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  • KlChen
    replied
    Thank you very much!

    Originally posted by dpryan View Post
    Nothing is wrong with Bismark. When you run bowtie1 using multiple threads, you can't guarantee what order the reads will be returned in. Since Bismark runs multiple instances of bowtie at once and then processes their outputs, it needs the reads to be in the same order (otherwise, you end up comparing different reads and everything breaks down). In bowtie2, this can be enforced with --reorder, but no such option exists in bowtie1. Just use bowtie2.

    Leave a comment:


  • dpryan
    replied
    Nothing is wrong with Bismark. When you run bowtie1 using multiple threads, you can't guarantee what order the reads will be returned in. Since Bismark runs multiple instances of bowtie at once and then processes their outputs, it needs the reads to be in the same order (otherwise, you end up comparing different reads and everything breaks down). In bowtie2, this can be enforced with --reorder, but no such option exists in bowtie1. Just use bowtie2.

    Leave a comment:


  • KlChen
    started a topic Parallelization for Bismark using Bowtie 1

    Parallelization for Bismark using Bowtie 1

    For Bowtie 1, I can use the -p option to do parallel search, but when I run Bismark with Bowtie 1 and the option -p 7, output is

    "The parallelization switch '-p' only works for Bowtie 2. Please respecify! at bismark/bismark_v0.9.0/bismark line 6497

    What's wrong with -p and Bismark? How can I speed up my alignment with Bowtie 1? Shall I use Bowtie 2 instead?

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