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    <p>Matt,</p>
    <p>I cut all the unnecessary packages and still have the same issue.</p>
    <p>I also checked 'size mitgcmuv' and compared the size to other
      runs which work - it asks for about half the size of other runs
      which work fine (same machine, same queue, same compiling options,
      etc).</p>
    <p>The tiles are already down to 32x32 grid points, and I'm happily
      running configurations with a tile size almost twice as big and
      the same amount of vertical layers.</p>
    <p>I will try some different tile sizes but I think the problem must
      be somewhere else..</p>
    <p>Andreas<br>
    </p>
    <p><br>
    </p>
    <p><br>
    </p>
    <br>
    <div class="moz-cite-prefix">On 18/05/18 00:35, Matthew Mazloff
      wrote:<br>
    </div>
    <blockquote type="cite"
      cite="mid:83E5C755-65B9-4486-95DE-463073267C4A@ucsd.edu">
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      Sounds like a memory issue. I think your executable has become too
      big for you machine. You will need to reduce tile size or do
      something else (e.g. reduce number of diagnostics or cut a
      package)
      <div class=""><br class="">
      </div>
      <div class="">and check</div>
      <div class="">
        <div style="margin: 0px; font-stretch: normal; font-size: 16px;
          line-height: normal; font-family: Menlo; background-color:
          rgb(254, 244, 156);" class=""><span
            style="font-variant-ligatures: no-common-ligatures" class="">size
            mitgcmuv </span></div>
      </div>
      <div class="">to get a ballpark idea of how much memory you are
        requesting</div>
      <div class=""><br class="">
      </div>
      <div class="">Matt</div>
      <div class=""><br class="">
      </div>
      <div class=""><br class="">
        <div><br class="">
          <blockquote type="cite" class="">
            <div class="">On May 16, 2018, at 11:27 PM, Andreas Klocker
              <<a href="mailto:andreas.klocker@utas.edu.au" class=""
                moz-do-not-send="true">andreas.klocker@utas.edu.au</a>>
              wrote:</div>
            <br class="Apple-interchange-newline">
            <div class="">
              <div class="">Hi guys,<br class="">
                <br class="">
                I've taken a working 1/24 degree nested simulation (of
                Drake Passage)<br class="">
                with 42 vertical layers and tried to increase the
                vertical layers to 150<br class="">
                (without changing anything else apart from obviously my
                boundary files<br class="">
                for OBCS and recompiling with 150 vertical layers).
                Suddenly I get the<br class="">
                following error message:<br class="">
                <br class="">
                forrtl: severe (174): SIGSEGV, segmentation fault
                occurred<br class="">
                Image              PC                Routine Line
                       Source<br class="">
                <a moz-do-not-send="true" href="http://libirc.so">libirc.so</a>
                         00002BA1704BC2C9  Unknown Unknown  Unknown<br
                  class="">
                <a moz-do-not-send="true" href="http://libirc.so">libirc.so</a>
                         00002BA1704BAB9E  Unknown Unknown  Unknown<br
                  class="">
                libifcore.so.5     00002BA1722B5F3F  Unknown Unknown
                 Unknown<br class="">
                libifcore.so.5     00002BA17221DD7F  Unknown Unknown
                 Unknown<br class="">
                libifcore.so.5     00002BA17222EF43  Unknown Unknown
                 Unknown<br class="">
                libpthread.so.0    00002BA1733B27E0  Unknown Unknown
                 Unknown<br class="">
                mitgcmuv_drake24_  00000000004E61BC  mom_calc_visc_ 3345
                 mom_calc_visc.f<br class="">
                mitgcmuv_drake24_  0000000000415127  mom_vecinv_ 3453
                 mom_vecinv.f<br class="">
                mitgcmuv_drake24_  0000000000601C33  dynamics_ 3426
                 dynamics.f<br class="">
                mitgcmuv_drake24_  0000000000613C2B  forward_step_ 2229
                 forward_step.f<br class="">
                mitgcmuv_drake24_  000000000064581E  main_do_loop_ 1886
                 main_do_loop.f<br class="">
                mitgcmuv_drake24_  000000000065E500  the_main_loop_ 1904
                 the_main_loop.f<br class="">
                mitgcmuv_drake24_  000000000065E6AE  the_model_main_
                2394  the_model_main.f<br class="">
                mitgcmuv_drake24_  00000000005C6439  MAIN__ 3870  main.f<br
                  class="">
                mitgcmuv_drake24_  0000000000406776  Unknown Unknown
                 Unknown<br class="">
                libc.so.6          00002BA1737E2D1D  Unknown Unknown
                 Unknown<br class="">
                mitgcmuv_drake24_  0000000000406669  Unknown Unknown
                 Unknown<br class="">
                <br class="">
                First this error pointed to a line in mom_calc_visc.f on
                which<br class="">
                calculations regarding the Leith viscosity are done. As
                a test I then<br class="">
                used a Smagorinsky viscosity instead and now it crashes
                with the same<br class="">
                error, but pointing to a line where Smagorinsky
                calculations are done. I<br class="">
                assume I must be chasing a way more fundamental problem
                than one related<br class="">
                to these two viscosity choices...but I'm not sure what
                this might be....<br class="">
                <br class="">
                Has anyone got any idea of what could be going wrong
                here?<br class="">
                <br class="">
                Thanks in advance!<br class="">
                <br class="">
                Andreas<br class="">
                <br class="">
                <br class="">
                <br class="">
                University of Tasmania Electronic Communications Policy
                (December, 2014).<br class="">
                This email is confidential, and is for the intended
                recipient only. Access, disclosure, copying,
                distribution, or reliance on any of it by anyone outside
                the intended recipient organisation is prohibited and
                may be a criminal offence. Please delete if obtained in
                error and email confirmation to the sender. The views
                expressed in this email are not necessarily the views of
                the University of Tasmania, unless clearly intended
                otherwise.<br class="">
                <br class="">
                _______________________________________________<br
                  class="">
                MITgcm-support mailing list<br class="">
                <a href="mailto:MITgcm-support@mitgcm.org" class=""
                  moz-do-not-send="true">MITgcm-support@mitgcm.org</a><br
                  class="">
                <a moz-do-not-send="true" href="http://mailman.mitgcm.org/mailman/listinfo/mitgcm-support">http://mailman.mitgcm.org/mailman/listinfo/mitgcm-support</a><br
                  class="">
              </div>
            </div>
          </blockquote>
        </div>
        <br class="">
      </div>
      <br>
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      <br>
      <pre wrap="">_______________________________________________
MITgcm-support mailing list
<a class="moz-txt-link-abbreviated" href="mailto:MITgcm-support@mitgcm.org">MITgcm-support@mitgcm.org</a>
<a href="http://mailman.mitgcm.org/mailman/listinfo/mitgcm-support" class="moz-txt-link-freetext">http://mailman.mitgcm.org/mailman/listinfo/mitgcm-support</a>
</pre>
    </blockquote>
    <br>
    <pre class="moz-signature" cols="72">-- 
===============================================================
Dr. Andreas Klocker
Physical Oceanographer

ARC Centre of Excellence for Climate System Science
&
Institute for Marine and Antarctic Studies
University of Tasmania
20 Castray Esplanade
Battery Point, TAS
7004 Australia

M:     +61 437 870 182
W:     <a class="moz-txt-link-freetext" href="http://www.utas.edu.au/profiles/staff/imas/andreas-klocker">http://www.utas.edu.au/profiles/staff/imas/andreas-klocker</a>
skype: andiklocker
===============================================================</pre>
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