import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;

public class JavaNIOTest {
    public static void main(String[] args) throws Exception {
        useNormalIO();
        useFileChannel();
    }

    private static void useNormalIO() throws Exception {
        File file = new File("/home/developer/test.iso");
        File oFile = new File("/home/developer/test2");

        long time1 = System.currentTimeMillis();
        InputStream is = new FileInputStream(file);
        FileOutputStream fos = new FileOutputStream(oFile);
        byte[] buf = new byte[64 * 1024];
        int len = 0;
        while((len = is.read(buf)) != -1) {
                fos.write(buf, 0, len);
        }
        fos.flush();
        fos.close();
        is.close();
        long time2 = System.currentTimeMillis();
        System.out.println("Time taken: "+(time2-time1)+" ms");
    }

    private static void useFileChannel() throws Exception {
        File file = new File("/home/developer/test.iso");
        File oFile = new File("/home/developer/test2");

        long time1 = System.currentTimeMillis();
        FileInputStream is = new FileInputStream(file);
        FileOutputStream fos = new FileOutputStream(oFile);
        FileChannel f = is.getChannel();
        FileChannel f2 = fos.getChannel();

        ByteBuffer buf = ByteBuffer.allocateDirect(64 * 1024);
        long len = 0;
        while((len = f.read(buf)) != -1) {
                buf.flip();
                f2.write(buf);
                buf.clear();
        }

        f2.close();
        f.close();

        long time2 = System.currentTimeMillis();
        System.out.println("Time taken: "+(time2-time1)+" ms");
    }
}

My experience with larger files sizes has been that java.nio is faster than java.io. Solidly faster.Like in the >250% range. That said, I am eliminating obvious bottlenecks, which I suggest your micro-benchmark might suffer from. Potential areas for investigating:

The buffer size. The algorithm you basically have is

• copy from disk to buffer
• copy from buffer to disk

My own experience has been that this buffer size is ripe for tuning. I've settled on 4KB for one part of my application, 256KB for another. I suspect your code is suffering with such a large buffer. Run some benchmarks with buffers of 1KB, 2KB, 4KB, 8KB, 16KB, 32KB and 64KB to prove it to yourself.

Don't perform java benchmarks that read and write to the same disk.

If you do, then you are really benchmarking the disk, and not Java. I would also suggest that if your CPU is not busy, then you are probably experience some other bottle neck.

Don't use a buffer if you don't need to.

Why copy to memory if your target is another disk or a NIC? With larger files, the latency incured is non-trivial.

Like other have said, use FileChannel.transferTo() or FileChannel.transferFrom(). The key advantage here is that the JVM uses the OS's access to DMA (Direct Memory Access), if present.(This is implementation dependent, but modern Sun and IBM versions on general purpose CPUs are good to go.) What happens is the data goes straight to/from disc, to the bus, and then to the destination...by passing any circuit through RAM or the CPU.

The web app I spent my days and night working on is very IO heavy. I've done micro benchmarks and real-world benchmarks to. And the results are up on my blog, have a look-see:

• Real world performance metrics: java.io vs. java.nio
• Real world performance metrics: java.io vs. java.nio (The Sequel)

Use production data and environments

Micro-benchmarks are prone to distortion. If you can, make the effort to gather data from exactly what you plan to do, with the load you expect, on the hardware you expect.

My benchmarks are solid and reliable because they took place on a production system, a beefy system, a system under load, gathered in logs. Not my notebook's 7200 RPM 2.5" SATA drive while I watched intensely as the JVM work my hard disc.

What are you running on? It matters.

