fixed high memory usage

index.js

@@ -92,28 +92,30 @@ if (cluster.isMaster) {
           args.numWallets;
         spinner.start();
       } else if (message.counter) {
-        addps++;
+        addps += message.counter;
       }
     });
   }
 } else {
   const worker_env = process.env;
-  while (true) {
-    if (process.send) {
+  setInterval(function() {
+    var res = VanityEth.getVanityWallet(
+      worker_env.input,
+      worker_env.isChecksum == "true",
+      worker_env.isContract == "true",
+      1000
+    );
+    if(res[1] > 0) {
       process.send({
-        account: VanityEth.getVanityWallet(
-          worker_env.input,
-          worker_env.isChecksum == "true",
-          worker_env.isContract == "true",
-          function () {
-            process.send({
-              counter: true,
-            });
-          }
-        ),
+        counter: res[1],
       });
     }
-  }
+    if(res[0]) {
+      process.send({
+        account: res[0],
+      });
+    }
+  }, 1000);
 }
 process.stdin.resume();
 const cleanup = function (options, err) {

libs/VanityEth.js

@@ -31,17 +31,24 @@ var getVanityWallet = function (
   input = "",
   isChecksum = false,
   isContract = false,
-  counter = function () {}
+  maxTime = 0
 ) {
   if (!isValidHex(input)) throw new Error(ERRORS.invalidHex);
   input = isChecksum ? input : input.toLowerCase();
   var _wallet = getRandomWallet();
+  var now = (new Date()).getTime();
+  var startTime = now;
+  var loopCount = 0;
   while (!isValidVanityWallet(_wallet, input, isChecksum, isContract)) {
-    counter();
+    loopCount++;
     _wallet = getRandomWallet(isChecksum);
+    if(maxTime && loopCount % 10 === 0 && (new Date()).getTime() - startTime > maxTime) {
+      return [null, loopCount];
+    }
   }
+
   if (isChecksum) _wallet.address = ethUtils.toChecksumAddress(_wallet.address);
-  return _wallet;
+  return [ _wallet, loopCount ];
 };
 var getDeterministicContractAddress = function (address) {
   return (