Ivan Prisyazhnyy sitano

unsigned integers

-O3

|               ns/op |                op/s |   MdAPE | benchmark
|--------------------:|--------------------:|--------:|:----------------------------------------------
|                3.03 |      329,748,861.72 |    3.2% | `(a + b) / 2`
|                3.01 |      332,744,047.95 |    4.1% | `a + ((b - a) / 2)`
|                3.01 |      331,690,526.09 |    2.3% | `A/2 + B/2 + (A & B & 1)`
|                3.13 |      318,986,706.11 |    2.3% | `std::midpoint()`

Pick a scylla version: https://hub.docker.com/r/scylladb/scylla/tags

This tuturial was created with 3.1.0.rc9 on Linux

Create a docker container with scylla

Docker Documentation

docker run --name scylla-si -d scylladb/scylla:3.1.0 --smp 2 --memory 4G

Warning - use at your own risk

Remove SentinelOne agent from Mac

Boot into Recovery Mode by holding Cmd+R during reboot
Open Terminal from top menubar
Run /Applications/Utilities/Disk\ Utility.app/Contents/MacOS/Disk\ Utility to open Disk Utility
If your startup disk is encrypted, use Disk Utility to mount it
In Terminal, run chroot /Volumes/Macintosh\ HD
Execute the deletion commands or script

О специальной олимпиаде Haskell vs Python (pypy) vs всё остальное

Первоначально задача возникла в https://t.me/haskellru и формулировалась примерно так: почему следующий код на Haskell

using rust with rr

rr is a great debugging tool. it records a trace of a program's execution, as well as the results of any syscalls it executes, so that you can "rewind" while you debug, and get deterministic forward and reverse instrumented playback. it works with rust, but by default if you try it out, it could be pretty ugly when you inspect variables. if this bothers you, configure gdb to use a rust pretty-printer

rr is probably in your system's package manager.

	#!/usr/bin/env bash

	# Usage: sudo ./restore_functionality.sh

	#ps aux \| grep sentinel \| awk -F " +" '{print $2}' \| xargs kill
	while true; do
	launchctl kill SIGKILL system/com.crowdstrike.falcond
	launchctl kill SIGKILL system/com.crowdstrike.userdaemon
	launchctl kill SIGKILL system/com.sentinelone.sentineld
	launchctl kill SIGKILL system/com.sentinelone.sentineld-helper

	knowledge dump on container runtimes

	KataContainers
	- image coupled with kernel
	- light vm layer
	- can run in nested virturalization environments if hardware supports and you can enable it in bios (ex. only bare metal EC2 instances, limits many cloud providers)
	- slower startup time
	- OCI compliant
	- previously known as ClearContainers by Intel

	=begin
	This script attempts to reproduce poor glibc allocator behavior within Ruby, leading
	to extreme memory fragmentation and process RSS bloat.

	glibc allocates memory using per-thread "arenas". These blocks can easily fragment when
	some objects are free'd and others are long-lived.

	Our script runs multiple threads, all allocating randomly sized "large" Strings between 4,000
	and 40,000 bytes in size. This simulates Rails views with ERB creating large chunks of HTML
	to output to the browser. Some of these strings are kept around and some are discarded.

	#!/usr/bin/python
	# to try this you'll need to edit in the name of your ruby binary and install bcc-tools
	# bcc installation instructions are at https://github.com/iovisor/bcc/blob/master/INSTALL.md

	from __future__ import print_function
	from bcc import BPF
	from time import sleep
	import os

	# load BPF program