RFR: JDK-8166965: Some small java build tools are still running with big JVM configuration

Magnus Ihse Bursie magnus.ihse.bursie at oracle.com
Mon Oct 3 07:04:41 UTC 2016

On 2016-09-30 16:45, Erik Joelsson wrote:
> A while back, we introduced the JAVA_SMALL configuration in the build, 
> which improved build performance and reduced resource usage for 
> several small java instances. However, it was never fully applied to 
> all command lines where it would fit.
> I have looked through the entire build and measured performance with 
> the current "BIG" configuration vs the "SMALL" one. In all cases, the 
> small config won, especially when measuring total user time, but also 
> for wall clock time. The total impact on a full build is of course 
> small, since we already hit the low hanging fruit previously, but it's 
> still nice to take this optimization all the way.
> On my Linux workstation, I save about 3 minutes of user time and a few 
> seconds of wall clock. On a macpro, 2 minutes of user time and a few 
> seconds of wall clock.
> Bug: https://bugs.openjdk.java.net/browse/JDK-8166965
> Webrev: http://cr.openjdk.java.net/~erikj/8166965/webrev.01

Looks good to me. Thanks for continuing to improve performance!

Just a few questions:

* I can't see how the changes in MainSupport.gmk fits in. Is that a 
separate issue you fixed?

* Where do we have the "big" configuration? The module compilations? 


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