<div dir="ltr"><div dir="ltr"><div class="gmail_default" style="font-family:tahoma,sans-serif"><br></div></div><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, 3 Apr 2023 at 14:04, Tomaž Vajngerl <<a href="mailto:tomaz.vajngerl@collabora.co.uk">tomaz.vajngerl@collabora.co.uk</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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<p>One of the issues with letting the OS deal with all that is that
the OS has no idea what and when it can swap out - it just uses
LRU when there is a memory pressure, or not. We can do it much
more effectively and do less work, for example not keep it in the
</p></div></blockquote><div><div class="gmail_default" style="font-family:tahoma,sans-serif">I think we're going to have to agree to disagree here. </div><div class="gmail_default" style="font-family:tahoma,sans-serif"><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif">I think our current code is doing the best that it can, but it fundamentally cannot make as good a decision as the OS because it does not have the same global view of the machine.</div><div class="gmail_default" style="font-family:tahoma,sans-serif"><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif">For example, in performance profiles, I regularly see my very powerful Windows machine with tons of RAM running like a Pentium because LibreOffice is spending all its time unnecessarily pushing things into temp files [0].</div></div><div class="gmail_default" style="font-family:tahoma,sans-serif"><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif">Presumably, people who work primarily on Linux never see these issues because /tmp on Linux acts like a RAM drive on fast machines with lots of memory.</div><div class="gmail_default" style="font-family:tahoma,sans-serif"><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif">So I would personally prefer that we just let the LRU algorithm of the OS swap logic do its thing.</div><div class="gmail_default" style="font-family:tahoma,sans-serif"><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif">Regards, Noel.</div><div class="gmail_default" style="font-family:tahoma,sans-serif"><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif">[0] This was the primary motivation behind the utl::TempFileFast work, which helped some cases, but in other places, Libreoffice still insists on having a named temporary file (mostly because of the UCB layer).</div><div class="gmail_default" style="font-family:tahoma,sans-serif"><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif"><br></div></div></div>