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Subject: Re: [OMPI users] Begginers question: why does this program
From: Giovani Faccin (giovanifaccin_at_[hidden])
Date: 2008-03-18 08:21:10


Hi Mark

Compiler and flags:

sys-devel/gcc-4.1.2 USE="doc* fortran gtk mudflap nls (-altivec) -bootstrap -build -d -gcj (-hardened) -ip28 -ip32r10k -libffi% (-multilib) -multislot (-n32) (-n64) -nocxx -objc -objc++ -objc-gc -test -vanilla"

Network stuff:

sonja gfaccin # ifconfig
lo Link encap:Local Loopback
          inet addr:127.0.0.1 Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING MTU:16436 Metric:1
          RX packets:33166 errors:0 dropped:0 overruns:0 frame:0
          TX packets:33166 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:9846970 (9.3 Mb) TX bytes:9846970 (9.3 Mb)

wlan0 Link encap:Ethernet HWaddr 00:1C:BF:24:24:91
          inet addr:192.168.1.50 Bcast:192.168.0.255 Mask:255.255.255.0
          inet6 addr: fe80::21c:bfff:fe24:2491/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
          RX packets:5944 errors:0 dropped:0 overruns:0 frame:0
          TX packets:6343 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:3058968 (2.9 Mb) TX bytes:1713598 (1.6 Mb)

wmaster0 Link encap:UNSPEC HWaddr 00-1C-BF-24-24-91-60-00-00-00-00-00-00-00-00
-00
          UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)

I have 2 cards in my laptop, one is an ethernet one that's not enabled (no kernel modules loaded). The other one is the wireless card, which is enabled. Those 2 interfaces appear because the driver creates them. The real one is wlan0.

I'll try to find in the faq where is this flag to specify the card, just in case MPI might be trying to use wmaster0. Let's see if it works.

Thanks!

Giovani

Mark Kosmowski <mark.kosmowski_at_[hidden]> escreveu: Giovani:

Which compiler are you using?

Also, you didn't mention this, but does "mpirun hostname" give the
expected response? I (also new) had a hang similar to what you are
describing due to ompi getting confused as to which of two network
interfaces to use - "mpirun hostname" would hang when started on
certain nodes. This problem was resolved by telling ompi which
network interface to use (I forget the option needed to do this off
the top of my head, but it is in the FAQ somewhere).

Good luck,

Mark
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