MathGroup Archive 1999

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: Performance Problem

  • To: mathgroup at
  • Subject: [mg15381] Re: [mg15370] Performance Problem
  • From: "Kevin J. McCann" <kevinmccann at>
  • Date: Tue, 12 Jan 1999 03:14:44 -0500
  • Sender: owner-wri-mathgroup at

Suspect that your problem is the graphics board.  Which one and how much
memory on it.  When I upgraded my system, I went from 200 MHz to 450
MHz, but the graphics performance was a lot better than the ratio of
clocks because I went from a 4 Mb board to an 8 Mb.


-----Original Message-----
From: Hermann Meier <hmeier at> To: mathgroup at
Subject: [mg15381] [mg15370] Performance Problem

>A benchmark for Mathematica is available at
> I tried to
>assess the performance of the following system: Dual-Pentium II 450
>MHz, ASUS P2B-D/P2B-DS AGP Mainboard, 512 kB Cache, 256 MB RAM, Windows
>NT 4.0 Workstation / SP 3; Mathematica 3.0.1, latest MathKernel.exe -
>file (appr. 50 kB) from
> My
>computer had no other relevant workload.
>The benchmark site has (amongst others) results for a system with one
>Pentium II 400 MHz. Apart from that, this system has the same
>specifications, and the same version of Mathematica is running.
>Results for integer computations, floating point computations and
>symbolic computations were not suprising: My system had a slight
>performance edge.  But when computing and rendering graphics, a severe
>performance problem showed up. My system may be
>completely out of order, but I cannot see why.
>It took my system no less than 34.7 sec (!!) to render the Koch
>snowflake; the other system
>finished in 13.8 sec. The results for the Klein bottle were less
>pronounced: 19.7 sec on my computer, 15.9 sec on the other system.
>Results for the last graphics benchmark (three pipes) were normal.
>I tried to look closer into the problem: - The special driver for my
>graphics card was disabled (booting in VGA-mode): No effect.
>- One CPU was disabled (/onecpu in boot.ini): Snowflake 34.7 sec, Klein
>bottle 24.8 sec.
>- $RecursionLimit was set to Infinity: No effect. - Page Faults/sec were
>very high, but the maximum (8000) occured during the computation of
>three pipes (that gave inconspicuous results). - Pages/sec (=disk
>activity) was zero for Snowflake and very low (max < 30) for Klein
>bottle; so nearly all page faults were "soft". - Cache Faults/sec were
>lowest (Max <= 4) when rendering Snowflake.
>I am at my wit's end and would appreciate expert advice. - Thank you in
>advance !
>Hermann Meier
>hmeier at

  • Prev by Date: Solving A x = Lam B x with A & B singular
  • Next by Date: RE: listplot and notebook directory
  • Previous by thread: Performance Problem
  • Next by thread: Re(2): assumption, supposition?