QMS 4060 Technical Information download pdf (Page 158)

Memory

QMS 4060 Print System Reference5-16

PostScript Font Cache

Also known as K Mem PS Fonts and Font Cache, this memory client

stores bitmapped representations of previously scaled PostScript

fonts. This process reduces the number of times a font must be con-

verted from outline form to bitmap form. Printing pages that have

characters already stored in the font cache is immensely faster than

printing characters not yet in the font cache.

As the font cache memory fills, the printer makes room for new bit-

mapped characters by erasing those that have been in the cache

longest without being used. By increasing the memory allocated to

this client, the printer can store more characters and spend less time

erasing and replacing characters in the cache. You should be careful

when increasing this client because the printer may spend more time

searching the cache than it would scaling the character. This client

has a limit to the maximum point size it will store.

Normally, you don’t need to change this memory client unless you

use a large number of fonts at various point sizes. If you do, you may

allocate additional memory to this client to improve printer perfor-

mance. There’s no specific formula to use in figuring the amount of

memory required by the font cache, but after a certain point, large font

caches cause the printer to take longer to print than smaller font

caches because of the search time through the cache. The recom-

mended font cache size is in the following ranges:

n 128-256 KB for 300x300 dpi printing

n 256-512 KB for 600x600 dpi printing

You should experiment to see what font cache size works best for

you.

PS Heap

Also known as K Mem PSHeap, Heap, PostScript VM, and Virtual

Memory, this client holds downloaded fonts, PostScript operators, and

forms.

Inefficiently coded PostScript jobs can consume an extremely large

amount of virtual memory or leave objects in the PostScript heap after

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QMS 4060 Technical Information Page 158