[OpenAFS-win32-devel] Win32 Cache Question
Jeffrey Altman
jaltman@columbia.edu
Wed, 23 Jun 2004 14:28:22 -0400
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The Windows and Unix implementations are independent.
While they share some core libraries the actual client implementations
are very different.
The cache on Unix is not the same as the cache on Windows. When
persistence was
added to the Unix implementation there was no one working on the Windows
implementation.
The Windows cache uses a memory mapped file to store the file data
segments. It keeps the vnode
data in memory. In order for a persistent cache to be implemented three
things must be done:
1. synchronize the startup of all threads in the afs client service
2. store the vnode data in a memory mapped file
3. synchronize the shutdown of all threads in the afs client service
The startup/shutdown synchronization is required to preserve the
integrity of the cache data.
Jeffrey Altman
Tommie Gannert wrote:
>Just read the status list. One item was about making a persistent cache.
>
>So, how does the win32-cache work now, and why is the cache
>implementation different on Windows vs. Solaris et al.?
>
>/Tommie Gannert
>_______________________________________________
>OpenAFS-Win32-devel mailing list
>OpenAFS-Win32-devel@openafs.org
>http://lists.openafs.org/mailman/listinfo/openafs-win32-devel
>
>
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The Windows and Unix implementations are independent.<br>
While they share some core libraries the actual client implementations
are very different.<br>
The cache on Unix is not the same as the cache on Windows. When
persistence was<br>
added to the Unix implementation there was no one working on the
Windows implementation.<br>
<br>
The Windows cache uses a memory mapped file to store the file data
segments. It keeps the vnode<br>
data in memory. In order for a persistent cache to be implemented
three things must be done:<br>
<ol>
<li>synchronize the startup of all threads in the afs client service</li>
<li>store the vnode data in a memory mapped file</li>
<li>synchronize the shutdown of all threads in the afs client service
<br>
</li>
</ol>
The startup/shutdown synchronization is required to preserve the
integrity of the cache data.<br>
<br>
Jeffrey Altman<br>
<br>
<br>
Tommie Gannert wrote:<br>
<blockquote
cite="midPine.GSO.4.58.0406211148270.11753@knatte.nada.kth.se"
type="cite">
<pre wrap="">Just read the status list. One item was about making a persistent cache.
So, how does the win32-cache work now, and why is the cache
implementation different on Windows vs. Solaris et al.?
/Tommie Gannert
_______________________________________________
OpenAFS-Win32-devel mailing list
<a class="moz-txt-link-abbreviated" href="mailto:OpenAFS-Win32-devel@openafs.org">OpenAFS-Win32-devel@openafs.org</a>
<a class="moz-txt-link-freetext" href="http://lists.openafs.org/mailman/listinfo/openafs-win32-devel">http://lists.openafs.org/mailman/listinfo/openafs-win32-devel</a>
</pre>
</blockquote>
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