FlashPCA2 not multithreading

[chelsie benca]

I have flashpca2 installed on our linux server and ran:
flashpca --bfile data --ndim 20 --numthreads 60

yet it doesn't seem to be multithreading...

Has anyone else run into this issue?

[Gad Abraham]

Hi Chelsie,

In v2, the flashpca multithreading probably won't help much because
what it does is enable the Eigen library's multi-threading, and Eigen
at the moment only really uses multithreading for a few operations
like matrix-matrix multiplication (which generally isn't used much in
flashpca, it's mostly matrix-vector operations). So best to stick with
single-threading for now.

Regards,
Gad

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