Fwd: ET and recent Intel compilers - Users

28 Oct 2021

      Just trying to keep this on the users list.
--Steve
-------- Forwarded Message --------
Subject: 	Re: [Users] ET and recent Intel compilers
Date: 	Mon, 25 Oct 2021 09:00:26 +0900
From: 	Hee Il Kim heeilkim@gmail.com
To: 	Steven R. Brandt sbrandt@cct.lsu.edu
Hi Steve,
I'm using that 'fp-precise' option. The bns specific thorns like 
NSTracker and RotatingSymmetry180 didn't make the issue (and RK3 instead 
of RK4 is tested).
I think I might be mistaken but I've thought that TOV and BNS use 
different initial data setup, for instance, to get the values for _p, 
_p_p etc. I was suspecting that BNS might be causing the trouble while 
making those data. But I've got messy confirming what I have thought. Do 
you have any feeling it's likely caused by this process? Since the TOV 
test didn't encounter the issue, I think there's no more bns-specific 
processes.
Thanks in advance.
Hee Il
On Thu, Oct 21, 2021 at 10:45 PM Steven R. Brandt sbrandt@cct.lsu.edu 
wrote:
Sorry I lost track of this email thread. I got caught up with other
    things. I'm wondering whether you have tried compiling with
    fp-precise? I'm just wondering whether it could be a problem with
    Intel's optimization.
--Steve
On 9/1/2021 6:21 AM, Hee Il Kim wrote:
...
Hi,

As James Healy mentioned in the post "[Users] Einstein Toolkit and
modern AMD supercomputer", I found static_tov.par passed the test
for the Intel issue. So some bns-generic codes would make NaNs.
But less probable because the only bns-generic code would be
NSTracker but I've already encountered the NaN production issue
w/wo NSTracker.

NaNChecker itself could be suspected but both bns and tove tests
are using NaNChecker.

Rather, it could be a generic issue of Intel compiler. There are
some bugs reported and new features in handling NaNs for the case
of ifx. Those look just irrelevant yet.

Hee Il

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