#!/bin/bash

if [ -z "$JAVA_HOME" ]
then
    echo "\$JAVA_HOME must be defined"
    exit -1
fi

if [ $# -eq 0  ]; then
    echo "Invalid argument count. Please input $pid of java process"
    exit -1
fi

pid=$1
jstackBin="$JAVA_HOME/bin/jstack"
jmapBin="$JAVA_HOME/bin/jmap"
dateStr=`date '+%Y%m%d_%H%M%S'`
dumpFile=threadDump.$dateStr

# init
touch dumpFile
echo $dateStr > $dumpFile
echo "" >> $dumpFile
echo "### ps" >> $dumpFile
echo "" >> $dumpFile
ps -ef | grep $pid | grep -v grep >> $dumpFile

# top result
echo "" >> $dumpFile
echo "### top result" >> $dumpFile
echo "" >> $dumpFile
top -cb -n 1 | head -n 12 >> $dumpFile

# all cpu ratio
echo "" >> $dumpFile
echo "### all cpu (sar -P ALL)" >> $dumpFile
echo "" >> $dumpFile
sar -P ALL 1 1 >> $dumpFile

# runq
echo "" >> $dumpFile
echo "### runq (sar -q)" >> $dumpFile
echo "" >> $dumpFile
sar -q 1 1 >> $dumpFile

# all netstat
echo "" >> $dumpFile
echo "### netsat " >> $dumpFile
echo "" >> $dumpFile
netstat -an >> $dumpFile

# cpu ratio of java thread
echo "" >> $dumpFile
echo "### cpu ratio of java thread" >> $dumpFile
echo "" >> $dumpFile
echo "cpu  thread-id" >> $dumpFile
ps -mo pcpu,lwp -p31527 | awk '{if ($2 ~/[0-9]/) {print $2  "% " $1""}}' | sort -k 1 -r >> $dumpFile 2>&1
echo "" >> $dumpFile

# heap memory (native heap + java heap)
echo "" >> $dumpFile
echo "### native heap" >> $dumpFile
echo "" >> $dumpFile
ps -p $pid -o pid,vsz,rss,drs,%mem >> $dumpFile 2>&1
echo "" >> $dumpFile

# thread dump
echo "" >> $dumpFile
echo "### thread dump" >> $dumpFile
echo "" >> $dumpFile
$jstackBin -F $pid >> $dumpFile 2>&1

# jmap  heap summary
echo "" >> $dumpFile
echo "### heap summary " >> $dumpFile
echo "" >> $dumpFile
$jmapBin -F -heap $pid >> $dumpFile 2>&1

# jmap histogram
echo "" >> $dumpFile
echo "### heap historam " >> $dumpFile
echo "" >> $dumpFile
$jmapBin -F -histo $pid | head -n 200 >> $dumpFile 2>&1

echo "system & java data dump : $dumpFile"

class RunnableThread implements Runnable {

        Thread runner;
        public RunnableThread() {
        }
        public RunnableThread(String threadName) {
                runner = new Thread(this, threadName); // (1) Create a new thread.
                System.out.println(runner.getName());
                runner.start(); // (2) Start the thread.
        }
        public void run() {
                //Display info about this particular thread
                System.out.println(Thread.currentThread());
        }
}

public class RunnableExample {

        public static void main(String[] args) {
                Thread thread1 = new Thread(new RunnableThread(), "thread1");
                Thread thread2 = new Thread(new RunnableThread(), "thread2");
                RunnableThread thread3 = new RunnableThread("thread3");
                //Start the threads
                thread1.start();
                thread2.start();
                try {
                        while(true) {
                        //delay for one second
                        Thread.currentThread().sleep(0);
;
                        }
                } catch (InterruptedException e) {
                }
                //Display info about the main thread
                System.out.println(Thread.currentThread());
        }
}

### ps

www       8055  6211  0 19:21 pts/1    00:00:00 /bin/bash ./test.sh 31527
www      31527 30883 99 Feb01 pts/0    1-01:05:58 /home/www/jdk6/bin/java RunnableExample

### top result

top - 19:21:20 up 36 days,  4:44,  2 users,  load average: 1.00, 1.00, 1.00
Tasks: 162 total,   1 running, 161 sleeping,   0 stopped,   0 zombie
Cpu(s):  0.1%us,  0.2%sy,  0.0%ni, 99.7%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
Mem:  12273860k total,  4505204k used,  7768656k free,   375084k buffers
Swap:  2096472k total,        0k used,  2096472k free,  3825760k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND                                          
31527 www       15   0 1171m  12m 6504 S 99.4  0.1   1505:59 /home/www/jdk6/bin/java RunnableExample          
    1 root      15   0 10344  680  572 S  0.0  0.0   0:01.37 init [3]                                         
    2 root      RT  -5     0    0    0 S  0.0  0.0   0:00.04 [migration/0]                                    
    3 root      34  19     0    0    0 S  0.0  0.0   0:00.02 [ksoftirqd/0]                                    
    4 root      RT  -5     0    0    0 S  0.0  0.0   0:00.00 [watchdog/0]                                     

