Acc) -> @@ -2687,22 +2687,20 @@ test_salted_nif_hash(HashType) -> % Test per-salt hash distribution of different terms lists:foreach( fun ({_Salt, HashValues}) -> - test_bit_distribution_fitness(HashValues, HashValueBitSize, 0.05) + test_bit_distribution_fitness(HashValues, HashValueBitSize) end, HashValuesPerSalt), % Test per-term hash distribution of different salts dict:fold( fun (_Term, HashValues, Acc) -> - % Be more tolerant of relative deviation, - % as there's fewer hash values here. - test_bit_distribution_fitness(HashValues, HashValueBitSize, 0.30), + test_bit_distribution_fitness(HashValues, HashValueBitSize), Acc end, ok, HashValuesPerTerm). -test_bit_distribution_fitness(Integers, BitSize, MaxRelativeDeviation) -> +test_bit_distribution_fitness(Integers, BitSize) -> MaxInteger = (1 bsl BitSize) - 1, OnesPerBit = lists:foldl( @@ -2718,19 +2716,29 @@ test_bit_distribution_fitness(Integers, BitSize, MaxRelativeDeviation) -> orddict:new(), Integers), - ExpectedNrOfOnes = length(Integers) div 2, + N = length(Integers), + ExpectedNrOfOnes = N div 2, + %% ExpectedNrOfOnes should have a binomial distribution + %% with a standard deviation as: + ExpectedStdDev = math:sqrt(N) / 2, + %% which can be approximated as a normal distribution + %% where we allow a deviation of 6 std.devs + %% for a fail probability of 0.000000002: + MaxStdDevs = 6, + FailureText = orddict:fold( fun (BitIndex, NrOfOnes, Acc) -> - RelativeDeviation = abs(NrOfOnes - ExpectedNrOfOnes) / length(Integers), - case RelativeDeviation >= MaxRelativeDeviation of - false -> Acc; + Deviation = abs(NrOfOnes - ExpectedNrOfOnes) / ExpectedStdDev, + case Deviation >= MaxStdDevs of + false -> + Acc; true -> [Acc, io_lib:format( "Unreasonable deviation on number of set bits (i=~p): " - "expected ~p, got ~p (relative dev. ~.3f)~n", - [BitIndex, ExpectedNrOfOnes, NrOfOnes, RelativeDeviation])] + "expected ~p, got ~p (# std.dev ~.3f > ~p)~n", + [BitIndex, ExpectedNrOfOnes, NrOfOnes, Deviation, MaxStdDevs])] end end, [], diff --git a/erts/etc/common/escript.c b/erts/etc/common/escript.c index 630e241882..7f0af77a4c 100644 --- a/erts/etc/common/escript.c +++ b/erts/etc/common/escript.c @@ -433,7 +433,7 @@ main(int argc, char** argv) char* emulator; char* env; char* basename; - char* absname; + char* def_emu_lookup_path; char scriptname[PMAX]; char** last_opt; char** first_opt; @@ -480,6 +480,7 @@ main(int argc, char** argv) #else if (strcmp(basename, "escript") == 0) { #endif + def_emu_lookup_path = argv[0]; /* * Locate all options before the script name. */ @@ -498,27 +499,24 @@ main(int argc, char** argv) argc--; argv++; } else { + char *absname = find_prog(argv[0]); #ifdef __WIN32__ - int len; -#endif - absname = find_prog(argv[0]); -#ifdef __WIN32__ - len = strlen(absname); + int len = strlen(absname); if (len >= 4 && _stricmp(absname+len-4, ".exe") == 0) { absname[len-4] = '\0'; } #endif - erts_snprintf(scriptname, sizeof(scriptname), "%s.escript", absname); - efree(absname); + efree(absname); + def_emu_lookup_path = scriptname; } /* Determine path to emulator */ emulator = env = get_env("ESCRIPT_EMULATOR"); if (emulator == NULL) { - emulator = get_default_emulator(scriptname); + emulator = get_default_emulator(def_emu_lookup_path); } if (strlen(emulator) >= PMAX) @@ -528,7 +526,7 @@ main(int argc, char** argv) * Push initial arguments. */ - push_words(emulator); + PUSH(emulator); free_env_val(env); PUSH("+B"); |