[Haskell-cafe] how do FFI calls show up in profiling info?

[Johannes Waldmann]

Dear Cafe,

how would FFI calls show up in profiles?

I am using hmatrix-glpk. The relevant FFI call is in
https://hackage.haskell.org/package/hmatrix-glpk-0.19.0.0/docs/src/Numeric.LinearProgramming.html#simplexSparse

I am compiling with profiling (for executables and libraries),
and I am running with +RTS -P .
The .prof file does not contain  c_simplex_sparse (the C function)

It does mention  simplexSparse (the Haskell function that calls it)
but with a suspiciously low time.

- J.W.