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<p>Hi Koos -</p>
<p>From your description I suspect you had a memory issue, i.e
running out of memory. It might be caused by QGIS but it's
probably caused by some other app running on your computer. Some
(badly implemented) apps are "leaking" memory, i.e: allocating
memory, but never deallocating it after use. After some time the
bad app has allocated large amounts of memory that's not available
to other apps. <br>
</p>
<p>If you are short on available memory on the computer the OS will
begin to swap contents from the memory to and from a swap-file
usually placed in the root of C: (the hard-disk containing the
OS). This can explain the sudden periodic "freezing" of QGIS: The
OS has to load pieces of out-swapped QGIS content into memory
before QGIS can continue.<br>
</p>
<p>If you additionally are short on available disk space on the
system drive and are creating some largish temp files (which
usually is placed on the system drive), the situation can rapidly
escalate to a system crash (BSOD)</p>
<p>To avoid this situation:</p>
<ul>
<li>Install more memory on your computer.</li>
<li>Only have a minimum of apps running at the same time.</li>
<li>Frequently reboot you computer (It's Windows, after all :-)</li>
<li>If you have two hard-disks on your computer: Move the temp
directory to different drive than the one containing the
swap-file. <br>
</li>
</ul>
<p>You already done the "right now"- steps anyway so the mail is
more a reminder for other readers or google-searches :-)</p>
<p>And by the way: QGIS and Postgres/PostGIS is a killer combination
:-) . IMHO it beats other GIS applications hands down. <br>
</p>
<pre class="moz-signature" cols="72">--
Med venlig hilsen / Kind regards
Bo Victor Thomsen</pre>
<p> </p>
<p> <br>
</p>
<div class="moz-cite-prefix">Den 10-04-2020 kl. 08:55 skrev Koos
Fransen:<br>
</div>
<blockquote type="cite"
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<div class="WordSection1">
<p class="MsoNormal">Dear Bo and Andreas<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US">Thank you very much for
your insights.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Given the fact that QGIS
has been more stable since yesterday, I think the problem
was related to my hard drive memory and temporary files. I
did not have a lot of space left on the hard drive, and I
tend do leave my computer on when calling it a day, so maybe
that combination was not very helpful for QGIS to work
smoothly.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I’ve deleted some data
on my laptop, thus freeing up some space and, as you said, I
deleted my temp files for QGIS (I had been working with very
large datasets), and for now everything works quite well.
I’ll also start shutting off my laptop from time to time </span><span
style="font-family:"Segoe UI Emoji",sans-serif"
lang="EN-US">😉</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I’ll keep you posted if
it should occur again and if I can find a clear solution to
the problem. Anyway, Bo, you and your wife’s list is a very
good starting point to start problem solving with should
this issue occur again. There are some things that I can
exclude as reason (build is the stable 3.10 version, it’s
not the anti-virus, it’s not a work network environment, …),
and some things that I still have to test. Many thanks for
your help (and good luck with the teaching assignment, I’m
teaching introductory courses in GIS at Vrije Universiteit
Brussel, but one of the next things I would like to dive
into is the use of PostGIS and PostgreSQL for my own
research)!<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Kind regards<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Koos<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<div>
<p class="MsoNormal" style="background:white"><span
style="font-size:8.0pt;font-family:"Century
Gothic",sans-serif;color:#8EAADB;background:white;mso-fareast-language:NL"
lang="EN-GB">-- </span><span
style="font-size:8.0pt;font-family:"Century
Gothic",sans-serif;color:#8EAADB;mso-fareast-language:NL"
lang="EN-GB"><br>
<b><span style="background:white">dr. Koos Fransen<o:p></o:p></span></b></span></p>
<p class="MsoNormal" style="background:white"><span
style="font-size:8.0pt;font-family:"Century
Gothic",sans-serif;color:#8EAADB;mso-fareast-language:NL"
lang="EN-GB">Research unit Cosmopolis (VUB)<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span
style="font-size:8.0pt;font-family:"Century
Gothic",sans-serif;color:#8EAADB;mso-fareast-language:NL"
