Improve binary garbage collection

The garbage collector in r13b03 is too aggressive in some cases. This
commit raises the level of default initial allowed binary garbage
(virtual heap for binaries) before collecting from 233 words to
46368 words (181 kB on 32-bit).

A new option, min_bin_vheap_size, has been added to spawn_opt,
system_flag and process_flag can be used to change the default values.

The option can also be used with system_info and process_info to
inspect the values.

For symmetry the option min_heap_size has been added to the above
functions where it was previously missing.

Add testcases for min_bin_vheap_size and min_heap_size for
functions process_flag/2, process_info/2, system_info/2 and
spawn_opt/2.

1 files changed, 5 insertions, 2 deletions

diff --git a/erts/emulator/beam/erl_init.c b/erts/emulator/beam/erl_init.c
index 8afd349b85..5d2d119b14 100644
--- a/erts/emulator/beam/erl_init.c
+++ b/erts/emulator/beam/erl_init.c
@@ -84,9 +84,10 @@ int erts_use_sender_punish;
  * Configurable parameters.
  */
 
-Uint display_items;	    /* no of items to display in traces etc */
+Uint display_items;	    	/* no of items to display in traces etc */
 Uint display_loads;		/* print info about loaded modules */
 int H_MIN_SIZE;			/* The minimum heap grain */
+int BIN_VH_MIN_SIZE;		/* The minimum binary virtual*/
 
 Uint32 erts_debug_flags;	/* Debug flags. */
 #ifdef ERTS_OPCODE_COUNTER_SUPPORT
@@ -252,7 +253,8 @@ erl_init(void)
 			 no_schedulers,
 			 no_schedulers_online);
 
-    H_MIN_SIZE = erts_next_heap_size(H_MIN_SIZE, 0);
+    H_MIN_SIZE      = erts_next_heap_size(H_MIN_SIZE, 0);
+    BIN_VH_MIN_SIZE = erts_next_heap_size(BIN_VH_MIN_SIZE, 0);
 
     erts_init_trace();
     erts_init_binary();
@@ -604,6 +606,7 @@ early_init(int *argc, char **argv) /*
     erts_async_max_threads = 0;
     erts_async_thread_suggested_stack_size = ERTS_ASYNC_THREAD_MIN_STACK_SIZE;
     H_MIN_SIZE = H_DEFAULT_SIZE;
+    BIN_VH_MIN_SIZE = VH_DEFAULT_SIZE;
 
     erts_initialized = 0;