[GitHub] [tvm] junrushao1994 commented on a change in pull request #9044: [Meta Schedule][M3b] Builder

[GitBox <gi...@apache.org>]

junrushao1994 commented on a change in pull request #9044:
URL: https://github.com/apache/tvm/pull/9044#discussion_r711697560



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File path: python/tvm/meta_schedule/builder/local_builder.py
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@@ -0,0 +1,224 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+"""Local builder that compile on the local host"""
+import os
+import tempfile
+from typing import Callable, List, Optional
+
+from tvm._ffi import register_func
+from tvm.ir import IRModule
+from tvm.runtime import Module
+from tvm.target import Target
+
+from ...contrib.popen_pool import MapResult, PopenPoolExecutor, StatusKind
+from ..utils import cpu_count, get_global_func_with_default_on_worker
+from .builder import BuilderInput, BuilderResult, PyBuilder
+
+
+class LocalBuilder(PyBuilder):
+    """A builder that builds the given input on local host.
+
+    Parameters
+    ----------
+    pool : PopenPoolExecutor
+        The process pool to run the build.
+    timeout_sec : float
+        The timeout in seconds for the build.
+    f_build : Optional[str]
+        Name of the build function to be used.
+        Defaults to `meta_schedule.builder.default_build`.
+        The signature is Callable[[IRModule, Target], Module].
+    f_export : Optional[str]
+        Name of the export function to be used.
+        Defaults to `meta_schedule.builder.default_export`.
+        The signature is Callable[[Module], str].
+
+    Note
+    ----
+    The build function and export function should be registered in the worker process.
+    The worker process is only aware of functions registered in TVM package,
+    if there are extra functions to be registered,
+    please send the registration logic via initializer.
+    """
+
+    pool: PopenPoolExecutor
+    timeout_sec: float
+    f_build: Optional[str]
+    f_export: Optional[str]
+
+    def __init__(
+        self,
+        *,
+        max_workers: Optional[int] = None,
+        timeout_sec: float = 30.0,
+        f_build: str = None,
+        f_export: str = None,
+        initializer: Optional[Callable[[], None]] = None,
+    ) -> None:
+        """Constructor.
+
+        Parameters
+        ----------
+        max_workers : Optional[int]
+            The maximum number of worker processes to be used.
+            Defaults to number of CPUs.
+        timeout_sec : float
+            The timeout in seconds for the build.
+        f_build : Optional[str]
+            Name of the build function to be used.
+            Defaults to `meta_schedule.builder.default_build`.
+            The signature is Callable[[IRModule, Target], Module].
+        f_export : Optional[str]
+            Name of the export function to be used.
+            Defaults to `meta_schedule.builder.default_export`.
+            The signature is Callable[[Module], str].
+        initializer : Optional[Callable[[], None]]
+            The initializer to be used for the worker processes.
+        """
+        super().__init__()
+
+        if max_workers is None:
+            max_workers = cpu_count()

Review comment:
       This is good point. I imagine the main process will be stalled and waiting for the workers, so is it fine to use `cpu_count`? Let me know what you think




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