> Disabling basic_linear seems like a good idea but your config file sets the
> cut-off at 128 Bytes for 64-ranks (the field you set to 8192 seems to result
> in a message size of that value divided by the number of ranks).
> In my testing bruck seems to win clearly (at least for 64 ranks on my IB) up
> to 2048. Hence, the following line may be better:
> 131072 2 0 0 # switch to pair wise for size 128K/nranks
> Disclaimer: I guess this could differ quite a bit for nranks!=64 and different
Sounds strange for me. From the code is looks that we take the threshold as
is without dividing by number of ranks.