grt@twitch.UUCP ( G.R.Tomasevich) (03/05/86)
These are the two we have. I used a 564-block (285684 bytes) file of station message detail records, which has mostly digits and spaces. Each line is a record of telephone call info from a field experiment. The system in 5.2 on a VAX-11/785 with a heavy load, according to a system monitor running in a layer on my Blit. Both real time ~ 45 sec. command compression comp size user sys - original 564 blks - - pack 57.8% 239 blks 7.33s 2.70s compress 78.27% 131 blks 8.38 1.96s I have over 4k blocks of these compressed files, so the advantage of compress is obviously worthwhile. Another example is binary data from a terminal in the field experiment; real time 112 sec and 77 sec respectively: command compression comp size user sys - original 1466 blks - - pack 65.3% 510 blks 17.46s 9.46s compress 89.50% 163 blks 17.51s 5.00s We have tens of thousands of blocks (compressed) of these. -- George Tomasevich, ihnp4!twitch!grt AT&T Bell Laboratories, Holmdel, NJ