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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>
<desc><xref href="GUID-8F1567B4-6957-5B93-9499-35489AD610F5.dita">chunks</xref></desc>
</link>
<link href="GUID-7287F1D4-023E-5C90-91E1-6D8DF78D8241.dita"><linktext>Virtual machine
model</linktext></link>
</related-links></concept>