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* process.c (retry_fork_async_signal_safe): Use vfork() if available.

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vfork() is still faster than fork() especially when the parent
  process uses big memory.

  ruby -rbenchmark -e 'a = "a" * 1_000_000_000; puts Benchmark.measure { system("true") }'
  fork:   0.000000   0.010000   0.010000 (  0.014968)
  vfork:  0.000000   0.000000   0.000000 (  0.000912)
  on Debian sid.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47363 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
akr 2014-09-03 03:06:17 +00:00
parent 51ee0a634e
commit 9b16f90692
2 changed files with 19 additions and 0 deletions
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11
ChangeLog
View file

@ -1,3 +1,14 @@
Wed Sep 3 12:05:17 2014 Tanaka Akira <akr@fsij.org>
* process.c (retry_fork_async_signal_safe): Use vfork() if available.
vfork() is still faster than fork() especially when the parent
process uses big memory.
ruby -rbenchmark -e 'a = "a" * 1_000_000_000; puts Benchmark.measure { system("true") }'
fork: 0.000000 0.010000 0.010000 ( 0.014968)
vfork: 0.000000 0.000000 0.000000 ( 0.000912)
on Debian sid.
Wed Sep 3 11:33:08 2014 SHIBATA Hiroshi <shibata.hiroshi@gmail.com>
* test/openssl/test_pkey_rsa.rb (OpenSSL#test_sign_verify_memory_leak):

8
process.c
View file

@ -50,6 +50,9 @@
#ifdef HAVE_SYS_RESOURCE_H
# include <sys/resource.h>
#endif
#ifdef HAVE_VFORK_H
# include <vfork.h>
#endif
#ifdef HAVE_SYS_PARAM_H
# include <sys/param.h>
#endif
@ -3291,7 +3294,11 @@ retry_fork_async_signal_safe(int *status, int *ep,
while (1) {
prefork();
#ifdef HAVE_WORKING_VFORK
pid = vfork();
#else
pid = fork();
#endif
if (pid == 0) {/* fork succeed, child process */
int ret;
forked_child = 1;
@ -3305,6 +3312,7 @@ retry_fork_async_signal_safe(int *status, int *ep,
_exit(127);
#endif
}
forked_child = 0; /* for vfork(). */
if (0 < pid) /* fork succeed, parent process */
return pid;
/* fork failed */