[racket] Garbage collection informaton

At Thu, 29 Sep 2011 18:12:32 -0600,
Matthew Flatt wrote:
>  * If you create a log receiver within Racket, you can look for
>    messages that have a `gc-info' prefab struct (10 fields) value,
>    which provides all the information in the string message plus start
>    and end times in real time (like `current-inexact-milliseconds').
>    See section 15.4 in the Reference for more information.

If you decide to go that way, the unstable/logging collection provides
a higher-level programmatic interface to the logging system.

Vincent