Performs garbage collection by a different algorithm, which is faster but less efficient at compacting individual lists, and which may fail! A failure might occur if (a) there was little unused space left when the procedure was called, and (b) there was almost no garbage, and (c) the inefficient list compaction caused many lists to occupy more space after garbage collection than before. These circumstances could cause Pixie Scheme to run out of memory.
Notwithstanding, the speed advantage of
"e::alternate-full-gc" may be useful when there is plenty of space or lots of garbage.