### all cpu (sar -P ALL)

Linux 2.6.18-164.el5 (blgdbs101)        2012³â 02¿ù 02ÀÏ

19½Ã 21ºÐ 20ÃÊ       CPU     %user     %nice   %system   %iowait    %steal     %idle
19½Ã 21ºÐ 21ÃÊ       all      2.50      0.00      5.83      0.00      0.00     91.67
19½Ã 21ºÐ 21ÃÊ         0     30.00      0.00     70.00      0.00      0.00      0.00
19½Ã 21ºÐ 21ÃÊ         1      0.00      0.00      0.00      0.00      0.00    100.00
19½Ã 21ºÐ 21ÃÊ         2      0.00      0.00      0.00      0.00      0.00    100.00
19½Ã 21ºÐ 21ÃÊ         3      0.00      0.00      0.00      0.00      0.00    100.00
19½Ã 21ºÐ 21ÃÊ         4      0.00      0.00      0.00      0.00      0.00    100.00
19½Ã 21ºÐ 21ÃÊ         5      0.00      0.00      0.00      0.00      0.00    100.00
19½Ã 21ºÐ 21ÃÊ         6      0.00      0.00      0.00      0.00      0.00    100.00
19½Ã 21ºÐ 21ÃÊ         7      0.00      0.00      0.00      0.00      0.00    100.00
19½Ã 21ºÐ 21ÃÊ         8      0.00      0.00      0.00      0.00      0.00    100.00
19½Ã 21ºÐ 21ÃÊ         9      0.00      0.00      0.00      0.00      0.00    100.00
19½Ã 21ºÐ 21ÃÊ        10      0.00      0.00      0.99      0.00      0.00     99.01
19½Ã 21ºÐ 21ÃÊ        11      0.00      0.00      0.00      0.00      0.00    100.00

Average:          CPU     %user     %nice   %system   %iowait    %steal     %idle
Average:          all      2.50      0.00      5.83      0.00      0.00     91.67
Average:            0     30.00      0.00     70.00      0.00      0.00      0.00
Average:            1      0.00      0.00      0.00      0.00      0.00    100.00
Average:            2      0.00      0.00      0.00      0.00      0.00    100.00
Average:            3      0.00      0.00      0.00      0.00      0.00    100.00
Average:            4      0.00      0.00      0.00      0.00      0.00    100.00
Average:            5      0.00      0.00      0.00      0.00      0.00    100.00
Average:            6      0.00      0.00      0.00      0.00      0.00    100.00
Average:            7      0.00      0.00      0.00      0.00      0.00    100.00
Average:            8      0.00      0.00      0.00      0.00      0.00    100.00
Average:            9      0.00      0.00      0.00      0.00      0.00    100.00
Average:           10      0.00      0.00      0.99      0.00      0.00     99.01
Average:           11      0.00      0.00      0.00      0.00      0.00    100.00

### runq (sar -q)

Linux 2.6.18-164.el5 (blgdbs101)        2012³â 02¿ù 02ÀÏ

19½Ã 21ºÐ 21ÃÊ   runq-sz  plist-sz   ldavg-1   ldavg-5  ldavg-15
19½Ã 21ºÐ 22ÃÊ         1       233      1.00      1.00      1.00
Average:            1       233      1.00      1.00      1.00

