From c60ca35b2d1fc36b891f132fbdd2860c3119ccf6 Mon Sep 17 00:00:00 2001
From: Trond Norbye <trond.norbye@gmail.com>
Date: Tue, 1 Mar 2011 11:30:29 +0100
Subject: Bind each UDP socket to an a single worker thread in multiport env

---
 memcached.c | 14 +++++++++++++-
 memcached.h |  1 +
 t/binary.t  |  2 +-
 3 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/memcached.c b/memcached.c
index 5a8fc8e..0e96aa9 100644
--- a/memcached.c
+++ b/memcached.c
@@ -189,6 +189,7 @@ static void settings_init(void) {
     settings.factor = 1.25;
     settings.chunk_size = 48;         /* space for a modest key and value */
     settings.num_threads = 4;         /* N workers */
+    settings.num_threads_per_udp = 0;
     settings.prefix_delimiter = ':';
     settings.detail_enabled = 0;
     settings.reqs_per_event = 20;
@@ -2437,6 +2438,7 @@ static void process_stat_settings(ADD_STAT add_stats, void *c) {
     APPEND_STAT("growth_factor", "%.2f", settings.factor);
     APPEND_STAT("chunk_size", "%d", settings.chunk_size);
     APPEND_STAT("num_threads", "%d", settings.num_threads);
+    APPEND_STAT("num_threads_per_udp", "%d", settings.num_threads_per_udp);
     APPEND_STAT("stat_key_prefix", "%c", settings.prefix_delimiter);
     APPEND_STAT("detail_enabled", "%s",
                 settings.detail_enabled ? "yes" : "no");
@@ -3912,7 +3914,7 @@ static int server_socket(const char *interface,
         if (IS_UDP(transport)) {
             int c;
 
-            for (c = 0; c < settings.num_threads; c++) {
+            for (c = 0; c < settings.num_threads_per_udp; c++) {
                 /* this is guaranteed to hit all threads because we round-robin */
                 dispatch_conn_new(sfd, conn_read, EV_READ | EV_PERSIST,
                                   UDP_READ_BUFFER_SIZE, transport);
@@ -4575,6 +4577,16 @@ int main (int argc, char **argv) {
         }
     }
 
+    /*
+     * Use one workerthread to serve each UDP port if the user specified
+     * multiple ports
+     */
+    if (settings.inter != NULL && strchr(settings.inter, ',')) {
+        settings.num_threads_per_udp = 1;
+    } else {
+        settings.num_threads_per_udp = settings.num_threads;
+    }
+
     if (settings.sasl) {
         if (!protocol_specified) {
             settings.binding_protocol = binary_prot;
diff --git a/memcached.h b/memcached.h
index 74a6592..5f1ac9d 100644
--- a/memcached.h
+++ b/memcached.h
@@ -270,6 +270,7 @@ struct settings {
     double factor;          /* chunk size growth factor */
     int chunk_size;
     int num_threads;        /* number of worker (without dispatcher) libevent threads to run */
+    int num_threads_per_udp; /* number of worker threads serving each udp socket */
     char prefix_delimiter;  /* character that marks a key prefix (for stats) */
     int detail_enabled;     /* nonzero if we're collecting detailed stats */
     int reqs_per_event;     /* Maximum number of io to process on each
diff --git a/t/binary.t b/t/binary.t
index 3a8cab3..68d8c00 100755
--- a/t/binary.t
+++ b/t/binary.t
@@ -2,7 +2,7 @@
 
 use strict;
 use warnings;
-use Test::More tests => 3373;
+use Test::More tests => 3376;
 use FindBin qw($Bin);
 use lib "$Bin/lib";
 use MemcachedTest;
-- 
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