Whether a higher number of processors may cause unreliable results？

[youhuiqi7455]

hi, wrf experts
I have a 6 year long simulation,and I want it to be as fast as possible. I noticed this post "How many processors should I use to run WRF?" and according to the python code given there, my maximum processors is 25(e_we = 124, e_sn=56). Is it feasible if I increase processors (to 40 for example) for faster processing? Will it cause the results to become untrustworthy?

 

[Ming Chen]

Using different number of processors will yield slightly different results.
However, note that using more processors doesn't always mean faster running speed. this is because the communication between processors does take time. For tour case, I would suggest stay with 25,

 

[youhuiqi7455]

Using different number of processors will yield slightly different results.
However, note that using more processors doesn't always mean faster running speed. this is because the communication between processors does take time. For tour case, I would suggest stay with 25,

Many thanks to you, this is very helpful to me.