MPI_WTICK(3)

💖 MPI_Wtick 💖

okay so bestie, we're in the Open MPI section of the manual (that's the manual name, mwah) and this page is MPI_WTICK(3) — say it with me now: MPI_Wtick. it's giving "how precise is my clock, actually?" energy and honestly? we're obsessed. ✨

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🌸 NAME 🌸

MPI_Wtick — returns the resolution of MPI_Wtime. 🕰️

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✨ SYNTAX ✨

🎀 C Syntax

#include <mpi.h>

double MPI_Wtick()

🦋 Fortran Syntax

USE MPI
! or the older form: INCLUDE 'mpif.h'
DOUBLE PRECISION MPI_WTICK()

💜 Fortran 2008 Syntax

USE mpi_f08
DOUBLE PRECISION MPI_WTICK()

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💅 RETURN VALUE 💅

time in seconds of the resolution of MPI_Wtime. that's it. that's the return. ✨

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🌈 DESCRIPTION 🌈

so MPI_Wtick returns the resolution of MPI_Wtime, measured in seconds. and like, what does that mean bestie? it means: it hands you back a double-precision value — the number of seconds between two successive clock ticks. the gap. the lil baby delay between one tick and the next. 🎀

for example (and this is the example, no cap): if the clock is implemented by the hardware as a counter that gets incremented every millisecond, then the value returned by MPI_Wtick should be 10^-3. iconic. periodt. 💖

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🔥 NOTE 🔥

not me about to tell you the scary part 😭 bestie this function does not return an error value. consequently, the result of calling it before MPI_Init or after MPI_Finalize is undefined. so like… don't do that. please. for me. 🙈

See also:

• MPI_Wtime

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👑 Copyright 👑

2003-2026, The Open MPI Community

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and that's the whole vibe check, bestie — this masterpiece landed in the Open MPI collection on Sep 10, 2026, filed under MPI_WTICK(3). go forth and time things precisely 💜🫶