dmefs / bpftop

bpftop provides a dynamic real-time view of running eBPF programs. It displays the average runtime, events per second, and estimated total CPU % for each program.

bpftop

bpftop provides a dynamic real-time view of running eBPF programs. It displays the average runtime, events per second, and estimated total CPU % for each program. It also provides graphical views of these statistics over time. This tool minimizes overhead by enabling performance statistics only while it is active.

Installation

To download the latest release of bpftop, use the following command:

curl -fLJ https://github.com/Netflix/bpftop/releases/latest/download/bpftop -o bpftop && chmod +x bpftop

Features

• Displays a list of all running eBPF programs on the host, including the ID, type, and name
• Shows the period and total average runtime for each eBPF program.
• Calculates the events per second and estimated CPU utilization for each eBPF program
• Provides a graphical view of the average runtime, events per second, and estimated CPU utilization over a 10-second time period
• Dynamically updates the list every second
• Enables the statistics-gathering function only while it is active

Prerequisites

• bpftop requires sudo privileges to run.
• The Linux kernel version must be 5.8 or later.
• The binary is dynamically linked to libz and libelf, so these libraries must be present on the systems where you intend to run bpftop.

Usage

Run the following command to start bpftop on your host:

sudo ./bpftop

How it works

bpftop uses the BPF_ENABLE_STATS BPF syscall command to enable global eBPF runtime statistics gathering, which is disabled by default to reduce performance overhead. It collects these statistics every second, calculating the average runtime, events per second, and estimated CPU utilization for each eBPF program within that sample period. This information is displayed in a top-like tabular format. Once bpftop terminates, it disables the statistics-gathering function by deleting the file descriptor returned by BPF_ENABLE_STATS.

Building from source

1. Install and setup cross
2. Run cross build --release