How to get the communication details in SimCCL

[linsyking]

In the paper S 3.4, there is a paragraph mentioning:

Collective Communication Transformation: SimCCL intercepts collective communication calls, reconstructing
the operations to trace lower-level communications. It
skips actual data transfers and captures inter-GPU communication events, including data size, sender and receiver ranks, and routes, to simulate RDMA-layer behavior

I wonder how to use SimCCL to get the inter-GPU communication events. Currently MultiDevOneP.cc does not seem to provide such information.

[tianhao909]

Hello, could you please refer to the code in SimCCL/src/debug.cc and check if there is any information that can be printed?

The overall call process of SimCCL should be init.cc → graph → Collectives.cc → enqueue.cc → debug.cc.

You may use GDB to trace the relevant files and functions.

/SimCCL/src/debug.cc