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<h3 class="section">22.4 Querying memory available resources</h3>

<p>The amount of memory available in the system and the way it is organized
determines oftentimes the way programs can and have to work.  For
functions like <code>mmap</code> it is necessary to know about the size of
individual memory pages and knowing how much memory is available enables
a program to select appropriate sizes for, say, caches.  Before we get
into these details a few words about memory subsystems in traditional
Unix systems will be given.

<ul class="menu">
<li><a accesskey="1" href="Memory-Subsystem.html#Memory-Subsystem">Memory Subsystem</a>:            Overview about traditional Unix memory handling. 
<li><a accesskey="2" href="Query-Memory-Parameters.html#Query-Memory-Parameters">Query Memory Parameters</a>:     How to get information about the memory
                                subsystem? 
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