fix: Use real system memory via OperatingSystemMXBean

Replaces JVM Runtime heap values with actual system physical/swap
memory from com.sun.management.OperatingSystemMXBean, matching
the Win32 GlobalMemoryStatus values the originals returned.

1 files changed, 6 insertions, 7 deletions

diff --git a/NET/worlds/core/SystemInfo.java b/NET/worlds/core/SystemInfo.java
index 8a138aa..594c88d 100644
--- a/NET/worlds/core/SystemInfo.java
+++ b/NET/worlds/core/SystemInfo.java
@@ -7,6 +7,8 @@ import java.io.PrintStream;
 
 public class SystemInfo implements MainCallback, MainTerminalCallback {
    private static SystemInfo instance = new SystemInfo();
+   private static final com.sun.management.OperatingSystemMXBean operatingSystemMXBean =
+      (com.sun.management.OperatingSystemMXBean) java.lang.management.ManagementFactory.getOperatingSystemMXBean();
    private long _lastFrame = 0L;
    private long _lastReport = 0L;
    private long _min;
@@ -111,22 +113,19 @@ public class SystemInfo implements MainCallback, MainTerminalCallback {
    }
 
    public static int GetTotalPhysicalMemory() {
-      return (int)(Runtime.getRuntime().maxMemory() / 1024L);
+      return (int)(operatingSystemMXBean.getTotalPhysicalMemorySize() / 1024L);
    }
 
    public static int GetAvailPhysicalMemory() {
-      return (int)(Runtime.getRuntime().freeMemory() / 1024L);
+      return (int)(operatingSystemMXBean.getFreePhysicalMemorySize() / 1024L);
    }
 
    public static int GetTotalPagedMemory() {
-      return (int)(Runtime.getRuntime().totalMemory() / 1024L);
+      return (int)(operatingSystemMXBean.getTotalSwapSpaceSize() / 1024L);
    }
 
    public static int GetAvailPagedMemory() {
-      Runtime runtime = Runtime.getRuntime();
-      long availableMemory = runtime.maxMemory() - (runtime.totalMemory() - runtime.freeMemory());
-      
-      return (int)(availableMemory / 1024L);
+      return (int)(operatingSystemMXBean.getFreeSwapSpaceSize() / 1024L);
    }
 
    public static String GetPlatformID() {