<div>Hi Ed,</div>
<div> </div>
<div>I had thought the failures might be due to overloading our 'Boat Anchor' brand webserver, but the failures happen whether its one or a dozen snapshots being generated. Our websites do not handle much volume as they are focused to a small group of specific private users.
</div>
<div> </div>
<div>That being said, we are switching over to a new webserver, with a separate new computer as a PostGIS database server, and saying goodbye to the P3 era. Hopefully the new hardware will help, at the very least its going to speed up our websites a lot, if not I'll dive back into the URL's that generate the snapshots.
</div>
<div> </div>
<div>Cheers,<br>Ken</div>
<div><br><br> </div>
<div><span class="gmail_quote">On 5/24/05, <b class="gmail_sendername">Ed McNierney</b> <<a href="mailto:ed@topozone.com">ed@topozone.com</a>> wrote:</span>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">
<div dir="ltr" align="left"><span><font face="Arial" color="#0000ff" size="2">Ken -</font></span></div>
<div dir="ltr" align="left"><span><font face="Arial" color="#0000ff" size="2"></font></span> </div>
<div dir="ltr" align="left"><span><font face="Arial" color="#0000ff" size="2">If you are trying to serve multiple simultaneous requests, with everything competing to write and then read files from the temp directory, the disk I/O to that drive can become a
<strong>serious</strong> bottleneck. If heavy usage is not a concern, then this may be a non-issue.</font></span></div>
<div dir="ltr" align="left"><span><font face="Arial" color="#0000ff" size="2"></font></span> </div>
<div dir="ltr" align="left"><span><font face="Arial" color="#0000ff" size="2">I have never seen failures due to MODE=MAP (rather than being caused by something else) and I've used it about a billion times (literally <g>). I would be leery of blaming failures on MODE=MAP without some diagnosis about the cause.
</font></span></div>
<div dir="ltr" align="left"><span><font face="Arial" color="#0000ff" size="2"></font></span> </div>
<div dir="ltr" align="left"><span><font face="Arial" color="#0000ff" size="2"> - Ed</font></span></div>
<div dir="ltr" align="left"><span>
<p><font size="2">Ed McNierney<br>President and Chief Mapmaker<br><a onclick="return top.js.OpenExtLink(window,event,this)" href="http://topozone.com/" target="_blank">TopoZone.com</a> / Maps a la carte, Inc.<br>73 Princeton Street, Suite 305
<br>North Chelmsford, MA 01863<br><a onclick="return top.js.OpenExtLink(window,event,this)" href="mailto:ed@topozone.com" target="_blank">ed@topozone.com</a><br>(978) 251-4242 </font></p></span></div><br>
<div lang="en-us" dir="ltr" align="left">
<hr>
<font face="Tahoma" size="2"><b>From:</b> UMN MapServer Users List [mailto:<a onclick="return top.js.OpenExtLink(window,event,this)" href="mailto:MAPSERVER-USERS@LISTS.UMN.EDU" target="_blank">MAPSERVER-USERS@LISTS.UMN.EDU
</a>] <b>On Behalf Of </b>Ken Lord<br><b>Sent:</b> Tuesday, May 24, 2005 12:48 PM<br><b>To:</b> <a onclick="return top.js.OpenExtLink(window,event,this)" href="mailto:MAPSERVER-USERS@LISTS.UMN.EDU" target="_blank">MAPSERVER-USERS@LISTS.UMN.EDU
</a><br><b>Subject:</b> Re: [UMN_MAPSERVER-USERS] Cleaning the /tmp directory<br></font><br> </div>
<div><span class="e" id="q_1040fa7864be5d84_1">
<div></div>
<div>James,</div>
<div> </div>
<div>I use the method you mentioned, 'MODE=MAP', to generate snapshots for query results. It works great to highlight each individual item returned by a map query, placed next each item's attributes.</div>
<div> </div>
<div>However, Since mapserver 4 and later have come out, often the images fail despite the log statement of 'normal execution'.</div>
<div> </div>
<div>I have simplified the maps as much as possible, and I'm sure that its not a lingering syntax difference between 3.6 (where it worked great) and 4 or later. The failures are not consistant either. Why they don't either all work or all fail, or at least all the same features queried fail consistantly? I have no idea.
</div>
<div> </div>
<div>So I'm leary about suggesting people use MODE=MAP for all their maps just to keep their temp folder's empty, especially when a simple .bat file can be used to empty them regularly.</div>
<div> </div>
<div>Cheers,</div>
<div>Ken Lord</div>
<div>Vancouver BC</div>
<div> </div></span></div></blockquote></div>