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changeset 4459:ccb2f8e3d08d

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Added ngx_ncpu detection for most *nix platforms. This inaccurate detection by using sysconf(_SC_NPROCESSORS_ONLN) can improve usage of the mutex lock optimization on multicore systems.
author Valentin Bartenev <vbart@nginx.com>
date Fri, 10 Feb 2012 11:24:19 +0000
parents 2d4ff8bd5649
children 6299d1c4dbb4
files auto/unix src/os/unix/ngx_posix_init.c
diffstat 2 files changed, 16 insertions(+), 0 deletions(-) [+]
line wrap: on
line diff
--- a/auto/unix
+++ b/auto/unix
@@ -721,3 +721,13 @@ ngx_feature_path=
 ngx_feature_libs=
 ngx_feature_test="struct dirent  dir; dir.d_type = DT_REG"
 . auto/feature
+
+
+ngx_feature="sysconf(_SC_NPROCESSORS_ONLN)"
+ngx_feature_name="NGX_HAVE_SC_NPROCESSORS_ONLN"
+ngx_feature_run=no
+ngx_feature_incs=
+ngx_feature_path=
+ngx_feature_libs=
+ngx_feature_test="sysconf(_SC_NPROCESSORS_ONLN)"
+. auto/feature
--- a/src/os/unix/ngx_posix_init.c
+++ b/src/os/unix/ngx_posix_init.c
@@ -47,7 +47,13 @@ ngx_os_init(ngx_log_t *log)
 
     for (n = ngx_pagesize; n >>= 1; ngx_pagesize_shift++) { /* void */ }
 
+#if (NGX_HAVE_SC_NPROCESSORS_ONLN)
     if (ngx_ncpu == 0) {
+        ngx_ncpu = sysconf(_SC_NPROCESSORS_ONLN);
+    }
+#endif
+
+    if (ngx_ncpu < 1) {
         ngx_ncpu = 1;
     }