Hello, I'm using 6 processors, but it is not easy to tell the resource allocation, because we're using a queue manager. I can tell you that it seems fairly balanced: by means of a web interface, I get full processor use and memory occupation of
17.5% 18.7 13.9 13.7 19.7 18.3 Thank you. Andrea 2010/8/3 <[email protected]> > Hi Andrea, > > Can you be a bit more specific about the number of processors you are using > on your cluster? From the numbers you gave, it looks like you're using only > 1 proc. > > I have a problem with meep-mpi, which only shows proper scaling with 2 > processors, but not more (see ) > > Can you give the perfs stats ? (from the unix "top" command, when job > running) > > Guillaume > > [email protected] a écrit : > > Send meep-discuss mailing list submissions to >> [email protected] >> >> To subscribe or unsubscribe via the World Wide Web, visit >> http://ab-initio.mit.edu/cgi-bin/mailman/listinfo/meep-discuss >> or, via email, send a message with subject or body 'help' to >> [email protected] >> >> You can reach the person managing the list at >> [email protected] >> >> When replying, please edit your Subject line so it is more specific >> than "Re: Contents of meep-discuss digest..." >> >> >> Today's Topics: >> >> 1. Slow execution issue (Andrea Armaroli) >> 2. Re: about magnetostatic waves (Matthew Miskiewicz) >> 3. Unit transformation of dispersion parameters (???) >> 4. Question about magnetostatic waves (Alexandr Sadovnikov) >> >> >> ---------------------------------------------------------------------- >> >> Message: 1 >> Date: Mon, 2 Aug 2010 18:38:57 +0200 >> From: Andrea Armaroli <[email protected]> >> Subject: [Meep-discuss] Slow execution issue >> To: [email protected] >> Message-ID: >> <[email protected]> >> Content-Type: text/plain; charset="iso-8859-1" >> >> Dear MEEP users, prof. Johnson, and other developers, >> >> I'm facing an execution speed issue, that is remarkably slowing down my >> work. >> >> I am trying to study the transmission/reflection response of a structure >> made of semiconductor and metal films (5 poles for 2 media). Also the >> absorption of complex epsilon media interests me. >> >> My domain comprises >> >> (451, 376, 120) >> >> points, and I set 20 as resolution, 0.3 as Courant constant. >> >> Lauched with run-sources+ 5000 (it should be about 350000 steps.) >> >> My choice of using a smaller Courant number than usual is due to >> divergence >> of calculation in a previous attempt. >> >> Well, the structure without scatterers (only dielectric media) keeps >> running >> for 3 days on 6 nodes (1 processor per node) of our (brand new) cluster. >> The structure with scatterers has run for 4 days and has completed only >> half >> of the task. >> >> The first run wrote epsilon, a single point probe, and the flux to >> subtract >> in the second run. This latter is slow even without writing the probe >> file. >> >> We compiled the code with openMPI on Scientific Linux. >> >> I though serial HDF was the problem, but a previous discussion claims >> parallel HDF is worse unless a huge number of CPUs is used. >> >> My boss is an FDTD expert and we're comparing MEEP with his own >> implementation. He is a bit surprised by such a long execution and we >> would >> like to understand why. Could the double precision account for that? Or >> what >> else. >> >> Thank you very much for your help and suggestions. >> >> Andrea. >> >
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