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Match JDownloader 2 extraction behavior: normal I/O, -mt2 hybrid
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- Remove setWindowsBackgroundIO entirely (JD2 uses normal I/O priority)
- Keep only CPU priority IDLE (os.setPriority)
- Hybrid threads fixed at -mt2 (matches JD2's ~16 MB/s controlled throughput)
- Final extraction uses full thread count (unchanged)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Sucukdeluxe 2026-03-03 01:14:47 +01:00
parent 9a646d516b
commit 3ee3af03cf
2 changed files with 12 additions and 33 deletions
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2
package.json
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@ -1,6 +1,6 @@
{
"name": "real-debrid-downloader",
"version": "1.5.41",
"version": "1.5.42",
"description": "Real-Debrid Downloader Desktop (Electron + React + TypeScript)",
"main": "build/main/main/main.js",
"author": "Sucukdeluxe",

43
src/main/extractor.ts
View File

@ -471,9 +471,10 @@ function extractCpuBudgetPercent(): number {
function extractorThreadSwitch(hybridMode = false): string {
if (hybridMode) {
const cpuCount = Math.max(1, os.cpus().length || 1);
const hybridThreads = Math.max(1, Math.min(8, Math.floor(cpuCount / 2)));
return `-mt${hybridThreads}`;
// 2 threads during hybrid extraction (download + extract simultaneously).
// JDownloader 2 uses in-process 7-Zip-JBinding which naturally limits throughput
// to ~16 MB/s write. 2 UnRAR threads produce similar controlled disk load.
return "-mt2";
}
const envValue = Number(process.env.RD_EXTRACT_THREADS ?? NaN);
if (Number.isFinite(envValue) && envValue >= 1 && envValue <= 32) {
@ -486,25 +487,7 @@ function extractorThreadSwitch(hybridMode = false): string {
return `-mt${threadCount}`;
}
function setWindowsBackgroundIO(pid: number): void {
if (process.platform !== "win32") {
return;
}
// NtSetInformationProcess: set I/O priority to Very Low (0) and Page priority to Very Low (1).
// IDLE_PRIORITY_CLASS (set by os.setPriority) only lowers CPU scheduling priority;
// it does NOT lower I/O priority on modern Windows (Vista+). This call does.
const script = `$c=@'\nusing System;using System.Runtime.InteropServices;\npublic class P{[DllImport("ntdll.dll")]static extern int NtSetInformationProcess(IntPtr h,int c,ref int d,int s);[DllImport("kernel32.dll")]static extern IntPtr OpenProcess(int a,bool i,int p);[DllImport("kernel32.dll")]static extern bool CloseHandle(IntPtr h);public static void S(int pid){IntPtr h=OpenProcess(0x0600,false,pid);if(h==IntPtr.Zero)return;int v=0;NtSetInformationProcess(h,0x21,ref v,4);v=1;NtSetInformationProcess(h,0x27,ref v,4);CloseHandle(h);}}\n'@\nAdd-Type -TypeDefinition $c;[P]::S(${pid})`;
try {
spawn("powershell.exe", ["-NoProfile", "-NonInteractive", "-ExecutionPolicy", "Bypass", "-Command", script], {
windowsHide: true,
stdio: "ignore"
}).unref();
} catch {
// best-effort: powershell may not be available
}
}
function lowerExtractProcessPriority(childPid: number | undefined, lowIo = false): void {
function lowerExtractProcessPriority(childPid: number | undefined): void {
if (process.platform !== "win32") {
return;
}
@ -513,15 +496,12 @@ function lowerExtractProcessPriority(childPid: number | undefined, lowIo = false
return;
}
try {
// IDLE_PRIORITY_CLASS: lowers CPU scheduling priority only
// IDLE_PRIORITY_CLASS: lowers CPU scheduling priority so extraction
// doesn't starve other processes. I/O priority stays Normal (like JDownloader 2).
os.setPriority(pid, os.constants.priority.PRIORITY_LOW);
} catch {
// ignore: priority lowering is best-effort
}
// Lower I/O + page priority only in hybrid mode (download + extract simultaneously)
if (lowIo) {
setWindowsBackgroundIO(pid);
}
}
type ExtractSpawnResult = {
@ -578,8 +558,7 @@ function runExtractCommand(
args: string[],
onChunk?: (chunk: string) => void,
signal?: AbortSignal,
timeoutMs?: number,
hybridMode = false
timeoutMs?: number
): Promise<ExtractSpawnResult> {
if (signal?.aborted) {
return Promise.resolve({ ok: false, missingCommand: false, aborted: true, timedOut: false, errorText: "aborted:extract" });
@ -589,7 +568,7 @@ function runExtractCommand(
let settled = false;
let output = "";
const child = spawn(command, args, { windowsHide: true });
lowerExtractProcessPriority(child.pid, hybridMode);
lowerExtractProcessPriority(child.pid);
let timeoutId: NodeJS.Timeout | null = null;
let timedOutByWatchdog = false;
let abortedBySignal = false;
@ -846,7 +825,7 @@ async function runExternalExtractInner(
}
bestPercent = parsed;
onArchiveProgress?.(bestPercent);
}, signal, timeoutMs, hybridMode);
}, signal, timeoutMs);
if (!result.ok && usePerformanceFlags && isUnsupportedExtractorSwitchError(result.errorText)) {
usePerformanceFlags = false;
@ -860,7 +839,7 @@ async function runExternalExtractInner(
}
bestPercent = parsed;
onArchiveProgress?.(bestPercent);
}, signal, timeoutMs, hybridMode);
}, signal, timeoutMs);
}
if (result.ok) {