<div dir="ltr"><br>Maybe a crazy idea, but if this proves to be an issue, what about a monitoring process that prompts the user to disable this feature when memory goes over a certain threshold?<br></div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Nov 17, 2017 at 8:21 AM, Patrick Dunford <span dir="ltr"><<a href="mailto:enzedrailmaps@gmail.com" target="_blank">enzedrailmaps@gmail.com</a>></span> wrote:<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>Most of them are geoJpeg, there are a smaller number of geoTiff<br>
</p><div><div class="h5">
<br>
<div class="m_5364448547456566204moz-cite-prefix">On 17/11/17 20:10, Matthias Kuhn wrote:<br>
</div>
<blockquote type="cite">
<p>Thanks, that's an interesting information.</p>
<p>What datatype are your rasters?<br>
</p>
<br>
<div class="m_5364448547456566204moz-cite-prefix">On 11/17/2017 03:53 AM, Patrick
Dunford wrote:<br>
</div>
<blockquote type="cite">
<p>With the second command</p>
<p>iface.mapCanvas().<wbr>setPreviewJobsEnabled(False)</p>
<p>when I run that command it drops back to 16 GB<br>
</p>
<br>
<div class="m_5364448547456566204moz-cite-prefix">On 16/11/17 23:15, Matthias Kuhn
wrote:<br>
</div>
<blockquote type="cite">
<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>
<p>Matthias<br>
</p>
<br>
<div class="m_5364448547456566204moz-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_5364448547456566204moz-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_5364448547456566204moz-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_5364448547456566204Apple-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">
<div><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)">
<span 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);float:none;display:inline!important">______________________________<wbr>_________________</span><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)">
<span 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);float:none;display:inline!important">QGIS-Developer mailing list</span><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)">
<span 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);float:none;display:inline!important"><a href="mailto:QGIS-Developer@lists.osgeo.org" target="_blank">QGIS-Developer@lists.osgeo.org</a></span><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)">
<span 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);float:none;display:inline!important">List info: <a href="https://lists.osgeo.org/mailman/listinfo/qgis-developer" target="_blank">https://lists.osgeo.org/<wbr>mailman/listinfo/qgis-<wbr>developer</a></span><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)">
<span 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);float:none;display:inline!important">Unsubscribe: <a href="https://lists.osgeo.org/mailman/listinfo/qgis-developer" target="_blank">https://lists.osgeo.org/<wbr>mailman/listinfo/qgis-<wbr>developer</a></span></div>
</blockquote>
</div>
<br>
<div>
<div style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;font-weight:normal;letter-spacing:normal;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;line-height:normal;text-align:center"><span>—</span></div>
<div style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;letter-spacing:normal;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;line-height:normal;text-align:center">
<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>
</div>
<br class="m_5364448547456566204Apple-interchange-newline" 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">
<span 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"><span><span><span><span><span><span><span><span><span><img id="m_5364448547456566204D186BD8A-F550-478C-AD02-19C4467B3C21" src="cid:part5.D0EDE736.B523B239@gmail.com"></span>
<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 class="m_5364448547456566204Apple-interchange-newline">
<br class="m_5364448547456566204Apple-interchange-newline">
<br>
</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>
</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"><b>Tim Sutton</b></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>
</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"><b>Co-founder:</b><span class="m_5364448547456566204Apple-converted-space"> </span>Kartoza</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"><b>Project chair:</b><span style="font-weight:normal"><span class="m_5364448547456566204Apple-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>
</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">Visit <a href="http://kartoza.com/" target="_blank"><span>http://kartoza.com</span></a> to
find out about open source:</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>
</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">Desktop
GIS programming services</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">Geospatial
web development</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">GIS
Training</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">Consulting
Services</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>
</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"><b>Skype</b>:
timlinux </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"><b>IRC:</b><span class="m_5364448547456566204Apple-converted-space"> </span>timlinux
on #qgis at <a href="http://freenode.net" target="_blank">freenode.net</a></div>
</span></span></span></span></span></span></span></span></span></div>
