philres / ngmlr

NGMLR is a long-read mapper designed to align PacBio or Oxford Nanopore (standard and ultra-long) to a reference genome with a focus on reads that span structural variations

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segmentation fault using ngmlr 0.2.7

lentil824 opened this issue · comments

Hi there,

I installed precompiled ngmlr 0.2.7, copied the demo command for Nanopore run, and replaced with my own ref.fa and whole genome seq.fastq.gz files. It immediately gave "segmentation fault" error.

I don't have permission type issue (#26), and ngmlr version not the old one (#10). I even zcat the gz file, copied the ref.fa to the current dir, none was working. Always the same error. Did I miss something?

Thanks,
Susan

Hi Susan,
I have also just installed this version of ngmlr
and am experiencing the same issues - I was just wondering if you have made any progress or have moved to another approach in the meantime?

Regards
Chris

Hi Chris,

Sorry for the late reply! Unfortunately I couldn't figure this out and didn't get a reply from the developer, so I switched to other mappers (https://github.com/lh3/minimap2 and https://github.com/marbl/Winnowmap). Both minimap2 and winnowmap are easy to install and use, so you can give them a try.

Regards,
Susan

Sorry guys for the super late reply. Can you describe a bit more about the error that you see and the output that you get from NGMLR running on the command line ?
Thanks
Fritz

That should not happen like that..
I would suggest that maybe if you can take the test data from this repo and run it with that once . Like e.g. test1 should show you if you get it there or not.

Thx
Fritz

Thanks . Feel free to keep me posted.
Fritz

Hi Fritz,

Thanks for the suggestion! The same error "segmentation fault" appeared when using test_1 data and precompiled ngmlr 0.2.7. I noticed Chris was using ngmlr 0.2.8 build, so decided to build ngmlr from source. Surprisingly, ngmlr 0.2.8 build from source worked well with test_1 data and my own data (still running so far with my large data file). So, now I think there might be some issues with the precompiled version, but I will leave this to you.

Regards,
Susan

Btw, Chris, I have ONT data in fasta. So it is pretty straightforward by adding -x ont. Your data is a bit complicated from what you described. With the help from Fritz, I am sure you will get it sorted out.

Regards,
Susan

Thanks Susan!
Fritz