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Tracing per-PID, per-thread network traffic. This is socktraf.bt, a bpftrace program for accurate per-process measurement of network traffic:

In the following I’m going to explain line-by-line how to write a bpftrace program that measures per-process network traffic. There are excellent online resources to learn how to write bpftrace programs, see the Further reading section. bpftrace’s language is inspired by awk and C, and some predecessor tracing systems like DTrace and SystemTap. Refer to this guide to install bpftrace on your system. It translates a high-level domain specific language used to define probes into enhanced Berkeley Packet Filter (eBPF, or just BPF) 1 code that allows accurate measurements with minimal overhead 2. Measuring bandwidth with bpftraceīpftrace is tracing tool for Linux that allows defining tracing programs that get entirely executed within the kernel. We can easily build accurate monitoring for all traffic in only 40 lines of code for bpftrace. it is blind to all non-TCP traffic (see issues/62.it requires a costly copy from kernel space to user space for every single packet.This approach comes with two disadvantages: Nethogs works by parsing /proc/net/tcp and /proc/net/tcp6 to get a mapping from connected TCP endpoints to inodes, capturing all traffic using libpcap, parsing each packet, and finding which process owns the TCP connection of each packet. Differently from the previous tools, nethogs does report per-process bandwidth usage, but it suffers from other flaws.

Not only this is very laborious and fragile, but it also risks missing spikes of traffic on very short-lived sockets.Ī tool that gets mentioned a lot is nethogs. Most of the recommended tools – like iftop, nload, bmon, and iptraf – miss the mark by quite a bit: they mostly report per-interface or per-socket traffic, leaving to the user the tedious exercise of mapping sockets to processes via perilous parsing of /proc/net/tcp, or grep-ping and awk-ing of the output of ss or netstat.

Searching for “per process network usage linux” is disappointing.