[Graph Partition] fix partition x memory plan issue #165514
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🔗 Helpful Links🧪 See artifacts and rendered test results at hud.pytorch.org/pr/165514
Note: Links to docs will display an error until the docs builds have been completed. ✅ You can merge normally! (1 Unrelated Failure)As of commit 821d8bf with merge base b4fd471 ( FLAKY - The following job failed but was likely due to flakiness present on trunk:
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ProExpertProg
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eellison
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Merge startedYour change will be merged once all checks pass (ETA 0-4 Hours). Learn more about merging in the wiki. Questions? Feedback? Please reach out to the PyTorch DevX Team |
Chao1Han
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For `test_graph_partition_with_memory_plan_reuse`, before this PR, when using graph partition, it would error ([P1992728479](https://www.internalfb.com/phabricator/paste/view/P1992728479)): ``` def partition_0(args): ... del buf0 return (buf3, buf4, buf5, buf2, primals_4, ) ... File "/tmp/torchinductor_boyuan/ww/cwwc7ukfqscg2vy6ankby2fizdb377tvgyx3fwdgddrxe3g47jg6.py", line 132, in partition_0 return (buf3, buf4, buf5, buf2, primals_4, ) ^^^^ NameError: name 'buf2' is not defined. Did you mean: 'buf0'? ``` When not using graph partition, it would work and give the following code ([P1992997521](https://www.internalfb.com/phabricator/paste/view/P1992997521)): ``` def call(self, args): ... buf2 = buf0; del buf0 # reuse ... ``` Note that the issue is buf0 is not reused for buf2 when using graph partition. Why? Because the codegen runs `run_wrapper_ir_passes` and `memory_plan_reuse`, which pops tailing `MemoryPlanningLine` unless it is in graph output by checking `V.graph.get_output_names()`. However, for graph partition, we should check the output of the current partition instead of the graph before partition. Pull Request resolved: pytorch#165514 Approved by: https://github.com/ProExpertProg, https://github.com/eellison
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@pytorchbot cherry-pick --onto release/2.9 --fixes "Inductor partition introduced in 2.9.0 breaking vllm (vllm-project/vllm#26878)" -c fixnewfeature |
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For `test_graph_partition_with_memory_plan_reuse`, before this PR, when using graph partition, it would error ([P1992728479](https://www.internalfb.com/phabricator/paste/view/P1992728479)): ``` def partition_0(args): ... del buf0 return (buf3, buf4, buf5, buf2, primals_4, ) ... File "/tmp/torchinductor_boyuan/ww/cwwc7ukfqscg2vy6ankby2fizdb377tvgyx3fwdgddrxe3g47jg6.py", line 132, in partition_0 return (buf3, buf4, buf5, buf2, primals_4, ) ^^^^ NameError: name 'buf2' is not defined. Did you mean: 'buf0'? ``` When not using graph partition, it would work and give the following code ([P1992997521](https://www.internalfb.com/phabricator/paste/view/P1992997521)): ``` def call(self, args): ... buf2 = buf0; del buf0 # reuse ... ``` Note that the issue is buf0 is not reused for buf2 when using graph partition. Why? Because the codegen runs `run_wrapper_ir_passes` and `memory_plan_reuse`, which pops tailing `MemoryPlanningLine` unless it is in graph output by checking `V.graph.get_output_names()`. However, for graph partition, we should check the output of the current partition instead of the graph before partition. Pull Request resolved: #165514 Approved by: https://github.com/ProExpertProg, https://github.com/eellison (cherry picked from commit f071f17)
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Cherry picking #165514The cherry pick PR is at #166984 and it is linked with issue Inductor partition introduced in 2.9.0 breaking vllm (vllm-project/vllm#26878). The following tracker issues are updated: Details for Dev Infra teamRaised by workflow job |
atalman
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Nov 5, 2025
[Graph Partition] fix partition x memory plan issue (#165514) For `test_graph_partition_with_memory_plan_reuse`, before this PR, when using graph partition, it would error ([P1992728479](https://www.internalfb.com/phabricator/paste/view/P1992728479)): ``` def partition_0(args): ... del buf0 return (buf3, buf4, buf5, buf2, primals_4, ) ... File "/tmp/torchinductor_boyuan/ww/cwwc7ukfqscg2vy6ankby2fizdb377tvgyx3fwdgddrxe3g47jg6.py", line 132, in partition_0 return (buf3, buf4, buf5, buf2, primals_4, ) ^^^^ NameError: name 'buf2' is not defined. Did you mean: 'buf0'? ``` When not using graph partition, it would work and give the following code ([P1992997521](https://www.internalfb.com/phabricator/paste/view/P1992997521)): ``` def call(self, args): ... buf2 = buf0; del buf0 # reuse ... ``` Note that the issue is buf0 is not reused for buf2 when using graph partition. Why? Because the codegen runs `run_wrapper_ir_passes` and `memory_plan_reuse`, which pops tailing `MemoryPlanningLine` unless it is in graph output by checking `V.graph.get_output_names()`. However, for graph partition, we should check the output of the current partition instead of the graph before partition. Pull Request resolved: #165514 Approved by: https://github.com/ProExpertProg, https://github.com/eellison (cherry picked from commit f071f17) Co-authored-by: Boyuan Feng <boyuan@meta.com>
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For
test_graph_partition_with_memory_plan_reuse, before this PR, when using graph partition, it would error (P1992728479):When not using graph partition, it would work and give the following code (P1992997521):
Note that the issue is buf0 is not reused for buf2 when using graph partition.
Why? Because the codegen runs
run_wrapper_ir_passesandmemory_plan_reuse, which pops tailingMemoryPlanningLineunless it is in graph output by checkingV.graph.get_output_names(). However, for graph partition, we should check the output of the current partition instead of the graph before partition.cc @voznesenskym @penguinwu @EikanWang @jgong5 @Guobing-Chen @XiaobingSuper @zhuhaozhe @blzheng @wenzhe-nrv @jiayisunx @ipiszy @chenyang78 @kadeng @muchulee8 @amjames @chauhang @aakhundov @coconutruben