ghci balkiness on OS X?

[Judah Jacobson]

I haven't seen this before myself (running on OS X), though in the past we
had a report of slowdown in long-running ghci sessions which was hard to
reproduce.  What versions of GHC and OS X are you using?

Do you know if this is a problem with text entry in general or only
haskeline?  If you run the command

:m +System.IO Control.Exception Control.Monad
(hSetBuffering stdin NoBuffering >> hSetEcho stdin False >> forever
(getChar >>= \c -> putStr ['{',c,'}'])) `finally` (hSetEcho stdin True >>
hSetBuffering stdin LineBuffering)

and hold down the 'a' key, does it smoothly output "{a}{a}{a}..." or does
it have similar hiccups?

-Judah



On Tue, Oct 21, 2014 at 5:02 PM, Evan Laforge <qdunkan at gmail.com> wrote:

> On my OS X, if I load a couple hundred modules into ghci as bytecode,
> text entry gets balky and laggy.  So e.g. if I hold down a key, the
> letters will stream in but have frequent hiccups.  This seems to
> adversely affect haskeline as well, such that, using vi mode,
> sometimes ^[ to move to command mode will be lost, or it will
> spontaneously go to insert mode, or ^[ followed by 'h' will be just
> beep and remain in insert mode.  If I load most of the modules
> compiled, this doesn't happen, or at least is not nearly so bad.
>
> It doesn't seem to be due to background work by ghci or anything,
> because it doesn't matter how long I wait after loading the modules.
> My previous random guess was that increased memory use made the GC
> work more, and my pauses were due to major collections.  But when I
> try on linux, ghci remains responsive no matter how many modules I
> load, so maybe it's an OS X only problem.
>
> Do any other OS X users see this effect?
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