MPI_T_event_get_timestamp(3)

💖 MPI_T_event_get_timestamp — the MPI manual, section 3 🎀

okay bestie, so you know how events get observed by the implementation and you're like "but WHEN tho??" — this is literally that. MPI_T_event_get_timestamp gives you the timestamp of the moment the event was first observed by the implementation. it's giving time detective energy fr fr 🕵️♀️✨

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✨ SYNOPSIS ✨

int MPI_T_event_get_timestamp(MPI_T_event_instance event_instance,
       MPI_Count *event_timestamp)

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💅 INPUT PARAMETERS 💅

• event_instance — the event instance that got handed to your callback function (it's a handle, bestie). 🫶

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🌸 OUTPUT PARAMETERS 🌸

• event_timestamp — the timestamp of when the event was observed. it's an integer. no cap. ⏰

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🧚 THREAD AND INTERRUPT SAFETY 🧚

okay so the good news: this routine is thread-safe. that means multiple threads can use it at the same time and you do not need to bring your own thread locks — the routine handles that for you, periodt. 💅

but here's the thing, and I need you to listen: it is not interrupt safe. typically that's because it uses memory allocation routines like malloc or other non-MPICH runtime routines that are themselves not interrupt-safe. so like, adorable and safe for threads, but do not come for it with interruptions. 😭

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💀 ERRORS 💀

so literally every MPI routine out here returns an error value — except MPI_Wtime and MPI_Wtick, those two are the exceptions, iconic behavior honestly. for C routines the error value is the return value of the function, and for Fortran routines it lands in the last argument. before that value gets returned, the current MPI error handler is called. by default, that error handler aborts the MPI job — yes, the whole thing, dramatic. 💀

you can swap the error handler with MPI_Comm_set_errhandler (for communicators), MPI_File_set_errhandler (for files), and MPI_Win_set_errhandler (for RMA windows). there's also the MPI-1 routine MPI_Errhandler_set, and you may use it, but its use is deprecated — so like, maybe don't. 🙈

you can also use the predefined error handler MPI_ERRORS_RETURN to make error values actually get returned instead of, y'know, everything exploding. also important: MPI does not guarantee that an MPI program can continue past an error. however, MPI implementations will attempt to continue whenever possible. so like, no promises, but they're trying their best. 🫶

• MPI_SUCCESS — no error, the MPI routine completed successfully. we love a clean run. ✨
• MPI_T_ERR_INVALID — invalid use of the interface, or bad parameter value(s). something's not matching up, bestie. 😬
• MPI_T_ERR_INVALID_HANDLE — the handle is invalid. not a real one, nope. 🙅♀️
• MPI_T_ERR_NOT_INITIALIZED — the MPI tool information interface is not initialized. you gotta turn it on first. 🔌
• MPI_ERR_OTHER — other error; use MPI_Error_string to get more info about this error code. catch-all vibes. 🌈

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🎀 reminder: keep every value, handle and error code exactly as written — the vibe is mine, the facts are the manpage's. iykyk. 💜

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and that's the whole page, bestie! this came straight from the MPI manual (section 3), dated 4/10/2026. go get that timestamp, you absolute main character. 👑🦋💖