[racket] DrRacket 6.1 or Hardware Issue?

I've pushed a fix for DrRacket so that it limits online expansion to
the same limits that are in place for running programs.

Thanks,
Robby

On Mon, Sep 8, 2014 at 4:23 PM, Sean Kanaley <skanaley at gmail.com> wrote:
> After investigating a near complete lock up some more (saved by TTY window
> and killing DrRacket after seeing it with 3GB+ residency), it's clearly
> correlated with background expansion of an accidentally infinitely looping
> macro. A few questions..
>
> 1. Is the OS supposed to break and enter an infinite swap loop? If that is
> just a fact of life for a program requesting too much memory simultaneously
> (and an ever increasing amount), well for example ghc just shuts itself down
> claiming "too much memory requested" or something like that.
>
> 2. Is this related to my very long time ago issue where I removed a bad 1GB
> from the 3rd slot, lazily leaving the 4th slot where it is, causing me to
> have 3GB instead of 4, even though it's "supposed to" have 4 based on the
> max slot (I have never encountered this sort of system freeze before
> however)? Maybe the OS would more gracefully handle the paging?
>
> 3. Can DrRacket simply realize it's expanding the same thing and not demand
> infinite memory (I don't understand the system on the implementation level,
> sorry if that's off base).
>
> The solution, aside from me not writing incorrect macros is to disable
> background expansion. Relatedly, DrRacket doesn't seem able to reclaim this
> space without being restarted. Closing the file and clicking the garbage
> collection thing only recovers say 20MB out of 2GB if I turn off expansion
> before the OS locks.
>
> Lastly, a related possible bug I've encountered since 6.1 is the infinite
> garbage collection loop, where the OS remains responsive but DrRacket has to
> be restarted, but this one I have no idea where it comes from only that it
> seems to happen after a while, and fairly reliably so.
>
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