SplitPipeline
PowerShell v2.0+ module for parallel data processing. Split-Pipeline splits the input, processes parts by parallel pipelines, and outputs results. It may work without collecting the whole input, large or infinite.
Quick Start
Step 1: Get and install.
SplitPipeline is available as the PSGallery module SplitPipeline. In PowerShell 5.0+ or with PowerShellGet you can install it by this command:
Install-Module SplitPipeline
SplitPipeline is also available as the NuGet package SplitPipeline. Download it by NuGet tools or directly. In the latter case save it as ".zip", unzip, and use the directory "tools/SplitPipeline".
Step 2: In a PowerShell command prompt import the module:
Import-Module SplitPipeline
Step 3: Take a look at help:
help -full Split-Pipeline
Step 4: Try these three commands performing the same job simulating long but not processor consuming operations on each item:
1..10 | . {process{ $_; sleep 1 }}
1..10 | Split-Pipeline {process{ $_; sleep 1 }}
1..10 | Split-Pipeline -Count 10 {process{ $_; sleep 1 }}
Output of all commands is the same, numbers from 1 to 10 (Split-Pipeline does
not guarantee the same order without the switch Order). But consumed times
are different. Let's measure them:
Measure-Command { 1..10 | . {process{ $_; sleep 1 }} }
Measure-Command { 1..10 | Split-Pipeline {process{ $_; sleep 1 }} }
Measure-Command { 1..10 | Split-Pipeline -Count 10 {process{ $_; sleep 1 }} }
The first command takes about 10 seconds.
Performance of the second command depends on the number of processors which is used as the default split count. For example, with 2 processors it takes about 6 seconds.
The third command takes about 2 seconds. The number of processors is not very important for such sleeping jobs. The split count is important. Increasing it to some extent improves overall performance. As for intensive jobs, the split count normally should not exceed the number of processors.
