Viewing profile — dsharlet

I can agree with the skeptics that LLM generated code is usually crap. I rarely accept its output without significant edits unless it's truly boilerplate, and I want to avoid the n…

Yes I am, you can reach me at dsharlet@gmail.com

BLIS doesn't appear to support SME: https://github.com/search?q=repo%3Aflame%2Fblis+mopa&type=co... Maybe you want a comparison anyways, but it won't be competitive. On Apple CPUs,…

The problem I've seen is this: in order to get good performance, no matter what language you use, you need to understand the hardware and how to use the instructions you want to us…

I wrote a library in C++ (I know, probably a non-starter for most reading this) that I think does most of what you want, as well as some other requests in this thread (generalized …

I dunno man. My claim was that for specific cases with unique properties, it's not hard to beat BLAS, without getting too exotic with your code. BLAS doesn't have routines for mult…

BLAS is getting almost exactly 100% of the theoretical peak performance of my machine (CPU frequncy * 2 fmadd/cycle * 8 lanes * 2 ops/lane), it's not slow. I mean, just look at the…

The makefile asks for -O2 with clang. I find that -O3 almost never helps in clang. (In gcc it does.) Here's what I see: $ clang++ --version clang version 18.0.0 $ time make bin/mat…

I should have mentioned somewhere, I disabled threading for OpenBLAS, so it is comparing one thread to one thread. Parallelism would be easy to add, but I tend to want the thread p…

This gets to 90% of BLAS: https://github.com/dsharlet/array/blob/38f8ce332fc4e26af0832... The less involved versions still get ~70%. But this is also quite general. I’m claiming yo…

This is really overstating how hard it is to compete with matrix multiply libraries. The main reason those libraries are so big and have had so much work invested in them is their …

I think for a compiler it makes sense to focus on small matrix multiplies, which are a building block of larger matrix multiplies anyways. Small matrix multiplies emphasize the com…

I tried it out and compared it to C++ at the last release. Here was what I found: https://github.com/dsharlet/mojo_comments Some of the issues I pointed out there are pretty low ha…

I don't think it's true at all, you can just write C/C++ with SIMD intrinsics, just like you can on ARM or x86, and the instruction set is mostly awesome. OpenCL would just be an e…

> The only case I can currently fore see where using LMUL=1 and manually unrolling instead will likely be always beneficial is vrgather operations that don't need to cross between …

If you are looking for something like this in C++, here's my attempt at implementing it: https://github.com/dsharlet/array#einstein-reductions It doesn't do any automatic optimizat…

Compilers can be pretty good if you help them out a bit. Here's my implementation of Einstein reductions (including summations) in C++, which generate pretty close to ideal code un…

Funny you mention SPICE to VST compilation... It was on my list for this (my) side project but I never got around to it: http://livespice.org/ edit: And a Tubescreamer is one of th…

> which introduces some frequency/phase distortion I agree with everything you said here, except this. Can you explain this? Why does oversampling introduce distortion?

The rest of the post after the question mark you stopped reading at: > Filesystem corruption is frequently silent, and every-time it happens customers don't get on the phone and se…

In my experience, GPS doesn't work well when the device is in a pack or even a thick jacket. Also, batteries don't work well in the cold. Combine those two things, it's hard to get…

> That hundreds of millions of users took years to notice should be an indication this whole thing worked pretty well IMO. People absolutely have been noticing, this has been a ver…

TP-link is clearly ignoring many of the instructions from NTP: http://www.pool.ntp.org/vendors.html Notably, they are ignoring the ones that make it possible for NTP to be aware of…

Of all of the companies you listed, only Comcast needed to obtain the right to dig a trench through much of the private and public property in America prior to doing business. In e…