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<div class="moz-cite-prefix">Memory mapped files with no mapping
file (i.e. file handle = 0) use (parts of) the system swap
(page) file.<br>
<br>
If you have dynamically sized swap files, they can become very
fragmented over time (and often are never defragmented).<br>
<br>
You might want to check how fragmented the page file is, and also
look at making the size of it static (this prevents any additional
fragmentation).<br>
<br>
Cheers <br>
<br>
On 12/06/2013 3:01 p.m., Ross Levis wrote:<br>
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<p class="MsoNormal"><span
style="font-size:12.0pt;color:#1F497D">Hi Rob,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;color:#1F497D">The sleep is in the
separate thread, not main thread.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;color:#1F497D">I’m not sure if in
memory mapped files can be paged to disk but will
investigate.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;color:#1F497D">Cheers,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;color:#1F497D">Ross.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;color:#1F497D"><o:p> </o:p></span></p>
<div>
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1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext"
lang="EN-US">From:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext"
lang="EN-US"> <a class="moz-txt-link-abbreviated" href="mailto:delphi-bounces@listserver.123.net.nz">delphi-bounces@listserver.123.net.nz</a>
[<a class="moz-txt-link-freetext" href="mailto:delphi-bounces@listserver.123.net.nz">mailto:delphi-bounces@listserver.123.net.nz</a>] <b>On
Behalf Of </b>Robert Martin<br>
<b>Sent:</b> Wednesday, 12 June 2013 9:05 AM<br>
<b>To:</b> NZ Borland Developers Group - Delphi List<br>
<b>Subject:</b> Re: [DUG] Memory mapped Files with no
file<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal">Hi<br>
<br>
Don't know anything about memory mapped files but two
comments...<br>
<br>
1. Try it without the sleep(). If the sleep is in the
main thread it could cause you problems.<br>
2. Perhaps you are low on RAM and the in memory file is
actually having to be paged to disk! <br>
<br>
Hope that's of some use :)<br>
Rob<br>
<br>
On 12/06/2013 12:02 a.m., Ross Levis wrote:<o:p></o:p></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoNormal"><span
style="font-size:12.0pt;color:#1F497D">I’m using a shared
memory component in 2 apps which communicate with each
other.</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;color:#1F497D">I use a shared
memory component which uses a memory mapped file with no
actual file on the hard drive.</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;color:#1F497D">I seem to be having
a problem with communications between the 2 apps when the
hard drive is busy. It appears a change to the shared
memory is not showing up in the other app for over 20
seconds while the hard drive is busy. Does that sound
possible in your opinion?</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;color:#1F497D">It doesn’t make any
sense to me but that’s all I can come up with currently.
Communication appears to stop sometimes when a separate
thread starts up every 24 hours to load the contents of
perhaps 3000 small files into RAM. There is a sleep(15)
between access of each file to prevent the drive being too
busy, but yet this issue can occur sometimes during the 30
odd seconds this thread is running.</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;color:#1F497D">Cheers,<br>
Ross.</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif""><br>
<br>
<br>
<o:p></o:p></span></p>
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