[racket] Memory usage stat?

Hi all,

This seems like it should be stupidly obvious, but I've been looking
through the DrRacket manual and can't find an answer to this question:

In the DrRacket status bar, what exactly does the memory quantity (to the
immediate left of the GC icon box) represent? It doesn't seem to correlate
to (current-memory-use) or anything else I can confidently discern.

(Needless to say, this seems like it should be in the manual...)

Best,
jmj
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