Garbage collector in Common lisp?

Question

Is SBCL or CMUCL garbage collector available in Lisp implementation?

Answer 1

SBCL exposes some of its GC functionality: http://john.freml.in/sbcl-optimise-gc

Answer 2

Both of them provide garbage collection.

See this for CMUCL and this for SBCL.

Quote from Wikipedia:

Garbage collection was invented by John McCarthy around 1959 to solve problems in Lisp.

Every Common Lisp implementation, must have garbage collection defined, since any standard implementation must comply to Common Lisp ANSI standard.