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<p>Hi,</p>
<p><br>
</p>
<p>I can with <span>one caveat</span>: I am using a modified version of FLASH4. I suspect the error is coming from part of the code that</p>
<p>has not been modified, but I am not 100% certain at this point in time.</p>
<p><br>
</p>
<p>I am using the Intel compilers on the machine where it works and cray (also tested gnu) on the machine where the code crashes.</p>
<p>After talking to a <span>colleague</span>, I have learned that the code compiled with Intel compilers runs on the
<span>AMD EPYC 7763 CPUs.<br>
However, the Intel compilers are not available on the machine I am using.<br>
<br>
Boundary conditions are "reflect" at the inner-boundary and "user" at the outer boundary
<br>
(the user condition essentially specifies an outflow/inflow with some modifications for density/gpot/radiation...
<br>
</span></p>
<p><span><a target="_blank" class="c-link" data-stringify-link="https://github.com/snaphu-msu/BANG/blob/master/source/Simulation/SimulationMain/CoreCollapse/Grid_bcApplyToRegionSpecialized.F90" data-sk="tooltip_parent" href="https://github.com/snaphu-msu/BANG/blob/master/source/Simulation/SimulationMain/CoreCollapse/Grid_bcApplyToRegionSpecialized.F90" rel="noopener noreferrer">/Simulation/SimulationMain/CoreCollapse/Grid_bcApplyToRegionSpecialized.F90</a>
if it exists in the standard FLASH version).</span></p>
<p><span><br>
</span></p>
<p><span>I have traced the issue back to negative density values in some guard cells near an refinement boundary, but far away from the outer grid boundary and</span></p>
<p><span>not close to the inner grid boundary. <br>
<br>
As for error messages, it is <br>
"<span>Error message is [EOS] rho < rhomin</span>" <br>
when using Cray and <br>
<br>
"</p>
<div> Newton-Raphson failed in subroutine eos_helmholtz<br>
(e and rho as input):<br>
<br>
too many iterations 50<br>
<br>
temp = NaN<br>
dens = -2.2471185595023190E+307<br>
pres = NaN<br>
<br>
</div>
"<br>
when using GNU. I am not sure these are informative for you since they could be specific to our version of</span>
<p></p>
<p><span>FLASH. The root cause is the negative densities that somehow appear in the guard-cell fill.</span></p>
<p><span><br>
</span></p>
<p><span>Thanks for your help.</span></p>
<p><span><br>
</span></p>
<p><span>Best,<br>
Haakon<br>
</span></p>
</div>
<hr style="display:inline-block;width:98%" tabindex="-1">
<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Reyes, Adam <adam.reyes@rochester.edu><br>
<b>Sent:</b> 30 April 2024 10:04:20<br>
<b>To:</b> Haakon Andresen<br>
<b>Cc:</b> flash-users@flash.rochester.edu<br>
<b>Subject:</b> Re: [FLASH-USERS] Code crash when moving to an AMD based machine</font>
<div> </div>
</div>
<div>Hi Haakon,
<div><br>
</div>
<div>Could you share a bit more context about what you’re observing, maybe the exact error from FLASH and the boundary conditions that you’re using? Are you using the same compiler between the two machines?<br id="lineBreakAtBeginningOfMessage">
<div>
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*********************************************<br>
Adam Reyes</div>
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<span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; display: inline !important; float: none;"> </span><span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; display: inline !important; float: none;">(he
/ him / his)</span><br style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;">
<span><img alt="FLASH-pride-sml.png" src="cid:CE45460D-2261-4A69-865C-5CF7BEACF620"></span>
<div style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;">
<br>
*********************************************</div>
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<blockquote type="cite">
<div>On Apr 29, 2024, at 4:02 PM, Haakon Andresen <haakon.andresen@astro.su.se> wrote:</div>
<br class="Apple-interchange-newline">
<div>
<div id="divtagdefaultwrapper" dir="ltr" style="font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-size: 12pt; font-family: Calibri, Helvetica, sans-serif;">
<div style="margin-top: 0px; margin-bottom: 0px;">Dear Flash users,</div>
<div style="margin-top: 0px; margin-bottom: 0px;"><br>
I am currently testing FLASH on a machine with AMD CPUs, specifically<span class="Apple-converted-space"> </span><span>AMD EPYC 7763</span>. Previously, I have only used the code on Intel based architecture. I have encountered a bug, which I believe is related
to guard-cell fills, but I have not found the root cause yet.<span class="Apple-converted-space"> </span><br>
</div>
<div style="margin-top: 0px; margin-bottom: 0px;"><br>
</div>
<div style="margin-top: 0px; margin-bottom: 0px;">I am doing core-collapse simulations with paramesh, the code initializes and writes the first checkpoint file, but then crashes in hydro-solver. The crash occurs during a call to the subroutine that is responsible
for filling guard cells. My debugging has lead me all the way into the paramesh routines. The error, guard cells being filled with bad values, happens at a refinement boundary. The test is done in 1D.</div>
<div style="margin-top: 0px; margin-bottom: 0px;"><br>
</div>
<div style="margin-top: 0px; margin-bottom: 0px;">The puzzling part is that the code, with the exact same setup, runs just fine on a different machine (an intel machine). I am wondering if anyone have seen similar behavior in the past. I am not sure that the
root cause is in paramesh, but if anyone have experience anything similar I would love to hear about it, maybe it will help me identify the issue. </div>
<div style="margin-top: 0px; margin-bottom: 0px;"><br>
</div>
<div style="margin-top: 0px; margin-bottom: 0px;">Best,<br>
Haakon Andresen<br>
</div>
</div>
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<a href="https://flash.rochester.edu/mailman/listinfo/flash-users" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;">https://flash.rochester.edu/mailman/listinfo/flash-users</a></div>
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