Switch to use new colltrace by default

Summary: As the new colltrace comes close to functionality compared to old colltrace, switch to use new CollTrace by default. A following diff will also enable CollTrace by default. The old colltrace will be deleted in 2.28.

Reviewed By: SuhitK

Differential Revision: D84476753

fbshipit-source-id: 5b8ba6783d923dded66cdb43723ad66622d6b07f

Author: YulunW

comms/utils/cvars/nccl_cvars.cc

@@ -1,5 +1,5 @@
 // Copyright (c) Meta Platforms, Inc. and affiliates.
-// @generated SignedSource<<9faa9aa79e5e364340862b443258445f2a79d5fb>>
+// @generated SignedSource<<ac94e136092e7333fa672ce200679405c62d835a>>
 // Automatically generated by ./comms/utils/cvars/extractcvars.py --- START
 // DO NOT EDIT!!!
 
@@ -2310,9 +2310,9 @@ static void readCvarEnv() {
         "NCCL_COLLTRACE_TRACE_CUDA_GRAPH");
   }
   NCCL_COLLTRACE_USE_NEW_COLLTRACE =
-      env2bool("NCCL_COLLTRACE_USE_NEW_COLLTRACE", "False");
+      env2bool("NCCL_COLLTRACE_USE_NEW_COLLTRACE", "True");
   NCCL_COLLTRACE_USE_NEW_COLLTRACE_DEFAULT =
-      env2bool("NCCL_ENV_DO_NOT_SET", "False");
+      env2bool("NCCL_ENV_DO_NOT_SET", "True");
 
   if (NCCL_COLLTRACE_USE_NEW_COLLTRACE_DEFAULT !=
       NCCL_COLLTRACE_USE_NEW_COLLTRACE) {

comms/utils/cvars/nccl_cvars.h

@@ -1,5 +1,5 @@
 // Copyright (c) Meta Platforms, Inc. and affiliates.
-// @generated SignedSource<<9faa9aa79e5e364340862b443258445f2a79d5fb>>
+// @generated SignedSource<<ac94e136092e7333fa672ce200679405c62d835a>>
 // Automatically generated by ./comms/utils/cvars/extractcvars.py --- START
 // DO NOT EDIT!!!
 

comms/utils/cvars/nccl_cvars.yaml

@@ -2104,7 +2104,7 @@ cvars:
 
  - name        : NCCL_COLLTRACE_USE_NEW_COLLTRACE
    type        : bool
-   default     : false
+   default     : true
    description : |-
      Use new colltrace implementation. This is a temporary flag to enable
      new colltrace implementation. We will remove this flag once the new