TL/CUDA: check devices

Author: Sergei-Lebedev

src/components/tl/cuda/tl_cuda.h

@@ -142,7 +142,6 @@ typedef struct ucc_tl_cuda_sync {
     ucc_tl_cuda_mem_info_t mem_info_src;
     ucc_tl_cuda_mem_info_t mem_info_dst;
     cudaEvent_t            ipc_event_local;
-    cudaIpcEventHandle_t   ev_handle;
     union {
         struct {
             size_t sbytes[UCC_TL_CUDA_MAX_PEERS];

src/components/tl/cuda/tl_cuda_coll.h

@@ -20,7 +20,7 @@ extern const char
 #define UCC_TL_CUDA_CHECK_DEVICE_MATCH(_team) do {                             \
     int _dev;                                                                  \
     CUDA_CHECK(cudaGetDevice(&_dev));                                          \
-    if (_dev != (_team)->device) {                                             \
+    if (((_team)->device != -1) && _dev != (_team)->device) {                  \
         tl_error(UCC_TL_TEAM_LIB(_team), "CUDA device mismatch, "              \
                  "current device %d, team device %d\n", _dev,                  \
                  (_team)->device);                                             \

src/components/tl/cuda/tl_cuda_team.c

@@ -38,13 +38,17 @@ ucc_status_t ucc_tl_cuda_comm_init_post(ucc_tl_cuda_team_t *team)
     if (cu_ctx == NULL || cu_st != CUDA_SUCCESS) {
         tl_debug(tl_lib,
                  "cannot create CUDA TL team without active CUDA context");
-        return UCC_ERR_NO_RESOURCE;
+        team->device_id = TL_CUDA_DEVICE_INVALID;
+        team->state     = TL_CUDA_STATE_ERROR;
+        goto exchnage_rank_ids;
     }
 
     status = CUDA_FUNC(cudaGetDevice(&team->device));
     if (status != UCC_OK) {
         tl_debug(tl_lib, "failed to get current device id");
-        return status;
+        team->device_id = TL_CUDA_DEVICE_INVALID;
+        team->state     = TL_CUDA_STATE_ERROR;
+        goto exchnage_rank_ids;
     }
 
     status = ucc_tl_cuda_topo_get_pci_id(team->device, &team->device_id);
@@ -88,6 +92,7 @@ ucc_status_t ucc_tl_cuda_comm_init_post(ucc_tl_cuda_team_t *team)
         goto free_scratch;
     }
 
+exchnage_rank_ids:
     rank_id->pci_id = team->device_id;
     status = team->oob.allgather(rank_id, team->ids, rank_id_size,
                                  team->oob.coll_info, &team->oob_req);
@@ -127,6 +132,17 @@ ucc_status_t ucc_tl_cuda_comm_init_test(ucc_tl_cuda_team_t *team)
         return status;
     }
     team->oob.req_free(team->oob_req);
+    /* check all ranks have valid CUDA device set */
+    for (r = 0; r < tsize; r++) {
+        rank_id = GET_RANK_ID(team->ids, r, max_concurrent);
+        if (ucc_tl_cuda_topo_device_id_equal(&rank_id->pci_id,
+                                             &TL_CUDA_DEVICE_INVALID)) {
+            tl_debug(tl_lib, "rank %d device is invalid, team can't be created",
+                     r);
+            team->state = TL_CUDA_STATE_ERROR;
+            return UCC_ERR_NO_RESOURCE;
+        }
+    }
 
     status = ucc_tl_cuda_team_topo_create(&team->super, &team->topo);
     if (status != UCC_OK) {
@@ -234,6 +250,7 @@ UCC_CLASS_INIT_FUNC(ucc_tl_cuda_team_t, ucc_base_context_t *tl_context,
     self->stream      = NULL;
     self->topo        = NULL;
     self->scratch.loc = NULL;
+    self->device      = -1;
 
     if (!ucc_team_map_is_single_node(params->team, params->map)) {
         tl_debug(tl_context->lib, "multinode team is not supported");

src/components/tl/cuda/tl_cuda_topo.c

@@ -25,6 +25,13 @@ pthread_mutex_t nvml_lock = PTHREAD_MUTEX_INITIALIZER;
         }                                                                      \
     } while (0)
 
+const ucc_tl_cuda_device_pci_id_t TL_CUDA_DEVICE_INVALID = {
+    .domain   = 0xFFFF,
+    .bus      = 0xFF,
+    .device   = 0xFF,
+    .function = 0xFF,
+};
+
 static ucc_status_t
 ucc_tl_cuda_topo_pci_id_from_str(const char * bus_id_str,
                                  ucc_tl_cuda_device_pci_id_t *pci_id)

src/components/tl/cuda/tl_cuda_topo.h

@@ -19,6 +19,8 @@ typedef struct ucc_tl_cuda_device_id {
     uint8_t  function; /* range: 0 to 7 */
 } ucc_tl_cuda_device_pci_id_t;
 
+extern const ucc_tl_cuda_device_pci_id_t TL_CUDA_DEVICE_INVALID;
+
 typedef enum ucc_tl_cuda_topo_dev_type {
     UCC_TL_CUDA_TOPO_DEV_TYPE_GPU,
     UCC_TL_CUDA_TOPO_DEV_TYPE_SWITCH,