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Table Of Contents
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Weaver engines always require a speed unit to run.
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Merge engines only require a speed unit when creating Email or Web output. Merge
engines involved in a Print process don't need a speed unit in order to run.
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DataMapper engines don't need speed units.
In situations where Print and Email and/or Web output are created at the same time, only the
Merge engines that create Email/Web output count towards the maximum number of speed
units for that type of output.
Spare speed units are distributed proportionally
Since the number of engines is configurable, and jobs may run concurrently, the number of
engines in use may not match the exact number of available speed units.
When there are more speed units than there are engines in use, the Connect server distributes
the speed units and the maximum 'pages' per minute to all running jobs in proportion to the
number of engines they are using.
Note
Output speed is the speed at which the output is created by the engine in question. Data mapping
and other steps in a production process are not taken into account. The throughput speed is the
speed of the entire production process. This will always be lower than the output speed.
Launching multiple engines
One single engine can only process a single job at a time and will run mostly single-threaded.
In order to benefit from multi-core systems it is recommended that several engines run in
parallel.
As a rule of thumb, you will want to run one less engine in total on a machine than the system
has cores, leaving one CPU core for the Connect Server and the operating system to use.
Modern hardware typically has both full cores and hyper-threading or logical cores. The
logical cores should not be counted as a full core when determining how many engines to use.
As a guide, count logical cores for only 25%-50% of a full core.
For example: on an Intel i7 CPU that comes with 4 cores and 4 additional hyper-threading
cores, Windows Task Manager will show 4 cores and 8 logical processors on its performance
tab. On a CPU like this, 5 or 6 engines can be configured to run in parallel.
To configure the number of engines:
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