Disable Colltrace for --fast option (#778)

* Disable Colltrace for --fast option

* Limit nprocs for CI

[ROCm/rccl commit: 0c77c66221]

projects/rccl/src/enqueue.cc

@@ -28,11 +28,18 @@ struct ncclKernelMatch {
 };
 
 typedef void(*ncclKern_t)(struct ncclDevComm* comm, uint64_t channelMask, struct ncclWork* workHead);
+
 // Must be consistent with the ncclFuncSet enum
+#ifdef ENABLE_COLLTRACE
 static ncclKernelMatch const ncclKerns[2] = {
   {(void *)NCCL_KERN_NAME(SendRecv, RING, SIMPLE, Sum, int8_t), true},
   {(void *)NCCL_KERN_NAME_DEBUG(SendRecv, RING, SIMPLE, Sum, int8_t), true},
 };
+#else
+static ncclKernelMatch const ncclKerns[1] = {
+  {(void*)NCCL_KERN_NAME(SendRecv, RING, SIMPLE, Sum, int8_t), true}
+};
+#endif
 
 static ncclResult_t computeColl(struct ncclInfo* info /* input */, int* workFuncIndex, struct ncclWorkElem* work, struct ncclProxyOp* proxyOp /* output */);