Better alternating between video cards

src/opencl.c

@@ -2,6 +2,9 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <time.h>
+#include <unistd.h>
+
 
 cl_info cl = {0};
 
@@ -12,17 +15,23 @@ void check_error(cl_info info)
     }
 }
 
+#define MAX_DEVICES 10
+
 cl_info cl_init()
 {
     cl_info info;
     info.initialized = 0;
-    //cl_uint num_platforms, num_devices;
+    cl_uint num_platforms, num_devices;
     // Fetch the Platform and Device IDs; we only want one.
-    cl_device_id devices[2];
-    info.error=clGetPlatformIDs(1, &info.platform, 0);
+    cl_device_id devices[MAX_DEVICES];
+    info.error=clGetPlatformIDs(1, &info.platform, &num_platforms);
     check_error(info);
-    info.error=clGetDeviceIDs(info.platform, CL_DEVICE_TYPE_ALL, 2, devices, 0);
-    info.device = devices[rand()%2];
+    info.error=clGetDeviceIDs(info.platform, CL_DEVICE_TYPE_ALL, MAX_DEVICES, devices, &num_devices);
+    if(num_devices > MAX_DEVICES) num_devices = MAX_DEVICES;
+    int index = getpid()%num_devices;
+    printf("%d rand, %d devices, %d index\n", getpid(), num_devices, index);
+    info.device = devices[index];
+    fprintf(stderr, "Found %d device(s)\n", num_devices);
     check_error(info);
 
     cl_context_properties properties[]={

src/tests.c

@@ -672,8 +672,6 @@ void features_VOC_image(char *image_file, char *image_dir, char *out_dir, int fl
 	if (flip)sprintf(out_path, "%s%d/%s_r.txt",out_dir, interval, image_file);
 	else sprintf(out_path, "%s%d/%s.txt",out_dir, interval, image_file);
 	printf("%s\n", image_file);
-	FILE *fp = fopen(out_path, "w");
-	if(fp == 0) file_error(out_path);
 
 	IplImage* src = 0;
 	if( (src = cvLoadImage(image_path,-1)) == 0 ) file_error(image_path);
@@ -709,6 +707,8 @@ void features_VOC_image(char *image_file, char *image_dir, char *out_dir, int fl
 			ims[j+interval] = features_output_size(net, src, ex_h, ex_w);
 		}
 	}
+	FILE *fp = fopen(out_path, "w");
+	if(fp == 0) file_error(out_path);
 	for(i = 0; i < max_scale+interval; ++i){
 		image out = ims[i];
 		fprintf(fp, "%d, %d, %d\n",out.c, out.h, out.w);