diff options
Diffstat (limited to 'lib/kernel/test')
| -rw-r--r-- | lib/kernel/test/file_SUITE.erl | 73 |
1 files changed, 70 insertions, 3 deletions
diff --git a/lib/kernel/test/file_SUITE.erl b/lib/kernel/test/file_SUITE.erl index b1c06e6aa7..0a4d5a31d2 100644 --- a/lib/kernel/test/file_SUITE.erl +++ b/lib/kernel/test/file_SUITE.erl @@ -92,6 +92,8 @@ -export([bytes/2, iterate/3]). +%% System probe functions that might be handy to check from the shell +-export([unix_free/1, memsize/0, bsd_memsize/1, win_memsize/1]). -include_lib("test_server/include/test_server.hrl"). -include_lib("kernel/include/file.hrl"). @@ -3340,10 +3342,16 @@ large_write(Config) when is_list(Config) -> "_large_write"). do_large_write(Name) -> - case erlang:system_info(wordsize) of - 4 -> + Memsize = memsize(), + io:format("Memsize = ~w Bytes~n", [Memsize]), + case {erlang:system_info(wordsize),Memsize} of + {4,_} -> {skip,"Needs a 64-bit emulator"}; - 8 -> + {8,N} when N < 6 bsl 30 -> + {skip, + "This machine has < 6 GB memory: " + ++integer_to_list(N)}; + {8,_} -> Size = 4*1024*1024*1024+1, Bin = <<0:Size/unit:8>>, ok = file:write_file(Name, Bin), @@ -3989,3 +3997,62 @@ unix_free(Path) -> RE = "^[^\\s]*\\s+\\d+\\s+\\d+\\s+(\\d+)", {match,[Avail]} = re:run(Last, RE, [{capture,all_but_first,list}]), list_to_integer(Avail). + +memsize() -> + case os:type() of + {unix,openbsd} -> + bsd_memsize("hw.physmem"); + {unix,freebsd} -> + bsd_memsize("hw.physmem"); + {unix,darwin} -> + bsd_memsize("hw.memsize"); + {unix,linux} -> + Meminfo = os:cmd("cat /proc/meminfo"), + Re = "^MemTotal:\\s+(\\d+)\\s+kB\$", + ReOpts = [multiline,{capture,all_but_first,list}], + case re:run(Meminfo, Re, ReOpts) of + {match,[Str]} -> + list_to_integer(Str) bsl 10; + nomatch -> + 0 + end; + {win32,_} -> + win_memsize(os:cmd("mem.exe")); + _ -> + 0 + end. + +bsd_memsize(MIB) -> + Reply = os:cmd(["sysctl ",MIB]), + try strip_prefix(MIB, Reply) of + Str -> + Re = "^\\s*(?::|=)\\s*(\\d+)", + ReOpts = [{capture,all_but_first,list}], + case re:run(Str, Re, ReOpts) of + {match,[SizeStr]} -> + list_to_integer(SizeStr); + nomatch -> + 0 + end + catch + error:_ -> + 0 + end. + +win_memsize(Mem) -> + Lines = re:split(Mem, "\\R+", [trim,{return,list}]), + {ok,RE} = re:compile("^\\s*(\\d+)"), + REOpts = [{capture,all_but_first,list}], + Numbers = + [case re:run(Line, RE, REOpts) of + nomatch -> + 0; + {match,[Digits]} -> + list_to_integer(Digits) + end || Line <- Lines], + lists:foldl(fun erlang:max/2, 0, Numbers). + +strip_prefix([X|Prefix], [X|List]) -> + strip_prefix(Prefix, List); +strip_prefix([], List) -> + List. |