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authorLukas Larsson <[email protected]>2015-07-06 17:13:52 +0200
committerLukas Larsson <[email protected]>2015-12-15 10:05:44 +0100
commit14c7fefd51be035a44bfe42127fb4b9df92d760b (patch)
tree05efafe42ac32a0bf25d4c57e5778fb0b8c9990e /erts/emulator/test
parent6089f3c961a981b6bacb6c1590386bb67905ff23 (diff)
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erts: Create forker process for spawn driver
Instead of forking from the beam process, we create a separate process in which all forks are done. This has several advantages: 1) performance: * don't have to close all fd's in the world * fork only has to copy stuff from a small process * work is done in a completely seperate process * a 3x performance increase has been measured, can be made even greater (10x) if we cache the environment in child setup 2) stability * the exec is done in another process than beam, which means that if the file that we exec to is on an nfs that is not available right now we will not block a scheduler until the nfs returns. 3) simplicity * don't have to deal with SIGCHLD in the erts Unfortunately, this solution also implies some badness. 1) There will always be a seperate process running together with beam on unix. This could be confusing and undesirable. 2) We have to transfer the entire environment to child_setup for each command. OTP-13088
Diffstat (limited to 'erts/emulator/test')
-rw-r--r--erts/emulator/test/port_SUITE.erl30
1 files changed, 18 insertions, 12 deletions
diff --git a/erts/emulator/test/port_SUITE.erl b/erts/emulator/test/port_SUITE.erl
index 3d0509a28c..f2a7ddef2c 100644
--- a/erts/emulator/test/port_SUITE.erl
+++ b/erts/emulator/test/port_SUITE.erl
@@ -385,27 +385,33 @@ input_only(Config) when is_list(Config) ->
output_only(Config) when is_list(Config) ->
Dog = test_server:timetrap(test_server:seconds(100)),
Dir = ?config(priv_dir, Config),
+
+ %% First we test that the port program gets the data
Filename = filename:join(Dir, "output_only_stream"),
- output_and_verify(Config, Filename, "-h0",
- random_packet(35777, "echo")),
+ Data = random_packet(35777, "echo"),
+ output_and_verify(Config, ["-h0 -o", Filename], Data),
+ Wait_time = 500,
+ test_server:sleep(Wait_time),
+ {ok, Written} = file:read_file(Filename),
+ Data = binary_to_list(Written),
+
+ %% Then we test that any writes to stdout from
+ %% the port program is not sent to erlang
+ output_and_verify(Config, ["-h0"], Data),
+
test_server:timetrap_cancel(Dog),
ok.
-output_and_verify(Config, Filename, Options, Data) ->
+output_and_verify(Config, Options, Data) ->
PortTest = port_test(Config),
- Command = lists:concat([PortTest, " ",
- Options, " -o", Filename]),
+ Command = lists:concat([PortTest, " " | Options]),
Port = open_port({spawn, Command}, [out]),
Port ! {self(), {command, Data}},
Port ! {self(), close},
receive
- {Port, closed} -> ok
- end,
- Wait_time = 500,
- test_server:sleep(Wait_time),
- {ok, Written} = file:read_file(Filename),
- Data = binary_to_list(Written),
- ok.
+ {Port, closed} -> ok;
+ Msg -> ct:fail({received_unexpected_message, Msg})
+ end.
%% Test that receiving several packages written in the same
%% write operation works.