<HTML><BODY style="word-wrap: break-word; -khtml-nbsp-mode: space; -khtml-line-break: after-white-space; "><BR><DIV><DIV>On Mar 3, 2006, at 12:00 PM, <A href="mailto:beowulf-request@beowulf.org">beowulf-request@beowulf.org</A> wrote:</DIV><BR class="Apple-interchange-newline"><BLOCKQUOTE type="cite"><P style="margin: 0.0px 0.0px 0.0px 0.0px; font: 13.0px Lucida Grande; min-height: 16.0px"><BR></P> <BLOCKQUOTE type="cite"><P style="margin: 0.0px 0.0px 0.0px 10.0px"><FONT face="Lucida Grande" size="4" style="font: 13.0px Lucida Grande">Note also that I'm guessing that these boxes draw somewhere between 200</FONT></P> <P style="margin: 0.0px 0.0px 0.0px 10.0px"><FONT face="Lucida Grande" size="4" style="font: 13.0px Lucida Grande">and 300 watts fully loaded with tasks (anybody out there measure?</FONT></P> </BLOCKQUOTE><P style="margin: 0.0px 0.0px 0.0px 0.0px; font: 13.0px Lucida Grande; min-height: 16.0px"><BR></P> <P style="margin: 0.0px 0.0px 0.0px 0.0px"><FONT face="Lucida Grande" size="4" style="font: 13.0px Lucida Grande">I recently did some measurements on new nodes: HP DL145G2's with 8GB ram,</FONT></P> <P style="margin: 0.0px 0.0px 0.0px 0.0px"><FONT face="Lucida Grande" size="4" style="font: 13.0px Lucida Grande">2x80G disks, quadrics elan4 cards:</FONT></P> <P style="margin: 0.0px 0.0px 0.0px 0.0px; font: 13.0px Lucida Grande; min-height: 16.0px"><BR></P> <P style="margin: 0.0px 0.0px 0.0px 0.0px"><FONT face="Lucida Grande" size="4" style="font: 13.0px Lucida Grande"><SPAN class="Apple-tab-span" style="white-space:pre"> </SPAN><SPAN class="Apple-tab-span" style="white-space:pre"> </SPAN>2x DC opt/2.2<SPAN class="Apple-tab-span" style="white-space:pre"> </SPAN>2x SC opt/2.6</FONT></P> <P style="margin: 0.0px 0.0px 0.0px 0.0px"><FONT face="Lucida Grande" size="4" style="font: 13.0px Lucida Grande">booting <SPAN class="Apple-converted-space"> </SPAN>259-317<SPAN class="Apple-tab-span" style="white-space:pre"> </SPAN><SPAN class="Apple-tab-span" style="white-space:pre"> </SPAN>244-313</FONT></P> <P style="margin: 0.0px 0.0px 0.0px 0.0px"><FONT face="Lucida Grande" size="4" style="font: 13.0px Lucida Grande">idle<SPAN class="Apple-converted-space"> </SPAN>265<SPAN class="Apple-tab-span" style="white-space:pre"> </SPAN><SPAN class="Apple-tab-span" style="white-space:pre"> </SPAN>255</FONT></P> <P style="margin: 0.0px 0.0px 0.0px 0.0px"><FONT face="Lucida Grande" size="4" style="font: 13.0px Lucida Grande">1p thrash -g6<SPAN class="Apple-tab-span" style="white-space:pre"> </SPAN>286<SPAN class="Apple-tab-span" style="white-space:pre"> </SPAN><SPAN class="Apple-tab-span" style="white-space:pre"> </SPAN>275</FONT></P> <P style="margin: 0.0px 0.0px 0.0px 0.0px"><FONT face="Lucida Grande" size="4" style="font: 13.0px Lucida Grande">1p stream<SPAN class="Apple-tab-span" style="white-space:pre"> </SPAN>291<SPAN class="Apple-tab-span" style="white-space:pre"> </SPAN><SPAN class="Apple-tab-span" style="white-space:pre"> </SPAN>284</FONT></P> <P style="margin: 0.0px 0.0px 0.0px 0.0px"><FONT face="Lucida Grande" size="4" style="font: 13.0px Lucida Grande">2p<SPAN class="Apple-tab-span" style="white-space:pre"> </SPAN><SPAN class="Apple-tab-span" style="white-space:pre"> </SPAN>290-301<SPAN class="Apple-tab-span" style="white-space:pre"> </SPAN><SPAN class="Apple-tab-span" style="white-space:pre"> </SPAN>310</FONT></P> <P style="margin: 0.0px 0.0px 0.0px 0.0px"><FONT face="Lucida Grande" size="4" style="font: 13.0px Lucida Grande">4p<SPAN class="Apple-tab-span" style="white-space:pre"> </SPAN><SPAN class="Apple-tab-span" style="white-space:pre"> </SPAN>290-338</FONT></P> <P style="margin: 0.0px 0.0px 0.0px 0.0px; font: 13.0px Lucida Grande; min-height: 16.0px"><BR></P> <P style="margin: 0.0px 0.0px 0.0px 0.0px"><FONT face="Lucida Grande" size="4" style="font: 13.0px Lucida Grande">"idle" means nothing explicitly running (though the distro includes a<SPAN class="Apple-converted-space"> </SPAN></FONT></P> <P style="margin: 0.0px 0.0px 0.0px 0.0px"><FONT face="Lucida Grande" size="4" style="font: 13.0px Lucida Grande">surprising number of irrelevant daemons.)