PAPI_hl_region_begin(3)

okay so this is the PAPI_hl_region_begin(3) page from the PAPI manual, and we're keeping every single deet while making it cute 💖

🌸 NAME 🌸

PAPI_hl_region_begin — reads performance events at the beginning of a region. that's the vibe, bestie ✨

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✨ SYNOPSIS ✨

Detailed Description 💅

C Interface 🎀

the C interface is literally:

#include <papi.h>
int PAPI_hl_region_begin( const char* region );

Parameters 🍓

• region — a unique region name. yes, it's gotta be unique 👑

Return values 🫶

• PAPI_OK — the success return value ✨
• PAPI_ENOTRUN — EventSet is currently not running or could not be determined.
• PAPI_ESYS — A system or C library call failed inside PAPI, see the errno variable.
• PAPI_EMISC — PAPI has been deactivated due to previous errors.
• PAPI_ENOMEM — Insufficient memory.

okay so what does it actually do? PAPI_hl_region_begin reads performance events and stores them internally at the beginning of an instrumented code region. If not specified via the environment variable PAPI_EVENTS, default events are used. The first call sets all counters implicitly to zero and starts counting. important note, bestie: if PAPI_EVENTS is not set or cannot be interpreted, default performance events are recorded. no cap 💀

Example 🍓

here's the little example, and it ate:

export PAPI_EVENTS="PAPI_TOT_INS,PAPI_TOT_CYC"

int retval;

retval = PAPI_hl_region_begin("computation");
if ( retval != PAPI_OK )
    handle_error(1);

 //Do some computation here

retval = PAPI_hl_region_end("computation");
if ( retval != PAPI_OK )
    handle_error(1);

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👀 See also 👀

• PAPI_hl_read
• PAPI_hl_region_end
• PAPI_hl_stop

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🧚 Author 🧚

Generated automatically by Doxygen for PAPI from the source code. iconic automated behavior, honestly 💅

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that's the page, bestie 🫶 this cute lil sign-off is Version 7.2.0.0, dated Wed Jun 25 2025 19:30:48, and it belongs to PAPI_hl_region_begin(3). mwah 💋