ipftrace2で始めるLinuxネットワークスタック探訪 - Qiita
皆さんはLinuxネットワークスタックの問題にあたってしまった時、あるいは単なる興味でLinuxネットワークスタックの中を調べたいと思い立った時、どのようにして調査を進めますか？カーネルのソースコードに printk を仕込んでカーネルを再コンパイルするでしょうか？もしくは最初からソースコードを読むという強い方もいらっしゃるかもしれません。どちらの方法もなかなかの茨の道です。おそらく、ほとんどの方は最終的にftrace やbpftraceなどのDynamic Tracingツールを使って、カーネルの動作を実際に動かしながら見るという方法に至ると思います。 この記事では ipftrace2 というDynamic Tracingツールの基本的な使い方をサンプルとともに紹介します。ipftrace2はネットワークスタック、特にパケット処理の部分をトレーシングをすることに特化した作りになっており、
Linux perf Profiler UIs
Linux perf Profiler UIs pprof Web UI looking at a flamechart of regexp stack traces. This post is a quick literature review of CPU profiler user interfaces available for analysing Linux program performance. I couldn't find any list of profiler UIs online. Hopefully this can help people find the profiler UI that's right for them. CPU Profiler output is extremely multidimensional — processes, thread
Google-Wide Profiling: A Continuous Profiling Infrastructure for Data Centers – Google Research
Google-Wide Profiling (GWP), a continuous profiling infrastructure for data centers, provides performance insights for cloud applications. With negligible overhead, GWP provides stable, accurate profiles and a datacenter-scale tool for traditional performance analyses. Furthermore, GWP introduces novel applications of its profiles, such as application- platform affinity measurements and identifica
Linux perfで快適に計測するためのtips - Qiita
これがあるのとないのとでは分かりやすさが全然違うので、perfを使う時は常に入れておくようにすると便利です。 2. --call-graph は fp 以外で使う 上記の問題を解決すると perf record + perf report では何が呼ばれているかおおむね分かることが多いのですが、call graphを出すために perf record -g をすると [unknown] というのが出てきてしまうことがあります。(以降の計測結果はRack::Utils::HeaderHashを使ったRuby VMのベンチをRubyのmasterで走らせたものです) Samples: 38K of event 'cycles:ppp', Event count (approx.): 271180000 Children Self Command Shared Object Symbol - 1
C2C - False Sharing Detection in Linux Perf - My Octopress Blog
Do you run your application in a NUMA environment? Is it multi-threaded? Is it multi-process with shared memory? If so, is your performance impacted by false sharing? Now there’s a way to easily find out. We’re posting patches for a new feature to the Linux perf tool, called “c2c” for cache-2-cache. We at Red Hat have been running the development prototype of c2c on lots of big Linux applications
GitHub - plasma-umass/coz: Coz: Causal Profiling
by Charlie Curtsinger and Emery Berger Coz is a profiler for native code (C/C++/Rust) that unlocks optimization opportunities missed by traditional profilers. Coz employs a novel technique called causal profiling that measures optimization potential. It predicts what the impact of optimizing code will have on overall throughput or latency. Profiles generated by Coz show the "bang for buck" of opti
strace
linux syscall tracer Official repositories are at GitHub and GitLab. You can get latest binary packages from Fedora rawhide, OBS, Sisyphus. The latest officially signed release tarball can be found here. Development takes place on the mailing list (archive). Everyone is welcome to send bug reports, feature requests, comments and patches there. IRC channel: #strace@oftc. strace is released under th
PAPI
Overview The Performance Application Programming Interface (PAPI) supplies a consistent interface and methodology for collecting performance counter information from various hardware and software components, including most major CPUs, GPUs, accelerators, interconnects, I/O systems, and power interfaces, as well as virtual cloud environments. Industry liaisons with AMD, Cray, Intel, IBM, NVIDIA, an
Tiptop
Hardware performance monitoring counters have recently received a lot of attention. They have been used by diverse communities to understand and improve the quality of computing systems: for example, architects use them to extract application characteristics and propose new hardware mechanisms; compiler writers study how generated code behaves on particular hardware; software developers identify c
Valgrind
To use this tool, you must specify --tool=dhat on the Valgrind command line. DHAT is primarily a tool for examining how programs use their heap allocations. It tracks the allocated blocks, and inspects every memory access to find which block, if any, it is to. It presents, on a program point basis, information about these blocks such as sizes, lifetimes, numbers of reads and writes, and read and w
DTrace for Linux 2016
Recent posts: 24 Mar 2024 » Linux Crisis Tools 17 Mar 2024 » The Return of the Frame Pointers 10 Mar 2024 » eBPF Documentary 28 Apr 2023 » eBPF Observability Tools Are Not Security Tools 01 Mar 2023 » USENIX SREcon APAC 2022: Computing Performance: What's on the Horizon 17 Feb 2023 » USENIX SREcon APAC 2023: CFP 02 May 2022 » Brendan@Intel.com 15 Apr 2022 » Netflix End of Series 1 09 Apr 2022 » Te
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GitHub - P403n1x87/austin: Python frame stack sampler for CPython
GitHub - koute/bytehound: A memory profiler for Linux.
Profiling in Chromium OS
GitHub - uber-archive/pyflame: 🔥 Pyflame: A Ptracing Profiler For Python. This project is deprecated and not maintained.
GitHub - KDE/heaptrack: A heap memory profiler for Linux
⚙ D43951 [RFC] llvm-mca: a static performance analysis tool.
GitHub - HewlettPackard/LinuxKI: LinuxKI Toolset (Trace-based performance analysis tool)
GitHub - rkern/line_profiler: (OLD REPO) Line-by-line profiling for Python - Current repo ->
GitHub - wkz/ply: Light-weight Dynamic Tracer for Linux