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authorRaimo Niskanen <[email protected]>2011-12-16 11:32:57 +0100
committerRaimo Niskanen <[email protected]>2011-12-20 14:39:56 +0100
commit5a3a2097e0e931257bf1182fa575c7b973519886 (patch)
tree7b25a3a6d9913266e2b425f65f5f6d621f875d48 /lib
parentb3db46435e2d32aa4197753bc95a81648f794021 (diff)
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file_SUITE: large_write - check mem size before creating huge binary
Diffstat (limited to 'lib')
-rw-r--r--lib/kernel/test/file_SUITE.erl73
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.