Question using sharp on one A100 device

[LeiHaoa]

Hi,
I have used a single A100 device to test the sharp performance when I test the RDMA performance, the device-to-device send/recv speed is about 18GB/s, when I use sharp to do allreduce operation (as only one process is used, there are no calculations i think.), the speed is 12GB/s. So my question what may cause the performance to degrade？

Thanks！

[shanleo2024]

Hi, how did you test the sharp successfully? I cannot run sharp as there is some error happens.
Which is in this issue:
#151