lang="EN-GB">Research unit ISE (UGent)</span><b><span
style="font-size:8.0pt;font-family:"Century
Gothic",sans-serif;color:#8EAADB;background:white;mso-fareast-language:NL"
lang="EN-GB"><o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="mso-fareast-language:NL"
lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:white"><span
style="font-size:8.0pt;font-family:"Century
Gothic",sans-serif;color:#2F5496;mso-fareast-language:NL"
lang="EN-GB">I am available for
<u>VUB</u> on <u>Tuesdays, Thursdays and Fridays</u> and
for UGent on Mondays and Wednesdays. Consequently, I try
to structure meetings accordingly and answers to your
mails may be delayed.<o:p></o:p></span></p>
</div>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #E1E1E1
1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span
style="mso-fareast-language:NL" lang="EN-US">From:</span></b><span
style="mso-fareast-language:NL" lang="EN-US"> Andreas
Neumann <a class="moz-txt-link-rfc2396E" href="mailto:a.neumann@carto.net"><a.neumann@carto.net></a>
<br>
<b>Sent:</b> donderdag 9 april 2020 17:27<br>
<b>To:</b> Bo Victor Thomsen
<a class="moz-txt-link-rfc2396E" href="mailto:bo.victor.thomsen@gmail.com"><bo.victor.thomsen@gmail.com></a>; Koos Fransen
<a class="moz-txt-link-rfc2396E" href="mailto:Koos.Fransen@vub.be"><Koos.Fransen@vub.be></a>; <a class="moz-txt-link-abbreviated" href="mailto:qgis-user@lists.osgeo.org">qgis-user@lists.osgeo.org</a><br>
<b>Subject:</b> Re: [Qgis-user] ISSUE QGIS keeps
freezing - QGIS Desktop 3.10.4<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p>Hi,<o:p></o:p></p>
<p>These are all good points. I also had severe issues with
Antivirus - it slowed down or prevented a lot of the network
access. The IT services had to add exceptions.<o:p></o:p></p>
<p>But you describe that it only happens after a couple of days
of usage, which is strange.<o:p></o:p></p>
<p>If you find out what the issues really is, please let us
know, so we can learn.<o:p></o:p></p>
<p>Andreas<o:p></o:p></p>
<div>
<p class="MsoNormal">Am 09.04.20 um 15:20 schrieb Bo Victor
Thomsen:<o:p></o:p></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p>Hi Koos -<o:p></o:p></p>
<p>I had a talk with my wife Lene Fischer about your issues.
(She is a Assoc. Prof. teaching GIS at a department of the
University of Copenhagen using QGIS. I co-lecture with her
on the use of spatial enabled databases (PostgreSQL/
PostGIS)).
<o:p></o:p></p>
<p>She hasn't experienced the issues you describe (but some
other issues) <o:p></o:p></p>
<p>Here is some pointers:<o:p></o:p></p>
<ul type="disc">
<li class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l2
level1 lfo1">
Use a long-term releases and keep up with the point
releases 3.10.3 -> 3.10.4 (Which you do :-)<o:p></o:p></li>
<li class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l2
level1 lfo1">
Clean the temp dir regularly (Which you did :-)<o:p></o:p></li>
<li class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l2
level1 lfo1">
Check the setup of your windows pointers to user-dirs,
temp space. Sometimes they are not suited for computers
outside the university network (or inside, if the network
sucks)
<o:p></o:p></li>
<li class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l2
level1 lfo1">
Check if your logon name contains special characters
outside us-ASCII like accented character or blanks. QGIS
is fine with these but some add-on libraries is not. The
logon name can be a part of a path name that something
chokes on.<o:p></o:p></li>
<li class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l2
level1 lfo1">
Check your antivirus by temporarily disable it before
using QGIS.<o:p></o:p></li>
<li class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l2
level1 lfo1">
Check your disk space. The temp dir can "grow"
considerably during QGIS use. <o:p>
</o:p></li>
<li class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l2
level1 lfo1">
Check the amount of memory used on your computer. If you
<b>are</b> using all available ram you
<b>will</b> get the symptoms you describe<o:p></o:p></li>
<li class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l2
level1 lfo1">
Install a minimum of plugins.<o:p></o:p></li>
<li class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l2
level1 lfo1">
Keep your windows installation as clean as possible. QGIS
might conflict with some other software installed on your
computer. You might try to install QGIS on computer with a
new clean install of windows. Check if the error is
repeated on the new computer.
