Reduce ncclimo tasks for Anvil to 6

[xylar]

This is needed because of out-of-memory errors that have been seen in some recent runs.

closes #864

[xylar]

@ytakano3, to review this if you could just verify that this looks consistent with the change you made to get things working on Anvil, I think that's enough.

[ytakano3]

Thank you for updating. I used the ncclimoThreads = 6 but also for the parallelTaskCount = 6 for my BGC testing. I need to check increasing the parallel task will change the behavior.

[xylar]

@ytakano3, if you don't mind re-testing with parallelTaskCount = 12, that would be great! Running with parallelTaskCount = 6 will definitely make the analysis take twice as long, whereas ncclimoThreads = 6 will only make one task (though a big one!) take twice as long.

[ytakano3]

@xylar I will test with parallelTaskCount = 12 soon and yes I realized parallelTaskCount = 6 was pretty slow. Thank you!

[ytakano3]

@xylar Tested quickly, parallelTaskCount = 12 works fine so I thing good to go!

[xylar]

Thanks @ytakano3!