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gem5

The official repository for the gem5 computer-system architecture simulator.

by gem5 · GitHub
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architecturearmmodelingBSD-3-ClauseC++
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Simulate computer systems to test and evaluate new hardware and software designs.

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2026-07-152026-08-31
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📄 About

The official repository for the gem5 computer-system architecture simulator.

gem5 has 2.7k stars on GitHub. It has been forked 1.9k times. gem5 is written mainly in C++. It has been in active development since 2014. gem5 is available under the BSD-3-Clause license. Its main topics are architecture, arm, modeling, open-source.

Frequently asked questions

What is gem5?

The official repository for the gem5 computer-system architecture simulator.

Is gem5 open source?

gem5 is an open-source project. It is released under the BSD-3-Clause license.

Is gem5 free?

Yes. gem5 is free and open source — you can use, modify and self-host it.

What license does gem5 use?

gem5 is available under the BSD-3-Clause license.

What language is gem5 written in?

gem5 is written mainly in C++.

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