v1.7.3.0 is extremely slow

[codykonior]

I hate to say it but although it has fixed the runspace issues, I've noticed some extremely odd slowdowns using 1.7.3.0 vs the previous 1.7.2.7.

$batch = [Guid]::NewGuid()

Measure-Command {
    1..100 | %{
        Write-Verbose "Starting $_"
        Start-RSJob -Batch $batch -ScriptBlock { "Hi $_" }
    }
}

On 1.7.2.7:

Days : 0
Hours : 0
Minutes : 0
Seconds : 1
Milliseconds : 179
Ticks : 11798296
TotalDays : 1.36554351851852E-05
TotalHours : 0.000327730444444444
TotalMinutes : 0.0196638266666667
TotalSeconds : 1.1798296
TotalMilliseconds : 1179.8296

On 1.7.3.0:

Days : 0
Hours : 0
Minutes : 0
Seconds : 16
Milliseconds : 547
Ticks : 165471210
TotalDays : 0.000191517604166667
TotalHours : 0.0045964225
TotalMinutes : 0.27578535
TotalSeconds : 16.547121
TotalMilliseconds : 16547.121

This doesn't seem like much at 1s vs 16s but on proper workloads (400 jobs, where the script blocks are doing real processing) a 2 minute overall run for all jobs to complete was reaching 20-30 minutes before I stopped it.

[codykonior]

I've gone through back-porting differences between versions to try to find the cause. It's not caused by any of the other changes (like the Get-Variable change, etc). It solely resides in Start-RSJob.

[codykonior]

Oh no, you've commented out the section which passes in Batch numbers.

[proxb]

I do see a slow down between versions. I commented out the batch a while ago until I can solve the issue with using Modules/Functions while using the same runspacepool. If I can get that working properly, then I will put the use of Batch runspacepools back in.

[proxb]

@codykonior Try this version (1.7.3.1) and let me know how it works.

[codykonior]

I really depend on the -Batch functionality so I can't upgrade at this point.

[proxb]

@codykonior Batch functionality was restored in this version.

[codykonior]

Thumbs up, the current version you have checked in seems to be working (no random runspace errors, and the usual great performance with batches).