hotspot
sanitizers
hotspot | sanitizers | |
---|---|---|
16 | 48 | |
3,874 | 10,826 | |
1.4% | 1.3% | |
9.3 | 6.3 | |
3 days ago | 13 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
-
What is your favourite profiling tool for C++?
perf with Hotspot π
-
Profiling C code on an M1 mac
If youβre able to use perf on Linux, I would recommend hotspot for visualizing the results.
-
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.
-
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`.
-
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.
-
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.
-
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/
-
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.
sanitizers
-
Good resources for learning C in depth?
AddressSanitizer is really useful, it's similar to Valgrind but has much lower overhead.
-
Memory Allocators
And if you're up for it, I'd further recommend adding some ways to deal with buffer overflows in debug builds. The way I deal with this is by using Address-Sanitizer's manual poisoning api. Bonus point if you leave additional poisoned space between allocations so off by one errors are likely to end up in a poisoned region instead of nearby allocation.
- Exception thrown: write access violation
-
2023 Stack Overflow Survey: Rust is the most admired programming language, making it the most loved language for 8 years in a row
It also doesn't hurt that Miri can find many kinds of unsafe violations even in unsafe blocks. Zig may get something like this one day, but even if it does, checking things at runtime is not a substitute for compile time -- the C++ Sanitizers haven't exactly solved the safety story for C++ even over a decade later.
-
What's the best thing you've found in code? :
This is where stuff like ASan is really useful.
-
how do I check my library for memory leaks?
Use: https://github.com/google/sanitizers/wiki/AddressSanitizer
-
Is malloc_trim() safe to use?
Have you tried using tools like ASAN/LSAN or valgrind to confirm that there are indeed no memory leaks?
-
Having trouble with projects too long to post here.
Compile with ASAN and UBSAn
- Strange Segmentation Fault when accessing a Class inside a for loop.
- Will Carbon Replace C++?
What are some alternatives?
FlameGraph - Stack trace visualizer
miri - An interpreter for Rust's mid-level intermediate representation
polkit-dumb-agent - a polkit agent in 145 lines of code, because polkit is dumb and none of the other agents worked
spdlog - Fast C++ logging library.
firestorm - A fast intrusive flamegraph
xeus-cling - Jupyter kernel for the C++ programming language
gta5view - Open Source Snapmatic and Savegame viewer/editor for GTA V
plotters - A rust drawing library for high quality data plotting for both WASM and native, statically and realtimely π¦ ππ
cargo-flamegraph - Easy flamegraphs for Rust projects and everything else, without Perl or pipes <3
Catch - A modern, C++-native, test framework for unit-tests, TDD and BDD - using C++14, C++17 and later (C++11 support is in v2.x branch, and C++03 on the Catch1.x branch)
optick-rs - Optick for Rust
doctest - The fastest feature-rich C++11/14/17/20/23 single-header testing framework