[Bug 53492] New: Make JspC shell multithreaded

https://issues.apache.org/bugzilla/show_bug.cgi?id=53492

          Priority: P2
            Bug ID: 53492
          Assignee: dev <at> tomcat.apache.org
           Summary: Make JspC shell multithreaded
          Severity: enhancement
    Classification: Unclassified
                OS: Mac OS X 10.4
          Reporter: dan <at> fabulich.com
          Hardware: PC
            Status: NEW
           Version: trunk
         Component: Jasper
           Product: Tomcat 7

Created attachment 29016
  --> https://issues.apache.org/bugzilla/attachment.cgi?id=29016&action=edit
patch

Jasper works great multi-threaded. Using two threads per core substantially
improves throughput on my test machine, reducing the time it takes to build
from 9 minutes to 2 minutes.

The attached patch adds a new -threadCount command-line argument to JspC, as
well as a setThreadCount setter, suitable for use in an Ant task. It accepts a
positive integer, or a core factor like "2.0C" which means two threads per
core. 2.0C is the default.

Note that on my machine it didn't help that much unless JspC was also