<HTML><BODY style="word-wrap: break-word; -khtml-nbsp-mode: space; -khtml-line-break: after-white-space; "><FONT class="Apple-style-span" color="#000000">Hi!</FONT><DIV><FONT class="Apple-style-span" color="#000000"><BR class="khtml-block-placeholder"></FONT></DIV><DIV><FONT class="Apple-style-span" color="#000000">I just compiled Cbc on an Intel Xeon running Debian Linux as well as on an Apple PPC G5 running OSX:<BR></FONT></DIV><DIV><FONT class="Apple-style-span" color="#000000"><BR class="khtml-block-placeholder"></FONT></DIV><DIV><FONT class="Apple-style-span" color="#000000"><FONT class="Apple-style-span" face="Courier">Coin Cbc and Clp Solver version 1.01.00, build Jul 3 2006</FONT></FONT></DIV><DIV><FONT class="Apple-style-span" color="#000000"><BR class="khtml-block-placeholder"></FONT></DIV><DIV><FONT class="Apple-style-span" color="#000000">The Intel runs at 3 GHz and the PPC at 2 GHz. I compared the performance of both machines on the problem </FONT><FONT class="Apple-style-span" color="#000000"><FONT class="Apple-style-span" face="Courier">nw04</FONT></FONT><FONT class="Apple-style-span" color="#000000"> from the miplib (</FONT><FONT class="Apple-style-span" color="#000000"><A href="http://miplib.zib.de">http://miplib.zib.de</A>/) </FONT></DIV><DIV><SPAN class="Apple-style-span" style="text-decoration: underline;"><BR class="khtml-block-placeholder"></SPAN></DIV><DIV>The PPC comes to this result:</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV><FONT class="Apple-style-span" color="#000000"><FONT class="Apple-style-span" face="Courier">Result - Finished objective 16862 after 0 nodes and 861 iterations - took 102.11 seconds</FONT></FONT></DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>and the Intel to this one:</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV><FONT class="Apple-style-span" face="Courier">Result - Finished objective 16862 after 484 nodes and 4600 iterations - took 73.22 seconds</FONT></DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>Why does the identical solver use different numbers of nodes and iterations on the identical problem but on different architectures?</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>Regards,</DIV><DIV>Martin</DIV></BODY></HTML>