+(defvar *bytes-consed-between-gcs*
+ #!+gencgc (* 4 (expt 10 6))
+ ;; Stop-and-copy GC is really really slow when used too often. CSR
+ ;; reported that even on his old 64 Mb SPARC, 20 Mb is much faster
+ ;; than 4 Mb when rebuilding SBCL ca. 0.7.1. For modern machines
+ ;; with >> 128 Mb memory, the optimum could be significantly more
+ ;; than this, but at least 20 Mb should be better than 4 Mb.
+ #!-gencgc (* 20 (expt 10 6)))