* gc.c: tuning parameters.

* gc.c (GC_MALLOC_LIMIT): change default value to 16MB.
* gc.c (GC_MALLOC_LIMIT_GROWTH_FACTOR): change default value to 2.0.
* gc.c (gc_before_sweep): change decrease ratio of `malloc_limit'
  from 1/4 to 1/10.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43425 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,14 @@
+Sat Oct 26 11:35:22 2013  Koichi Sasada  <ko1@atdot.net>
+
+	* gc.c: tuning parameters.
+
+	* gc.c (GC_MALLOC_LIMIT): change default value to 16MB.
+
+	* gc.c (GC_MALLOC_LIMIT_GROWTH_FACTOR): change default value to 2.0.
+
+	* gc.c (gc_before_sweep): change decrease ratio of `malloc_limit'
+	  from 1/4 to 1/10.
+
 Sat Oct 26 11:30:07 2013  Koichi Sasada  <ko1@atdot.net>
 
 	* gc.c (vm_malloc_increase): do gc_rest_sweep() before GC.

gc.c

@@ -90,13 +90,13 @@ rb_gc_guarded_ptr(volatile VALUE *ptr)
 #define GC_HEAP_GROWTH_MAX 0 /* 0 is disable */
 #endif
 #ifndef GC_MALLOC_LIMIT
-#define GC_MALLOC_LIMIT (8 /* 8 MB */ * 1024 * 1024 /* 1MB */)
+#define GC_MALLOC_LIMIT (16 /* 16 MB */ * 1024 * 1024 /* 1MB */)
 #endif
 #ifndef GC_MALLOC_LIMIT_MAX
 #define GC_MALLOC_LIMIT_MAX (512 /* 512 MB */ * 1024 * 1024 /* 1MB */)
 #endif
 #ifndef GC_MALLOC_LIMIT_GROWTH_FACTOR
-#define GC_MALLOC_LIMIT_GROWTH_FACTOR 1.8
+#define GC_MALLOC_LIMIT_GROWTH_FACTOR 2.0
 #endif
 
 typedef struct {
@@ -2541,7 +2541,7 @@ gc_before_sweep(rb_objspace_t *objspace)
 	    }
 	}
 	else {
-	    malloc_limit -= (size_t)(malloc_limit * ((initial_malloc_limit_growth_factor - 1) / 4));
+	    malloc_limit -= (size_t)(malloc_limit * ((initial_malloc_limit_growth_factor - 1) / 10));
 	    if (malloc_limit < initial_malloc_limit) {
 		malloc_limit = initial_malloc_limit;
 	    }