Saving output from background rsh command

[Tony]

Hi,
Hopefully one of you may be able to point me in the right direction.

I am trying to find the load on a range of nodes in a cluster.
I would like to store the uptime from each node in an array I can
create aggregate statistics about the system uptime.

When I rsh the uptime command to each node without the background
operator “&” rsh returns the output of uptime, via command
substitution,
to an array member. I would prefer to have each rsh uptime
call to be in the background (i.e. called with & at the end) so that I
can asynchronously scan the performance of the system. However, when
I include the &, the output from the rsh command is not saved in the
array.

I have tried to put a sleep command in the script to see if a delay
would help,
but it had no effect.

Does anyone have a hint as to how I can capture the output from a
background rsh command? I have included a code snippet below.

Thanks,
Tony

------------------code snippet----------------------------------------
# find the load for each node asynchronously
i=0
while [ $i -lt $count ]
do
# this rsh call returns output
uptimes[$i]=$(rsh ${node_names[$i]} uptime)

# this rsh call in the background does not save output
# uptimes[$i]=$(rsh ${node_names[$i]} uptime) &
let "i +=1"
done

# sleep for 5 seconds to let everyone reply
sleep 5s

# print the load for each node
i=0
while [ $i -lt $count ]
do
echo "node ${node_names[$i]} ${uptimes[$i]}"
let "i +=1"
done

[mail.sac...@gmail.com]

Hi

Were you able to get a response or solve this issue?

Thanks.