Skip checking of some settings in Cray OS (#739)

src/init.cc

@@ -106,17 +106,27 @@ static ncclResult_t ncclInit() {
     NCCLCHECK(ncclTopoGetStrFromSys("/proc/sys/kernel", "numa_balancing", strValue));
     if (strcmp(strValue, "1") == 0)
       WARN("NUMA auto balancing enabled which can lead to variability in the RCCL performance! Disable by \"sudo sysctl kernel.numa_balancing=0\"");
-    NCCLCHECK(ncclTopoGetStrFromSys("/sys/devices/virtual/dmi/id", "bios_version", strValue));
-    if (strncmp("Hyper-V UEFI Release", strValue, 20) != 0) {
-      NCCLCHECK(ncclTopoGetStrFromSys("/proc", "cmdline", strValue));
-      if (strstr(strValue, "amd_iommu=on") == NULL)
-        WARN("Missing \"amd_iommu=on\" from kernel command line which can lead to system instablity or hang!");
-      if (strstr(strValue, "iommu=pt") == NULL)
-        WARN("Missing \"iommu=pt\" from kernel command line which can lead to system instablity or hang!");
+    NCCLCHECK(ncclTopoGetStrFromSys("/proc", "version", strValue));
+    char *verStr, *state;
+    verStr = strtok_r(strValue, " ", &state);
+    for (int i = 0; i < 2; i ++) {
+      verStr = strtok_r(NULL, " ", &state);
+      if (verStr == NULL) break;
+    }
+    INFO(NCCL_INIT, "Kernel version: %s", verStr);
+    if (strstr(verStr, "cray") == NULL) {
+      NCCLCHECK(ncclTopoGetStrFromSys("/sys/devices/virtual/dmi/id", "bios_version", strValue));
+      if (strncmp("Hyper-V UEFI Release", strValue, 20) != 0) {
+        NCCLCHECK(ncclTopoGetStrFromSys("/proc", "cmdline", strValue));
+        if (strstr(strValue, "amd_iommu=on") == NULL)
+          WARN("Missing \"amd_iommu=on\" from kernel command line which can lead to system instablity or hang!");
+        if (strstr(strValue, "iommu=pt") == NULL)
+          WARN("Missing \"iommu=pt\" from kernel command line which can lead to system instablity or hang!");
+      }
+      char *env = getenv("HSA_FORCE_FINE_GRAIN_PCIE");
+      if (env == NULL || strcmp(env, "1") != 0)
+        WARN("Missing \"HSA_FORCE_FINE_GRAIN_PCIE=1\" from environment which can lead to low RCCL performance, system instablity or hang!");
     }
-    char *env = getenv("HSA_FORCE_FINE_GRAIN_PCIE");
-    if (env == NULL || strcmp(env, "1") != 0)
-      WARN("Missing \"HSA_FORCE_FINE_GRAIN_PCIE=1\" from environment which can lead to low RCCL performance, system instablity or hang!");
 #ifndef NVTX_NO_IMPL
     initNvtxRegisteredEnums();
 #endif