[Users] [Einstein Toolkit] #1548: stdout redirection in multithreading scenario

[Roland Haas]

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Hello Gengbing,

> yes, that should work.
Very good.

> But CCTK_stdout may also need to be thread private variable to
> avoid race condition by multiple SMP threads.
Hmm, not sure I fully follow. Is it that for a run using AMPI, there
would be N pthreads (for an N core machine) but each one of those
pthreads would contain M user threads and so there would be N*M AMPI
ranks. Is this what you are thinking about?

This actually makes it harder since we have to worry about __thread
and (for non-AMPI runs) the pthreads that OpenMP creates and which
need to have their output FILE pointer initialized to that of the
owning process.

> So this will be similar to what I proposed to have a cctk_printf
> function.
Basically the cctk_printf functions are cctk_VWarn and cctk_VInfo.

Yours,
Roland

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