Answers.Body: <p>I am almost certain that the <code>localmem</code> parameter is the issue here. CellRanger uses STAR aligner under the hood which is resource-hungry. We usually allocate 18 cores and at least 40GB of RAM to CellRanger while disabling all of its secondary analysis, such as clustering and tSNE. Five GB of RAM for sure are not sufficient.</p>
  
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Answers.CreationDate: 2024-08-12T15:01:31.360Z
Answers.Text: I have to use upwards of 100GB to ensure things *definitely* run to completion.
Answers.UserDisplayName: Ram RS
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Answers.CreationDate: 2024-08-12T15:16:01.433Z
Answers.Text: @RamRS I just checked some older logs and we routinely use 18 cores and 40GB of RAM, but disabling all these secondary analysis CR can do (like tSNE etc). Still takes several hours to complete, but it usually works just fine.
Answers.UserDisplayName: ATpoint
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Answers.CreationDate: 2024-08-12T19:46:04.400Z
Answers.Text: We also use 40 GB RAM when running STAR with the human or mouse genome for regular RNA-Seq. It might be able to do with less memory if the parameters are tweaked, but that may not be possible when it's evoked through CellRanger.
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Body: <p>I run the cellranger count with this code:</p>
  <pre><code>cellranger count \
    --id=run_count_SRR11537950 \
    --transcriptome=refdata-gex-GRCh38-2024-A \
    --create-bam=true \
    --fastqs=SRR11537950 \
    --sample=SRR11537950 \
    --chemistry=fiveprime \
    --localcores=1 \
    --localmem=5
  </code></pre>
  <p>and error showed:</p>
  <pre><code>[error] Pipestance failed. Error log at: run_count_SRR11537950/SC_RNA_COUNTER_CS/SC_MULTI_CORE/MULTI_GEM_WELL_PROCESSOR/COUNT_GEM_WELL_PROCESSOR/_BASIC_SC_RNA_COUNTER/_MATRIX_COMPUTER/ALIGN_AND_COUNT/fork0/chnk0-u0de8b9d2e0/_errors
  Log message: Job failed in stage code
  signal: killed
  </code></pre>
  <p>What should I do? Thanks in advance!</p>
  
Tags: <scrnaseq>
Title: Cellranger count error chnk
ThreadText: # Cellranger count error chnk
  
  (Asked by: username_0 on 2024-08-12)
  
  I run the cellranger count with this code:
  
  ```
  cellranger count \
    --id=run_count_SRR11537950 \
    --transcriptome=refdata-gex-GRCh38-2024-A \
    --create-bam=true \
    --fastqs=SRR11537950 \
    --sample=SRR11537950 \
    --chemistry=fiveprime \
    --localcores=1 \
    --localmem=5
  
  ```
  
  and error showed:
  
  ```
  [error] Pipestance failed. Error log at: run_count_SRR11537950/SC_RNA_COUNTER_CS/SC_MULTI_CORE/MULTI_GEM_WELL_PROCESSOR/COUNT_GEM_WELL_PROCESSOR/_BASIC_SC_RNA_COUNTER/_MATRIX_COMPUTER/ALIGN_AND_COUNT/fork0/chnk0-u0de8b9d2e0/_errors
  Log message: Job failed in stage code
  signal: killed
  
  ```
  
  What should I do? Thanks in advance!
  
  **Tags:** scrnaseq
  
  
  ---
  
  ## 1 answers
  
  ### Answer by username_1 on 2024-08-12. Score: 2
  
  I am almost certain that the `localmem` parameter is the issue here. CellRanger uses STAR aligner under the hood which is resource-hungry. We usually allocate 18 cores and at least 40GB of RAM to CellRanger while disabling all of its secondary analysis, such as clustering and tSNE. Five GB of RAM for sure are not sufficient.
  
  > **Comments:**
  > **username_2**: I have to use upwards of 100GB to ensure things *definitely* run to completion.  
  > **username_1**: @username_2 I just checked some older logs and we routinely use 18 cores and 40GB of RAM, but disabling all these secondary analysis CR can do (like tSNE etc). Still takes several hours to complete, but it usually works just fine.  
  > **username_3**: We also use 40 GB RAM when running STAR with the human or mouse genome for regular RNA-Seq. It might be able to do with less memory if the parameters are tweaked, but that may not be possible when it's evoked through CellRanger.  
  
  ---
  
  