startup script for multiprocess q - kdb

Question

I'm trying to start up kdb with multiple processes to use to write scripts with KDB developer.
I understand that the processes that are set up need to be done so outside of the master process.
I have attempted to do this with a function in my .bashrc that creates 7 instances which are expecting a maximum of 8 processes. I then start up a final process with developer.
When I do this and try to connect, my OS informs developer that the connections are refused.
Could you advise on the correct way to start 8 processes to use with IPC in KDB?
This is my multiple process startup function in .bashrc:
mq() {
echo "Spawning 7 q processes";
q -s -8 -p 20001;
q -s -8 -p 20002;
q -s -8 -p 20003;
q -s -8 -p 20004;
q -s -8 -p 20005;
q -s -8 -p 20006;
q -s -8 -p 20007;
}
This is the code in .bashrc to start developer:
# Assumes user name is claude and opens Q with 8 threads. (to build separate processes use a negative number)
alias q='rlwrap -r q -s -8'
# Developer set to open with 8 threads. (to build separate processes use a negative number)
alias developer='source /pathToDir/developer/config/config.profile; rlwrap -r q /pathToDir/developer/launcher.q_'
To start all this up, I open one terminal and type mq then open another terminal and type developer
Once in developer, I assign a handle to each process like this:
{hopen("::",string[20000+x])}each 1+til 7
Then the system tells me that the connection is refused.
How should I do this?
Thanks and regards,

Answer 1

I think you should use & when start multiple q processes in your shell script:
mq() {
echo "Spawning 7 q processes";
q -s -8 -p 20001 &
q -s -8 -p 20002 &
q -s -8 -p 20003 &
q -s -8 -p 20004 &
q -s -8 -p 20005 &
q -s -8 -p 20006 &
q -s -8 -p 20007 &
}
mq
Without &, only 1 process will be open at one time.
It work for me:
./mq.sh
bchen#homer:~$ ./mq.sh
Spawning 7 q processes
q)q)q)q)q)q)
In q session:
q){hopen("::",string[20000+x])}each 1+til 7
4 5 6 7 8 9 10i

Answer 2

To connect to q process, hopen should be used.
In a q session:
q){hopen("::",string[20000+x])}each 1+til 7
6 7 8 9 10 11 12i
It returns handles for each process.
We could make use of these handles to send commands for each process.