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ci: Repeat func tests, save logs of unit tests and lessen debug output#3089

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ko3n1g merged 11 commits into
NVIDIA:mainfrom
ko3n1g:ko3n1g/ci/repeat-func-tests
Jan 27, 2026
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ci: Repeat func tests, save logs of unit tests and lessen debug output#3089
ko3n1g merged 11 commits into
NVIDIA:mainfrom
ko3n1g:ko3n1g/ci/repeat-func-tests

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@ko3n1g

@ko3n1g ko3n1g commented Jan 27, 2026

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What does this PR do ?

⚠️ For major changes (either in lines of code or in its impact), please make sure to first share a design doc with the team. If you're unsure what's the best way to do so, contact the @mcore-oncall.

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flowchart LR
    A[Pre-checks] --> B[PR Tests]
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        C1[Expert Review] --> C2[Final Review]
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  • I want this PR in a versioned release and have added the appropriate Milestone (e.g., Core 0.8)
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Signed-off-by: oliver könig <okoenig@nvidia.com>
@ko3n1g ko3n1g requested a review from a team as a code owner January 27, 2026 00:01
@ko3n1g ko3n1g added this to the Core 0.16 milestone Jan 27, 2026
@ko3n1g ko3n1g requested a review from a team January 27, 2026 00:02
Signed-off-by: oliver könig <okoenig@nvidia.com>
Signed-off-by: oliver könig <okoenig@nvidia.com>
Signed-off-by: oliver könig <okoenig@nvidia.com>
@ko3n1g

ko3n1g commented Jan 27, 2026

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/ok to test 358e3e9

f
Signed-off-by: oliver könig <okoenig@nvidia.com>
@ko3n1g ko3n1g force-pushed the ko3n1g/ci/repeat-func-tests branch from 358e3e9 to d3e34ea Compare January 27, 2026 00:56
Signed-off-by: oliver könig <okoenig@nvidia.com>
@ko3n1g ko3n1g changed the title ci: N_REPEAT ci: Repeat func tests, save logs of unit tests and lessen debug output Jan 27, 2026

@chtruong814 chtruong814 left a comment

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Thanks for this. Only had questions to understand better.

else
ARGS=(
--scope mr-github-slim
--n-repeat 5

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Roughly speaking, how much does this add to the CI time for one of those jobs?

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Around 15-20min per job.

"N_REPEAT": "1",
"N_REPEAT": str(n_repeat),
"CLUSTER": "dgxh100_dgxc",
"NCCL_DEBUG": "INFO",

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What would show up when we encounter the random nccl failures again?

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Let me try if we can find a middle ground by using NCCL_DEBUG_FILE.

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We send NCCL debug now to file which we can later download from the job outputs

Signed-off-by: oliver könig <okoenig@nvidia.com>
@ko3n1g ko3n1g merged commit dea21a0 into NVIDIA:main Jan 27, 2026
39 checks passed
ko3n1g added a commit to ko3n1g/Megatron-LM that referenced this pull request Jan 28, 2026
daiyaanarfeen pushed a commit to daiyaanarfeen/Megatron-LM that referenced this pull request Feb 23, 2026
yangbofun pushed a commit to xlm-research/Megatron-LM that referenced this pull request May 22, 2026
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2 participants