Re: [Beowulf] Problems with a JS21 - Ah, the networking...

2007-10-01 Thread Ivan Paganini
Hello Mark, Patrick, >>The spawning phase in MPICH-MX uses socket and ssh (or rsh). Usually, >>ssh uses native Ethernet, but it could also use IPoM (Ethernet over >>Myrinet). Which case is it for you ? As I said before, I'm also experiencing some ether problems (in the service network) like TCP w

Re: [Beowulf] Problems with a JS21 - Ah, the networking...

2007-10-01 Thread Ivan Paganini
k=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x40046f68) = 31384 waitpid(-1, _______ Thanks. 2007/10/1, Ivan Paganini <[EMAIL PROTECTED]>: > Hello Chris, everybody: > > I am not using jumbo frames, and I'm now consid

Re: [Beowulf] Problems with a JS21 - Ah, the networking...

2007-10-01 Thread Ivan Paganini
I'm now trying to make a better undestanding that what is happening. Thank you. Ivan 2007/9/29, Chris Samuel <[EMAIL PROTECTED]>: > On Sat, 29 Sep 2007, Ivan Paganini wrote: > > > I sniffed the network in the store nodes interface, and i got lots > > of TCP lost fr

Re: [Beowulf] Problems with a JS21 - Ah, the networking...

2007-09-29 Thread Ivan Paganini
Hello Mark! 2007/9/29, Mark Hahn <[EMAIL PROTECTED]>: > > I sniffed the network in the store nodes interface, and i got lots of > > TCP lost fragment, previos lost fragments, ack lost fragments and TCP > > window size full. The GPFS is now heavily used. > > so this indicates that you have a seriou

Re: [Beowulf] Problems with a JS21 - Ah, the networking...

2007-09-29 Thread Ivan Paganini
from 1.1.6 to 1.2.2. Thank you. Ivan 2007/9/29, John Hearns <[EMAIL PROTECTED]>: > On Fri, 2007-09-28 at 17:43 -0300, Ivan Paganini wrote: > > Hello everybody, > > > > I am beginning to take care of an IBM's JS21. The cluster consists of > > > The myrinet co

[Beowulf] Problems with a JS21 - Ah, the networking...

2007-09-28 Thread Ivan Paganini
Hello everybody, I am beginning to take care of an IBM's JS21. The cluster consists of 112 nodes (8 bladecenters), plus 3 Power5 management nodes (1 headnode and 2 storage) and a DS4200 storage array. We are using now GPFS as the file system in the cluster in a gigabit dedicated service network (u

Re: [Beowulf] Question about amd64 architecture and floating point operations

2006-11-22 Thread Ivan Paganini
Thank you for all the answers.. now the subject is clearer. And I thought that I knew something about comp. architecture... Thanks! Ivan 2006/11/22, Richard Walsh <[EMAIL PROTECTED]>: Ivan Paganini wrote: > Hello everybody at beowulf. Sorry about the _really_ newbie question, &g

Re: [Beowulf] Question about amd64 architecture and floating pointoperations

2006-11-22 Thread Ivan Paganini
en using above tips that shouldn't happen too quickly and in doubles you should have roughly 52 * log(2) / log(10) = 52 / 3.322= 15 digits or so Good Luck! Vincent ----- Original Message - *From:* Ivan Paganini <[EMAIL PROTECTED]> *To:* beowulf@beowulf.org *Sent:* Wednesday, N

Re: [Beowulf] Question about amd64 architecture and floating pointoperations

2006-11-22 Thread Ivan Paganini
Of course I forgot the code... ;-) 2006/11/22, Ivan Paganini <[EMAIL PROTECTED]>: Thank you Jonh and Vincent for the answers! Well, I did a little more research, and tested a very simple code (anexed). Ran ldd on it, and got + [EMAIL PROTECTED]:~$ ldd a.out libc.so.6 => /lib/

[Beowulf] Question about amd64 architecture and floating point operations

2006-11-22 Thread Ivan Paganini
Hello everybody at beowulf. Sorry about the _really_ newbie question, but after doing some tests and researching a little, a question arose when fooling around with amd64 (more precisely, an amd64 Athlon 4200 X2) and gcc and sun studio 11. The architecture has 64 bits integer registers and 128 bit

Re: [Beowulf] cluster softwares supporting parallel CFD computing

2006-09-06 Thread Ivan Paganini
We, at LFC, have some specific requests, and our cluster is not large (much less powerfull than yours, a bunch of old PIII), so we use debian stable as OS, MPICH 1.2.7 as Message Passing Libraries, Portland Group Compilers and Intel Compilers, and netlib lapack and scalapack. We also use ACML with

Re: [Beowulf] Optimal BIOS settings for Tyan K8SRE

2006-09-06 Thread Ivan Paganini
Can you post what were the tweaking that you had undergone to access the 4GB?  Thank you.On 8/31/06, stephen mulcahy < [EMAIL PROTECTED]> wrote: Hi,I'm maintaining a 20-node cluster of Tyan K8SREs (4GB RAM, dual Opteron270s) which are being used primarily for Oceanographic modelling (MPICH2running

[Beowulf] Problem using PGI compiler to link BLACS with mpich

2006-05-08 Thread Ivan Paganini
Hello everybody at Beowulf: this is a rather silly question, but itgiving me a long lasting headache, so maybe someone here can help me. Iam trying to compile my scalapack application without using the ACML 3.1.0, that has some bugs and problems with compilers, besides someother problems. So, I am

[Beowulf] Problem using mpich2 and scalapack

2006-03-08 Thread Ivan Paganini
Hello everybody! My first time here at beowulf list, and hope some bright soul will help me! I am trying to use at the same time some mpich2 routines and scalapack. My code is written in fortran90, and I am using pgi compilers to compile everything. Lapack and blas are from acml 2.5.0. First, I ra