This patch combines all patches from the performance branch that
implement the svnadmin command line UI part of the membuffer cache 
configuration.

Revisions merged partially from /branches/performance
(excluding all changes not related to the membuffer cache):
982057, 987886

* subversion/svnserve/server.h
  (serve_params_t): add cache size parameter
* subversion/svnserve/main.c
  (svnserve__options): add "-M" parameter
  (main): initialize, parse and apply the new parameter


git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/integrate-cache-membuffer@998852 13f79535-47bb-0310-9956-ffa450edef68

subversion/svnserve/main.c

diff --git a/subversion/svnserve/main.c b/subversion/svnserve/main.c
index 3273988..f52b6d7 100644
--- a/subversion/svnserve/main.c
+++ b/subversion/svnserve/main.c
@@ -189,6 +189,16 @@
         "at the same time is not supported in daemon mode.\n"
         "                             "
         "Use inetd mode or tunnel mode if you need this.]")},
+    {"memory-cache-size", 'M', 1, 
+     N_("size of the extra in-memory cache in MB used to\n"
+        "                             "
+        "minimize redundant operations.\n"
+        "                             "
+        "Default is 128 for threaded and 16 for non-\n"
+        "                             "
+        "threaded mode.\n"
+        "                             "
+        "[used for FSFS repositories only]")},
 #ifdef CONNECTION_HAVE_THREAD_OPTION
     /* ### Making the assumption here that WIN32 never has fork and so
      * ### this option never exists when --service exists. */
@@ -431,6 +441,7 @@
   params.pwdb = NULL;
   params.authzdb = NULL;
   params.log_file = NULL;
+  params.memory_cache_size = (apr_uint64_t)-1;
 
   while (1)
     {
@@ -540,6 +551,10 @@
           handling_mode = connection_mode_thread;
           break;
 
+        case 'M':
+          params.memory_cache_size = 0x100000 * apr_strtoi64(arg, NULL, 0);
+          break;
+
 #ifdef WIN32
         case SVNSERVE_OPT_SERVICE:
           if (run_mode != run_mode_service)
@@ -786,6 +801,25 @@
     winservice_running();
 #endif
 
+  /* Configure FS caches for maximum efficiency with svnserve. 
+   * For pre-forked (i.e. multi-processed) mode of operation,
+   * keep the per-process caches smaller than the default.
+   * Also, apply the respective command line parameters, if given. */
+  {
+    svn_fs_cache_config_t settings = *svn_fs_get_cache_config();
+
+    if (params.memory_cache_size != -1)
+      settings.cache_size = params.memory_cache_size;
+    else if (handling_mode != connection_mode_thread)
+      settings.cache_size = 0x1000000;
+
+    settings.cache_fulltexts = TRUE;
+    settings.cache_txdeltas = FALSE;
+    settings.single_threaded = handling_mode != connection_mode_thread;
+
+    svn_fs_set_cache_config(&settings);
+  }
+
   while (1)
     {
 #ifdef WIN32

subversion/svnserve/server.h

diff --git a/subversion/svnserve/server.h b/subversion/svnserve/server.h
index f567db8..8a4b396 100644
--- a/subversion/svnserve/server.h
+++ b/subversion/svnserve/server.h
@@ -101,6 +101,9 @@
 
   /* A filehandle open for writing logs to; possibly NULL. */
   apr_file_t *log_file;
+
+  /* Size of the in-memory cache (used by FSFS only). */
+  apr_uint64_t memory_cache_size;
 } serve_params_t;
 
 /* Serve the connection CONN according to the parameters PARAMS. */