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Cufflinks: Long time for assembly-"Waiting for 1 thread to complete"

I have been trying assembling RNA-seq reads with cufflinks with the following options:

cufflinks -p 8 -o output -g gtf.file --max-bundle-frags 1000000000000 --multi-read-correct acctpted.bam

It has been running for past 7 days and showing "Waiting for 1 thread to complete".

However, if I remove the -g option, it completes in 36 hours. Does anybody face a similar situation?

What could be the possible solution?

assembly rna-seq
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updated by Ram Ram • written by mjoyraj mjoyraj

which organism are you assembling? is your gtf file correct? you want to leave the gtf file where it is (option -g) because that's the reference you are using.

I'm not sure why you are using that --max-bundle-frags number...do you really need it so high? I'd try leaving the default setting

also, I haven't used it in awhile but the -p should indicate multiple thread, are you using them correctly? if you are i.e. on a server you might have to talk to your IT ppl to make sure that the setting that you are using in cufflinks are not in contrast with what's actually happening once you launch it on that server.

7 days is definitely too much, not sure which computer/server you are using to assemble this but 7 days is a lot for nowadays standards!

• 0 views • link
written by TriS TriS

Dear Tris, the organism is chicken. the gtf file is okay, because I used the same gtf file for mapping with Tophat. Also with the same gtf file I assembled using cufflinks in Galaxy. Does increasing --max-bundle-frags increase run time?

I am using a server that is having four computing nodes. Two (Za1, Za1) for assembly (512 GB RAM, 64 threads) and another two (Zm1, Zm2) for mapping (128 GB RAM, 32 threads). I am using node Zm1 as Za1 is having some problem. In the Zm1 node I am using 8 threads as per -p option.

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updated by Ram Ram • written by mjoyraj mjoyraj

How many threads did you reserve to run the analysis? with -p=8 and 32 threads you can run 4 analysis in parallel. if you reserved more than 4 then the analysis could end up being repeated by the other threads you reserved. if that happens then you increase memory usage and this might either cause the script to stop or to keep running until memory is freed from other threads not using it...do you have a log file from the server? not sure if this is the case but the log file could help

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updated by Ram Ram • written by TriS TriS

I am only running one with p=8. Sorry, I do not have log file.

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updated by Ram Ram • written by mjoyraj mjoyraj

1 answer

This is an old question, but just in case people are still struggling with this behavior. I found that using igemones for reference genome and gene annotations eliminated the problem. Look here: http://support.illumina.com/sequencing/sequencing_software/igenome.html

• 1 views • link
written by tronnenoron • tronnenoron

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