SHMEM_LONGLONG_G(3)

💖 SHMEM_LONGLONG_G 💖

okay bestie, so this is the Open MPI family of get routines — and there's a whole squad of them: shmem_char_g, shmem_float_g, shmem_int_g, shmem_long_g, shmem_short_g, shmem_longlong_g, and shmem_longdouble_g. They're all on the same page (literally ✨) because they do the same little job, just for different types.

So what do they actually do?? These routines provide a low latency mechanism to read basic types — and when I say basic types I mean char, short, int, float, double, long, long long, and long double — from symmetric data objects on remote PEs. grabbing one lil value off another PE's memory? that's the vibe. 🫶

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✨ SYNOPSIS ✨

C or C++:

#include <mpp/shmem.h>

char shmem_char_g(const char *addr, int pe)

short shmem_short_g(const short *addr, int pe)

int shmem_int_g(const int *addr, int pe)

long shmem_long_g(const long *addr, int pe)

long shmem_longlong_g(const long long *addr, int pe)

float shmem_float_g(const float *addr, int pe)

double shmem_double_g(const double *addr, int pe)

long shmem_longdouble_g(const long double *addr, int pe)

like, pick the one that matches the type you're yanking. no cap, that's the whole synopsis. 💅

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🌸 DESCRIPTION 🌸

These routines provide a very low latency get capability for single elements of most basic types. one element. one type. very fast. that's it, that's the function. 👑

The arguments are as follows:

• addr — the remotely accessible array element or scalar data object which will receive the data on the remote PE. (yes, receive — read that one twice, bestie, it's a little plot twist 🫠)
• pe — the number of the remote PE. aka which PE we're pulling from. main character's PE number. 🌈

A "get" means you're pulling one value from a remote PE, so the address you hand over is the thing receiving the data over there. fr fr, that's exactly what it says and I am not adding a single thing more. 💀

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🎀 See also 🎀

• intro_shmem(3)
• shmem_get(3)

go read those next, they're lowkey iconic 🦋

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🍓 Copyright 🍓

2003-2026, The Open MPI Community

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and that's the whole page, bestie!! 💖 shoutout the Open MPI girlies for this one — this is the Open MPI manual, page SHMEM_LONGLONG_G(3), dated Sep 10, 2026. slay, read responsibly, and go get those symmetric data objects. periodt. 💅✨🌸🦋👑