Starting Parallel Runs
Learn how to start parallel runs in Kognitos.
Overview
In Kognitos, a process can call and run multiple subprocesses in parallel using the start a run
syntax. Starting parallel runs enables the parent process to explicitly wait for the runs, retrieve the statuses, and fetch the outputs.
Parent Process
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Parallel Subprocess Parallel Subprocess Parallel Subprocess
This method is ideal when multiple subprocesses need to run simultaneously and you need to retrieve the statuses or outputs of multiple runs.
How Can I Start Parallel Runs?
This section describes how to start parallel runs using the start a run
syntax.
Syntax
process each item as follows:
start a run where
the procedure is "{subprocess name}"
{input}
Parameters
item
: Object to loop over.subprocess name
: The name of the subprocess.input
: Objects to pass to the subprocess, if necessary.
Example
the items are "apples", "flour", "eggs", "milk"
process each item as follows
start a run where
the procedure is "to make apple pie"
the ingredient is the item
Click here to walk through an end-to-end example.
Remember to Publish Your Process
You need to promote your automation from the Playground to a Process in order to start parallel runs. This applies to both the main parent process and the subprocess. Otherwise, you will get an Assertion Error
saying procedure not found
.
Handling Subprocess Runs
A parent process can explicitly wait for the runs of a subprocess. By waiting for completion, a parent process can also collect the data and outputs from all the subprocess runs.
Adding an Explicit Wait
To add an explicit wait, include the following line into your automation after starting parallel runs:
wait for the runs
Once this is executed, a tab will appear in the user interface, allowing you to view the status of each individual run.

Customizing the Wait Time
You can customize the wait time by adjusting the wait count before starting parallel runs.
The wait count refers to the number of 5-second intervals.
The wait time is calculated by multiplying the wait count by 5.
The default wait count is 60.
The default wait time is 5 minutes (60 x 5 = 300 seconds, or 5 minutes).
the department's max retry wait count is {intervals}
In the example below, setting intervals to 3 results in a total wait time of 15 seconds (3 x 5 seconds).
the department's max retry wait count is 3
Getting Output From Parallel Runs
To get results from subprocesses that are called with the start a run
syntax, use the following syntax after adding an explicit wait:
Syntax
Below is a line-by-line overview of the automation syntax. Expand each line to learn more.
Examples
1. Singular Run
retrieve data from the run where
the fact names are "output sum"
get the output sum from the data
2. Multiple Runs
retrieve data from the runs where
the fact names are "status"
get the statuses from the data
Walkthrough: Run Parallelization
This is an example walkthrough of invoking multiple instances of a subprocess in parallel runs.
Parent Process
the department's max retry wait count is 2
the names are "Eva", "Ivan", "Leo", "Nia", "Zoe"
process each name as follows
start a run where
the procedure is "to greet the user"
the user is the name
wait for the runs
retrieve data from the runs
the fact names are "greeting"
get the greetings from the data
Line 1
The wait count is set to 10 seconds (2 intervals of 5 seconds).
Line 2
A data element is defined as a list of names.
Line 3
Initiates a loop across the list of names.
Line 4
Initiates subprocess invocation using start a run where
syntax.
Line 5
Specifies the name of the published subprocess to call.
Line 6
Passes input to the subprocess: the name
is passed as the user
.
Line 7
Sets an explicit wait for the subprocess runs.
Line 8
Explicitly retrieves the greeting
output from the subprocess runs.
Subprocess

Line 1
Data is defined as a string that says "Hello "
Line 2
The user
is added to the end of the greeting.
Line 3
The automation outputs a greeting with the user's name at the end.
Subprocess Output
In line 9, the greetings
is referenced as output from the subprocess runs. The results are:
Hello Eva
Hello Ian
Hello Leo
Hello Nia
Hello Zoe
Additionally, each individual run can be clicked through in the platform:

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