<div dir="ltr"><div><div><div>Hi,<br><br></div>I was wondering if these preview jobs are enabled in QGIS Server context, when requesting a GetMap from any client. I am pretty sure the context of the preview jobs execution is related to Desktop, but I would like to be sure.</div><div>Any hint on this ?</div><div><br></div>Regards,<br></div>Michaël<br></div><div class="gmail_extra"><br><div class="gmail_quote">2017-11-16 11:15 GMT+01:00 Matthias Kuhn <span dir="ltr"><<a href="mailto:matthias@opengis.ch" target="_blank">matthias@opengis.ch</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF">
<p>Hi Patrick,</p>
<p>Would be interesting to do this test with previews enabled and
disabled. Then we'll see if it's actually the previews or some
other mechanism that is causing this.<br>
</p>
<p>IIRC only a composite image is saved in the preview jobs and not
each layer separately, but that's just what I remember and not
evidence based.<br>
</p>
<p> You can enable them in the python console with</p>
<p> iface.mapCanvas().<wbr>setPreviewJobsEnabled(True)</p>
<p>and disable with</p>
<p> iface.mapCanvas().<wbr>setPreviewJobsEnabled(False)</p>
<p>Thanks for a feedback</p><span class="HOEnZb"><font color="#888888">
<p>Matthias<br>
</p></font></span><div><div class="h5">
<br>
<div class="m_6208825008050013630moz-cite-prefix">On 11/16/2017 08:42 AM, Patrick Dunford
wrote:<br>
</div>
<blockquote type="cite">
<p>In my current project using Qgis 2.99, turning off the rasters
uses 16 GB, turning them on uses 52 GB</p>
<p>I do not believe it is independent from the number of layers
that are being displayed.</p>
<p>Previous versions of the software did not cache every single
raster (the number of rasters actually being displayed on the
canvas at any one time is a small fraction of the total number
in the project)</p>
On 16/11/17 20:11, Matthias Kuhn wrote:<br>
<blockquote type="cite">
<p>Hi Patrick,</p>
<p>This uses some memory (~ canvas width pixels * canvas height
pixels * 8 preview images * 32 bit RGBA), so let's assume 50
MB to 100 MB.</p>
<p>This consumption is independent from the number or type of
layers.</p>
<p>Matthias<br>
</p>
<br>
<div class="m_6208825008050013630moz-cite-prefix">On 11/16/2017 08:02 AM, Patrick
Dunford wrote:<br>
</div>
<blockquote type="cite">
<p>So to put it another way this is the reason why Qgis wants
to use a huge amount of memory (40 GB) when I have a lot of
raster images loaded in the background. <br>
</p>
<br>
<div class="m_6208825008050013630moz-cite-prefix">On 16/11/17 18:56, Tim Sutton
wrote:<br>
</div>
<blockquote type="cite">
Hi<br>
<div><br>
<blockquote type="cite">
<div>On 16 Nov 2017, at 04:35, Patrick Dunford
<<a href="mailto:enzedrailmaps@gmail.com" target="_blank">enzedrailmaps@gmail.com</a>>
wrote:</div>
<br class="m_6208825008050013630Apple-interchange-newline">
<div>
<p style="white-space:pre-wrap;font-family:Helvetica;font-size:14px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;word-spacing:0px;background-color:rgb(255,255,255)">What is this "preview job" function?</p>
<br style="font-family:Helvetica;font-size:14px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255)">
</div>
</blockquote>
<div><br>
</div>
<div>Its application logic to prefetch / pre-render
offscreen content in anticipation of user panning the
map.</div>
<div><br>
</div>
<div>Regards</div>
<div><br>
</div>
<div>Tim</div>
<blockquote type="cite">
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<div style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:center;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;font-variant-ligatures:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;margin:0px;line-height:normal;min-height:14px"><br>
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<div style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:center;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;font-variant-ligatures:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;margin:0px;line-height:normal"><b>Project
chair:</b><span style="font-weight:normal"><span class="m_6208825008050013630Apple-converted-space"> </span><a href="http://QGIS.org" target="_blank">QGIS.org</a></span></div>
<div style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:center;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;font-variant-ligatures:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;margin:0px;line-height:normal;min-height:14px"><br>
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find out about open source:</div>
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timlinux </div>
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on #qgis at <a href="http://freenode.net" target="_blank">freenode.net</a></div>
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