User`s guide

buffersizes
Syntax: buffersizes integer1 integer2 integer3 integer4
Function Returns configuration, in bytes, of the frame, fontcache,
displaylist and communications buffer sizes.
Default 1028096 bytes - frame buffer
153600 bytes - font cache buffer
65536 bytes - displaylist buffer
24576 bytes - host communictions buffer
fontcachesize
Syntax: fontcachesize integer
Function Returns sum of virtual memory currently allocated to
the font cache size.
getallfontcachesizes
Syntax: getallfontcachesizes integer integer integer integer
Function Returns four integers indicating the maximum,
minimum, current, and default font cache configuration
of virtual memory currently allocated within the total
sum of font cache size. These numbers are not reflected
when using the operators buffersizes or vmstatus.
Chapter 10
10-20 PostScript: Operator Dictionary