set task_topology_max_group to cpu_count (#1594)

by default. Can be overriden with a flag of the same str

shark/iree_utils/compile_utils.py

@@ -14,6 +14,7 @@
 import iree.runtime as ireert
 import iree.compiler as ireec
 from shark.iree_utils._common import iree_device_map, iree_target_map
+from shark.iree_utils.cpu_utils import get_iree_cpu_rt_args
 from shark.iree_utils.benchmark_utils import *
 from shark.parser import shark_args
 import numpy as np
@@ -352,6 +353,12 @@ def load_vmfb_using_mmap(
         config = ireert.Config(device=haldevice)
     else:
         config = get_iree_runtime_config(device)
+    if "task" in device:
+        print(
+            f"[DEBUG] setting iree runtime flags for cpu:\n{' '.join(get_iree_cpu_rt_args())}"
+        )
+        for flag in get_iree_cpu_rt_args():
+            ireert.flags.parse_flags(flag)
     # Now load vmfb.
     # Two scenarios we have here :-
     #      1. We either have the vmfb already saved and therefore pass the path of it.
@@ -359,7 +366,6 @@ def load_vmfb_using_mmap(
     #   OR 2. We are compiling on the fly, therefore we have the flatbuffer blob to play with.
     #         (This would arise if we're invoking `compile` from a SharkInference obj)
     temp_file_to_unlink = None
-
     if isinstance(flatbuffer_blob_or_path, Path):
         flatbuffer_blob_or_path = flatbuffer_blob_or_path.__str__()
     if (

shark/iree_utils/cpu_utils.py

@@ -16,6 +16,7 @@
 
 import subprocess
 import platform
+from shark.parser import shark_args
 
 
 def get_cpu_count():
@@ -44,4 +45,18 @@ def get_iree_cpu_args():
         error_message = f"OS Type f{os_name} not supported and triple can't be determined, open issue to dSHARK team please :)"
         raise Exception(error_message)
     print(f"Target triple found:{target_triple}")
-    return [f"--iree-llvmcpu-target-triple={target_triple}"]
+    return [
+        f"--iree-llvmcpu-target-triple={target_triple}",
+    ]
+
+
+# Get iree runtime flags for cpu
+def get_iree_cpu_rt_args():
+    default = get_cpu_count()
+    default = default if default <= 8 else default - 2
+    cpu_count = (
+        default
+        if shark_args.task_topology_max_group_count is None
+        else shark_args.task_topology_max_group_count
+    )
+    return [f"--task_topology_max_group_count={cpu_count}"]

shark/parser.py

@@ -119,5 +119,11 @@ parser.add_argument(
     "to augment the base device allocator",
     choices=["debug", "caching"],
 )
+parser.add_argument(
+    "--task_topology_max_group_count",
+    type=str,
+    default=None,
+    help="passthrough flag for the iree flag of the same name. If None, defaults to cpu-count",
+)
 
 shark_args, unknown = parser.parse_known_args()