RFR: 8014510: Fix sjavac on all platforms in jprt

[Magnus Ihse Bursie]

On 2014-08-22 16:20, Erik Joelsson wrote:
> Thanks for looking into this. I took the liberty of tuning this some 
> more and finally arrived at this set of changes:
>
> http://cr.openjdk.java.net/~erikj/8014510/webrev.root.01/
>
> First of all I wanted to get rid of the big if-else construct, so I 
> changed that into a simple MEMORY_SIZE/2 for sjavac server mx flag. 
> Then I did some tests on my machine and with the modules build, sjavac 
> really isn't that memory intensive anymore. I set a cap at 2GB (1,5 
> for 32 bit jvms) and also set a minimum of 512M, which I have verified 
> still works. I also removed the verbosegc flag.
>
> When changing these settings, it struck me that the mx in 
> BIG_JAVA_FLAGS is a static configuration and should probably also be 
> tuned in the same way. I left the old values as the maximum caps and 
> let them go as low as 512. This has also been verified to be enough.
>
> Finally, since the memory requirements of the java instances in the 
> build have been reduced, I also chose to tweak the memory based 
> limiter on the default number of jobs.

Looks good to me.

/Magnus