Hi @jairideout, @benjjneb, @gregcaporaso,
I tried last night with multi-thread 0, which shows 4 in the system activity and 390%CPU (~98%*4).
After a while, I got an error message.
$ qiime dada2 denoise-paired --i-demultiplexed-seqs paired-end-demux.qza --o-table table --o-representative-sequences rep-seqs --p-trim-left-f 0 --p-trim-left-r 0 --p-trunc-len-f 300 --p-trunc-len-r 300 --p-n-threads 0
Plugin error from dada2:
Command '['run_dada_paired.R', '/var/folders/5y/k_d_lfy57pxbg3l7j_3r9y
sh0000gn/T/tmp6rkj5go1/forward', '/var/folders/5y/k_d_lfy57pxbg3l7j_3r
9ysh0000gn/T/tmp6rkj5go1/reverse', '/var/folders/5y/k_d_lfy57pxbg3l7j_
3r9ysh0000gn/T/tmp6rkj5go1/output.tsv.biom',
'/var/folders/5y/k_d_lfy57pxbg3l7j_3r9ysh0000gn/T/tmp6rkj5go1/filt_f',
'/var/folders/5y/k_d_lfy57pxbg3l7j_3r9ysh0000gn/T/tmp6rkj5go1/filt_r',
'300', '300', '0', '0', '2.0', '2', 'consensus', '1.0', '0',
'1000000']' returned non-zero exit status 1
Debug info has been saved to /var/folders/5y/k_d_lfy57pxbg3l7j_3r9ysh0000gn/T/qiime2-q2cli-err-4vorneiu.log.
I installed Qiime 2-2017.6, I also have MacQiime 1 installed.
Here is the qza I used.
https://drive.google.com/open?id=0B51bEY9nCyLXbm5sMm9aVXRDRlU
Thank you, everyone.