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#849 in Command line utilities

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MIT license

208 lines


crates.io documentation license tests

A command line tool to split a stream by a delimiter and pipe each section to a child process.


cargo install xstream-util


For a simple illustration of the speed up for reasonably sized streams, the following simple benchmark compares generating 1001 streams of integers and summing them with bc.

First, generate a null delimited set of streams with

time for I in {10000..11000}; do seq $I; echo -ne '\0'; done

This stream is roughly 50M, making each stream roughly 50k.

I then piped this into xstream as

| time xstream -0 -- bash -c 'paste -sd+ | bc' > /dev/null

and xargs as

| time xargs -0I@ bash -c '<<< "@" head -n-1 | paste -sd+ | bc' > /dev/null

which on my system gives:

Program User System Elapsed
xstream 10.21s 1.67s 0:09.58
xargs 15.72s 2.85s 0:14.52

This benchmark is a toy example, but xstream already provides a 30% speed up when each stream is only 50k.


~83K SLoC