Target Skills:
Ability to describe the different IMAP4 and POP3 process settings. |
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IMAP4 and POP3 Process Settings
The IMAP4 and POP3 process settings directly affect how your server
performs. The default values will work for most typical environments,
but you may want to change these settings to increase performance for special
environments. Below are overviews of each setting, with links for
further discussions, from the Adminstrator's Guide.
Messaging Server can divide its work among several executing processes,
which in some cases can increase efficiency. This capability is especially
useful with multiprocessor server machines, in which adjusting the number
of server processes can allow more efficient distribution of multiple tasks
among the hardware processors.
You can specify the number of connections per IMAP4 or POP3 process.
The more simultaneous client connections your IMAP4 or POP3 service can
maintain, the better it is for clients. On the other hand, each open connection
consumes memory resources and makes demands on the I/O subsystem of your
server machine, so there is a practical limit to the number of simultaneous
sessions you can expect the server to support. The default values represent
roughly equivalent demands that can be handled by a typically configured
server machine.
The server's use of threads greatly increases execution efficiency, because
commands in progress are not holding up the execution of other commands.
Having more simultaneously executing threads means that more client requests
can be handled without delay, so that a greater number of clients can be
serviced quickly. However, there is a performance overhead to dispatching
among threads, so there is a practical limit to the number of threads the
server can make use of. The default values are high enough that it
is unlikely you would ever need to increase them.
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