<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div>I did a number of tests to compare the performance of the various IPOPT Matlab MEX file builds I did on Mac OS X, and some of the results surprised me. My test problems were 4 different optimal power flow problems for electricity grids, ranging in size from ~700 vars and ~1400 constraints to ~50,000 vars and ~110,000 constraints. Here is what I found.</div><div><br></div><div><div>1. NETLIB BLAS/LAPACK was on average about 30% slower than the optimized version in the Accelerate/vecLib framework. The difference was much greater (about 100%) on the larger models.</div></div><div><br></div><div>2. MUMPS is noticeably faster (over 50% in some cases) than MA57 on the larger models, and vice versa for the smaller models. On average they were about the same.</div><div><br></div><div>The second result baffles me. I thought MA57 was expected to be significantly better than MUMPS. Am I missing something? Anybody have any ideas?</div><div><br></div><div>Info on exactly how I'm building MA57 is here: <a href="http://list.coin-or.org/pipermail/ipopt/2011-October/002623.html">http://list.coin-or.org/pipermail/ipopt/2011-October/002623.html</a></div><div><br></div><div><span class="Apple-style-span" style="font-size: 12px; ">-- </span></div><div><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: medium; 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; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; 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; -webkit-text-decorations-in-effect: none; text-indent: 0px; -webkit-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 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; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; 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; -webkit-text-decorations-in-effect: none; text-indent: 0px; -webkit-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><div>Ray Zimmerman</div><div>Senior Research Associate</div><div>419A Warren Hall, Cornell University, Ithaca, NY 14853</div><div>phone: (607) 255-9645</div><br class="Apple-interchange-newline"></span></div></span></div></span><br class="Apple-interchange-newline"></span><br class="Apple-interchange-newline">
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