Compute RAM based on free system RAM rather than total system RAM

lib/util.js

@@ -150,7 +150,7 @@ exports.getMemoryFlagValueForPlatform = getMemoryFlagValueForPlatform;
  * @returns {number} the amount of RAM to use, in megabytes
  */
 function getMemoryFlagValue(userInput, isScalingReservedRamEnabled) {
-    return getMemoryFlagValueForPlatform(userInput, os.totalmem(), process.platform, isScalingReservedRamEnabled);
+    return getMemoryFlagValueForPlatform(userInput, os.freemem(), process.platform, isScalingReservedRamEnabled);
 }
 exports.getMemoryFlagValue = getMemoryFlagValue;
 /**

src/util.ts

@@ -214,7 +214,7 @@ export function getMemoryFlagValue(
 ): number {
   return getMemoryFlagValueForPlatform(
     userInput,
-    os.totalmem(),
+    os.freemem(),
     process.platform,
     isScalingReservedRamEnabled,
   );