Bash scripting, react immediately to signals

Question

I have a shell script which runs very large simulation binaries. This becomes problematic when I want to request some output of variables in the script. For instance, when I run 10 large simulations, I want to be able to print which iteration I am on without having to wait a minute or two for the current simulation to terminate.

Currently, I am using the trap command. However, the script does not react immediately to signals but will only execute the binded function when the current iteration terminates. I will post the code if anyone needs it.

Carlos Bribiescas · Accepted Answer · 2015-04-17 20:24:16Z

1

You should start threads for each large thing you're going to run. Have those threads dump results somewhere, then you have your main method free waiting to interrogate the results on the fly.

answered Apr 17, 2015 at 20:24

Carlos Bribiescas

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3 Comments

mrQWERTY Over a year ago

Hmm, would it be better to just create one thread which does the simulations instead of spawning a new one for each? Because the order matters and if I spawn multiple threads per run, then the order cannot be guaranteed.

mrQWERTY Over a year ago

In addition, when mentioning threads, I have not found any tutorials about it. Are you talking about &? I thought that was for a separate process.

chepner Over a year ago

It is. Shell scripts do not use threads; they can only start additional processes.

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