add sleep to reduce CPU loading

Author: sfchen

src/common.h

@@ -27,7 +27,7 @@ typedef unsigned char uint8;
 static const int PACK_NUM_LIMIT  = 1000000;
 
 // how many reads one pack has
-static const int PACK_SIZE = 1000;
+static const int PACK_SIZE = 10000;
 
 // if one pack is produced, but not consumed, it will be kept in the memory
 // this number limit the number of in memory packs

src/threadconfig.cpp

@@ -1,6 +1,7 @@
 #include "threadconfig.h"
 #include "util.h"
 #include <memory.h>
+#include <unistd.h>
 
 ThreadConfig::ThreadConfig(Options* opt, int threadId){
     mOptions = opt;
@@ -42,6 +43,9 @@ bool ThreadConfig::setInputCompleted() {
 }
 
 void ThreadConfig::output(){
+    if(mOutputCounter >= mInputCounter) {
+        usleep(100);
+    }
     while( mOutputCounter < mInputCounter) 
     {
         long target = mOutputCounter % PACK_NUM_LIMIT;