Merge branch 'egil/process_dictionary-initial-size/OTP-12535'

* egil/process_dictionary-initial-size/OTP-12535:
  erts: Document option 'hpds'
  erts: Enable command line argument for initial pd size

5 files changed, 21 insertions, 1 deletions

diff --git a/erts/doc/src/erl.xml b/erts/doc/src/erl.xml
index 16000191dc..c25c9eeedb 100644
--- a/erts/doc/src/erl.xml
+++ b/erts/doc/src/erl.xml
@@ -588,6 +588,11 @@
         <p>Sets the default binary virtual heap size of processes to the size
           <c><![CDATA[Size]]></c>.</p>
       </item>
+      <tag><c><![CDATA[+hpds Size]]></c></tag>
+      <item>
+        <p>Sets the initial process dictionary size of processes to the size
+          <c><![CDATA[Size]]></c>.</p>
+      </item>
       <tag><c><![CDATA[+K true | false]]></c></tag>
       <item>
         <p>Enables or disables the kernel poll functionality if
diff --git a/erts/emulator/beam/erl_init.c b/erts/emulator/beam/erl_init.c
index 77445ef1ff..fe065e196d 100644
--- a/erts/emulator/beam/erl_init.c
+++ b/erts/emulator/beam/erl_init.c
@@ -191,6 +191,8 @@ int erts_disable_tolerant_timeofday; /* Time correction can be disabled it is
 
 int erts_atom_table_size = ATOM_LIMIT;	/* Maximum number of atoms */
 
+int erts_pd_initial_size = 10;
+
 int erts_modified_timing_level;
 
 int erts_no_crash_dump = 0;	/* Use -d to suppress crash dump. */
@@ -516,6 +518,8 @@ void erts_usage(void)
 	       H_DEFAULT_SIZE);
     erts_fprintf(stderr, "-hmbs size     set minimum binary virtual heap size in words (default %d)\n",
 	       VH_DEFAULT_SIZE);
+    erts_fprintf(stderr, "-hpds size     initial process dictionary size (default %d)\n",
+	       erts_pd_initial_size);
 
     /*    erts_fprintf(stderr, "-i module  set the boot module (default init)\n"); */
 
@@ -1405,6 +1409,7 @@ erl_start(int argc, char **argv)
 	     *
 	     * h|ms  - min_heap_size
 	     * h|mbs - min_bin_vheap_size
+	     * h|pds - erts_pd_initial_size
 	     *
 	     */
 	    if (has_prefix("mbs", sub_param)) {
@@ -1422,6 +1427,14 @@ erl_start(int argc, char **argv)
 		    erts_usage();
 		}
 		VERBOSE(DEBUG_SYSTEM, ("using minimum heap size %d\n", H_MIN_SIZE));
+	    } else if (has_prefix("pds", sub_param)) {
+		arg = get_arg(sub_param+3, argv[i+1], &i);
+		if ((erts_pd_initial_size = atoi(arg)) <= 0) {
+		    erts_fprintf(stderr, "bad initial process dictionary size %s\n", arg);
+		    erts_usage();
+		}
+		VERBOSE(DEBUG_SYSTEM, ("using initial process dictionary size %d\n",
+			    erts_pd_initial_size));
 	    } else {
 	        /* backward compatibility */
 		arg = get_arg(argv[i]+2, argv[i+1], &i);
diff --git a/erts/emulator/beam/erl_process_dict.c b/erts/emulator/beam/erl_process_dict.c
index 3ce707efda..00761f2d0e 100644
--- a/erts/emulator/beam/erl_process_dict.c
+++ b/erts/emulator/beam/erl_process_dict.c
@@ -47,7 +47,7 @@
 
 /* Hash constant macros */
 #define MAX_HASH            1342177280UL
-#define INITIAL_SIZE        10
+#define INITIAL_SIZE        (erts_pd_initial_size)
 
 /* Hash utility macros  */
 #define HASH_RANGE(PDict) ((PDict)->homeSize + (PDict)->splitPosition)
diff --git a/erts/emulator/beam/erl_vm.h b/erts/emulator/beam/erl_vm.h
index 78d98229d8..6e9216bef3 100644
--- a/erts/emulator/beam/erl_vm.h
+++ b/erts/emulator/beam/erl_vm.h
@@ -172,6 +172,7 @@ extern int H_MIN_SIZE;		/* minimum (heap + stack) */
 extern int BIN_VH_MIN_SIZE;	/* minimum virtual (bin) heap */
 
 extern int erts_atom_table_size;/* Atom table size */
+extern int erts_pd_initial_size;/* Initial Process dictionary table size */
 
 #define ORIG_CREATION 0
 #define INTERNAL_CREATION 255
diff --git a/erts/etc/common/erlexec.c b/erts/etc/common/erlexec.c
index 5ebde8ca3c..b68e109b43 100644
--- a/erts/etc/common/erlexec.c
+++ b/erts/etc/common/erlexec.c
@@ -143,6 +143,7 @@ static char *pluss_val_switches[] = {
 static char *plush_val_switches[] = {
     "ms",
     "mbs",
+    "pds",
     "",
     NULL
 };