diff --git a/SAFT_TOFI/src/SAFT_TOFI.cpp b/SAFT_TOFI/src/SAFT_TOFI.cpp
index 5ebd929..e05c486 100644
--- a/SAFT_TOFI/src/SAFT_TOFI.cpp
+++ b/SAFT_TOFI/src/SAFT_TOFI.cpp
@@ -340,8 +340,10 @@ void multithreaded_processing(float *aScan_ptr,    ///< AScan-Daten
     SPDLOG_INFO("Start GPU execute!");
 
     for (j = 0; j < num_devices_factor; j++)
+    // for (j = 0; j < 1; j++)
     {
         for (k = 0; k < selectedNumberGPUs; k++)
+        // for (k = 0; k < 1; k++)
         {
             // new async threads
             futures[k] = std::async(std::forward<std::function<void(void *)>>(thread_function),
@@ -350,6 +352,7 @@ void multithreaded_processing(float *aScan_ptr,    ///< AScan-Daten
 
         // Synchronization and termination -------------------------------------------------------------------------------------------------------------------
         for (k = 0; k < selectedNumberGPUs; k++)
+        // for (k = 0; k < 1; k++)
         {
             // new async threads
             futures[k].wait();  // advantage: async are packaged tasks after c++ with os handling, and consistency handling (if destructor is called, it executes task)
diff --git a/SAFT_TOFI/src/kernel/saftPrivate.cu b/SAFT_TOFI/src/kernel/saftPrivate.cu
index 6fa33c5..23823bb 100644
--- a/SAFT_TOFI/src/kernel/saftPrivate.cu
+++ b/SAFT_TOFI/src/kernel/saftPrivate.cu
@@ -2,6 +2,9 @@
 #include "rayTracing.cuh"
 #include "saftKernel.cuh"
 #include "saft.hpp"
+// #include "spdlog/spdlog.h"
+
+#define SPDLOG_INFO(...)  
 
 void SAFTHandler::precalculateAscanIndex_usePaths(int ascanIndex_i, int aScanWindowSize, int currentSpeedOfSoundZLayer, int maxFeasibleSosZLayerCount)
 {
@@ -546,6 +549,7 @@ void SAFTHandler::performSAFT(
             CUDA_CHECK(cudaBindTextureToArray(&texTableAscanIndexFloat2_3, deviceTextureAscanIndexFloatCuArray[3], &texChannelDescTableAscanIndexFloat));
         }
     }
+    SPDLOG_INFO("performSAFT init end");
     // Vorberechnung der Koordinaten --> schnelleres Bestimmen der Voxelposition
     float VoxelIncrement = IMAGE_RESOLUTION / SOS_RESOLUTION;
     float3 SosVoxelStartPosition;
@@ -564,6 +568,10 @@ void SAFTHandler::performSAFT(
     // ==================================================== Blockmode with SOS-value per Ascan
     // ==================================================== 3DVolume Mode with SOS-Correction no ATT-Correction
     // ==================================================== 3DVolume Mode with SOS- and ATT-Correction
+    SPDLOG_INFO("perform kernel start");
+    SPDLOG_INFO("SosVoxelStartPosition {0} {1} {2}",SosVoxelStartPosition.x,SosVoxelStartPosition.y,SosVoxelStartPosition.z);
+    SPDLOG_INFO("TableAscanIndexAllocationCount = ({0}/{1}) = {2} = {3}", aScanWindowSize, maxAscanIndexArraysInTexture, TableAscanIndexAllocationCount,
+    ceil(aScanWindowSize/maxAscanIndexArraysInTexture));
 
     if ((SOSMode_3DVolume == false) && (ATTMode_3DVolume == false))
     {  // ==================================================== Blockmode with SOS-value per Ascan
@@ -571,6 +579,7 @@ void SAFTHandler::performSAFT(
     }
     else if ((SOSMode_3DVolume == true) && (ATTMode_3DVolume == false))
     {  
+        SPDLOG_INFO("perform kernel saftKernelAscanIndex_SOS");
 		// ==================================================== 3DVolume Mode with SOS-Correction no ATT-Correction
         saftKernelAscanIndex_SOS<<<reducedGridDimensions, reducedBlockDimensions>>>(  // , 0, stream>>>(
 