<o:p></o:p></li>
<li class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l2
level1 lfo1">
You might try with installing QGIS from the "network
installer" utility instead of a stand-alone installation (<a
href="https://download.osgeo.org/osgeo4w/osgeo4w-setup-x86_64.exe"
moz-do-not-send="true">https://download.osgeo.org/osgeo4w/osgeo4w-setup-x86_64.exe</a>).
It defaults to another installation directory than the
stand-alone installation. That might help.<o:p></o:p></li>
<li class="MsoNormal"
style="mso-margin-top-alt:auto;margin-bottom:12.0pt;mso-list:l2
level1 lfo1">
If nothing of the above works - try another version of
QGIS i.e. 3.12.1. <br>
The network installer has the possibility to install a
"bleeding edge" version of QGIS but I won't recommend
using these in a teaching situation (or any other
situation which involves inexperienced users). But you can
use it in a testing situation
<o:p></o:p></li>
</ul>
<pre>-- <o:p></o:p></pre>
<pre>Med venlig hilsen / Kind regards<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>Bo Victor Thomsen<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<p> <o:p></o:p></p>
<div>
<p class="MsoNormal">Den 09-04-2020 kl. 11:20 skrev Koos
Fransen:<o:p></o:p></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoNormal">Hi Bo<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">Thanks for your
quick response!</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">Sorry for the
minimal information provided, I wasn’t sure what to add
(first question to the QGIS user list).</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">To answer your
questions:</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">OS: Windows 10 – 64
bit</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">QGIS version: 3.10.4
64 bit, stand-alone installation</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">I’m not in any
networked set-up, I’m working from home on my own
computer. I have only one plugin installed (QuickOSM),
and I’ve already tried uninstalling, but without any
difference.</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">Since my question
I’ve been trying some things, and I have deleted the
temporary QGIS files in my Local/Temp folder. When I
open and use QGIS now, I have the feeling it’s more
stable again. It gives a hint of freezing up at the
start, but afterwards all goes quite well again. Then
again, not sure of this is a solid solution for fixing
this issue, as I have experienced this issue before
completely deleting and reinstalling everything
QGIS-related on my laptop (using REVO uninstaller).
