[MPICH] MPI_Bcast hangs in Windows XP

[Richard Li]

Jayesh,

Thanks a lot for your info.

After a lot of trys, I was finally able to run cpi.exe across multiple hosts. It seems to have something to with the setting in my machine file. The following is the detail.

I use the following command to run cpi.exe:

mpiexec -n 2 -machinefile config.txt -channel ssm(or others) cpi.exe

a) If I have a config.txt file like the following:
    host1name:1 -ifhn host1_ipaddress
    host2name:2 -ifhn host2_ipaddress
   Everything works fine(for all channels).
b) If I have a config.txt like the following:
   host1name:1
   host2:name:2
 then, for sock channel, it hangs mpi_bcast. For auto and ssm, I got the following error message:
  
C:\public\bin>mpiexec -n 2 -machinefile 
Config.txt -channel ssm  or auto 
C:\public\bin\cpi.exe
Enter the number of intervals: (0 quits) 
100
 
job aborted:
rank: node: exit code[: error 
message]
0: B0016350B383E: 1: Fatal error in MPI_Bcast: Other MPI error, 
error stack:
MPI_Bcast(784).................: MPI_Bcast(buf=0012FE88, 
count=1, MPI_INT, root=0, MPI_COMM_WORLD) 
fai
led
MPIR_Bcast(230)................:
MPIC_Send(36)..................:
MPIDI_EagerContigSend(146).....: 
failure occurred while attempting to send an eager 
message
MPIDI_CH3_iStartMsgv(224)......:
MPIDI_CH3I_VC_post_connect(555): 
[ch3:sock] rank 0 unable to connect to rank 1 using business card 
<po
rt=3872 description=B001279FD7C60.corp.bankofamerica.com 
ifname=171.188.32.154 shm_host=B001279FD7C60.
corp.bankofamerica.com 
shm_queue=39E4F281-FCC0-4f4a-B540-EDC8D517F065 shm_pid=2484 
>
MPIDU_Sock_post_connect(1228)..: unable to connect to 
B001279FD7C60.corp.bankofamerica.com on port 387
2, exhausted all endpoints 
(errno -1)
MPIDU_Sock_post_connect(1244)..: gethostbyname failed, The 
requested name is valid and was found in th
e database, but it does not have 
the correct associated data being resolved for. (errno 11004)
1: 
B001279FD7C60: 1
I know this has something to do with my network setting, but just can't figure out why.

Any ideas?

Thanks

Richard




From: jayesh at mcs.anl.gov
To: xs_li at hotmail.com
CC: mpich-discuss at mcs.anl.gov
Subject: RE: [MPICH] MPI_Bcast hangs in Windows XP
Date: Thu, 6 Sep 2007 09:25:36 -0500










Hi,
 The process manager (smpd) is responsible for 
launching the MPI processes on the various machines and providing an MPI 
processes information on how to communicate with other MPI 
processes.
 The SMPD process manager listens (default 
case) on port 8676 and then asks the client PM to connect to a new port. So 
you should allow SMPD process manager (smpd.exe --- installed as a service in 
windows) to communicate at all ports (This is the easiest way. However you can 
also restrict the port range used by SMPD. Refer to the windows devloper's guide 
available at http://www-unix.mcs.anl.gov/mpi/mpich/ for 
details.)
 Make 
sure that no firewall (1. Running on the individual machines   2. OR 
on the network, filtering the traffic btw the machines) is preventing the 
process managers & the MPI procs on the individual machines from 
contacting each other.
 
(Note: Since 
you do not know what changed in your network, it might help if you try analyzing 
the network packets sent btw the machines using a packet sniffer like 
Ethereal.)
 
Regards,
Jayesh



From: owner-mpich-discuss at mcs.anl.gov 
[mailto:owner-mpich-discuss at mcs.anl.gov] On Behalf Of Richard 
Li
Sent: Wednesday, September 05, 2007 8:21 PM
To: 
mpich-discuss at mcs.anl.gov
Subject: [MPICH] MPI_Bcast hangs in Windows 
XP




Hi 
there,
 
I am writing an 
application in Windows XP/VC8 and am having problem with MPI_Bcast(). I am 
working in corporate environment and suspect it may have something to do with 
our security policies, however, I don't know exact which low-level operations 
failed . 
 
Here is the symptom: my 
application (as well as cpi.exe example) works fine as long as there is only one 
machine in the machine file, whether its local machine or remote does not 
matter. It hangs at MPI_Bcast() when I have more than one machine in 
MPI_COMM_WORLD. I am using 
mpich2-1.0.5p2-win32-ia32.msi.
 
The same application 
worked perfectly a year ago and there have been many security policy changes 
since that time(as usual, all policies reduce our freedom). My question is that 
what's the communication mechanism used in inter-node communication. I tried 
nothing, auto, sock, ssm as communication channels and had no 
luck.
 
Thanks for your 
help.

Richard



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