<html><head><meta http-equiv="Content-Type" content="text/html charset=windows-1252"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><br><div><div>On 14 Nov 2013, at 03:56, Frank Löffler <<a href="mailto:knarf@cct.lsu.edu">knarf@cct.lsu.edu</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">On Thu, Nov 14, 2013 at 12:55:57AM +0100, Ian Hinder wrote:<br><blockquote type="cite">This is likely due to the Exact thorn. It also fails on Stampede. I<br>have added an EinsteinExact version of this test, and this passes on<br>my laptop, on datura, and on stampede. I propose we remove the Exact<br>version of this test, since the tested functionality is available in<br>EinsteinExact, and Exact is anything but…<br></blockquote><br>I agree, we should remove these testsuites after the release.<br></blockquote><div><br></div><div>Why not before the release? It is distracting to have certain tests which fail on some machines; since we know the reason for the failures, and there are other tests which test equivalent functionality, I think we should simplify the testing process and eliminate the Exact tests which are failing for which we have EinsteinExact versions.</div><div><br></div><blockquote type="cite"><blockquote type="cite">Is your workstation optionlist in simfactory? What optimisation settings are you using?<br></blockquote><br>Yes. It's debian.cfg and debian-intel.cfg.<br><br><blockquote type="cite"><span class="Apple-tab-span" style="white-space:pre"> </span>-Ofast<br><span class="Apple-tab-span" style="white-space:pre"> </span>-O3<br></blockquote><br>This uses -O2 without very special options. However, it uses -xHost (to<br>be general and somewhat fast). According to the man-page this defaults<br>to -no-prec-div on some systems. Maybe we should add -proc-div to this<br>option list.<br><br>Quote:<br><br>With some optimizations, such as -msse2 (Linux* OS) or /arch:SSE2<br>(Windows* OS), the compiler may change floating-point division<br>computations into multiplication by the reciprocal of the denominator.<br>For example, A/B is computed as A * (1/B) to improve the speed of the<br>computation.<br></blockquote><div><br></div><div>I found this section of the manual page very confusing, but in the end interpreted it differently; i.e. that this would happen with -no-prec-div but not with -prec-div. -prec-div is the default, and it would be very odd for the compiler to make these changes when -prec-div was set. Can you try running one of the tests with -prec-div and with -no-prec-div to check which is being used? There should also be a compiler option to output the effective flags that are being used.</div><div><br></div><div>I think -xHost should be fine, and is probably the best way to choose the CPU-specific optimisations; I don't think it changes the numerical results (but compilers can always surprise us!).</div><div><br></div></div><div apple-content-edited="true">
<span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div>-- </div><div>Ian Hinder</div><div><a href="http://numrel.aei.mpg.de/people/hinder">http://numrel.aei.mpg.de/people/hinder</a></div></div></span></div></span></div></span></span>
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