### netsat

Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address               Foreign Address             State     
tcp        0      0 0.0.0.0:10560               0.0.0.0:*                   LISTEN     
tcp        0      0 0.0.0.0:544                 0.0.0.0:*                   LISTEN     
tcp        0      0 0.0.0.0:10561               0.0.0.0:*                   LISTEN     
tcp        0      0 0.0.0.0:6051                0.0.0.0:*                   LISTEN     
tcp        0      0 0.0.0.0:873                 0.0.0.0:*                   LISTEN     
tcp        0      0 0.0.0.0:22                  0.0.0.0:*                   LISTEN     
tcp        0      0 0.0.0.0:2105                0.0.0.0:*                   LISTEN     
tcp        0      0 0.0.0.0:543                 0.0.0.0:*                   LISTEN     
tcp        0      0 1.2.80.92:2105            1.2.22.70:53828           ESTABLISHED
tcp        0      0 1.2.80.92:55785           1.2.235.21:35001          ESTABLISHED
tcp        0      0 1.2.80.92:2105            1.2.22.70:39864           ESTABLISHED
tcp        0      0 1.2.80.92:53006           1.2.235.22:35001          ESTABLISHED
udp    51912      0 0.0.0.0:333                 0.0.0.0:*                              
udp        0      0 0.0.0.0:421                0.0.0.0:*                              
udp        0      0 0.0.0.0:10241               0.0.0.0:*                              
udp        0      0 1.2.80.92:142             0.0.0.0:*                              
udp        0      0 127.0.0.1:22               0.0.0.0:*                              
udp        0      0 0.0.0.0:121                 0.0.0.0:*                              
Active UNIX domain sockets (servers and established)
Proto RefCnt Flags       Type       State         I-Node Path
unix  2      [ ACC ]     STREAM     LISTENING     7636   /opt/nbp/noms/var/master
unix  2      [ ]         DGRAM                    2964   @/org/kernel/udev/udevd
unix  14     [ ]         DGRAM                    7046   /dev/log
unix  2      [ ]         DGRAM                    4980259
unix  2      [ ]         DGRAM                    4980239
unix  2      [ ]         DGRAM                    4843655
unix  2      [ ]         DGRAM                    4843635
unix  2      [ ]         DGRAM                    4835066
unix  2      [ ]         DGRAM                    1236651
unix  3      [ ]         STREAM     CONNECTED     7661   /opt/nbp/noms/var/master
unix  3      [ ]         STREAM     CONNECTED     7660  
unix  2      [ ]         DGRAM                    7634  
unix  2      [ ]         DGRAM                    7543  
unix  2      [ ]         DGRAM                    7344  
unix  2      [ ]         DGRAM                    7309  
unix  2      [ ]         DGRAM                    7286  
unix  2      [ ]         DGRAM                    7055  

### cpu ratio of java thread

cpu  thread-id
31546% 0.0
31545% 0.0
31544% 0.0
31543% 0.0
31542% 0.0
31541% 0.0
31540% 0.0
31539% 0.0
31538% 0.0
31537% 0.0
31536% 0.0
31535% 0.0
31534% 0.0
31533% 0.0
31532% 0.0
31531% 0.0
31530% 0.0
31529% 0.0
31528% 99.9
31527% 0.0

### native heap

  PID    VSZ   RSS   DRS %MEM
31527 1199636 12372 1199598  0.1

### thread dump

Attaching to process ID 31527, please wait...
Debugger attached successfully.
Server compiler detected.
JVM version is 19.1-b02
Deadlock Detection:

No deadlocks found.

Thread 31542: (state = BLOCKED)

Thread 31541: (state = BLOCKED)
- java.lang.Object.wait(long) @bci=0 (Interpreted frame)
- java.lang.ref.ReferenceQueue.remove(long) @bci=44, line=118 (Interpreted frame)
- java.lang.ref.ReferenceQueue.remove() @bci=2, line=134 (Interpreted frame)
- java.lang.ref.Finalizer$FinalizerThread.run() @bci=3, line=159 (Interpreted frame)

Thread 31540: (state = BLOCKED)
- java.lang.Object.wait(long) @bci=0 (Interpreted frame)
- java.lang.Object.wait() @bci=2, line=485 (Interpreted frame)
- java.lang.ref.Reference$ReferenceHandler.run() @bci=46, line=116 (Interpreted frame)

Thread 31528: (state = IN_VM)
- java.lang.Thread.sleep(long) @bci=0 (Compiled frame; information may be imprecise)
- RunnableExample.main(java.lang.String[]) @bci=57, line=30 (Compiled frame)

