Back BLAST are extremely long and doesn't seems to use all the core usable
When the back BLAST start it's use some of the core at disposition (define by NO_CPU) but not all, and later do the BLAST one by one, instead of using all the core.
When the back BLAST start it's use some of the core at disposition (define by NO_CPU) but not all, and later do the BLAST one by one, instead of using all the core.