Newsgroups: comp.parallel.pvm From: Dima Pasechnik Subject: PVM on 32-bit *and* 64-bit machines - double/float question Organization: Delft University of Technology Date: 04 Aug 1998 19:21:05 +0200 Message-ID: We are running PVM on a network that has Linux (Pentium II, 32-bit) PVM 3.3.11 (public release) HPPA (HP9000, 32-bit) PVM 3.3.11 (public release) Unicos (CRAY J90, 64-bit) PVM 3.3.10 (CRAY release) hosts. There appear to be a kind of incompatibility with the floating point data within PVM. On the 1st two types of machines, PVM_DOUBLE (and C double) is 8 byte, while on CRAY it's 16 byte. There is no need to use the CRAY double, it would suffice to use CRAY float for our problems. However, PVM does not seem to be able to permit data that is packed via pvm_pkdouble from the 32-bit machine to be (properly) unpacked on 64-bit machine as (8-byte) float. We have to use CRAY double instead, that is not really what we want (as well as much slower and memory-hungry). Is there any way around this? (surely I'm not the first to come across such a situation.) All the pointers etc are most appreciated. Dmitrii. Dmitrii V. Pasechnik e-mail: D.Pasechnik@twi.tudelft.nl SSOR, TWI office location: TU Delft HB 05.150 Postbus 5031 Mekelweg 4 2600 GA Delft 2628 CD Delft The Netherlands phone: +31-(0)15-2782520 fax: +31-(0)15-2787255 http://ssor.twi.tudelft.nl/~dima