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<!DOCTYPE concept

  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">

<concept id="GUID-A16508C2-2743-5E36-BCFB-C509ACCD372F" xml:lang="en"><title>Fixed

Processes</title><shortdesc>A fixed process is a process in which its chunks always reside

at the same linear address - their home address; only their access permissions

are modified during a context switch. </shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>

<p>The usual re-mapping from the data section to the home section is not done

and greatly improves performance.</p>

<p>Fixed processes do not see the virtual machine model; each process must

have its data at a different linear address. It is, therefore, not possible

to run multiple copies of a fixed process.</p>

<p>Fixed processes are suitable only for system server processes such as the

file server, window server etc. since the majority of context switches involve

these processes.</p>

</conbody><related-links>

<link href="GUID-8F1567B4-6957-5B93-9499-35489AD610F5.dita"><linktext>chunks</linktext>

</link>

<link href="GUID-7287F1D4-023E-5C90-91E1-6D8DF78D8241.dita"><linktext>Virtual machine

model</linktext></link>