From 4e538747133b92ddfb2ead1933f389a6176d6806 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marek=20Lema=C5=84czyk?= <marek@lemanczyk.eu>
Date: Thu, 11 Sep 2025 02:09:40 +0200
Subject: [PATCH] Add post-copy synchronization for residue GPU scan

---
 PerfectNumbers.Core/Gpu/MersenneNumberResidueGpuTester.cs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/PerfectNumbers.Core/Gpu/MersenneNumberResidueGpuTester.cs b/PerfectNumbers.Core/Gpu/MersenneNumberResidueGpuTester.cs
index 781a143..13fa81d 100644
--- a/PerfectNumbers.Core/Gpu/MersenneNumberResidueGpuTester.cs
+++ b/PerfectNumbers.Core/Gpu/MersenneNumberResidueGpuTester.cs
@@ -58,6 +58,7 @@ public class MersenneNumberResidueGpuTester(bool useGpuOrder)
 
                                 accelerator.Synchronize();
                                 orderBuffer.View.CopyToCPU(ref MemoryMarshal.GetReference(orders), currentSize);
+                                accelerator.Synchronize();
                                 if (!Volatile.Read(ref isPrime))
                                 {
                                         break;