Hi,
I was wondering if there is any way to reduce the cpu usage the
openmpi seems to spend in the busy wait loop.
Thanks,
/David
On Thu, Feb 28, 2013 at 4:34 PM, Bokassa wrote:
> Hi,
>I notice that a simple MPI program in which rank 0 sends 4 bytes to
> each rank and receives a reply
Hi ,
First, I don't see any cpu utilization but %time (of a function wrt others in
a process/application).
Generally for high cpu utilization, there could be many reason. Two of them
that comes to my mind is,
1. Depends on the network stack, eg. the "tcp" way will use more CPU than the
"openi
___
From: Jeff Squyres
To: Open MPI Users
Sent: Friday, 2 September 2011 9:45 PM
Subject: Re: [OMPI users] High CPU usage with yield_when_idle =1 on CFS
This might also be in reference to the issue that shed_yield() really does
nothing in recent Linux kernels (there was big debate about this at
ke
This might also be in reference to the issue that shed_yield() really does
nothing in recent Linux kernels (there was big debate about this at
kernel.org).
IIRC, there's some kernel parameter that you can tweak to make it behave
better, but I'm afraid I don't remember what it is. Some googli
On 8/31/2011 11:48 PM, Randolph Pullen wrote:
I recall a discussion some time ago about yield, the Completely F%’d
Scheduler (CFS) and OpenMPI.
My system is currently suffering from massive CPU use while busy
waiting. This gets worse as I try to bump up user concurrency.
Yup.
I am running w
