[autoparallel] Add experimental config to enable autoparallel_asynctp

stack-info: PR: #1772, branch: IvanKobzarev/stack/2

Author: IvanKobzarev

torchtitan/config/job_config.py

@@ -739,6 +739,9 @@ class Experimental:
 
     enable_simplefsdp_passes: bool = False
 
+    enable_autoparallel_asynctp: bool = False
+
+
 @dataclass
 class Validation:
     enable: bool = False

torchtitan/experiments/auto_parallel/parallelize_llama.py

@@ -10,7 +10,6 @@
 
 from autoparallel.api import AutoParallel
 
-from torch.distributed import DeviceMesh
 from torch.distributed.fsdp import MixedPrecisionPolicy
 from torch.distributed.tensor.placement_types import Replicate, Shard
 
@@ -33,6 +32,7 @@ def parallelize_llama(
     the model must fit on GPU or CPU memory.
     """
     world_mesh = parallel_dims.world_mesh
+
     def input_fn():
         global_batch_size = job_config.training.global_batch_size
         if global_batch_size < 0:
@@ -62,6 +62,27 @@ def input_fn():
         lambda bucket_idx: 1000 / parallel_dims.tp
     )
 
+    if job_config.experimental.enable_autoparallel_asynctp:
+        from torch.distributed._symmetric_memory import enable_symm_mem_for_group
+
+        assert "tp" in world_mesh.mesh_dim_names
+        enable_symm_mem_for_group(world_mesh["tp"].get_group().group_name)
+        torch._inductor.config._micro_pipeline_tp = False
+        # Disable inductor AsyncTP passes, in favor of using Autoparallel passes fork.
+        from autoparallel.asynctp import micro_pipeline_tp_pass
+
+        existing_post_grad_custom_post_pass = (
+            torch._inductor.config.post_grad_custom_post_pass
+        )
+
+        def _pass(graph):
+            if existing_post_grad_custom_post_pass is not None:
+                existing_post_grad_custom_post_pass(graph)
+
+            micro_pipeline_tp_pass(graph, None)
+
+        torch._inductor.config.post_grad_custom_post_pass = _pass
+
     # bail out
     # model = model_fn()
     # return model
@@ -78,6 +99,7 @@ def input_fn():
         world_mesh,
         mp_policy=mp_policy,
         compile=job_config.compile,
+        repeated_subgraphs=True,
     ) as autop:
         autop.add_parameter_memory_constraint(low=None, high=None)
 
@@ -101,7 +123,8 @@ def input_fn():
         )
         out_sharding = x_sharding
         loss_parallel_enabled = (
-            parallel_dims.tp_enabled and not job_config.parallelism.disable_loss_parallel
+            parallel_dims.tp_enabled
+            and not job_config.parallelism.disable_loss_parallel
         )
         if loss_parallel_enabled:
             out_sharding = tuple(