diff options
Diffstat (limited to 'lib/kernel/test/os_SUITE.erl')
| -rw-r--r-- | lib/kernel/test/os_SUITE.erl | 67 |
1 files changed, 44 insertions, 23 deletions
diff --git a/lib/kernel/test/os_SUITE.erl b/lib/kernel/test/os_SUITE.erl index e76d6ec482..a0bcde68db 100644 --- a/lib/kernel/test/os_SUITE.erl +++ b/lib/kernel/test/os_SUITE.erl @@ -1,7 +1,7 @@ %% %% %CopyrightBegin% %% -%% Copyright Ericsson AB 1997-2016. All Rights Reserved. +%% Copyright Ericsson AB 1997-2017. All Rights Reserved. %% %% Licensed under the Apache License, Version 2.0 (the "License"); %% you may not use this file except in compliance with the License. @@ -25,7 +25,8 @@ -export([space_in_cwd/1, quoting/1, cmd_unicode/1, space_in_name/1, bad_command/1, find_executable/1, unix_comment_in_command/1, deep_list_command/1, large_output_command/1, background_command/0, background_command/1, - message_leak/1, close_stdin/0, close_stdin/1, perf_counter_api/1]). + message_leak/1, close_stdin/0, close_stdin/1, max_size_command/1, + perf_counter_api/1]). -include_lib("common_test/include/ct.hrl"). @@ -37,7 +38,7 @@ all() -> [space_in_cwd, quoting, cmd_unicode, space_in_name, bad_command, find_executable, unix_comment_in_command, deep_list_command, large_output_command, background_command, message_leak, - close_stdin, perf_counter_api]. + close_stdin, max_size_command, perf_counter_api]. groups() -> []. @@ -312,6 +313,19 @@ close_stdin(Config) -> "-1" = os:cmd(Fds). +max_size_command(_Config) -> + + Res20 = os:cmd("cat /dev/zero", #{ max_size => 20 }), + 20 = length(Res20), + + Res0 = os:cmd("cat /dev/zero", #{ max_size => 0 }), + 0 = length(Res0), + + Res32768 = os:cmd("cat /dev/zero", #{ max_size => 32768 }), + 32768 = length(Res32768), + + ResHello = string:trim(os:cmd("echo hello", #{ max_size => 20 })), + 5 = length(ResHello). %% Test that the os:perf_counter api works as expected perf_counter_api(_Config) -> @@ -319,31 +333,38 @@ perf_counter_api(_Config) -> true = is_integer(os:perf_counter()), true = os:perf_counter() > 0, - T1 = os:perf_counter(), + Conv = fun(T1, T2) -> + erlang:convert_time_unit(T2 - T1, perf_counter, nanosecond) + end, + + do_perf_counter_test([], Conv, 120000000, 80000000), + do_perf_counter_test([1000], fun(T1, T2) -> T2 - T1 end, 120, 80). + +do_perf_counter_test(CntArgs, Conv, Upper, Lower) -> + %% We run the test multiple times to try to get a somewhat + %% stable value... what does this test? That the + %% calculate_perf_counter_unit in sys_time.c works somewhat ok. + do_perf_counter_test(CntArgs, Conv, Upper, Lower, 10). + +do_perf_counter_test(CntArgs, _Conv, Upper, Lower, 0) -> + ct:fail("perf_counter_test ~p ~p ~p",[CntArgs, Upper, Lower]); +do_perf_counter_test(CntArgs, Conv, Upper, Lower, Iters) -> + + T1 = apply(os, perf_counter, CntArgs), timer:sleep(100), - T2 = os:perf_counter(), - TsDiff = erlang:convert_time_unit(T2 - T1, perf_counter, nano_seconds), - ct:pal("T1: ~p~n" + T2 = apply(os, perf_counter, CntArgs), + TsDiff = Conv(T1, T2), + ct:log("T1: ~p~n" "T2: ~p~n" "TsDiff: ~p~n", [T1,T2,TsDiff]), - %% We allow a 15% diff - true = TsDiff < 115000000, - true = TsDiff > 85000000, - - T1Ms = os:perf_counter(1000), - timer:sleep(100), - T2Ms = os:perf_counter(1000), - MsDiff = T2Ms - T1Ms, - ct:pal("T1Ms: ~p~n" - "T2Ms: ~p~n" - "MsDiff: ~p~n", - [T1Ms,T2Ms,MsDiff]), - - %% We allow a 15% diff - true = MsDiff < 115, - true = MsDiff > 85. + if + TsDiff < Upper, TsDiff > Lower -> + ok; + true -> + do_perf_counter_test(CntArgs, Conv, Upper, Lower, Iters-1) + end. %% Util functions |