Expose call to change which core a model is running on via JNI

src/main/java/org/photonvision/rknn/RknnJNI.java

@@ -84,6 +84,15 @@ public boolean equals(Object obj) {
      * @return Pointer to the detector in native memory
      */
     public static native long create(String modelPath, int numClasses, int modelVer, int coreNum);
+
+    /**
+     * Given an already running detector, change the bitmask controlling which
+     * of the 3 cores the model is running on
+     * @param ptr Pointer to detector in native memory
+     * @param desiredCore Which of the three cores to operate on
+     * @return return code of rknn_set_core_mask call, indicating success or failure
+     */
+    public static native int setCoreMask(long ptr, int desiredCore);
 
     /**
      * Delete all native resources assocated with a detector

src/main/native/cpp/rknn_jni.cpp

@@ -77,6 +77,15 @@ Java_org_photonvision_rknn_RknnJNI_create
   return reinterpret_cast<jlong>(ret);
 }
 
+JNIEXPORT jint JNICALL Java_org_photonvision_rknn_RknnJNI_setCoreMask(JNIEnv *env,
+                                                                  jclass,
+                                                                  jlong ptr,
+                                                                  jint coreMask)
+{
+  YoloModel *yolo = reinterpret_cast<YoloModel *>(ptr);
+  return yolo->changeCoreMask(coreMask);
+}
+
 /*
  * Class:     org_photonvision_rknn_RknnJNI
  * Method:    destroy

src/main/native/cpp/rknn_jni.h

@@ -35,6 +35,12 @@ JNIEXPORT jlong JNICALL Java_org_photonvision_rknn_RknnJNI_create(JNIEnv *,
                                                                   jstring,
                                                                   jint, jint, jint);
 
+
+JNIEXPORT jint JNICALL Java_org_photonvision_rknn_RknnJNI_setCoreMask(JNIEnv *,
+                                                                  jclass,
+                                                                  jlong,
+                                                                  jint);
+
 /*
  * Class:     org_photonvision_rknn_RknnJNI
  * Method:    destroy

src/main/native/cpp/yolo_common.cpp

@@ -82,37 +82,8 @@ YoloModel::YoloModel(std::string modelPath, int num_classes_, ModelVersion type_
         throw std::runtime_error("rknn_init error ret=" + ret);
     }
 
-    // 设置模型绑定的核心/Set the core of the model that needs to be bound
-    rknn_core_mask core_mask;
-    switch (coreNumber)
-    {
-    case -1:
-        core_mask = RKNN_NPU_CORE_AUTO;
-        break;
-    case 0:
-        core_mask = RKNN_NPU_CORE_0;
-        break;
-    case 1:
-        core_mask = RKNN_NPU_CORE_1;
-        break;
-    case 2:
-        core_mask = RKNN_NPU_CORE_2;
-        break;
-    case 10:
-        core_mask = RKNN_NPU_CORE_0_1;
-        break;
-    case 210:
-        core_mask = RKNN_NPU_CORE_0_1_2;
-        break;
-    default:
-        throw std::runtime_error("invalid core selection! core selected: " + coreNumber);
-        break;
-    }
-    ret = rknn_set_core_mask(ctx, core_mask);
-    if (ret < 0)
-    {
-        throw std::runtime_error("rknn_init core error ret=" + ret);
-    }
+    // hard coded to let npu decide where the model runs
+    this->changeCoreMask(coreNumber);
 
     rknn_sdk_version version;
     ret = rknn_query(ctx, RKNN_QUERY_SDK_VERSION, &version, sizeof(rknn_sdk_version));
@@ -204,6 +175,40 @@ YoloModel::~YoloModel() {
         free(model_data);
 }
 
+int YoloModel::changeCoreMask(int coreNumber) {
+        // 设置模型绑定的核心/Set the core of the model that needs to be bound
+    rknn_core_mask core_mask;
+    switch (coreNumber)
+    {
+    case -1:
+        core_mask = RKNN_NPU_CORE_AUTO;
+        break;
+    case 0:
+        core_mask = RKNN_NPU_CORE_0;
+        break;
+    case 1:
+        core_mask = RKNN_NPU_CORE_1;
+        break;
+    case 2:
+        core_mask = RKNN_NPU_CORE_2;
+        break;
+    case 10:
+        core_mask = RKNN_NPU_CORE_0_1;
+        break;
+    case 210:
+        core_mask = RKNN_NPU_CORE_0_1_2;
+        break;
+    default:
+        throw std::runtime_error("invalid core selection! core selected: " + coreNumber);
+        break;
+    }
+    int ret = rknn_set_core_mask(ctx, core_mask);
+    if (ret < 0)
+    {
+        throw std::runtime_error("rknn_init core error ret=" + ret);
+    }
+    return ret;
+}
 
 detect_result_group_t YoloModel::forward(cv::Mat &orig_img, DetectionFilterParams params) {
     cv::Mat img;

src/main/native/include/yolo_common.hpp

@@ -19,6 +19,8 @@ class YoloModel {
 public:
     YoloModel(std::string modelPath, int num_classes_, ModelVersion type_, int coreNumber);
 
+    int changeCoreMask(int coreNumber);
+
     detect_result_group_t forward(cv::Mat &orig_img, DetectionFilterParams params);
 
     ~YoloModel();

src/test/java/org/photonvision/rknn/RknnTest.java

@@ -55,18 +55,26 @@ public void testBasicBlobs() {
 
 
         System.out.println("Loading bus");
-        Mat img = Imgcodecs.imread("silly_notes2.png");
+        Mat img = Imgcodecs.imread("silly_notes.png");
+        Mat img2 = Imgcodecs.imread("silly_notes2.png");
 
         System.out.println("Loading rknn-jni");
         System.load("/home/coolpi/rknn_jni/cmake_build/librknn_jni.so");
 
-        System.out.println("Creating detector");
-        long ptr = RknnJNI.create("/home/coolpi/rknn_jni/note-640-640-yolov5s.rknn", 1, ModelVersion.YOLO_V5.ordinal(), 0);
+        System.out.println("Creating detector on three cores");
+        long ptr = RknnJNI.create("/home/coolpi/rknn_jni/note-640-640-yolov5s.rknn", 1, ModelVersion.YOLO_V5.ordinal(), 210);
 
         System.out.println("Running detector");
         var ret = RknnJNI.detect(ptr, img.getNativeObjAddr(), .45, .25);
         System.out.println(Arrays.toString(ret));
 
+        System.out.println("Changing detector to run on core 0");
+        System.out.println("return code: " + RknnJNI.setCoreMask(ptr, 0));
+
+        System.out.println("Running detector again");
+        ret = RknnJNI.detect(ptr, img2.getNativeObjAddr(), .45, .25);
+        System.out.println(Arrays.toString(ret));
+
         System.out.println("Killing detector");
         RknnJNI.destroy(ptr);
     }