clean code base

docs/performance.md

@@ -1,23 +1,29 @@
+# Extremely Fast
+
+`csvtojson` takes care of performance and optimise for Node.js apps. 
+
+[This project](https://github.com/Keyang/csvbench) shows `csvtojson` is about **4 - 6 times** faster than other popular csv parsing libraries.
+
 # Performance Optimisation
 
 Version 1.1.0 is much faster than versions before. 
 
-Below test is parsing a 300K records csv
+Below test is parsing a 300k records csv on a 4 core machine
 
- Time | workNum = 1 | workNum = 2 (fork)* | workNum = 3 |  workNum = 4
+ Time | workerNum = 1 | workerNum = 2 (fork)* | workerNum = 3 |  workerNum = 4
 --- | --- | --- | --- | ---
 **1.0.3** | 11.806s | 15.945s | 8.611s | 8.314s
 **1.1.0** | 9.707s | 10.065s | 5.955s | 4.563s
 
-*when workNum=2, it only creates 1 extra worker to unblock main process. It is reasonalbe it is slightly slower than workerNum=1 (just use main process).
+*when workerNum=2, it only creates 1 extra worker to unblock main process. It is reasonalbe it is slightly slower than workerNum=1 (just use main process).
 
 The result shows V1.1.0 has about 30% - 50% performance boost.
 
 # CPU usage leverage
 
 Below is CPU core usages for v1.1.0 when running the test:
 
- Core | workNum = 1 | workNum = 2| workNum = 3 |  workNum = 4
+ Core | workerNum = 1 | workerNum = 2| workerNum = 3 |  workerNum = 4
 --- | --- | --- | --- | ---
 Core 1 (Main) | 100% | 25% | 60% | 90%
 Core 2 | N/A | 80% | 70% | 70%

libs/core/Converter.js

@@ -1,12 +1,8 @@
 var util = require("util");
 var Transform = require("stream").Transform;
-var Readable = require("stream").Readable;
-var Result = require("./Result");
 var os = require("os");
 var eol = os.EOL;
 // var Processor = require("./Processor.js");
-var utils = require("./utils.js");
-var async = require("async");
 var defParam=require("./defParam");
 var csvline=require("./csvline");
 var fileline=require("./fileline");