<SPAN class="Apple-converted-space"> </SPAN>"thrash -g 6" is a program that</FONT></P> <P style="margin: 0.0px 0.0px 0.0px 0.0px"><FONT face="Lucida Grande" size="4" style="font: 13.0px Lucida Grande">allocates 6GB and just repeatedly memset's it.<SPAN class="Apple-converted-space"> </SPAN>it's single-threaded,</FONT></P> <P style="margin: 0.0px 0.0px 0.0px 0.0px"><FONT face="Lucida Grande" size="4" style="font: 13.0px Lucida Grande">but since 6GB is large enough to require both CPU's banks of memory, the</FONT></P> <P style="margin: 0.0px 0.0px 0.0px 0.0px"><FONT face="Lucida Grande" size="4" style="font: 13.0px Lucida Grande">other cpu is not inactive.<SPAN class="Apple-converted-space"> </SPAN>1/2/3 are an openmp version of stream, run<SPAN class="Apple-converted-space"> </SPAN></FONT></P> <P style="margin: 0.0px 0.0px 0.0px 0.0px"><FONT face="Lucida Grande" size="4" style="font: 13.0px Lucida Grande">with "numactl -l".</FONT></P> </BLOCKQUOTE></DIV><BR><DIV> <P style="margin: 0.0px 0.0px 0.0px 0.0px; font: 13.0px Lucida Grande"><BR class="khtml-block-placeholder"></P><P style="margin: 0.0px 0.0px 0.0px 0.0px; font: 13.0px Lucida Grande">Trying to micromanage these power loads can be counter productive and time wasting. Better: just take your worst case estimate of power usage, double it or even quadruple it ... and that is what you should plan to "wire into the walls".</P><P style="margin: 0.0px 0.0px 0.0px 0.0px; font: 13.0px Lucida Grande"><BR class="khtml-block-placeholder"></P><P style="margin: 0.0px 0.0px 0.0px 0.0px; font: 13.0px Lucida Grande">Example: four slave processors at 300 watts each plus a master server / control workstation at 450 watts (worst case) ... And associated monitors, printer(s), accessories =</P><P style="margin: 0.0px 0.0px 0.0px 0.0px; font: 13.0px Lucida Grande">CPUs</P><P style="margin: 0.0px 0.0px 0.0px 0.0px; font: 13.0px Lucida Grande">300 x 4 = 1200 watts</P><P style="margin: 0.0px 0.0px 0.0px 0.0px; font: 13.0px Lucida Grande">+ 450 watts</P><P style="margin: 0.0px 0.0px 0.0px 0.0px; font: 13.0px Lucida Grande">------------------</P><P style="margin: 0.0px 0.0px 0.0px 0.0px; font: 13.0px Lucida Grande">Monitors</P><P style="margin: 0.0px 0.0px 0.0px 0.0px; font: 13.0px Lucida Grande">100 x 5 = 500 watts</P><P style="margin: 0.0px 0.0px 0.0px 0.0px; font: 13.0px Lucida Grande">accessories</P><P style="margin: 0.0px 0.0px 0.0px 0.0px; font: 13.0px Lucida Grande"> 100 x 5 = 500 watts</P><P style="margin: 0.0px 0.0px 0.0px 0.0px; font: 13.0px Lucida Grande">-----------------</P><P style="margin: 0.0px 0.0px 0.0px 0.0px; font: 13.0px Lucida Grande"><BR class="khtml-block-placeholder"></P><P style="margin: 0.0px 0.0px 0.0px 0.0px; font: 13.0px Lucida Grande">... looks like about 3000 watts to me ... so wire four power runs of 2000 watts each from your subpanel (#12 AWG with ground on four 20 amp breakers) to the computer room (works up to 150 feet). Use quad utility boxes on the remote ends and add filtered surge protectors to suit ...</P><P style="margin: 0.0px 0.0px 0.0px 0.0px; font: 13.0px Lucida Grande"><BR class="khtml-block-placeholder"></P><P style="margin: 0.0px 0.0px 0.0px 0.0px; font: 13.0px Lucida Grande">Ed Karns</P><P style="margin: 0.0px 0.0px 0.0px 0.0px; font: 13.0px Lucida Grande">FireWireStuff.com </P> <BR class="Apple-interchange-newline"> </DIV><BR></BODY></HTML>