Technology

Researchers publish paper on mold parallel linker for Unix and Linux systems

A clean-slate design aims to reduce software link times by applying data parallelism across the entire linking pipeline.

Updated Aug 26, 2026 · 21:20 UTC1 reports

The short version

Computer science researchers presented a paper on mold, a parallel software linker designed for Unix and Linux operating systems.
The linker aims to solve long-standing edit-compile-debug bottlenecks in large C++ programs by distributing tasks across all available CPU cores.
Tests reported in the paper indicate mold links large debug binaries in a few seconds or less, outperforming existing linkers like lld and GNU ld.

The mold linker is designed to systematically apply data parallelism across every stage of the software linking pipeline.[Hacker News]
The authors state that mold can link multi-gigabyte debug binaries on large programs in under a second or within a few seconds at most.[Hacker News]
According to the paper, mold performs 2.4 to 16.1 times faster than lld and up to 112 times faster than GNU ld.[Hacker News]
An ablation study in the paper indicates the performance increases stem from parallelizing all pipeline passes together rather than a single optimization.[Hacker News]

Independent third-party verification of the paper's benchmark claims across different hardware configurations and codebases is not provided in the source.[Hacker News]