}
}
+ // final balance
+
+ const double exec_ms = try_run (device_param, kernel_accel, kernel_loops, 1);
+
+ e_best = exec_ms;
+
+ u32 kernel_accel_try = kernel_accel;
+ u32 kernel_loops_try = kernel_loops;
+
+ for (int i = 0; i < 2; i++)
+ {
+ kernel_accel_try >>= 1;
+ kernel_loops_try <<= 1;
+
+ if (kernel_accel_try < kernel_accel_min) break;
+ if (kernel_loops_try > kernel_loops_max) break;
+
+ const double exec_ms = try_run (device_param, kernel_accel_try, kernel_loops_try, 1);
+
+ if (exec_ms > e_best) break;
+
+ kernel_accel = kernel_accel_try;
+ kernel_loops = kernel_loops_try;
+
+ e_best = exec_ms;
+ }
+
+ kernel_accel_try = kernel_accel;
+ kernel_loops_try = kernel_loops;
+
+ for (int i = 0; i < 2; i++)
+ {
+ kernel_accel_try <<= 1;
+ kernel_loops_try >>= 1;
+
+ if (kernel_accel_try > kernel_accel_max) break;
+ if (kernel_loops_try < kernel_loops_min) break;
+
+ const double exec_ms = try_run (device_param, kernel_accel_try, kernel_loops_try, 1);
+
+ if (exec_ms > e_best) break;
+
+ kernel_accel = kernel_accel_try;
+ kernel_loops = kernel_loops_try;
+
+ e_best = exec_ms;
+ }
+
// reset timer
device_param->exec_pos = 0;