change pplacer threads to 1 in processor.py

[Anna-MarieSeelen]

Temporarily Fixes #231
Long-term maybe another solution is preferred.

[rhysnewell]

Hi @Anna-MarieSeelen,

This wouldn't be our preferred solution to this. However, this may work for you currently. I think adding back in an optional parameter (--pplacer-threads), which is only used when the user supplies would be ideal.

@AroneyS, Have you come across this issue with gtdb-tk and pplacer in the QUT HPC? #231

[AroneyS]

I have not seen this issue, but I haven't run GTDBtk through Aviary for a while.
I second the readdition of the pplacer threads argument.

[Anna-MarieSeelen]

Thank you for your response! 😊 I understand this isn’t the preferred solution, but I just wanted to share my temporary fix in case it helps anyone in the meantime. Since you indicated that this temporary fix likely won’t be used, I’ll go ahead and close the pull request.
Reintroducing the optional --pplacer-threads parameter sounds like a great long-term solution. Thanks!