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# HG changeset patch
# User James Le Cuirot <chewi@gentoo.org>
# Date 1441543564 -3600
# Sun Sep 06 13:46:04 2015 +0100
# Node ID d0224f4490d6694e77dcb0ff7eae8e2297b822bf
# Parent e215e36be9fc2b7dfe43ff10ec1afe639b289aa5
Dynamically set the maximum heap size on Linux
diff -r e215e36be9fc -r d0224f4490d6 src/vm/vm.cpp
--- cacao/cacao/src/vm/vm.cpp Mon Feb 11 19:31:28 2013 +0100
+++ cacao/cacao/src/vm/vm.cpp Sun Sep 06 13:46:04 2015 +0100
@@ -33,6 +33,10 @@
#include <errno.h>
#include <stdlib.h>
+#if defined(__LINUX__)
+#include <unistd.h>
+#endif
+
#include "vm/types.h"
#include "arch.h"
@@ -702,6 +706,19 @@
opt_heapstartsize = HEAP_STARTSIZE;
opt_stacksize = STACK_SIZE;
+#if defined(__LINUX__)
+ // Calculate 1/4 of the physical memory.
+ uint64_t qmem = sysconf(_SC_PHYS_PAGES) * sysconf(_SC_PAGESIZE) / 4;
+
+ if (qmem > INT32_MAX) {
+ // More than 2GB will overflow so cap it.
+ opt_heapmaxsize = 2047 * 1024 * 1024;
+ } else if (qmem > HEAP_MAXSIZE) {
+ // Otherwise use this if greater than default (128MB).
+ opt_heapmaxsize = (s4) qmem;
+ }
+#endif
+
// First of all, parse the -XX options.
#if defined(ENABLE_VMLOG)
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