Optimizing IO Performance

For better IO performance when using Input / Output streams for large files:

• Don't use the API that reads one byte at a time.
• Read a byte[] at a time.
• Use BufferedInputStream / BufferedOutputStream. Set large buffers if necessary.

Example:

int bufferSize = 32768;

byte[] buf = new byte[bufferSize];

int bytesRead = 0;

while((bytesRead = bufferedInputStream.read(buf)) != -1) {

    if(bytesRead < bufferSize) {

        buf = Arrays.copyOfRange(buf, 0, bytesRead);

    }

    // Do something with buf
}