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perf: Scale read stream workers to cpu count #2135

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merged 1 commit into from
Oct 6, 2025
+8 −3
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perf: Scale read stream workers to cpu count #2135

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11 changes: 8 additions & 3 deletions bigframes/session/bq_caching_executor.py
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Original file line number Diff line number Diff line change
Expand Up @@ -15,6 +15,7 @@
from __future__ import annotations

import math
import os
import threading
from typing import Literal, Mapping, Optional, Sequence, Tuple
import warnings
Expand Down Expand Up @@ -58,7 +59,7 @@
MAX_SUBTREE_FACTORINGS = 5
_MAX_CLUSTER_COLUMNS = 4
MAX_SMALL_RESULT_BYTES = 10 * 1024 * 1024 * 1024 # 10G

_MAX_READ_STREAMS = os.cpu_count()

SourceIdMapping = Mapping[str, str]

Expand Down Expand Up @@ -323,7 +324,10 @@ def _export_gbq(
self.bqclient.update_table(table, ["schema"])

return executor.ExecuteResult(
row_iter.to_arrow_iterable(),
row_iter.to_arrow_iterable(
bqstorage_client=self.bqstoragereadclient,
max_stream_count=_MAX_READ_STREAMS,
),
array_value.schema,
query_job,
total_bytes_processed=row_iter.total_bytes_processed,
Expand Down Expand Up @@ -668,7 +672,8 @@ def _execute_plan_gbq(

return executor.ExecuteResult(
_arrow_batches=iterator.to_arrow_iterable(
bqstorage_client=self.bqstoragereadclient
bqstorage_client=self.bqstoragereadclient,
max_stream_count=_MAX_READ_STREAMS,
),
schema=og_schema,
query_job=query_job,
Expand Down