message->tag = request->tag;
message->buf = xbt_malloc(request->datatype->size * request->count);
memcpy(message->buf, request->buf, request->datatype->size * request->count);
message->tag = request->tag;
message->buf = xbt_malloc(request->datatype->size * request->count);
memcpy(message->buf, request->buf, request->datatype->size * request->count);