After this, QGIS worked fine for about a week until
today.</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">I do recall trying
to load some large files into QGIS, maybe they were
stored in a temporary directory somewhere and deleting
the temporary files helped?</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">Anyways, it might be
relevant for me to know. I’ve switched our courses from
ArcGIS to QGIS, and I’m really happy about it, but I
would like to be able to help my students if these kind
of problems occur.</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">Thank for the help
already, not sure if there’s more to do for now, but let
me know if you have any more ideas.</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">Kind regards</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">Koos</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<div>
<p class="MsoNormal" style="background:white"><span
style="font-size:8.0pt;color:black" lang="EN-GB">-- <br>
<b><span style="background:white">dr. Koos Fransen</span></b></span><o:p></o:p></p>
<p class="MsoNormal" style="background:white"><span
style="font-size:8.0pt;color:black" lang="EN-GB">Research
unit Cosmopolis (VUB)</span><o:p></o:p></p>
<p class="MsoNormal" style="background:white"><span
style="font-size:8.0pt;color:black" lang="EN-GB">Research
unit ISE (UGent)</span><o:p></o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:NL"
lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal" style="background:white"><span
style="font-size:8.0pt;color:black" lang="EN-GB">I am
available for
<u>VUB</u> on <u>Tuesdays, Thursdays and Fridays</u>
and for UGent on Mondays and Wednesdays. Consequently,
I try to structure meetings accordingly and answers to
your mails may be delayed.</span><o:p></o:p></p>
</div>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<div>
<div style="border:none;border-top:solid #E1E1E1
1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span
style="mso-fareast-language:NL" lang="EN-US">From:</span></b><span
style="mso-fareast-language:NL" lang="EN-US">
Qgis-user
<a href="mailto:qgis-user-bounces@lists.osgeo.org"
moz-do-not-send="true"><qgis-user-bounces@lists.osgeo.org></a>
<b>On Behalf Of </b>Bo Victor Thomsen<br>
<b>Sent:</b> donderdag 9 april 2020 10:16<br>
<b>To:</b> <a
href="mailto:qgis-user@lists.osgeo.org"
moz-do-not-send="true">qgis-user@lists.osgeo.org</a><br>
<b>Subject:</b> Re: [Qgis-user] ISSUE QGIS keeps
freezing - QGIS Desktop 3.10.4</span><o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"> <o:p></o:p></p>
<p>Hi Koos: <o:p></o:p></p>
<p>That's not much information to go on. <o:p></o:p></p>
<p>What about: OS type and version ? 32/64 bit os ? QGIS
version ? QGIS 32/64 bit ? network environment ? Normal
stand-alone installation or Network installation ?<o:p></o:p></p>
<p>I'll hazard a <b>guess</b> based on my own painful
experiences: You are working in a networked windows
setup, where your IT department has made some
modifications for home directory (including temp file
placement) and/or the userdata environment - maybe making
it fully dependant on the network. And maybe You are using
the same login account for all pupils. Combine this with a
marginally functioning network and it will be a train
wreck<o:p></o:p></p>
<p>Another scenario: You have installed some plugin, that's
not working correctly.<o:p></o:p></p>
<p>What you can test: <o:p></o:p></p>
<ul type="disc">
<li class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1
level1 lfo4">
Disable/Remove all plugins from QGIS and test if the
problem goes away <o:p></o:p></li>
<li class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1
level1 lfo4">
Load some GIS data locally on you computer and
disconnect the computer from the network. Then test QGIS
again.<o:p></o:p></li>
</ul>
<p>That said, QGIS ver. 3.10 onwards has long startup times.
However it's quick and stable after that<o:p></o:p></p>
<p class="MsoNormal">-- <o:p></o:p></p>
<pre>Med venlig hilsen / Kind regards<o:p></o:p></pre>
<pre> <o:p></o:p></pre>
<pre>Bo Victor Thomsen<o:p></o:p></pre>
<p>Den 09-04-2020 kl. 09:46 skrev Koos Fransen:<o:p></o:p></p>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoNormal"><span lang="EN-US">Dear all</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">I have a question
regarding QGIS.</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">I’m using QGIS for
my classes, but since a recent install my QGIS keeps
freezing right after startup. It doesn’t respond until
after a minute, then I can open some files and then it
freezes again. This keeps on going, making it
impossible to keep working with QGIS.</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">I’ve tried
reinstalling, which always helps at first, but after a
couple of days it starts freezing again. I’ve also
tried with different versions, with the same result.</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">It might maybe
have something to do with temporary files?</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">Has someone
experienced the same issue, and are there possible
solutions that you know of?</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">Thanks!</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">Koos</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:NL"><br>
<br>
<br>
</span><o:p></o:p></p>
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</blockquote>
<pre> <o:p></o:p></pre>
</blockquote>
<p class="MsoNormal"><span style="mso-fareast-language:NL"><br>
<br>
<o:p></o:p></span></p>
<pre>_______________________________________________<o:p></o:p></pre>
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</blockquote>
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</blockquote>
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