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For years, people have been using jemalloc with ruby. There were various benchmarks and discussions. Legend had it that Jemalloc 5 didn't work as well as Jemalloc 3.

Then, one day, hope appeared on the horizon. @wjordan offered a config for Jemalloc 5.

Ubuntu/Debian

FROM ruby:3.1.2-bullseye
RUN apt-get update ; \

hi, i'm daniel. i'm a 15-year-old high school junior. in my free time, i hack billion dollar companies and build cool stuff.

3 months ago, I discovered a unique 0-click deanonymization attack that allows an attacker to grab the location of any target within a 250 mile radius. With a vulnerable app installed on a target's phone (or as a background application on their laptop), an attacker can send a malicious payload and deanonymize you within seconds--and you wouldn't even know.

I'm publishing this writeup and research as a warning, especially for journalists, activists, and hackers, about this type of undetectable attack. Hundreds of applications are vulnerable, including some of the most popular apps in the world: Signal, Discord, Twitter/X, and others. Here's how it works:

Cloudflare

By the numbers, Cloudflare is easily the most popular CDN on the market. It beats out competitors such as Sucuri, Amazon CloudFront, Akamai, and Fastly. In 2019, a major Cloudflare outage k

Change Log

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog and this project adheres to Semantic Versioning.

[Unreleased] - yyyy-mm-dd

Here we write upgrading notes for brands. It's a team effort to make them as

Garbage collection with zero cost at non-GC time

Every once in a while I investigate low-level backend options for PL-s, although so far I haven't actually written any such backend for my projects. Recently I've been looking at precise garbage collection in popular backends, and I've been (like on previous occasions) annoyed by limitations and compromises.

I was compelled to think about a system which accommodates precise relocating GC as much as possible. In one extreme configuration, described in this note, there

Howto Install clamav on OSX with brew

Note: on legacy intel system the path may be /usr/local/etc/clamav instead of /opt/homebrew/etc/clamav/

$ brew install clamav
$ cd /opt/homebrew/etc/clamav/
$ cp freshclam.conf.sample freshclam.conf

	-- Temporary file usage by database
	SELECT datname AS "database", temp_files AS "Temporary files", temp_bytes
	AS "Size of temporary files"
	FROM pg_stat_database;

	-- Cache Hit Ratio. Anything greater than 90% is always good
	SELECT sum(blks_hit)*100/sum(blks_hit+blks_read) AS hit_ratio FROM pg_stat_database;

	-- Top Queries
	SELECT substr(query, 0, 250), calls,


	const NEW_CHARMAP = "\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f\x20!\"#$%&'{([])}*+-.\\/0123456789:;,<=>?@EeAaUuOoIiFfGgHhJjLl\|WwMmNnBbDdTtPpQqRrKkCcSsZzVvXxYy^_`~";
	function get_new_char_code(old_char_code){
	return NEW_CHARMAP.indexOf(String.fromCharCode(old_char_code));
	}
	function get_old_char_code(new_char_code){
	return NEW_CHARMAP.charCodeAt(new_char_code);
	}

	FROM ubuntu:20.04

	WORKDIR /radminvpn

	# Update package lists and install required packages
	RUN apt-get update && \
	apt-get install -y wget software-properties-common gnupg2 winbind xvfb x11vnc

	# Add Wine repository and install Wine
	RUN dpkg --add-architecture i386 && \

	FROM ubuntu:20.04

	# Specify a workdir, to better organize your files inside the container.
	WORKDIR /radminvpn

	# Update package lists and install required packages
	RUN apt-get update && \
	apt-get install -y wget software-properties-common gnupg2 winbind xvfb

	# Add Wine repository and install Wine