nextflow-io / nextflow-io/nextflow

Slurm oom-kill due to memory is ignored.

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executor/slurm stale
Dominant language
Groovy
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Forks
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Avg merge
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Merged PRs (30d)
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Description

Bug report

Expected behavior and actual behavior

Slurm jobs that run out of memory get oom-killed. In nearly all cases this works. In an awk process i run there is excessive RAM usage that gets only logged in .command.log but is ignored in the nextflow process. This results in premature end of the awk processes leading to corrupted output.

Steps to reproduce the problem

The following code produces issues with fastq.gz files with 20 million reads or more.

process count_reads {

    label "count_reads"

    publishDir path: "${params.analysesdir}/${stage}/${sample}/", pattern: "*.csv", mode: "copy"

    // SLURM cluster options
    cpus 1
    memory "5 GB"
    time "1h"

    tag "readcount_${sample}"

    input:
        tuple val(sample), path(reads)
        val(stage)
        
    output:
        tuple val(sample), path("${sample}_read_count.csv"), emit: read_count
        
    script:
        """
            zless ${reads[0]} | awk 'END {printf "%s", "${sample},"; printf "%.0f", NR/4; print ""}' > ${sample}_read_count.csv

        """

    stub:
        """
            mkdir -p ${sample}
            touch ${sample}_read_count.csv
        """
}
Program output

In the nextflow.log the jobs look as if they are successful.

$ cat .command.log
slurmstepd-hpc-...: error: Detected 1 oom_kill event in StepId=71xxxxx.batch. Some of the step tasks have been OOM Killed.
Environment
  • Nextflow version: 24.04.2
  • Java version: openjdk 21-internal 2023-09-19
  • Operating system: Linux
  • Bash version: GNU bash, version 5.0.17(1)-release (x86_64-pc-linux-gnu)
Additional context

(Add any other context about the problem here)

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Reproduce the Slurm-backed process with the provided Nextflow example and inspect nextflow.log alongside .command.log, focusing on how the OOM-kill is reported. Done when an OOM-killed awk process is treated as failed rather than successful and its output is not accepted as valid.

Written by the indexing model from the issue text.

Assessment

Tech stack
awk, bash, groovy, linux
Domain
devops, hpc
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
42/100

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