### heap summary

Attaching to process ID 31527, please wait...
Debugger attached successfully.
Server compiler detected.
JVM version is 19.1-b02

using thread-local object allocation.
Parallel GC with 10 thread(s)

Heap Configuration:
   MinHeapFreeRatio = 40
   MaxHeapFreeRatio = 70
   MaxHeapSize      = 1073741824 (1024.0MB)
   NewSize          = 1048576 (1.0MB)
   MaxNewSize       = 4294901760 (4095.9375MB)
   OldSize          = 4194304 (4.0MB)
   NewRatio         = 2
   SurvivorRatio    = 8
   PermSize         = 16777216 (16.0MB)
   MaxPermSize      = 67108864 (64.0MB)

Heap Usage:
PS Young Generation
Eden Space:
   capacity = 16842752 (16.0625MB)
   used     = 1347584 (1.28515625MB)
   free     = 15495168 (14.77734375MB)
   8.000972762645915% used
From Space:
   capacity = 2752512 (2.625MB)
   used     = 0 (0.0MB)
   free     = 2752512 (2.625MB)
   0.0% used
To Space:
   capacity = 2752512 (2.625MB)
   used     = 0 (0.0MB)
   free     = 2752512 (2.625MB)
   0.0% used
PS Old Generation
   capacity = 44761088 (42.6875MB)
   used     = 0 (0.0MB)
   free     = 44761088 (42.6875MB)
   0.0% used
PS Perm Generation
   capacity = 16777216 (16.0MB)
   used     = 2069280 (1.973419189453125MB)
   free     = 14707936 (14.026580810546875MB)
   12.333869934082031% used

### heap historam

Object Histogram:

