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authorakr <akr@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>2014-09-03 03:06:17 +0000
committerakr <akr@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>2014-09-03 03:06:17 +0000
commit9b16f906922fcb63a35c41b57bcec91f5791ad66 (patch)
tree591cfb42a2994968e13f0992eb83227d7f9e1589 /process.c
parent51ee0a634ea4d7c5fc5000dd66c3b257c0a62d77 (diff)
* 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. git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47363 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Diffstat (limited to 'process.c')
-rw-r--r--process.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/process.c b/process.c
index 89f829c..503e739 100644
--- a/process.c
+++ b/process.c
@@ -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 */