Thanks all for the answers,
I am parallelizing tomography algorithm which takes about 5 hours using
single processor.
I want to gain full performance and should reduce the computational
time as short as possible.
I was wondering the SSh/RSH launcher could be a performance issue?(I
am jus
Jim Kusznir wrote:
That sounds good; I'm glad there are a variety of tools out there.
However, this now brings me back to my origional problem. I was
successful at compiling openmpi after disabling vt, but if I want to
use (some of) these tools, I'll need that enabled...
Well, it depends...
On Jun 29, 2009, at 7:18 PM, Jim Kusznir wrote:
That sounds good; I'm glad there are a variety of tools out there.
However, this now brings me back to my origional problem. I was
successful at compiling openmpi after disabling vt, but if I want to
use (some of) these tools, I'll need that enab
That sounds good; I'm glad there are a variety of tools out there.
However, this now brings me back to my origional problem. I was
successful at compiling openmpi after disabling vt, but if I want to
use (some of) these tools, I'll need that enabled...So how do I fix
the actual problem and compil
Jim Kusznir wrote:
Ok, trying now. This does bring up a question I've been meaning to
ask. I need to find a way to analyze the efficiency of parallel jobs,
and the only way I've known about in the past is through vampire. I
do not have the software license presently (and last I looked, it was
Ok, trying now. This does bring up a question I've been meaning to
ask. I need to find a way to analyze the efficiency of parallel jobs,
and the only way I've known about in the past is through vampire. I
do not have the software license presently (and last I looked, it was
a commercial licensed
Easiest solution: add -enable-contrib-no-build=vt to your configure line.
This will "no-build" the Vampirtrace code section that is causing the
problem. It isn't required for operations - just there as an option if you
want it for debugging purposes.
Ralph
On Mon, Jun 29, 2009 at 2:31 PM, Jim Ku
Hi all:
I'm trying to build and install openmpi-1.3.2 for my cluster using
enviornment-modules. My build failed, but on something that I have no
idea how to debug. Here's the relevent output:
Making all in vtlib
make[5]: Entering directory
`/usr/src/redhat/BUILD/openmpi-1.3.2/ompi/contrib/vt/vt
My $0.02: there is not much useful that you can learn from system time
vs. user time. The only meaningful metric is total wall clock
execution time.
Open MPI's progression engine is designed to poll aggressively; this
approach does not work well in oversubscribed environments. You can
s
On Jun 29, 2009, at 2:19 AM, vipin kumar wrote:
Q. Since I am using TCP/Ethernet I guess that MPI uses SSH/RSH to
communicate between peers.
Ans. May be you are right. I don't know exactly how peers
communicate in MPI environment, but I can say for sure that OpenMPI
uses rsh/ssh as one of
Hi,
Am 29.06.2009 um 08:08 schrieb jody:
Hi Umanga
Yes, ssh (or rsh) should be configured on every machine, and it must
be configured
in such a way that no passwords are needed to make a connection.
For example,
for passwordless connection using ssh i place every node's public
key into
th
Hi Ashika,
Q. Since I am using TCP/Ethernet I guess that MPI uses SSH/RSH to
communicate between peers.
Ans. May be you are right. I don't know exactly how peers communicate in MPI
environment, but I can say for sure that OpenMPI uses rsh/ssh as one of the
available launchers.
Q. And for that, e
Hi Umanga
Yes, ssh (or rsh) should be configured on every machine, and it must
be configured
in such a way that no passwords are needed to make a connection. For example,
for passwordless connection using ssh i place every node's public key into
the file ~/.ssh/authorized_keys of every node.
And,
Hi all,
I am trying to spawn dynamically processes in remote as well as local
machine using MPI::Intracomm::Spawn_multiple. I am using MPI::Info object to
tell where to launch processes using "host" key and "" as its
value but but I am getting the error
--
Hi Vipin ,
Thanks alot for the reply.
I went through the FAQ and it also answered some of my questions.
But my problem is, since I am using TCP/Ethernet I guess that MPI uses
SSH/RSH to communicate between peers.
And for that, each peer should have the copy of the application right?
I use 1.2
Hi,
I am not expert, I am user like you but I think I can help you,
Q. After installing OpenMPI on each machine ,do i need to run a
service/daemon on each machine?
Ans. No, not at all, Open MPI takes care of that for you.
Q. How does peers in MPI environment communicate ?
Ans. Using Communicator(
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