ghishadow

PostgreSQL is Enough

See the new site: https://postgresisenough.dev

---

• Simplify: move code into database functions
• Just Use Postgres for Everything
• Just use Postgres
• PostgreSQL is the worlds’ best database

ghishadow

MiniPerf

Example of how to capture CPU counters with ETW on Windows, perf on Linux or kperf on Apple.

Using ETW needs somewhat recently updated Windows 10 or 11. Not sure about exact version.

Currently tested on:

• etw on Qualcomm Snapdragon X Elite, Windows 11, arm64
• etw on AMD Zen 3, Windows 11 (with virtualization enabled in BIOS)

ghishadow

vsock notes

about vsocks

Vsocks are a means of providing socket communication (either stream or datagram) directly between VMs and their host operating system. The host and each VM have a 32 bit CID (Context IDentifier) and may connect or bind to a 32 bit port number. Ports < 1024 are privileged ports.

• Vsock communication between VMs does not seem to work.
• Only one vsock device per VM is supported.

ghishadow

@Echo off
setlocal EnableDelayedExpansion
set 1=auto
set 2=off
set 3=exit
Echo/
echo "    __    __                                                  __     __       ";
echo "   /  |  /  |                                                /  |   /  |      ";
echo "   $$ |  $$ | __    __   ______    ______    ______          $$ |   $$ |      ";
echo "   $$ |__$$ |/  |  /  | /      \  /      \  /      \  ______ $$ |   $$ |      ";

ghishadow

"""
The most atomic way to train and inference a GPT in pure, dependency-free Python.
This file is the complete algorithm.
Everything else is just efficiency.

@karpathy
"""

import os       # os.path.exists
import math     # math.log, math.exp

ghishadow

original url - https://www.facebook.com/notes/daniel-colascione/buttery-smooth-emacs/10155313440066102/

Buttery Smooth Emacs

30 October 2016

Public Emacs has flickered for 30 years. Now, it should be flicker-free. I’ve just landed support for double-buffered rendering for the X11 port. Now you should be able to edit, resize, and introduce bugs in your awful codebase without seeing a partially-rendered buffer or being incited to murder by barely-perceptible white flashes while editing that

ghishadow

/*
 *   File:   fanotify-example.c
 *   Date:   Fri Nov 15 14:55:49 2013
 *   Author: Aleksander Morgado <aleksander@lanedo.com>
 *
 *   A simple tester of fanotify in the Linux kernel.
 *
 *   This program is released in the Public Domain.
 *
 *   Compile with:

ghishadow

#!/usr/bin/env bash

# Default values for percentages
DEFAULT_WIRED_LIMIT_PERCENT=85
DEFAULT_WIRED_LWM_PERCENT=75

# Read input parameters or use default values
WIRED_LIMIT_PERCENT=${1:-$DEFAULT_WIRED_LIMIT_PERCENT}
WIRED_LWM_PERCENT=${2:-$DEFAULT_WIRED_LWM_PERCENT}

ghishadow

Performance Engineering, Hardware and cache awareness with algorithm and data structures

1. Parallel Computing Course - Stanford CS149, Fall 2023
2. Performance-Aware Programming Series by Casey Muratori
3. Algorithms for Modern Hardware
4. Computer Systems: A Programmer's Perspective, 3/E - by Randal E. Bryant and David R. O'Hallaron, Carnegie Mellon University
5. Performance Engineering Of Software Systems - am MITOCW course
6. Parallel Programming 2020 by NHR@FAU
7. Cpu Caches and Why You Care - by Scott Meyers
8. [Optimizing a ring buffer for throughput](https://rig

ghishadow

Google Public NTP [AS15169]:

time.google.com

time1.google.com

time2.google.com

time3.google.com