Create run-jpegoptim-parallel.ps1

run-jpegoptim-parallel.ps1

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+# run-jpegoptim-parallel.ps1
+# Split all *.jpg files in the current directory into 8 groups
+# and run jpegoptim in 8 parallel processes.
+
+# Number of processes to start (max 8; if files < 8, use file count)
+$parts = 8
+
+# Path to jpegoptim executable (keep quotes if there are spaces / non-ASCII characters)
+$exe = "E:\jpegoptim-1.5.6-x64-windows\jpegoptim.exe"
+
+# Base jpegoptim parameters: -m 80 -p -t -n
+$baseArgs = @("-m","80","-p","-t","-n")
+
+# Print current date and time
+$startTime = Get-Date
+Write-Host "Script start time: $($startTime.ToString('yyyy-MM-dd HH:mm:ss'))" -ForegroundColor Green
+Write-Host ""
+
+# Find all jpg/jpeg files in current directory (case-insensitive)
+$files = Get-ChildItem -File *.jpg, *.jpeg |
+         Sort-Object Name |
+         Select-Object -ExpandProperty FullName
+
+$count = $files.Count
+if ($count -eq 0) {
+    Write-Host "No *.jpg / *.jpeg files found in current directory."
+    return
+}
+
+if ($count -lt $parts) { $parts = $count }
+
+# Compute group size (ceil so groups differ by at most 1)
+$per = [math]::Ceiling($count / $parts)
+
+Write-Host "Found $count images, split into $parts groups, approx $per per group (last group may be smaller)."
+
+$processes = @()
+
+for ($i = 0; $i -lt $parts; $i++) {
+    $start = $i * $per
+    if ($start -ge $count) { break }   # no more files → exit loop
+
+    $end = [math]::Min($start + $per - 1, $count - 1)
+    $group = $files[$start..$end]
+
+    # Write list of file names into a txt file (one per line)
+    $currentDir = Get-Location
+    $txtFile = Join-Path $currentDir "jpegoptim_files_$i.txt"
+
+    # Write list using UTF-8 without BOM (because BOM breaks first line)
+    $utf8NoBom = New-Object System.Text.UTF8Encoding $false
+    [System.IO.File]::WriteAllLines($txtFile, $group, $utf8NoBom)
+
+    Write-Host "Starting process $($i+1): files $($start+1)-$($end+1) (count: $($group.Count))"
+    Write-Host "  File list written to: $txtFile"
+
+    # Build argument list (base args + --files-from=)
+    $argList = @()
+    $argList += $baseArgs
+    $argList += "--files-from=$txtFile"
+
+    # Start jpegoptim inside cmd.exe /k so window stays open after finishing
+    $proc = Start-Process -FilePath "cmd.exe" `
+        -ArgumentList "/k `"$exe $argList`"" `
+        -PassThru
+
+    # Record process info
+    $processes += [PSCustomObject]@{
+        Index = $i+1
+        PID   = $proc.Id
+        Files = $group.Count
+    }
+}
+
+Write-Host "Started $($processes.Count) jpegoptim processes:"
+$processes | Format-Table -AutoSize