PAPI_ipc(3)

💖 NAME 💖

Okay bestie, welcome to the PAPI_ipc(3) page from the PAPI manual — yes, the manual name is literally PAPI, and this is the page you want. 💅

PAPI_ipc — Simplified call to get instructions per cycle, real and processor time. Periodt. ✨

✨ SYNOPSIS ✨

💫 Detailed Description 💫

Okay so here's the whole breakdown, bestie — the C interface, parameters, return values, and the actual vibe of what happens when you call it. No cap. 🦋

🎀 C Interface: 🎀

#include <papi.h>
int PAPI_ipc( float *rtime, float *ptime, long long *ins, float *ipc );

📝 Parameters 📝

• *rtime — realtime since the latest call ⏱️
• *ptime — process time since the latest call 🕰️
• *ins — instructions since the latest call 🔢
• *ipc — incremental instructions per cycle since the latest call ⚡

🚦 Return values 🚦

• PAPI_EINVAL — the counters were already started by something other than PAPI_ipc(). Rude, honestly. 😭
• PAPI_ENOEVNT — the events PAPI_TOT_INS and PAPI_TOT_CYC are not supported. Not every chip is invited to the party. 💀
• PAPI_ENOMEM — insufficient memory to complete the operation. The math said no. 🫠

The first call to PAPI_ipc() will initialize the PAPI interface, set up the counters to monitor PAPI_TOT_INS and PAPI_TOT_CYC events and start the counters. Main character energy from call one. 👑

Subsequent calls will read the counters and return real time, process time, instructions and the IPC rate since the latest call to PAPI_ipc(). Literally the update you asked for. 💖

PAPI_ipc() should return a ratio greater than 1.0, indicating instruction level parallelism within the chip. The larger this ratio the more efficiently the program is running. And note that PAPI_ipc() is thread-safe and can therefore be called by multiple threads. Slay, concurrency bestie. 🌈

👀 See also 👀

• PAPI_flips_rate()
• PAPI_flops_rate()
• PAPI_epc()
• PAPI_rate_stop()

🫶 AUTHOR 🫶

Generated automatically by Doxygen for PAPI from the source code.

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xoxo, Version 7.2.0.0, dated Wed Jun 25 2025 19:30:48 — this was PAPI_ipc(3), signing off 💖🫶✨