[mpich-discuss] MPI_Send in 32bit mpich2 (1.4) hangs in 64bit win7

[Jayesh Krishna]

Hi,
 It looks like Windows firewall (or some other software) is blocking TCP/IP connections between the machines. 
 These kind of issues could also result from an incorrect network setup. You might want to try pinging each machine from the other (Note that it is not enough to ping all machines from the machine that you launch your job. You also need to make sure that each machine is accessible/pingable from the all the other machines).

Regards,
Jayesh

----- Original Message -----
From: "shridhar mohan" <shri.emi at gmail.com>
To: mpich-discuss at mcs.anl.gov
Sent: Thursday, July 21, 2011 3:30:47 PM
Subject: [mpich-discuss] MPI_Send in 32bit mpich2 (1.4) hangs in 64bit win7


Hello , 

I have been reading through the mailing lists 
and i must say you guys are doing a nice job. 

I started to set up MPICH2 last week. 
We have cluster of 5 computers running 64-bit win 7. 

I installed 64-bit Mpich2 ver 1.4 in three of the machines. 
Turned the Firewall down. 

Smpd -status on each machine return's running. 
However when i try to find the status of other hosts 
it simply times out. 

So uninstalled 64 bit and installed 32-bit as instructed 
in section 9.4 of the installation guide. 
Everything seems to be fine in 32 bit. 
I was able to run "hello world" using multiple hosts. 

But, when i try to send data using MPI_Send from 
one host to the other, It simply hangs. 
However, process within the same host are able to 
send and receive data using MPI_Send. 

This is very puzzling to me, 
Am I doing anything wrong. 
It will be helpful if someone can point me in the 
right direction. 


-Thanks 
shridhar 

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