Name: krT82822 Date: 04/14/99


Please multithread javac to give better performance when compiling multiple
classes at once on multiprocessor machines, eg the stub classes
output by the idl compiler.
(Review ID: 56948)
======================================================================

Name: skT88420 Date: 12/07/99


java version "1.2.2"
HotSpot VM (1.0.1, mixed mode, build f)


(See also bug id 4229449: please multi-thread javac).

Since interfacing make with javac is difficult for various reasons, and given
that javac already has to compute much of the dependency information that make
would need, may I suggest the following:

A new option to javac, say -XbuildOnlyOutOfDate, which, when javac is given one
or more .java source files, rebuilds *only* those that it determines to be out
of date.

Thus a typical makefile could look soemthing like this:

SRCS=A.java B.java C.java

out.jar: $(SRCS)
    javac -XbuildOnlyOutOfDate $(SRCS)
    jar cvf $@ $(SRCS:%.java=%.class)

IE, make delegates all the dependency analysis and selective rebuild to javac
for the Java sources.

If javac were also multithreaded to take advantage of multiple processors and/or
to overcome I/O latency, this could beat make or a normal javac solution hands
down. A great leap forward for productivity.
(Review ID: 98733)
======================================================================