On 11/24/2012 4:02 PM, Ralph Castain wrote:
Try limiting the interfaces we use to see if that's really the problem. I forget if
cygwin has "ifconfig" or not, but use a tool to report the networks, and then
start excluding them by adding
-mca oob_tcp_if_exclude foo,bar
to your cmd line until you find the one that is causing the hang. That will (a)
confirm that it is a network timeout issue, and (b) which network is causing
the problem.
Ralph,
I was unable to exclude in this way the interface using
one of the several "strange" name windows use for the interfaces
{258B6C87-9B24-477D-A5D1-97AE07FEABAB}
NPF_{258B6C87-9B24-477D-A5D1-97AE07FEABAB}
But I found the root cause: The driver of the Vodafone USB InternetKey.
So for the next one hitting the same or similar issues:
in theory the interface was disabled, but it seems that when queried
the driver tries to contact Vodafone servers through any active interface .
Thanks to Wireshark I was able to notice the driver polling behaviour.
After removing all versions of the driver ( following [1] ) ,
the delay disappeared.
$ time orterun -n 4 ./hello_c.exe
Hello, world, I am 0 of 4
Hello, world, I am 2 of 4
Hello, world, I am 1 of 4
Hello, world, I am 3 of 4
real 0m2.552s
user 0m0.933s
sys 0m1.774s
[1] http://www.petri.co.il/removing-old-drivers-from-vista-and-windows7.htm
Regards
Marco
On Nov 24, 2012, at 1:00 AM, marco atzeri <marco.atz...@gmail.com> wrote:
on cygwin running on localhost on standalone computer I noticed
a large time discrepancy when the computer is connected or not to
the network.
Physical Connected:
marco@MARCOATZERI /pub/devel/openmpi/examples
$ time mpirun -n 4 ./hello_c.exe
Hello, world, I am 0 of 4
Hello, world, I am 1 of 4
Hello, world, I am 2 of 4
Hello, world, I am 3 of 4
real 1m14.568s
user 0m1.496s
sys 0m2.602s
NOT connected (all interface down)
$ time mpirun -n 4 ./hello_c.exe
Hello, world, I am 0 of 4
Hello, world, I am 2 of 4
Hello, world, I am 1 of 4
Hello, world, I am 3 of 4
real 0m3.323s
user 0m1.480s
sys 0m2.118s
I guess the 1 minute is due to some time of timeout.
Is such delay present on any other platform ?
Any workaround to remove it ?
Regards
Marco
_______________________________________________
users mailing list
us...@open-mpi.org
http://www.open-mpi.org/mailman/listinfo.cgi/users
_______________________________________________
users mailing list
us...@open-mpi.org
http://www.open-mpi.org/mailman/listinfo.cgi/users
