Give minimap more threads when available. about chopper HOT 4 CLOSED

That number only affects the building of the index, not the alignment itself. So changing this will not have too much effect. That said, it shouldn't be hardcoded to '8'. Chopper will, at the moment, when a contaminant is being filtered out, not use multithreading. The reason behind this is because it does not support using rayon. This may change in the future, and pull requests are appreciated.

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I'd be happy to give it a crack though I've never worked with rust. I see rayon is the parallelism library. Any tips before I attempt this?

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Well it shouldn't be done with rayon in this case, as that is not supported for minimap2-rs alignment. There are other options for parallelization, but none that I am sufficiently comfortable with.

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Here is an example for parallelization

https://github.com/jguhlin/minimap2-rs/blob/main/fakeminimap2/src/main.rs

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