Increase poolSize depending on expected pro static thread count

* This didn't seem to help in a direct test on production but doing since it's the logical thing to do with our current process manager.

NOTE(S):
* We don't currently have clustering management in the project itself but may at some point in the future so this could eventually use some improvement. Trying to keep this simple at start for everyone.


Applies to OpenUserJS#1548

app.js

@@ -18,6 +18,8 @@ var privkey = require('./libs/debug').privkey;
 var fullchain = require('./libs/debug').fullchain;
 var chain = require('./libs/debug').chain;
 
+var os = require('os');
+
 //
 var path = require('path');
 var crypto = require('crypto');
@@ -66,14 +68,15 @@ var _ = require('underscore');
 var findSessionData = require('./libs/modifySessions').findSessionData;
 
 var dbOptions = {};
+var defaultPoolSize = 5;
 if (isPro) {
   dbOptions = {
     secondaryAcceptableLatencyMS: 15,
-    poolSize: 5
+    poolSize: (isPro ? defaultPoolSize * os.cpus().length : defaultPoolSize)
   }
 } else {
   dbOptions = {
-    poolSize: 5,
+    poolSize: defaultPoolSize,
     reconnectTries: 30,
     reconnectInterval: 1000
   }