ByteBuffer has a compact() method which is useful for re-using a buffer
if it is not full consumed. However, in the likely case it is consumed,
it can perform surprising badly.
while (in.read(buf) >= 0 || buf.position != 0) {
buf.flip();
out.write(buf);
buf.compact(); // In case of partial write
}
In my application, the throughput increased by 6% by replacing compact() with this method.
public static void compact(ByteBuffer bb) {
if (bb.remaining() == 0)
bb.clear();
else
bb.compact();
}
Note: this is not the increase in a micro-benchmark, but across the entire application!
Your Mileage May Vary of course
From http://vanillajava.blogspot.com/2011/11/stupid-performance-trick-in-java.html
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