Linux command parallel for multi-process parallel computing

Requirements Analysis:

Suppose we have three processes A and B and C, each corresponding to three run script a.sh,b.sh,c.sh.

A and B two processes are completely independent.

C process must wait until both the A and B processes are finished before the C processes can be started.

We now need to write a script to run these three program scripts

Workaround:

"Not ideal" in series:

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1. a.sh;
2. b.sh;
3. c.sh;

But if these three processes are going to run for a particularly long time, if 10 hours or so.

In this way, the total time required to run is 30 hours.

Because we know that A and B are independent of each other, we should connect A and B in parallel and then in series with C.

The uptime is optimized to 20 hours.

In parallel we can not use the way in the background, if you run A or B in the background, C needs to wait for a and B to run the end before starting, but C do not know when a and B when the end.

The simplest way to think about it temporarily is to "introduce the parallel command to solve ":

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1. Parallel-j 2 "sh a.sh" "Sh b.sh";
2. SH c.sh

In this way A and b are paralleled by parallel, and when both A and B are finished, the parallel command runs.

And then the C program. (To meet our requirements)

Linux command parallel for multi-process parallel computing