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JOJ3 itself will be killed due to OOM when copyOut files are large #86

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opened 2025-04-29 21:29:32 +08:00 by 张泊明518370910136 · 2 comments
张泊明518370910136 commented 2025-04-29 21:29:32 +08:00
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As described in https://docs.goj.ac/design#memory-usage, it should be fine when /dev/shm has 8G and memory has 16G on joj-dev. But in practice, 100 cases of 1M copy out stdout & stderr will cause JOJ3 oom.

As described in https://docs.goj.ac/design#memory-usage, it should be fine when /dev/shm has 8G and memory has 16G on joj-dev. But in practice, 100 cases of 1M copy out stdout & stderr will cause JOJ3 oom.
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张泊明518370910136 commented 2025-04-30 07:43:39 +08:00
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It relates to running JOJ3 in act_runner. Run JOJ3 directly on joj-dev will not cause OOM but inside act_runner it will.

It relates to running JOJ3 in act_runner. Run JOJ3 directly on joj-dev will not cause OOM but inside act_runner it will.
张泊明518370910136 commented 2025-05-09 16:38:55 +08:00
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Fixed in 07cbf29792. os/exec in golang does not fork the process, so rlimit will be applied to the current parent process. Check https://www.reddit.com/r/golang/comments/inpsqv/how_to_limit_memory_usage_in_a_child_process/.

Fixed in 07cbf29792438217952a6c834c84baa05169cfaf. `os/exec` in golang does not fork the process, so rlimit will be applied to the current parent process. Check https://www.reddit.com/r/golang/comments/inpsqv/how_to_limit_memory_usage_in_a_child_process/.
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Reference: JOJ/JOJ3#86
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