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Subject: [OMPI users] "ssh: connect to host XXX.XXX.XXX.XX port 22: connection timed out" errors during mpirun
From: vacate (vacatehoping_at_[hidden])
Date: 2013-06-04 12:48:41


Hello everyone,

After solving my first ssh_exchange_identification problem,
I feel embarrassed to ask my another problem... :'((

I got some "*ssh: connect to host XXX.XXX.XXX.XX port 22: connection timed
out*" errors
when I mpirun over 2000 times almost at the same time.

---
my bash shell script file :
   for (( index=0; index<2000 ; index++))
      do
          (time mpirun --hostfile my_hostfile openMPI_test &) >> file 2>&1
      done
---
*
*
*But not "always" got this problem, just "often"*.(It seldom works well.)
*In addition, the amount of "timed out" error in each test are different*.
(In 2000 times, this error happened between 0~200 times)
I try to google it,
but I can't find anyone have this ssh problem when he/she use a lot of ssh
connections...
So I think maybe someone here have had the same problem as mine.
----------------------------------------------------------------------------------
The following are some of my settings that I have tried to change :
1. net.ipv4.tcp_fin_timeout=180
http://askubuntu.com/questions/21182/how-to-change-the-default-timeout-of-internet-connection
2. sudo iptables -A INPUT -p tcp --dport ssh -j ACCEPT
http://www.serkey.com/ubuntu-ssh-connection-timed-out-due-to-firewall-behgct.html
----------------------------------------------------------------------------------
but these changes still didn't solve my problem...
I still can't figure out where is the problem and are there some potential
problems :(((
If someone here have any idea about this situation ,or have had the same
problem as mine?
Is it my *machine problem* or *system problem*? Or *OpenMPI* can't let me
do something like this?
Really hope someone can give me a hand ..
Thank you all very very very much!!
Best Wishes,
Jen