Comments (2)
This comes from the launch environment. Here's what you probably tried (roughly)
$ cargo run --example demo
Finished dev [unoptimized + debuginfo] target(s) in 0.18s
Running `target/debug/examples/demo`
thread 'main' panicked at 'Size of MPI_COMM_WORLD must be 2, but is 1!', examples/demo.rs:12:9
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
You can run the executable directly like this
$ mpiexec -n 2 target/debug/examples/demo
Process 1 got message [4.0, 8.0, 15.0].
Status is: Status { source_rank: 0, tag: 0 }
You can also use the cargo-mpirun package for better ergonomics.
How do you reckon would be a good way to document this in the docs you read?
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I'll close this assuming that it worked for you, but feel free to reopen.
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