</div>
<br>
</blockquote>
<br>
<br>
<fieldset class="m_5364448547456566204mimeAttachmentHeader"></fieldset>
<br>
<pre>______________________________<wbr>_________________
QGIS-Developer mailing list
<a class="m_5364448547456566204moz-txt-link-abbreviated" href="mailto:QGIS-Developer@lists.osgeo.org" target="_blank">QGIS-Developer@lists.osgeo.org</a>
List info: <a class="m_5364448547456566204moz-txt-link-freetext" href="https://lists.osgeo.org/mailman/listinfo/qgis-developer" target="_blank">https://lists.osgeo.org/<wbr>mailman/listinfo/qgis-<wbr>developer</a>
Unsubscribe: <a class="m_5364448547456566204moz-txt-link-freetext" href="https://lists.osgeo.org/mailman/listinfo/qgis-developer" target="_blank">https://lists.osgeo.org/<wbr>mailman/listinfo/qgis-<wbr>developer</a></pre>
</blockquote>
<br>
<br>
<fieldset class="m_5364448547456566204mimeAttachmentHeader"></fieldset>
<br>
<pre>______________________________<wbr>_________________
QGIS-Developer mailing list
<a class="m_5364448547456566204moz-txt-link-abbreviated" href="mailto:QGIS-Developer@lists.osgeo.org" target="_blank">QGIS-Developer@lists.osgeo.org</a>
List info: <a class="m_5364448547456566204moz-txt-link-freetext" href="https://lists.osgeo.org/mailman/listinfo/qgis-developer" target="_blank">https://lists.osgeo.org/<wbr>mailman/listinfo/qgis-<wbr>developer</a>
Unsubscribe: <a class="m_5364448547456566204moz-txt-link-freetext" href="https://lists.osgeo.org/mailman/listinfo/qgis-developer" target="_blank">https://lists.osgeo.org/<wbr>mailman/listinfo/qgis-<wbr>developer</a></pre>
</blockquote>
<br>
<br>
<fieldset class="m_5364448547456566204mimeAttachmentHeader"></fieldset>
<br>
<pre>______________________________<wbr>_________________
QGIS-Developer mailing list
<a class="m_5364448547456566204moz-txt-link-abbreviated" href="mailto:QGIS-Developer@lists.osgeo.org" target="_blank">QGIS-Developer@lists.osgeo.org</a>
List info: <a class="m_5364448547456566204moz-txt-link-freetext" href="https://lists.osgeo.org/mailman/listinfo/qgis-developer" target="_blank">https://lists.osgeo.org/<wbr>mailman/listinfo/qgis-<wbr>developer</a>
Unsubscribe: <a class="m_5364448547456566204moz-txt-link-freetext" href="https://lists.osgeo.org/mailman/listinfo/qgis-developer" target="_blank">https://lists.osgeo.org/<wbr>mailman/listinfo/qgis-<wbr>developer</a></pre>
</blockquote>
<br>
<br>
<fieldset class="m_5364448547456566204mimeAttachmentHeader"></fieldset>
<br>
<pre>______________________________<wbr>_________________
QGIS-Developer mailing list
<a class="m_5364448547456566204moz-txt-link-abbreviated" href="mailto:QGIS-Developer@lists.osgeo.org" target="_blank">QGIS-Developer@lists.osgeo.org</a>
List info: <a class="m_5364448547456566204moz-txt-link-freetext" href="https://lists.osgeo.org/mailman/listinfo/qgis-developer" target="_blank">https://lists.osgeo.org/<wbr>mailman/listinfo/qgis-<wbr>developer</a>
Unsubscribe: <a class="m_5364448547456566204moz-txt-link-freetext" href="https://lists.osgeo.org/mailman/listinfo/qgis-developer" target="_blank">https://lists.osgeo.org/<wbr>mailman/listinfo/qgis-<wbr>developer</a></pre>
</blockquote>
<br>
<br>
<fieldset class="m_5364448547456566204mimeAttachmentHeader"></fieldset>
<br>
<pre>______________________________<wbr>_________________
QGIS-Developer mailing list
<a class="m_5364448547456566204moz-txt-link-abbreviated" href="mailto:QGIS-Developer@lists.osgeo.org" target="_blank">QGIS-Developer@lists.osgeo.org</a>
List info: <a class="m_5364448547456566204moz-txt-link-freetext" href="https://lists.osgeo.org/mailman/listinfo/qgis-developer" target="_blank">https://lists.osgeo.org/<wbr>mailman/listinfo/qgis-<wbr>developer</a>
Unsubscribe: <a class="m_5364448547456566204moz-txt-link-freetext" href="https://lists.osgeo.org/mailman/listinfo/qgis-developer" target="_blank">https://lists.osgeo.org/<wbr>mailman/listinfo/qgis-<wbr>developer</a></pre>
</blockquote>
<br>
<br>
<fieldset class="m_5364448547456566204mimeAttachmentHeader"></fieldset>
<br>
<pre>______________________________<wbr>_________________
QGIS-Developer mailing list
<a class="m_5364448547456566204moz-txt-link-abbreviated" href="mailto:QGIS-Developer@lists.osgeo.org" target="_blank">QGIS-Developer@lists.osgeo.org</a>
List info: <a class="m_5364448547456566204moz-txt-link-freetext" href="https://lists.osgeo.org/mailman/listinfo/qgis-developer" target="_blank">https://lists.osgeo.org/<wbr>mailman/listinfo/qgis-<wbr>developer</a>
Unsubscribe: <a class="m_5364448547456566204moz-txt-link-freetext" href="https://lists.osgeo.org/mailman/listinfo/qgis-developer" target="_blank">https://lists.osgeo.org/<wbr>mailman/listinfo/qgis-<wbr>developer</a></pre>
</blockquote>
<br>
</div></div></div>
<br>______________________________<wbr>_________________<br>
QGIS-Developer mailing list<br>
<a href="mailto:QGIS-Developer@lists.osgeo.org">QGIS-Developer@lists.osgeo.org</a><br>
List info: <a href="https://lists.osgeo.org/mailman/listinfo/qgis-developer" rel="noreferrer" target="_blank">https://lists.osgeo.org/<wbr>mailman/listinfo/qgis-<wbr>developer</a><br>
Unsubscribe: <a href="https://lists.osgeo.org/mailman/listinfo/qgis-developer" rel="noreferrer" target="_blank">https://lists.osgeo.org/<wbr>mailman/listinfo/qgis-<wbr>developer</a><br></blockquote></div><br><br clear="all"><br>-- <br><div class="gmail_signature" data-smartmail="gmail_signature">Alessandro Pasotti<br>w3: <a href="http://www.itopen.it" target="_blank">www.itopen.it</a></div>
</div>