@@ -579,11 +588,13 @@ void SAFTHandler::performSAFT(
             (float)aScanWindowSize,          // maxAscanIndexArraysInTexture
             maxAscanIndexArraysInTexture,    //  maxSoSReceiverArrayForTexture
             TableAscanIndexAllocationCount,  // Anzahl der genutzten Teiltabellen
-            IMAGE_SIZE_XYZ, SosVoxelStartPosition, IMAGE_RESOLUTION, VoxelIncrement, blockIndexOffset, speedOfSoundZLayer, gridDimensions, blockDimensions, deviceOutput);
+         IMAGE_SIZE_XYZ, SosVoxelStartPosition, IMAGE_RESOLUTION, VoxelIncrement, blockIndexOffset, speedOfSoundZLayer, gridDimensions, blockDimensions, deviceOutput);
+        SPDLOG_INFO("perform kernel saftKernelAscanIndex_SOS finish");
+    
     }
     else if ((SOSMode_3DVolume == true) && (ATTMode_3DVolume == true))
     {  // ==================================================== 3DVolume Mode with SOS- and ATT-Correction
-
+        SPDLOG_INFO("perform kernel saftKernelAscanIndex_SOS_ATT, grid:{0},{1},{2}",reducedGridDimensions.x,reducedGridDimensions.y, reducedGridDimensions.z);
         saftKernelAscanIndex_SOS_ATT<<<reducedGridDimensions, reducedBlockDimensions>>>(  // , 0, stream>>>(
             aScanIndex,
             (float)aScanWindowSize,          // maxAscanIndexArraysInTexture
@@ -595,7 +606,11 @@ void SAFTHandler::performSAFT(
             deviceOutput
 
         );
+        SPDLOG_INFO("perform kernel saftKernelAscanIndex_SOS_ATT finish");
     }
+    SPDLOG_INFO("perform kernel finish");
+
+    SPDLOG_INFO("perform unbind start");
 
     // Unbind Textures
     CUDA_CHECK(cudaUnbindTexture(&texRefAscans));
@@ -615,4 +630,5 @@ void SAFTHandler::performSAFT(
         CUDA_CHECK(cudaUnbindTexture(&texTableAscanIndexFloat2_3));
     }
     CUDA_CHECK(cudaGetLastError());
+    SPDLOG_INFO("perform unbind finish");
 }
\ No newline at end of file
diff --git a/SAFT_TOFI/src/processAScans.cpp b/SAFT_TOFI/src/processAScans.cpp
index 741b549..e26a60c 100644
--- a/SAFT_TOFI/src/processAScans.cpp
+++ b/SAFT_TOFI/src/processAScans.cpp
@@ -9,6 +9,8 @@
 #include <iostream>
 
 #include "saft.hpp"
+// #include "spdlog/spdlog.h"
+#define SPDLOG_INFO(...)  
 
 extern float3 *constEmitterPtr;
 extern float3 *constReceiverPtr;
@@ -24,6 +26,7 @@ extern unsigned short *constLookUpGeometryMemoryListReceiverPtr;
 */
 void SAFTHandler::performCoreReconstruction()
 {
+    // SPDLOG_INFO("performCoreReconstruction start!");
     // Mitlaufender Zeiger fuer Speicherbereich der Outputdaten uebergeben.
     double *currentHostOutputAdress = output;  // Offset des OutputSpeichers am Anfang = 0
     CUDA_CHECK(cudaGetLastError());
@@ -76,7 +79,7 @@ void SAFTHandler::performCoreReconstruction()
     }
 
     currentZLayerCount = maxFeasibleZLayerCount;  // Mit maximal moeglicher Anzahl an Z-Layer rechnen und in Schleife abhaengig von Randbedingungen auf aktuelle maximale Anzahl verringern
-
+    SPDLOG_INFO("main loop start!GPUMemoryFree:{0}",memoryGPUfreeInGiga());
     // performCoreReconstruction - While-Loop over all Z-Layers~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     while ((zOffset < IMAGE_SIZE_XYZ.z))
@@ -129,19 +132,25 @@ void SAFTHandler::performCoreReconstruction()
             zSoSOffset_old = zSoSOffset;
             // SoS-Pfade für Z-Layer vorberechnen ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
+            SPDLOG_INFO("precalculateAverageSpeedOfSound Emitter start!GPUMemoryFree:{0}",memoryGPUfreeInGiga());
+
             // Emitter ----------------------------------------------------------------------- Emitter
             precalculateAverageSpeedOfSound(currentSpeedOfSoundZLayer, maxFeasibleSosZLayerCount, 0, emitter_list_Size);
+            SPDLOG_INFO("precalculateAverageSpeedOfSound Emitter finish!GPUMemoryFree:{0}",memoryGPUfreeInGiga());
 
