[Mono-bugs] [Bug 464135] New: New regexp compiler much slower (~80x) than the old one with certain regexps

[bugzilla_noreply at novell.com]

https://bugzilla.novell.com/show_bug.cgi?id=464135


           Summary: New regexp compiler much slower (~80x) than the old one
                    with certain regexps
           Product: Mono: Class Libraries
           Version: 2.2.x
          Platform: x86-64
        OS/Version: openSUSE 11.1
            Status: ASSIGNED
          Severity: Critical
          Priority: P5 - None
         Component: System
        AssignedTo: vargaz at gmail.com
        ReportedBy: mhabersack at novell.com
         QAContact: mono-bugs at lists.ximian.com
          Found By: Development


Created an attachment (id=263602)
 --> (https://bugzilla.novell.com/attachment.cgi?id=263602)
Test case

The attached test case demonstrates the issue. The source code comes from
MojoPortal 2.2.7.9 (http://mojoportal.com/). Running the test on my machine
(Intel dual core, 2.2GHz) gives the following results:

Running tests...
Time for the new regexp compiler: 00:00:46.3967490
Time for the old regexp compiler: 00:00:00.5921550
Done

Setting the severity to critical as it affects mojoportal performance (each
request takes 40+ seconds to complete) and the new engine is used by default in
the 2.2 branch. 
Exporting MONO_OLD_RX "fixes" the issue but I don't think this is a viable
solution for 2.2


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