Ivica Bogosavljevic @i_bogosavljevic
C/C++ Performance Engineer. I help developer teams make their codes faster :) Performance blog: https://t.co/tZjWN8ZwHP. Consulting: https://t.co/t08CgtvaCb johnnysswlab.com Belgrade, Serbia Joined January 2021-
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I heard of some "lock data in L3 cache" API in intel about a year ago. Esentially you give a pointer, and a pointer size, and the CPU makes the data in this range never leaves L3 cache. Does this exist or was I hallucinating?
What is the fastest compression algorithm (the level of compression is not important, only the speed)?
Colleagues think I'm an expert w/the perf tool. HA! I can't tell you how often I've stumbled upon new perf functionality that I had no idea existed (for YEARS in some cases). For example, check out this one: pramodkumbhar.com/2024/04/linux-…
We investigate explicit software prefetching, a mechanism software developers can use to prefetch the data in advance so it is ready once the program needs it. johnnysswlab.com/the-pros-and-c…
Today I learned that if you have a .so library built from smaller .a libraries, none of the symbols from .a libraries get exported as part of the .so library.
The female form of "scrum master" is "scrum mistress".
Russian presidential elections finished yesterday. Out of all people who voted in the Russian consulate in Serbia, 3% voted for Putin.
A story of a very large loop with a long instruction dependency chain! johnnysswlab.com/a-story-of-a-v…
Does the compiler ever get overwhelmed with code complexity and decide "I can't keep up with this, I am stopping optimizations and just spitting up simple unoptimized code"?!
In all the projects I worked on, at some point Jenkins becomes the point of contention.
How to avoid register spilling in vectorized code with many constants? johnnysswlab.com/on-avoiding-re…
When I ask ChatGPT something and it gives me an answer that is correct and on the point, I feel a need to tell it "Thanks a lot". And then it says "Happy coding". So well mannered.
We investigate the unusual way memory subsystem interacts with branch prediction and how this interaction shapes software performance. johnnysswlab.com/unexpected-way…
We investigate how the memory subsystem behaves in an environment where several threads compete for memory subsystem resources and cover techniques used to improve the performance of multithreaded codes. johnnysswlab.com/multithreading…
First time I am seeing the compiler proposing to add a missing statement. In the context of overloading operator=, I forgot to add return *this, so the compiler told me what to do. Bravo GCC!
What are the most unexpected vectorizations that you did or heard of? For me it is probably copy_if vectorization and flooding algorithm vectorization. I am curious what other people are doing?
Intel against manual loop unrolling. source: intel.com/content/www/us…
Meeting C++ @meetingcpp
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4K Followers 427 Following Engineering director at Facebook. Interested in systems, compilers, ML, performance, and other stuff. 🇮🇱
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Phoronix @phoronix
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@i_bogosavljevic No, you're not hallucinating. It's part of the Intel Resource Director family of features called "Cache Pseudo Locking". The Linux kernel supports it, as well. I've never used it personally because the HFT game is won or lost in the L1d anyway🤷🏾♂️
@i_bogosavljevic Something like this "7.6.6 L3 Cache Range Reservation" amd.com/content/dam/am… ?
@dyaroshev @i_bogosavljevic Actually it’s an interesting question, if you can perform some lightweight compression, you can write less data, so you could potentially be faster than memcpy since you’ll probably be memory bound anyway.
@i_bogosavljevic I used google-snappy for in-memory compression, it's really fast. github.com/google/snappy
I just made llamafile 1.3x - 5x faster than llama.cpp on CPU for many prompt / image evaluation use cases and hardware. justine.lol/matmul/
@iiirogers One of the proudest moments in the 4yr existence of my consulting business is one of my Company Tech Blog articles making it onto this wiki😊
Sometimes it is hard to determine the impact of a potential slow function because it is hard to optimize. Making it slower on purpose can be useful to figure out if that function matters that much.
🎉Yay! Performance Ninja has reached 2000 stars on Github! #perfninja #performance
🎉Yay! Performance Ninja reached 1000 stars on Github! Thanks to everyone who supports the project! #perfninja #performance
Starting with C++, Tip 1 When starting with C++, learn about the following topics in the following order: 1. The C++ language basics 2. The C++ Standard Library basics 3. Modern C++ standards features #cplusplus
@kobi_ca A prominent engineer once taught me a tao of select-all-then-delete. I couldn’t tell if that person was joking or not. So when I came to a point of breakdown, I took that recipe once to save myself. It worked. Nothing bad happened.
@i_bogosavljevic @pshufb Rust has that as well, just better hidden ;)
The "Timed LBR" feature on Intel CPUs is just so. . . I mean. . . it. . . completes me😍
"I’ve come to believe that upward social mobility shouldn’t be our priority as a society. Rather, upward mobility should be the side effect of far more important things: family, stability, and emotional security for children. Even if upward mobility were the primary goal, a safe…
I don't typically post Job Openings here. But several of my PerfEng brethren have asked about breaking into the HFT industry, where pay is phenomenal & the security is much better than elsewhere in the IT industry. Check it out: xtxmarkets.com/career/ml-engi…
@PeterVeentjer ILP in code not written for it may not get a lot better, but if you deliberately write your code to have multiple independent dependency chains, with 16 regs it's easy to start spilling after just a few chains. It's like having 4 threads that only have 4 registers.
February the 29th seems like a pretty good day to release a new book.
I wrote a 10-page section about Memory Profiling for the second edition of my book. I published it on my blog to collect feedback from you. easyperf.net/blog/2024/02/1… What do you think?
If you say you are a 10x programmer, you obviously aren't. Great programmers would clearly be either 8x or 16x.
Recording of my 2023 talk: "Advance SIMD Algorithms in Pictures" I show how to do memcmp, copy_if, set_intersection and sort. If you have a question, I can answer. youtu.be/vGcH40rkLdA?si…
Our job at Red Pen Reviews is not to cater to peoples’ beliefs about nutrition, nor is it to cater to social media outrage. Our job is to get as close to the truth as possible. We understand that some people are not going to like what we say, and that's OK.
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