[racket-dev] Why did DrDr get much slower?

Indeed -- I'd have had no idea this happened at all.

On Sat, Jul 13, 2013 at 10:53 AM, Robby Findler
<robby at eecs.northwestern.edu> wrote:
> Just as an aside, drdr rules.
>
> Robby
>
>
> On Sat, Jul 13, 2013 at 9:44 AM, Sam Tobin-Hochstadt <samth at ccs.neu.edu>
> wrote:
>>
>> The DrDr running time tripled recently. This doesn't seem to be a
>> result of any one thing getting slower, but instead of all the files
>> taking longer.  To pick two random examples,
>> `racket/lib/collects/racket/match/parse-quasi.rkt` went from ~1 second
>> to ~4 seconds, and `pkgs/realm/chapter2/source.rkt` went from ~1.5
>> seconds to ~3 seconds. You can see the charts here:
>>
>>
>> http://drdr.racket-lang.org/27103/racket/lib/collects/racket/match/parse-quasi.rkt
>>     http://drdr.racket-lang.org/27103/pkgs/realm/chapter2/source.rkt
>>
>> The change where this happened was Matthew's addition of
>> `filesystem-change-evt`, which was intended to make things faster.
>>
>> This slowdown seems to be real on my machine as well --
>> realm/chapter2/source.rkt runs more than twice as slow in rev bd09a60e
>> as it does in v5.3.5. I'm testing the revision right before
>> `filesystem-change-evt` now.
>>
>> Sam
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>
>