+            SPDLOG_INFO("precalculateAverageSpeedOfSound Receiver start!GPUMemoryFree:{0}",memoryGPUfreeInGiga());
             // Receiver -----------------------------------------------------------------------  Receiver
 
             precalculateAverageSpeedOfSound(currentSpeedOfSoundZLayer, maxFeasibleSosZLayerCount, 1, receiver_list_Size);
+            SPDLOG_INFO("precalculateAverageSpeedOfSound finish!GPUMemoryFree:{0}",memoryGPUfreeInGiga());
+
         }
         // Go overall A-Scanblocks  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
         // PrecalAndPerformSAFTAllAscans - Berechne Performanz fuer Durchlauf von allen Ascans ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
         // aScanWindowSize auf maximal moegliche Anzahl setzen
         std::size_t aScanWindowSize = (maxAscanIndexArraysInTexture * maxSupportedTexturesForAscanIndex);  // Anzahl maximaler Ascans die auf einmal verarbeitet werden kann.
-
+        
         int ascanIndexBatchOffset = 0;
         while (ascanIndexBatchOffset < aScanCount)
         {  // Alle Emitter oder Receiver in der Liste von Matlab durchgehen
@@ -160,15 +169,27 @@ void SAFTHandler::performCoreReconstruction()
             // neededAscanBatchCount						=  Anzahl an benoetigten Durchlaeufen des SAFTs um alle Ascans abarbeiten zu koennen
 
             // AscanIndex Emitter -> Voxel --> Receiver vorberechnen fuer AscansBatchSize
-            precalculateAscanIndex_usePaths(ascanIndexBatchOffset, aScanWindowSize, currentSpeedOfSoundZLayer, maxFeasibleSosZLayerCount);  //, deviceTextureAscanIndexFloatCuArray);
+            SPDLOG_INFO("precalculateAscanIndex_usePaths start!GPUMemoryFree:{0}",memoryGPUfreeInGiga());
 
+            precalculateAscanIndex_usePaths(ascanIndexBatchOffset, aScanWindowSize, currentSpeedOfSoundZLayer, maxFeasibleSosZLayerCount);  //, deviceTextureAscanIndexFloatCuArray);
+            SPDLOG_INFO("precalculateAscanIndex_usePaths finish!GPUMemoryFree:{0}",memoryGPUfreeInGiga());
+            // if (copyed){
+            //     // SPDLOG_INFO("cudaStreamSynchronize start!");
+            //     cudaStreamSynchronize(stream);
+            //     // SPDLOG_INFO("cudaStreamSynchronize finish!");
+
+            // }
             /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
             /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
             if (currentZLayerCount > 0)  // bugprevention because windows and linux would stop execution for a bug - Issue 100
+            {
+                SPDLOG_INFO("performSAFT start!GPUMemoryFree:{0}",memoryGPUfreeInGiga());
                 performSAFT(ascanIndexBatchOffset, aScanWindowSize, IMAGE_SIZE_XYZ, SOSGrid_XYZ, blockIndexOffset, static_cast<int>(currentOutputZLayerVoxelCount),
                             static_cast<int>(currentSpeedOfSoundZLayer), static_cast<int>(partialSpeedOfSoundVoxelCount), static_cast<int>(maxFeasibleSosZLayerCount),
                             static_cast<int>(currentEmIndexUsedForAscanIndexCalculation), windowGridDimensions, genericSAFTGridDimensions, genericSAFTBlockDimensions, deviceSpeedOfSoundField,
                             deviceAScansCuArray[0]);
+                SPDLOG_INFO("performSAFT finish!GPUMemoryFree:{0}",memoryGPUfreeInGiga());
+            }
             // , calculationStream);
             ascanIndexBatchOffset += aScanWindowSize;
 
@@ -212,6 +233,7 @@ void SAFTHandler::performCoreReconstruction()
         currentZLayerCount = maxFeasibleZLayerCount;
     };  // End While-Loop over all Z-Layer
     // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+    SPDLOG_INFO("main loop finish!GPUMemoryFree:{0}",memoryGPUfreeInGiga());
 }
 
 /**
diff --git a/SAFT_TOFI/src/saft.cpp b/SAFT_TOFI/src/saft.cpp
index 262153e..d2ce245 100644
--- a/SAFT_TOFI/src/saft.cpp
+++ b/SAFT_TOFI/src/saft.cpp
@@ -223,6 +223,9 @@ std::size_t memoryGPUfree()
     CUDA_CHECK(cudaMemGetInfo(&freeMemory, &totalMemory));
     return freeMemory;
 }
+float memoryGPUfreeInGiga(){
+    return (float)memoryGPUfree()/(1024.f*1025.f*1024.f);
+}
 
 /**
    Determine free memory available on the current device.
diff --git a/SAFT_TOFI/src/saft.hpp b/SAFT_TOFI/src/saft.hpp
index 8b620b6..e54788b 100644
--- a/SAFT_TOFI/src/saft.hpp
+++ b/SAFT_TOFI/src/saft.hpp
@@ -397,6 +397,7 @@ class SAFTHandler
 
 extern void memoryCheck();
 extern std::size_t memoryGPUfree();
+extern float memoryGPUfreeInGiga();
 extern std::size_t memoryGPUtotal();
 
 extern void performCUDAResultCheck(cudaError_t result, std::string const &file, int line);