Xerox 96 NPS manual Minimizing the start-up latency

ADJUSTING PRINT QUALITY AND SPEED

Since the DocuPrint usually decomposes more than one job at a time, the jobs are time-shared on the one processor and this will cause the decomposition time to be larger than if the DocuPrint decomposed once by itself. In the sample log, there are always 3 jobs printing at the same time and the decomposition times reported vary from 83.69 to 85.02. After submitting this job by itself, the decomposition time reported is:

Job #213 start, ftpadmin, 99995163.ps, November 19, 1996 1:05:04 pm PST Printing duplex, 300 spi, 216 x 279 mm, 139 buf

Job #213 stop, ftpadmin, 99995163.ps, November 19, 1996 1:07:17 pm PST pages: 217, decomp: 83.51, elapsed: 134.70

PPM=60x217/83.51 = 155.9 pages per minute

This is considerably higher than the maximum speed of the printer, so it is very likely that this job prints at rated speed.

Minimizing the start-up latency

There are two ways to get a measurement that minimizes the impact of the start-up latency of the printer.

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Use a stopwatch to measure the elapsed time from when the first sheet is delivered to when the last sheet is delivered to the output tray.

Take the start time and stop time from the sequencer for a larger block of jobs.

Using the second method, the same job as in the first example was submitted 10 times to measure the throughput for 2170 pages. Here is part of the log:

XEROX DOCUPRINT 96/4635/180 NPS TROUBLESHOOTING GUIDE 7-7