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[FDConfig] Reduce FD_CUSTOM_AR_MAX_SIZE_MB default from 64 to 8 (#6997)

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Most single-GPU and small-model deployments do not need 64MB custom
all-reduce buffers. Lowering the default to 8MB reduces unnecessary
shared memory allocation. Tests that require larger buffers now
explicitly set the value.

Co-authored-by: gongweibao <gognweibao@baidu.com>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
gongweibao
2026-03-25 17:40:01 +08:00
committed by GitHub
parent 7a6c28781b
commit 48cfb608aa
2 changed files with 3 additions and 3 deletions
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tests/e2e/4cards_cases/test_determinism_long.py
+1 -1
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@@ -143,7 +143,7 @@ def _module_env():
{
"CUDA_VISIBLE_DEVICES": os.environ.get("CUDA_VISIBLE_DEVICES", "0,1,2,3"),
"FD_DETERMINISTIC_MODE": "1",
"FD_CUSTOM_AR_MAX_SIZE_MB": os.environ.get("FD_CUSTOM_AR_MAX_SIZE_MB", "57"),
"FD_CUSTOM_AR_MAX_SIZE_MB": os.environ.get("FD_CUSTOM_AR_MAX_SIZE_MB", "64"),
"FLAGS_max_partition_size": _CHUNK_SIZE_FOR_TEST,
}
):