Send parallel #1139

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opened 2026-02-20 17:43:13 -05:00 by yindo · 1 comment
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Originally created by @wangsiyu666 on GitHub (Feb 6, 2026).

Checked other resources

  • This is a bug, not a usage question.
  • I added a clear and descriptive title that summarizes this issue.
  • I used the GitHub search to find a similar question and didn't find it.
  • I am sure that this is a bug in LangGraph rather than my code.
  • The bug is not resolved by updating to the latest stable version of LangGraph (or the specific integration package).
  • This is not related to the langchain-community package.
  • I posted a self-contained, minimal, reproducible example. A maintainer can copy it and run it AS IS.

Reproduction Steps / Example Code (Python)

Does using Send to distribute tasks in langgraph achieve parallel scheduling? If a node internally performs I/O operations, is gathering still necessary to truly achieve parallelism?

Error Message and Stack Trace (if applicable)

Does using Send to distribute tasks in langgraph achieve parallel scheduling? If a node internally performs I/O operations, is gathering still necessary to truly achieve parallelism?

Description

Does using Send to distribute tasks in langgraph achieve parallel scheduling? If a node internally performs I/O operations, is gathering still necessary to truly achieve parallelism?

System Info

Does using Send to distribute tasks in langgraph achieve parallel scheduling? If a node internally performs I/O operations, is gathering still necessary to truly achieve parallelism?

Originally created by @wangsiyu666 on GitHub (Feb 6, 2026). ### Checked other resources - [x] This is a bug, not a usage question. - [x] I added a clear and descriptive title that summarizes this issue. - [x] I used the GitHub search to find a similar question and didn't find it. - [x] I am sure that this is a bug in LangGraph rather than my code. - [x] The bug is not resolved by updating to the latest stable version of LangGraph (or the specific integration package). - [x] This is not related to the langchain-community package. - [x] I posted a self-contained, minimal, reproducible example. A maintainer can copy it and run it AS IS. ### Reproduction Steps / Example Code (Python) ```python Does using Send to distribute tasks in langgraph achieve parallel scheduling? If a node internally performs I/O operations, is gathering still necessary to truly achieve parallelism? ``` ### Error Message and Stack Trace (if applicable) ```shell Does using Send to distribute tasks in langgraph achieve parallel scheduling? If a node internally performs I/O operations, is gathering still necessary to truly achieve parallelism? ``` ### Description Does using Send to distribute tasks in langgraph achieve parallel scheduling? If a node internally performs I/O operations, is gathering still necessary to truly achieve parallelism? ### System Info Does using Send to distribute tasks in langgraph achieve parallel scheduling? If a node internally performs I/O operations, is gathering still necessary to truly achieve parallelism?
yindo added the bug label 2026-02-20 17:43:13 -05:00
yindo closed this issue 2026-02-20 17:43:13 -05:00
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@hinthornw commented on GitHub (Feb 6, 2026):

Yes it is parallel.

https://docs.langchain.com/oss/python/langchain/multi-agent/router-knowledge-base#parallel-execution-with-send

Why did you mark this question as a bug?

@hinthornw commented on GitHub (Feb 6, 2026): Yes it is parallel. https://docs.langchain.com/oss/python/langchain/multi-agent/router-knowledge-base#parallel-execution-with-send Why did you mark this question as a bug?
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Reference: langchain-ai/langgraph#1139