core: Update GPU name string size

Modern CUDA releases use 256 characters.

Author: jngrad

src/core/cuda_init.hpp

@@ -34,7 +34,7 @@ struct EspressoGpuDevice {
   /** Local CUDA device id */
   int id;
   /** Local CUDA device name */
-  char name[64];
+  char name[256];
   /** Node identification */
   char proc_name[64];
   /** MPI process identification */
@@ -71,9 +71,9 @@ int cuda_check_gpu_compute_capability(int dev);
 /** Get the name of a CUDA device.
  *
  *  @param[in]  dev the CUDA device number to ask the name for
- *  @param[out] name a buffer to write the name to, at least 64 characters
+ *  @param[out] name a buffer to write the name to, at least 256 characters
  */
-void cuda_get_gpu_name(int dev, char name[64]);
+void cuda_get_gpu_name(int dev, char *name);
 
 /** Choose a device for future CUDA computations.
  *

src/core/cuda_init_cuda.cu

@@ -58,11 +58,20 @@ int cuda_check_gpu_compute_capability(int dev) {
   return ES_OK;
 }
 
-void cuda_get_gpu_name(int dev, char name[64]) {
+/**
+ * @brief Safely copy the device name and pad the string with null characters.
+ */
+static void cuda_copy_gpu_name(char *const name, cudaDeviceProp const &prop) {
+  char buffer[256] = {'\0'};
+  std::strncpy(buffer, prop.name, 256);
+  name[255] = '\0';
+  std::strncpy(name, buffer, 256);
+}
+
+void cuda_get_gpu_name(int dev, char *const name) {
   cudaDeviceProp deviceProp;
   CUDA_CHECK(cudaGetDeviceProperties(&deviceProp, dev))
-  std::strncpy(name, deviceProp.name, 63);
-  name[63] = 0;
+  cuda_copy_gpu_name(name, deviceProp);
 }
 
 EspressoGpuDevice cuda_get_device_props(const int dev) {
@@ -76,8 +85,7 @@ EspressoGpuDevice cuda_get_device_props(const int dev) {
                            deviceProp.minor,
                            deviceProp.totalGlobalMem,
                            deviceProp.multiProcessorCount};
-  std::strncpy(device.name, deviceProp.name, 64);
-  device.name[63] = '\0';
+  cuda_copy_gpu_name(device.name, deviceProp);
   return device;
 }
 

src/python/espressomd/cuda_init.pxd

@@ -22,7 +22,7 @@ from libcpp.vector cimport vector
 cdef extern from "cuda_init.hpp":
     cdef struct EspressoGpuDevice:
         int id
-        char name[64]
+        char name[256]
         char proc_name[64]
         int node
         int compute_capability_major
@@ -33,5 +33,5 @@ cdef extern from "cuda_init.hpp":
     void cuda_set_device(int dev) except +
     int cuda_get_device() except +
     int cuda_get_n_gpus() except +
-    void cuda_get_gpu_name(int dev, char name[64]) except +
+    void cuda_get_gpu_name(int dev, char * name) except +
     vector[EspressoGpuDevice] cuda_gather_gpus()

src/python/espressomd/cuda_init.pyx

@@ -63,7 +63,7 @@ cdef class CudaInitHandle:
                 List of available CUDA devices.
 
             """
-            cdef char gpu_name_buffer[4 + 64]
+            cdef char gpu_name_buffer[256]
             n_gpus = 0
             try:
                 n_gpus = cuda_get_n_gpus()