To avoid this mapping, you must provide explicit values for the Begin and End parameters. The ThrottleLimit parameter value is set to 4 so that the input is processed in batches of four. The Parallel parameter specifies the script block that is run in parallel for each input log name. The ThrottleLimit parameter ensures that all five script blocks run at the same time. The job object is piped to Receive-Job with the Wait switch parameter. A single instance of a ConcurrentDictionary object is passed to each script block to collect the objects.
Since the ConcurrentDictionary is thread safe, it is safe to be modified by each parallel script. A non-thread-safe object, such as System. Dictionary , would not be safe to use here. This example is a very inefficient use of Parallel parameter.
The script simply adds the input object to a concurrent dictionary object. It is trivial and not worth the overhead of invoking each script in a separate thread. Running ForEach-Object normally without the Parallel switch is much more efficient and faster. This example is only intended to demonstrate how to use thread safe variables.
This example writes to the error stream in parallel, where the order of written errors is random. Output: 3 is never written because the parallel scriptblock for that iteration was terminated. Specifies an array of arguments to a method call. Causes the parallel invocation to run as a PowerShell job. A single job object is returned instead of output from the running script blocks.
The job object contains child jobs for each parallel script block that runs. The job object can be used by all PowerShell job cmdlets, to monitor running state and retrieve data.
Specifies a script block that runs before this cmdlet processes any input objects. This script block is only run once for the entire pipeline. Specifies a script block that runs after this cmdlet processes all input objects. Specifies the input objects. ForEach-Object runs the script block or operation statement on each input object. Enter a variable that contains the objects, or type a command or expression that gets the objects.
This is true even if the value is a collection that is the result of a command, such as -InputObject Get-Process. Because InputObject cannot return individual properties from an array or collection of objects, we recommend that if you use ForEach-Object to perform operations on a collection of objects for those objects that have specific values in defined properties, you use ForEach-Object in the pipeline, as shown in the examples in this topic.
Wildcard characters are permitted, but work only if the resulting string resolves to a unique value. Specifies the script block to be used for parallel processing of input objects.
Enter a script block that describes the operation. Specifies the operation that is performed on each input object. This script block is run for every object in the pipeline. When you provide multiple script blocks to the Process parameter, the first script block is always mapped to the begin block. If there are only two script blocks, the second block is mapped to the process block. Ku soo dhawaada hoyga fanaankii Maxamad Mooge Libaan. Waxaa qolkan loogu tala galay wixii ku sahabsan ama ka hadlaya hal-yay Maxamad mooge.
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