I've written a naive and an "optimized" transpose functions for order-3 tensors containing double-precision complex numbers and I would like to analyz ...
I've written a naive and an "optimized" transpose functions for order-3 tensors containing double-precision complex numbers and I would like to analyz ...
I don't quite understand the bandwidth factor in roofline models described in Wikipedia (like the pic and its caption shown below): why the inters ...
I am trying to understand microarchitecture. When an operating system schedules code to run on a CPU hardware thread (as in Intel HyperThreading), ca ...
Consider Graviton3, for example. It's a 64-core CPU with per-core caches 64KiB L1d and 1MiB L2. And a shared L3 of 64MiB across all cores. The RAM ban ...
I am trying to use linux perf to profile the L3 cache bandwidth gor a python script. I see that there are no available commands to measure that direct ...
I'm trying to measure the write bandwidth of my memory, I created an 8G char array, and call memset on it with 128 threads. Below is the code snippet. ...
I'm creating an int (32 bit) vector with 1024 * 1024 * 1024 elements like so: which holds 4 GB of random data at that point. And then I'm simply su ...
I have read that when accessing with a stride both loops should perform similarly, as memory accesses are in a higher order than multiplication. I ...
I'm trying to optimize 2d matrix addition in C using SIMD instructions (_mm256_add_pd, store, load, etc.). However, I'm not seeing a large speedup at ...
Summary: I'm trying to write a memory bound OpenCL program that comes close to the advertised memory bandwidth on my GPU. In reality I'm off by a fac ...
I want to apply a polynomial of small degree (2-5) to a vector of whose length can be between 50 and 3000, and do this as efficiently as possible. Exa ...
I have a problem that is memory bandwidth limited -- I need to read a lot (many GB) of data sequentially from RAM, do some quick processing and write ...
A few years back, NVIDIA's Mark Harris posted this: An Efficient Matrix Transpose in CUDA C/C++ in which he described how to perform matrix transpos ...
I've been working on a Deep Learning Library writing on my own. In matrix operations, getting the best performance is a key for me. I've been research ...
I just noticed a pieces of my code exhibit different performance when copying memory. A test showed that a memory copying performance degraded if the ...
I'm trying to figure out memory access time of sequential/random memory read/write. Here's the code: #include <assert.h> #include <stdio.h&g ...
I'm testing the memory bandwidth on a desktop and a server. The peak bandwidth of the system is I'm using my own triad function from STREAM to m ...
I have a few questions on STREAM (http://www.cs.virginia.edu/stream/ref.html#runrules) benchmark. Below is the comment from stream.c. What is the ...
Is there any possible optimization for random access on a very big array (I currently use uint8_t, and I'm asking about what's better) when the val ...
Can the Intel PMU be used to measure per-core read/write memory bandwidth usage? Here "memory" means to DRAM (i.e., not hitting in any cache level). ...