num       #instances    #bytes  Class description
--------------------------------------------------------------------------
1:              4831    483496  * ConstMethodKlass
2:              8140    396296  * SymbolKlass
3:              4831    388832  * MethodKlass
4:              1886    224232  char[]
5:              320     187152  * ConstantPoolKlass
6:              320     130496  * InstanceKlassKlass
7:              294     127056  * ConstantPoolCacheKlass
8:              516     91664   byte[]
9:              1743    41832   java.lang.String
10:             390     37440   java.lang.Class
11:             529     31304   * System ObjArray
12:             480     31168   short[]
13:             743     23776   java.util.TreeMap$Entry
14:             365     19472   int[]
15:             327     14000   java.lang.Object[]
16:             41      13448   * ObjArrayKlassKlass
17:             76      6080    java.lang.reflect.Method
18:             183     5760    java.lang.String[]
19:             96      4608    java.nio.HeapCharBuffer
20:             95      4560    java.nio.HeapByteBuffer
21:             40      2880    java.lang.reflect.Field
22:             8       2624    * TypeArrayKlassKlass
23:             113     2256    java.lang.Class[]
24:             8       1856    * MethodDataKlass
25:             58      1392    java.util.Hashtable$Entry
26:             17      1360    java.util.HashMap$Entry[]
27:             12      1344    * KlassKlass
28:             71      1136    java.lang.StringBuilder
29:             10      1040    java.util.Hashtable$Entry[]
30:             8       896     java.lang.Thread
31:             13      728     java.net.URL
32:             19      608     java.util.Locale
33:             15      600     java.util.HashMap
34:             35      560     java.io.File
35:             16      512     java.util.concurrent.ConcurrentHashMap$Segment
36:             8       512     java.lang.reflect.Constructor
37:             19      496     java.util.concurrent.ConcurrentHashMap$HashEntry[]
38:             20      480     java.util.concurrent.ConcurrentHashMap$HashEntry
39:             13      416     java.lang.ref.SoftReference
40:             13      416     java.util.LinkedHashMap$Entry
41:             16      384     java.util.concurrent.locks.ReentrantLock$NonfairSync
42:             14      336     java.util.HashMap$Entry
43:             10      320     java.io.ObjectStreamField
44:             2       320     java.lang.reflect.Method[]
45:             12      288     java.security.AccessControlContext
46:             5       280     sun.nio.cs.ext.EUC_KR$Decoder
47:             11      264     java.io.ExpiringCache$Entry
48:             16      256     sun.security.action.GetPropertyAction
49:             6       240     java.util.Hashtable
50:             7       224     java.lang.ref.Finalizer
51:             9       216     java.net.Parts
52:             8       192     java.lang.OutOfMemoryError
53:             4       192     java.util.TreeMap
54:             4       184     java.lang.reflect.Field[]
55:             3       168     sun.nio.cs.ext.EUC_KR$Encoder
56:             7       168     java.util.Vector
57:             4       160     sun.misc.URLClassPath$JarLoader
58:             8       152     java.io.ObjectStreamField[]
59:             9       144     java.lang.StringBuffer
60:             6       144     java.util.ArrayList
61:             15      120     java.lang.Object
62:             1       112     java.lang.ref.Reference$ReferenceHandler
63:             2       112     java.io.ExpiringCache$1
64:             1       112     java.lang.ref.Finalizer$FinalizerThread
65:             6       96      java.io.FileDescriptor
66:             2       96      java.lang.ThreadGroup
67:             4       96      sun.reflect.NativeConstructorAccessorImpl
68:             2       96      sun.nio.cs.StreamEncoder
69:             1       96      sun.net.www.protocol.file.FileURLConnection
70:             1       80      java.util.concurrent.ConcurrentHashMap$Segment[]
71:             1       80      java.lang.ThreadLocal$ThreadLocalMap$Entry[]
72:             5       80      sun.misc.URLClassPath$3
73:             2       80      java.io.BufferedWriter
74:             2       80      java.util.StringTokenizer
75:             1       72      sun.misc.Launcher$ExtClassLoader
76:             3       72      java.lang.ref.WeakReference
77:             1       72      sun.misc.Launcher$AppClassLoader
78:             3       72      sun.nio.cs.Surrogate$Parser
79:             3       72      java.util.Stack
80:             3       72      java.lang.RuntimePermission
81:             3       72      java.lang.NoSuchMethodError
82:             4       64      java.net.URLClassLoader$1
83:             2       64      java.io.FilePermission
84:             4       64      java.lang.Class$1
85:             4       64      java.lang.reflect.Constructor[]
86:             2       64      java.security.PrivilegedActionException
87:             4       64      sun.reflect.DelegatingConstructorAccessorImpl
88:             2       64      sun.misc.URLClassPath$FileLoader$1
89:             2       64      java.io.ExpiringCache
90:             2       64      java.lang.ClassNotFoundException
91:             2       64      java.lang.Thread[]
92:             2       64      java.lang.ThreadLocal$ThreadLocalMap$Entry
93:             4       64      sun.misc.MetaIndex
94:             2       64      java.io.PrintStream
95:             4       64      java.io.FileInputStream
96:             2       64      sun.misc.URLClassPath
97:             2       64      java.security.CodeSource
98:             3       56      java.io.File[]
99:             2       48      java.net.URL[]
100:            2       48      java.lang.ref.ReferenceQueue
