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Low-overhead tracing of all Linux kernel-user transitions, for serious performance analysis. Includes kernel patches, loadable module, and post-processing software. Output is HTML/SVG per-CPU-core timeline that you can pan/zoom down to the nanosecond.

License: GNU General Public License v3.0

Makefile 0.01% C 0.45% C++ 1.25% HTML 98.28% Shell 0.01%

kutrace's Introduction

KUtrace is an extremely low-overhead Linux kernel tracing facility for observing all the execution time on all cores of a multi-core processor, nothing missing, while running completely unmodified user programs written in any computer language. It has been used in live datacenters (x86 processors) and in real-time autonomous driving (ARM processors) to understand long-standing performance mysteries. The design goal of KUtrace is to reveal the root cause(s) of unexpected delayed responses in real-time transactions or database processing while having such low overhead that it does not distort the system under test.

See the kutrace/docs/overview.pdf file for more detail.

Richard L. Sites, July 2019

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