From: Paolo Pumilia Newsgroups: comp.lang.fortran,comp.parallel.pvm Subject: fortran77 programming Date: Sun, 29 Nov 1998 06:16:02 +0100 Organization: CSTC Message-Id: <3660D892.E1EDBF12@est.it> Reply-To: pumilia@est.it Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Cc: pumilia@est.it Xref: ukc comp.lang.fortran:61704 comp.parallel.pvm:7800 Hi all, I plan to set up a libc6 based linux box with to processors on the mainboard to speed up the execution of cyclic fortran routines. I am currenlty involved with dynamilcal simulations in statistical physics where two or more do-loops are nested and executed a very large number of times. I run through parallel-processing howto but i need some quick hints, since i am very new to this matter. My first questions are: - will my fortran77 programs, without any change, run in parallel on a two processor machine, provided that kernel as been compiled using SMP=1 in the makefile? - Are there special directive to the g77 compiler that can be added to my routines in order to get a better efficiency ? - Do you suggest to rewrite do-loops in a different language? - When other programs are running together wth the dynamical simulation, will the linux kernel be able to distribute the load between the two processor or one of them wil be overloaded? Finally, technical notes are welcome. My idea is to get two celeron-intel processors with shared memory and pci bus. What about heating of the chipset, when cpu intensive applications are run for tens of hours? Thank you for your help Paolo Pumilia -- --- CSTC