[Issue 12137] New: [REG DMD2.065-b3] Huge decline in performance

[d-bugmail at puremagic.com]

https://d.puremagic.com/issues/show_bug.cgi?id=12137

           Summary: [REG DMD2.065-b3] Huge decline in performance
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: regression
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: sludwig at outerproduct.org


--- Comment #0 from Sönke Ludwig <sludwig at outerproduct.org> 2014-02-12 02:26:20 PST ---
When compiling vibe.d, the performance and memory requirements of DMD got
significantly worse (about 7x slower and up to 1.5x more memory requirement).
Some measurements in Windows/32:

DMD 2.064:    5.5 s with about 780 MiB memory used
DMD 2.065-b1: 36 s with about 880 MiB memory used
DMD 2.065-b3: 40 s with about 880 MiB memory used

Others report even higher numbers for memory usage [1] [2]. This gets critical,
as DMD-32 now fails to compile a number of existing projects due to
out-of-memory errors.

Simplest way to reproduce is with the latest DUB release candidate [3]:

$ dub fetch vibe-d --version=0.7.19-beta.3
$ dub build vibe-d --force -v

[1]:
http://forum.rejectedsoftware.com/groups/rejectedsoftware.vibed/thread/11179/
[2]:
http://forum.dlang.org/thread/52EFE127.8070504@yahoo.com?page=4#post-uckojuzmhytcyjtotomt:40forum.dlang.org
[3]: http://code.dlang.org/download

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