Hi, the various PrintStream.println methods are inefficient: nested synchronization, multiple flushes and a scan of the input string for newlines that in the end is pointless in this context since newLine will always flush anyway (if autoflush is enabled).
While performance of printing to console/file is likely to be dominated by the I/O overheads, there are plenty of simple text processing applications using stdout to pipe output to another process for which performance of println could definitely matter. Webrev: http://cr.openjdk.java.net/~redestad/8215412/jdk.00/ Bug: https://bugs.openjdk.java.net/browse/JDK-8215412 Using a simple test program like this: public class Test { public static void main (String ... args) { for (int i = 0; i < Integer.parseInt(args[0]); i++) System.out.println(args[1]); } } ... and stating the cost of running: $ java Test 100000 tttttttttttttttttttttttttttttttttttttttttttttt | wc -l ... I get a 15-30% reduction in cycles and wall clock time (larger reduction the more output is produced). Thanks! /Claes
