We implemented the parallel garbage collector using fork system call for process generation supported in the multi-processes OS, suchas UNIX. The GC does not need a write barrier because the gc process performs marking the replica space generated by fork system call. Although Inter-Process Communication is needed in order tonotify garbagecells, the ordinary stop and collect mark-sweep GC can be easily changed to this method. We implemented the GC in the Lisp system and compared with the original mark-sweep GC
