From: Kevin Williams Newsgroups: comp.parallel.mpi Subject: Fast honking network MPI "buflimit" problem! Date: Fri, 07 May 1999 11:37:03 +0200 Organization: EMSS Message-Id: <3732B43F.11B644A1@emss.co.za> Reply-To: williams@emss.co.za Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="------------0FDA0BD3EE004ACD64AEE330" Cache-Post-Path: earth.adept.co.za!unknown@emss.co.za Xref: ukc comp.parallel.mpi:5048 This is a multi-part message in MIME format. --------------0FDA0BD3EE004ACD64AEE330 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Hi All, I've got a 4 single CPU Beowulf, 100Mbits with a quad Ethernet card. When running the MPI test program "buflimit", I have success with 2 nodes, but it hangs as soon as I go to three nodes or more. I picked this up with other software we are developing, which hangs at some stage (I think as the communication load gets high) and EVENTUALLY dies with a net_recv error. I've tried fiddling with the P4_SOCKBUFSIZE environment variable, but no joy. Has anybody seen this type of thing? Best regards, Kevin Williams -- ----------------------------------------------------------------------- Dr Kevin Williams, MIEEE Electromagnetic Software and Systems (EMSS) Stellenbosch, South Africa [http://emss.co.za] Tel/Fax: +27 21 880-1880/+27 21 880-1880/1727 PGP Fingerprint [0F 55 2E 51 63 05 C4 AC 01 C7 53 67 2E 47 6C 2A] ----------------------------------------------------------------------- --------------0FDA0BD3EE004ACD64AEE330 Content-Type: text/x-vcard; charset=us-ascii; name="williams.vcf" Content-Transfer-Encoding: 7bit Content-Description: Card for Kevin Williams Content-Disposition: attachment; filename="williams.vcf" begin:vcard n:Williams;Kevin tel;fax:+27 21 880-1880 tel;work:+27 21 880-1880 x-mozilla-html:FALSE url:http://www.emss.co.za org:EMSS adr:version:2.1;;PO Box 1354;STELLENBOSCH;;7599;South Africa version:2.1 email;internet:williams@emss.co.za fn:Dr K Williams end:vcard --------------0FDA0BD3EE004ACD64AEE330--