alifarazz

On an Intel i7-13620H, running Linux 6.15.2 and gcc 15.1.1 without sanitizers:

$ ./umonitor-umwait-semaphore
Semaphore initialized with count = 5.
Spawning 18 worker threads...

Main thread: Releasing an additional permit after some time.

All workers finished.

alifarazz

• How to compile:

  • $ g++ -DBIG_INPUT -Ofast -mtune=native -march=native -pipe -funroll-loops -Wall -Wextra -Wcast-align -Wchar-subscripts -Wshadow -Wunused dijkstra.cc -o dijkstra -flto
    or
  • $ clang++ -stdlib=libc++ -DBIG_INPUT -Ofast -mtune=native -march=native -funroll-loops -Wall -Wextra -Wcast-align -Wchar-subscripts -Wshadow -Wunused dijkstra.cc -o dijkstra -flto

• Results on a Intel Core i7-13620H, compiled with gcc, with 1024x1024 input:

  $ numactl --physcpubind=2 hyperfine -N -i -w 30 -r 100 './dijkstra'
  Benchmark 1: ./dijkstra

Time (mean ± σ): 3.2 ms ± 0.0 ms [User: 2.9 ms, System: 0.3 ms]

alifarazz

# in $HOME/.config/tmux/tmux.conf
# set-option -g default-shell "path to fish"
# I copied most of this off someone's blog.

# # remap prefix from 'C-b' to 'C-a'
# unbind C-b
# set-option -g prefix C-a
# bind-key C-a send-prefix

# split panes using | and -

alifarazz

#!/usr/bin/env bash

set -euEo pipefail
set -x  # show every command being executed

##### Constants
remote_path_prefix="nesaean:/project/ali"  # Remote ssh server is set in my ~/.ssh/config
watcher_match_regex=".*\.(cu|cc|hh|bash|md|c|h|inc)"  # Only watch for file paths matching regex

##### Process argv

alifarazz

// g++ -std=c++20 cpu_burn.cc -o cpu_burn

#include <bits/stdc++.h>

constexpr size_t maxn = 192;
constexpr int iter = 1024 * 1024;

std::array<std::jthread, maxn> threads;
std::array<unsigned int, (1024ull * 1024 * 512)> data;

alifarazz

#define _GNU_SOURCE

#include <linux/prctl.h> /* Definition of PR_* constants */
#include <sys/prctl.h>

#include <sys/syscall.h> /* for __NR_write */
#include <ucontext.h>    /* REG_RBP, REG_RSP */
#include <unistd.h>      /* for write(2) */

#include <assert.h>

alifarazz

// g++ -O3 -Wall -Wextra -Wconversion -Wshadow -Wpedantic -std=c++20 -march=alderlake umwait.cc -o umwait.elf
// ./umwait.elf or ./umwait.elf w
#include <atomic>
#include <iostream>
#include <latch>
#include <thread>

#include <immintrin.h>
#include <x86intrin.h>

alifarazz

#include <cstdio>

int f(int *ap, float *bp) {
  *ap = 1;
  *bp = 2.0f;
  return *ap;
}

int main() {
  int a = 0; float b = 0.0f;

alifarazz

CMake All Variable Dump

Put this wherever you'd want to dump the variables from.

message("=============BEGIN VARIABLE DUMP ========================")
get_cmake_property(_variableNames VARIABLES)
foreach (_variableName ${_variableNames})
    message("${_variableName}=${${_variableName}}")
endforeach()
message("=============END VARIABLE DUMP ==========================")

alifarazz

[alias]
	kosdast = git add .
	co = checkout
	br = branch
	pu = push --tags
	puff = push --force-with-lease
	st = status --branch
	ci = commit
	ca = commit --amend
	can = commit --amend --no-edit