15.4 Garbage Collection
Forces an immediate garbage collection. Some effectively unreachable
data may remain uncollected, because the collector cannot prove that
it is unreachable.
The collect-garbage procedure provides some control over the
timing of collections, but garbage will obviously be collected even if
this procedure is never called.
Returns an estimate of the number of bytes of memory occupied by
reachable data from cust
. (The estimate is calculated
performing an immediate garbage collection;
performing a collection generally decreases the number returned by
.) If cust
is not provided, the
estimate is a total reachable from any custodians.
When PLT Scheme is compiled without support for memory accounting, the
estimate is the same (i.e., all memory) for any individual custodian;
see also custodian-memory-accounting-available?.
Dumps information about memory usage to the (low-level) standard