core: run many bricks within one glusterfsd process

This patch adds support for multiple brick translator stacks running in
a single brick server process.  This reduces our per-brick memory usage
by approximately 3x, and our appetite for TCP ports even more.  It also
creates potential to avoid process/thread thrashing, and to improve QoS
by scheduling more carefully across the bricks, but realizing that
potential will require further work.

Multiplexing is controlled by the "cluster.brick-multiplex" global
option.  By default it's off, and bricks are started in separate
processes as before.  If multiplexing is enabled, then *compatible*
bricks (mostly those with the same transport options) will be started in
the same process.

Backport of:
> Change-Id: I45059454e51d6f4cbb29a4953359c09a408695cb
> BUG: 1385758
> Reviewed-on: https://review.gluster.org/14763

Change-Id: I4bce9080f6c93d50171823298fdf920258317ee8
BUG: 1418091
Signed-off-by: Jeff Darcy <jdarcy@redhat.com>
Reviewed-on: https://review.gluster.org/16496
Smoke: Gluster Build System <jenkins@build.gluster.org>
NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
Reviewed-by: Shyamsundar Ranganathan <srangana@redhat.com>

1 files changed, 6 insertions, 6 deletions

diff --git a/tests/bugs/io-cache/bug-858242.c b/tests/bugs/io-cache/bug-858242.c
index ecdda2a5d23..b6a412d578c 100644
--- a/tests/bugs/io-cache/bug-858242.c
+++ b/tests/bugs/io-cache/bug-858242.c
@@ -1,3 +1,5 @@
+#define _GNU_SOURCE
+
 #include <stdio.h>
 #include <errno.h>
 #include <string.h>
@@ -7,10 +9,6 @@
 #include <stdlib.h>
 #include <unistd.h>
 
-#ifndef linux
-#define fstat64(fd, st) fstat(fd, st)
-#endif
-
 int
 main (int argc, char *argv[])
 {
@@ -47,9 +45,9 @@ main (int argc, char *argv[])
                 goto out;
         }
 
-        ret = fstat64 (fd, &statbuf);
+        ret = fstat (fd, &statbuf);
         if (ret < 0) {
-                fprintf (stderr, "fstat64 failed (%s)", strerror (errno));
+                fprintf (stderr, "fstat failed (%s)", strerror (errno));
                 goto out;
         }
 
@@ -67,6 +65,8 @@ main (int argc, char *argv[])
                 goto out;
         }
 
+        sleep (3);
+
         ret = read (fd, buffer, 1024);
         if (ret >= 0) {
                 fprintf (stderr, "read should've returned error, "