hotspot | tracy | |
---|---|---|
16 | 57 | |
3,874 | 7,856 | |
1.4% | - | |
9.3 | 9.6 | |
3 days ago | 5 days ago | |
C++ | C++ | |
GNU General Public License v3.0 or later | GNU General Public License v3.0 or later |
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
hotspot
- Hotspot: A GUI for the Linux perf profiler
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What is your favourite profiling tool for C++?
perf with Hotspot 👌
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Profiling C code on an M1 mac
If you’re able to use perf on Linux, I would recommend hotspot for visualizing the results.
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What is the problem with transfer speeds withing Dolphin?
I can recommend you using the https://github.com/KDAB/hotspot/ tool whenever you want to study performance.
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Data-driven performance optimization with Rust and Miri
Every Linux C/C++/Rust developer should know about https://github.com/KDAB/hotspot. It's convenient and fast. I use it for Rust all the time, and it provides all of these features on the back of regular old `perf`.
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How to interpret a flamegraph?
Flamegraphs alone aren't a full picture of what your application is doing, but it can give you hints as to where to look. Another tool I often use is Hotspot which can open the perf.data file and provide more options for filtering and digging into the gathered data beyond the single flamegraph.
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Twenty Years of Valgrind
Ignore the command, it's just a placeholder to get meaningful values. The -d flag adds basic cache events, by adding another -d you also get load and load miss events for the dTLB, iTLB and L1i cache.
But as mentioned, you can instrument any event supported by your system. Including very obscure events such as uops_executed.cycles_ge_2_uops_exec (Cycles where at least 2 uops were executed per-thread) or frontend_retired.latency_ge_2_bubbles_ge_2 (Retired instructions that are fetched after an interval where the front-end had at least 2 bubble-slots for a period of 2 cycles which was not interrupted by a back-end stall).
You can also record data using perf-record(1) and inspect them using perf-report(1) or - my personal favorite - the Hotspot tool (https://github.com/KDAB/hotspot).
Sorry for hijacking the discussion a little, but I think perf is an awesome little tool and not as widely known as it should be. IMO, when using it as a profiler (perf-record), it is vastly superior to any language-specific built-in profiler. Unfortunately some languages (such as Python or Haskell) are not a good fit for profiling using perf instrumentation as their stack frame model does not quite map to the C model.
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Linux Perf Examples
> [...] how Perf compares to vendor tools like vTune [...] ?
Regarding the hardware events that Perf can capture on x86, it has pretty much all of them. So it should be equivalent to vTune for all practical purposes.
The big difference is in the UI -- or absence thereof. Perf is a low-level tool and its output is mostly text files. There is a curses-based TUI for perf-report (and even gtk version, but it is essentially the same as the TUI, just using GTK2 widgets), but that's about it.
By contrast, vTune comes with a heavy (electron-based?) GUI and is quite helpful in guiding beginners, with many graphs and explanations.
Of course, one can (and is expected to) complement Perf with an assortment of tools that process its output for visualization. For example, the flamegraph [1] and heat map [2] tools described in the article. But also KDAB hotspot [3] or HPerf for a vTune-style perf-report.
[1] https://github.com/brendangregg/FlameGraph
[2] https://github.com/brendangregg/HeatMap
[3] https://github.com/KDAB/hotspot
[4] https://www.poirrier.ca/hperf/
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Parsers that don't yet exist?
https://github.com/KDAB/hotspot might contain parsing code you could use as an example (other than perf script). It always accepts raw perf.data, and there doesn't seem to be a way to feed it the output of perf script, so it might be parsing it directly instead of calling perf script.
tracy
- Tracy: Real-time nanosecond resolution frame profiler
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Google/orbit – C/C++ Performance Profiler
i don't really think there is _anything_ that comes even close to tracy https://github.com/wolfpld/tracy.
on top of this, given google's penchant for dumping projects aka abandonware, this would be an easy pass.
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Immediate Mode GUI Programming
The RemedyBG debugger (https://remedybg.handmade.network/) and the Tracy profiler (https://github.com/wolfpld/tracy) both use Dear ImGui and so far I've only read high praise from people who used those tools compared to the 'established' alternatives.
For tools like this, programmers are also just "normal users", and from the developer side, I'm sure they evaluated various alternatives with all their pros and cons before settling for Dear ImGui.
- Tracy Profiler
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Tuning Linux for Performance
Not the person you asked, but generally you might want to look at "frame-based" profilers. These are typically used in video games, but the concept is general, and can apply to other applications. The "frame" could also be something like a request or transaction being processed. I like Tracy[1], myself.
Another latency metric that you'll see, often w/respect to web apps and microservices is "P99" and similar. This is the amount of time in which 99% of requests get their response. For a higher percentile, you get a better idea of worst-case performance.
[1] https://github.com/wolfpld/tracy
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What is your favourite profiling tool for C++?
I've not actually used Superluminal, but I use Tracy for similar reasons. It's free though (and, importantly, open source).
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My first game engine
For profiling, you can check tracy.
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I got my procedural city engine / game (built from scratch in c++) running on the steam deck - does it look too garish?
You could try Tracy
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Sharing Saturday #462
There is no such thing as overengineering in fun projects, so I've also adopted Tracy as profiling solution. Works quite nice and gonna save me plenty of times in the future debugging performance spikes on badly optimized math heavy operations.
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Debugging and profiling embedded applications.
I know about tools such as tracing, jaeger or tracy. While having a complete tracing could be a potential solution, these tools don't work with no_std.
What are some alternatives?
FlameGraph - Stack trace visualizer
optick - C++ Profiler For Games
polkit-dumb-agent - a polkit agent in 145 lines of code, because polkit is dumb and none of the other agents worked
orbit - C/C++ Performance Profiler
firestorm - A fast intrusive flamegraph
palanteer - Visual Python and C++ nanosecond profiler, logger, tests enabler
gta5view - Open Source Snapmatic and Savegame viewer/editor for GTA V
pprof - pprof is a tool for visualization and analysis of profiling data
cargo-flamegraph - Easy flamegraphs for Rust projects and everything else, without Perl or pipes <3
parallel-hashmap - A family of header-only, very fast and memory-friendly hashmap and btree containers.
optick-rs - Optick for Rust
STL - MSVC's implementation of the C++ Standard Library.