Bismark Extract failed always ran out of memory after 8hrs.

[RachaelAjayi]

Bismark_mapping Failed, Run time 08:18:26, OUT_OF_MEMORY.

Please see code
bismark --genome_folder genomes/bismark -o bam/ --non_directional --parallel 8 --score_min L,-0.6,-0.6 -1 trimmed/${base1}_val_1.fq.gz -2 trimmed/${base2}_val_2.fq.gz

What am I doing wrong? I am running on a cluster using 16 nodes for the job submission.

[FelixKrueger]

Assuming the human genome, and easy to work numbers, a single run of Bismark requires ~3 cores (at 100%) and ~14GB of RAM for a standard directional run, and 5 cores and ~20GB of RAM for a non directional run. Since you used --parallel 8 you need to roughly multiply these values with 2, meaning the run would be in the region of roghly 40 cores and up to 160GB. If you don't have that much, the job will be killed using due to a OUT_OF_MEMORY error.

Does that make sense?

[RachaelAjayi]

Thank you.

[RachaelAjayi]

Thank you so much for your reply.

New Error: 2- bowtie2-align died with signal 9 (KILL)
(ERR): bowtie2-align died with signal 9 (KILL)

[FelixKrueger]

That still sounds like memory issues, what did you change?
Can you google (ERR): bowtie2-align died with signal 9 (KILL)?