101:            1       48      java.util.Properties
102:            2       48      java.security.Permissions
103:            2       48      java.io.BufferedOutputStream
104:            2       48      java.lang.ref.ReferenceQueue$Null
105:            1       48      java.io.BufferedReader
106:            3       48      sun.misc.Signal
107:            3       48      java.security.ProtectionDomain[]
108:            1       48      long[]
109:            3       48      java.lang.ThreadLocal
110:            2       48      java.io.OutputStreamWriter
111:            3       48      java.nio.charset.CodingErrorAction
112:            2       48      java.io.FileOutputStream
113:            3       48      RunnableThread
114:            3       48      java.lang.Boolean
115:            3       48      java.lang.Integer
116:            1       40      sun.nio.cs.StandardCharsets$Cache
117:            1       40      sun.nio.cs.StandardCharsets$Aliases
118:            1       40      sun.nio.cs.StreamDecoder
119:            1       40      java.util.concurrent.ConcurrentHashMap
120:            1       40      sun.nio.cs.StandardCharsets$Classes
121:            5       40      java.lang.Class$3
122:            2       32      java.util.HashSet
123:            1       32      java.lang.ClassLoader$NativeLibrary
124:            1       32      java.lang.OutOfMemoryError[]
125:            1       32      sun.misc.SoftCache
126:            4       32      java.lang.ref.ReferenceQueue$Lock
127:            2       32      java.io.FilePermission$1
128:            1       32      java.util.concurrent.atomic.AtomicReferenceFieldUpdater$AtomicReferenceFieldUpdaterImpl
129:            2       32      sun.misc.NativeSignalHandler
130:            2       32      java.nio.ByteOrder
131:            1       32      java.lang.ThreadGroup[]
132:            1       32      java.util.Collections$SynchronizedMap
133:            1       32      sun.nio.cs.ext.ExtendedCharsets
134:            4       32      sun.reflect.ReflectionFactory$GetReflectionFactoryAction
135:            1       32      java.security.ProtectionDomain
136:            1       32      java.io.BufferedInputStream
137:            2       32      java.nio.charset.CoderResult
138:            1       24      java.io.FileReader
139:            1       24      sun.net.www.MessageHeader
140:            1       24      java.security.BasicPermissionCollection
141:            3       24      sun.reflect.ReflectionFactory$1
142:            1       24      java.io.UnixFileSystem
143:            1       24      java.lang.StringCoding$StringDecoder
144:            1       24      java.lang.NullPointerException
145:            1       24      java.lang.VirtualMachineError
146:            1       24      java.lang.reflect.ReflectPermission
147:            1       24      sun.misc.Launcher$AppClassLoader$1
148:            1       24      sun.nio.cs.StandardCharsets
149:            1       24      java.lang.ThreadLocal$ThreadLocalMap
150:            1       24      java.util.BitSet
151:            1       24      java.lang.ArithmeticException
152:            1       24      java.lang.StringCoding$StringEncoder
153:            1       24      sun.nio.cs.ext.EUC_KR
154:            1       24      java.lang.ref.Reference
155:            1       16      java.nio.charset.CoderResult$1
156:            1       16      java.util.Collections$EmptyMap
157:            1       16      sun.misc.Launcher$ExtClassLoader$1
158:            2       16      sun.net.www.protocol.jar.Handler
159:            1       16      java.io.FilePermissionCollection
160:            1       16      java.security.Principal[]
161:            1       16      java.util.Collections$EmptyList
162:            1       16      java.lang.StackTraceElement[]
163:            1       16      java.security.cert.Certificate[]
164:            1       16      java.security.Policy$UnsupportedEmptyCollection
165:            1       16      sun.jkernel.DownloadManager$1
166:            1       16      java.util.concurrent.atomic.AtomicInteger
167:            1       16      sun.misc.URLClassPath$FileLoader
168:            1       16      java.nio.charset.CoderResult$2
169:            1       16      sun.misc.Launcher
170:            1       16      java.security.ProtectionDomain$Key
171:            1       16      java.lang.SystemClassLoaderAction
172:            1       16      java.lang.ClassLoader$3
173:            1       8       java.lang.reflect.ReflectAccess
174:            1       8       java.net.UnknownContentHandler
175:            1       8       sun.net.www.protocol.file.Handler
176:            1       8       java.lang.System$2
177:            1       8       java.security.ProtectionDomain$2
178:            1       8       sun.misc.Unsafe
179:            1       8       java.util.Hashtable$EmptyIterator
180:            1       8       java.util.Collections$ReverseComparator
181:            1       8       java.net.URLClassLoader$7
182:            1       8       java.security.AccessControlContext$1
183:            1       8       java.lang.ref.Reference$Lock
184:            1       8       java.io.FileDescriptor$1
185:            1       8       sun.misc.Launcher$Factory
186:            1       8       java.lang.Terminator$1
187:            1       8       java.lang.Compiler$1
188:            1       8       java.util.Hashtable$EmptyEnumerator
189:            1       8       sun.jkernel.DownloadManager$2
190:            1       8       java.lang.Runtime
191:            1       8       java.nio.charset.Charset$3
192:            1       8       java.lang.String$CaseInsensitiveComparator
193:            1       8       java.util.Collections$EmptySet
194:            1       8       sun.reflect.ReflectionFactory
195:            1       8       sun.misc.ASCIICaseInsensitiveComparator
Total :         27128   2294784