On Wed, 5 Nov 2003, Jerome Alet wrote:

JA> Say with your solution, the user can still print one 1000 pages
JA> document even if his quota allows him to print only 20.

Yes, which is defined as acceptable in the requirements speficiation of
the system.

JA> With mine I agree he can print 15 * 1000 pages documents in this
JA> situation, but in reality will this ever happen ? He would be in
JA> serious debt anyway since accounting is still done.

The thing is, printers go off-line, they go off to service (or get on
location service). When replacing toner or doing repairs you manually
print test pages on the printer. That's why it is nice to have
accounting finished at the end of the job. Otherwise some poor user will
get to pay for the test pages.

JA> This is not correct (I understand you may not need it though) : even
JA> with only ghostview you can know in advance how many pages there are
JA> in your document, and so its cost.

But there is no way to notify a user of this via the lp protocol and offer
a yes/no question.

JA> Say you have different printers, for each one you define some cost per
JA> page and/or per job. For example you've got two laser printers, one
JA> for which the toner cartrige costs much more than for the other one,
JA> but you use the same paper in both. The user can then easily learn on
JA> which printer the job is cheaper for him and choose the printer
JA> accordingly.

True, but we don't get that advanced. Due to the amount we print the cost
per page pretty much averages out, black or colour prints. Also, this is
less important, as a black printout may cost more (if it is 100% black)
than a colour one (if it is 1% coloured).

Also, our students do not have much choice. All printers are the same
brand and they have default printes defined depending on workstation and
lab.

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