Using Switch-Based Communications

Totalview® User Guide : Part IV: Advanced Tools, Configuration, and Customization : Setting Up MPI Debugging Sessions : IBM MPI Parallel Environment (PE) Applications : Preparing to Debug a PE Application : Using Switch-Based Communications

If you’re using switch-based communications (either IP over the switch or user space) on an SP computer, configure your PE debugging session so that TotalView can use IP over the switch for communicating with the TotalView Server (tvdsvr). Do this by setting the -adapter_use option to shared and the -cpu_use option to multiple, as follows:

If you’re using a PE host file, add shared multiple after all host names or pool IDs in the host file.

Always use the following arguments on the poe command line:

-adapter_use shared -cpu_use multiple

If you don’t want to set these arguments on the poe command line, set the following environment variables before starting poe:

setenv MP_ADAPTER_USE shared

setenv MP_CPU_USE multiple

When using IP over the switch, the default is usually shared adapter use and multiple cpu use; we recommend that you set them explicitly using one of these techniques. You must run TotalView on an SP or SP2 node. Since TotalView will be using IP over the switch in this case, you cannot run TotalView on an RS/6000 workstation.