From 14c7fefd51be035a44bfe42127fb4b9df92d760b Mon Sep 17 00:00:00 2001 From: Lukas Larsson Date: Mon, 6 Jul 2015 17:13:52 +0200 Subject: 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 --- erts/emulator/beam/erl_init.c | 1 + 1 file changed, 1 insertion(+) (limited to 'erts/emulator/beam/erl_init.c') diff --git a/erts/emulator/beam/erl_init.c b/erts/emulator/beam/erl_init.c index 5c209a4af2..69c0de81be 100644 --- a/erts/emulator/beam/erl_init.c +++ b/erts/emulator/beam/erl_init.c @@ -388,6 +388,7 @@ erl_init(int ncpu, erts_mseg_late_init(); /* Must be after timer (erts_init_time()) and thread initializations */ #endif + erl_sys_late_init(); #ifdef HIPE hipe_mode_switch_init(); /* Must be after init_load/beam_catches/init */ #endif -- cgit v1.2.3