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4.
Click OK or Apply.
Number of speed units for Email and Web
Although assigning parallel speed units to Email and HTML jobs is possible (on the Merge
Engine settings page), it is advised to use only one speed unit per job, firstly because these
jobs are usually small.
Secondly, HTML jobs need to be handled as soon as possible, particularly if a request was
made over the internet; you don't want those jobs to be kept waiting until the required number of
speed units becomes available.
Email output doesn't benefit much from speed units, because most time is spent on
communicating with an external SMTP server.
Dividing processing power over jobs
There is a number of ways in which you can divide processing power over output operations of
a certain kind and/or size.
l
By reserving Merge engines for jobs of a certain kind (and size, in the case of a Print
job). Note that reserved engines cannot be used by any other type of job. This means
there will be fewer engines to handle other jobs. Consequently, the other jobs may take
more time and may have to wait (or wait longer). However, if the server receives many
web requests then having engines reserved for HTML output can help performance.
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By setting the maximum number of Merge engines that can handle jobs of a certain
kind, or (in case of Print jobs) size, concurrently. This setting is useful to ensure that
there will always be some Merge engines available for jobs of another size or kind.
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By requiring a number of parallel engines for Print jobs of a certain size (see "Number of
parallel engines per Print job" on page113). More parallel engines will make them run
faster, but they will have to wait (longer) if the required number of engines - and speed
units - isn't available when they come in.
l
By reserving speed units for Print jobs of a certain size.
l
By setting the maximum number of speed units to use for Print jobs of a certain size.
This setting is useful to ensure that there will always be some speed units available for
other Print jobs. It also limits the number of Print jobs of that size that can run concurrently:
if, for example, large Print jobs require 4 parallel engines, and the maximum number of
speed units for large Print jobs is also 4, only one large Print job can run at a time.
All of these engine configuration settings are found in the Scheduling Preferences:
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