Created
July 5, 2019 19:56
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Execute PowerShell jobs in parallel with a max concurrency using the while loop polling strategy.
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| $maxConcurrentJobs = 5 | |
| $pollingFrequencyInMilliseconds = 50 | |
| for ($index=1; $index -le 23; $index++) { | |
| while ($true) { | |
| Get-Job -State Completed | Receive-Job | Remove-Job | |
| $concurrencyLimitIsReached = $($(Get-Job -State Running).Count -ge $maxConcurrentJobs) | |
| if ($concurrencyLimitIsReached) { | |
| Write-Host "Reached concurrency limit of ${maxConcurrentJobs}, " -NoNewline | |
| Write-Host "trying again in ${pollingFrequencyInMilliseconds} ms..." | |
| Start-Sleep -Milliseconds $pollingFrequencyInMilliseconds | |
| continue | |
| } | |
| $scriptBlock = { | |
| Param ( | |
| [string] [Parameter(Mandatory=$true)] $id | |
| ) | |
| $durationInMilliseconds = $(Get-Random -Minimum 500 -Maximum 1000) | |
| Start-Sleep -Milliseconds $durationInMilliseconds | |
| Write-Host "Job #${id} completed in ${durationInMilliseconds} ms." | |
| } | |
| Write-Host "Starting Job #${index}..." | |
| Start-Job $scriptBlock -Name "Job #${index}" -ArgumentList $index | Out-Null | |
| break | |
| } | |
| } | |
| Get-Job | Receive-job -AutoRemoveJob -Wait |
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This will output the job results directly after they are completed in the order in which they have finished: