[racket] disable garbage collection

Richard Cleis wrote at 06/02/2011 02:58 PM:
> precisely inhibit GC until regular critical slices are completed, then trigger GC ASAP.

I have also wanted this, for measuring approx. GC cost when 
micro-optimizing.

> I wonder how difficult it would be to have randomly interruptible GC.  It seems impossible, but I would use it.  The Impossible is often desirable.
>   

For a hard real-time system?  I recall that there's been research on 
that, but I don't know the current state of the art.

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