NMF in parallel mode runs only in two cores. #188
Description
I ran NMF in parallel mode by setting .options = 'v2p8' in the Ubuntu terminal using R. However, it seems that NMF only uses 2 cores, regardless of the value I assign to p. Has anyone experienced this or know how to make better use of available cores?
Thanks!
> nmf_res = nmf(df, rank = 5:20, method = 'snmf/l', seed = 123, nrun = 100, .options = 'v2p8')
Compute NMF rank= 5 ... NMF algorithm: 'snmf/l'
Multiple runs: 100
# Setting up requested `foreach` environment: try-parallel [par]
# Check host compatibility ... OK
# Registering backend `doParallel` ... OK
# Setting up RNG ... OK
# Using foreach backend: doParallelMC [version 1.0.17]
Mode: parallel (2/16 core(s))
# Check shared memory capability ... NO