Change defaults:

Make Grace mode the default with 10 seconds (param: default_grace)

Make the thread idle timeout 300 seconds (param: thread_pool_timeout)

Max one new thread per 20 msec (param: thread_pool_add_delay)



git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@2665 d4fa192b-c00b-0410-8231-f00ffab90ce4

bin/varnishd/cache_hash.c

@@ -56,6 +56,7 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <math.h>
 #include <string.h>
 #include <sys/types.h>
 #include <fcntl.h>
@@ -66,6 +67,14 @@
 
 static struct hash_slinger      *hash;
 
+static double
+HSH_Grace(double g)
+{
+	if (isnan(g))
+		return (double)(params->default_grace);
+	return (g);
+}
+
 /* Precreate an objhead and object for later use */
 void
 HSH_Prealloc(struct sess *sp)
@@ -99,6 +108,7 @@ HSH_Prealloc(struct sess *sp)
 		w->nobj->http->magic = HTTP_MAGIC;
 		w->nobj->busy = 1;
 		w->nobj->refcnt = 1;
+		w->nobj->grace = NAN;
 		VTAILQ_INIT(&w->nobj->store);
 		VTAILQ_INIT(&w->nobj->esibits);
 		VSL_stats->n_object++;
@@ -221,7 +231,7 @@ HSH_Lookup(struct sess *sp)
 			break;
 
 		/* Remember any matching objects inside their grace period */
-		if (o->ttl + o->grace >= sp->t_req)
+		if (o->ttl + HSH_Grace(o->grace) >= sp->t_req)
 			grace_o = o;
 	}
 
@@ -231,7 +241,7 @@ HSH_Lookup(struct sess *sp)
 	 */
 	if (o == NULL && grace_o != NULL &&
 	    grace_o->child != NULL &&
-	    grace_o->ttl + sp->grace >= sp->t_req)
+	    grace_o->ttl + HSH_Grace(sp->grace) >= sp->t_req)
 		o = grace_o;
 
 	if (o != NULL) {

bin/varnishd/cache_session.c

@@ -304,6 +304,7 @@ SES_New(const struct sockaddr *addr, unsigned len)
 	sp->t_req = NAN;
 	sp->t_resp = NAN;
 	sp->t_end = NAN;
+	sp->grace = NAN;
 
 	assert(len <= sp->sockaddrlen);
 	if (addr != NULL) {

bin/varnishd/cache_vrt.c

@@ -40,6 +40,7 @@
 #include <arpa/inet.h>
 
 #include <stdio.h>
+#include <math.h>
 #include <string.h>
 #include <stdlib.h>
 #include <stdarg.h>
@@ -326,6 +327,8 @@ VRT_r_obj_grace(const struct sess *sp)
 {
 	CHECK_OBJ_NOTNULL(sp, SESS_MAGIC);
 	CHECK_OBJ_NOTNULL(sp->obj, OBJECT_MAGIC);	/* XXX */
+	if (isnan(sp->obj->grace))
+		return ((double)params->default_grace);
 	return (sp->obj->grace);
 }
 
@@ -446,6 +449,8 @@ double
 VRT_r_req_grace(struct sess *sp)
 {
 	CHECK_OBJ_NOTNULL(sp, SESS_MAGIC);
+	if (isnan(sp->grace))
+		return ((double)params->default_grace);
 	return (sp->grace);
 }
 

bin/varnishd/heritage.h

@@ -156,6 +156,9 @@ struct params {
 
 	/* Control diagnostic code */
 	unsigned		diag_bitmap;
+
+	/* Default grace period */
+	unsigned		default_grace;
 };
 
 extern volatile struct params *params;

bin/varnishd/mgt_param.c

@@ -503,7 +503,7 @@ static const struct parspec parspec[] = {
 		"\n"
 		"Minimum is 1 second.",
 		EXPERIMENTAL | DELAYED_EFFECT,
-		"120", "seconds" },
+		"300", "seconds" },
 	{ "thread_pool_purge_delay",
 		tweak_timeout, &master.wthread_purge_delay, 100, 0,
 		"Wait this long between purging threads.\n"
@@ -532,7 +532,7 @@ static const struct parspec parspec[] = {
 		"Setting this too short increases the risk of worker "
 		"thread pile-up.\n",
 		EXPERIMENTAL,
-		"10", "milliseconds" },
+		"20", "milliseconds" },
 	{ "thread_pool_fail_delay",
 		tweak_timeout, &master.wthread_fail_delay, 100, UINT_MAX,
 		"Wait at least this long after a failed thread creation "
@@ -581,6 +581,12 @@ static const struct parspec parspec[] = {
 		"Minimum is 1024 bytes.",
 		DELAYED_EFFECT,
 		"8192", "bytes" },
+	{ "default_grace", tweak_uint, &master.default_grace, 0, UINT_MAX,
+		"Default grace period.  We will deliver an object "
+		"this long after it has expired, provided another thread "
+		"is attempting to get a new copy.",
+		DELAYED_EFFECT,
+		"10" "seconds" },
 	{ "sess_timeout", tweak_timeout, &master.sess_timeout, 0, 0,
 		"Idle timeout for persistent sessions. "
 		"If a HTTP request has not been received in this many "