theStack

# Running Bitcoin Core on an emulated 32-bit ARM system using qemu (for reproducing issue #28906 and testing the fix PR #28913)
# guide based on https://translatedcode.wordpress.com/2016/11/03/installing-debian-on-qemus-32-bit-arm-virt-board/
# tested on Ubuntu 22.04 LTS

$ sudo apt-get install qemu-system-arm libguestfs-tools
$ wget -O installer-vmlinuz http://http.us.debian.org/debian/dists/bookworm/main/installer-armhf/current/images/netboot/vmlinuz
$ wget -O installer-initrd.gz http://http.us.debian.org/debian/dists/bookworm/main/installer-armhf/current/images/netboot/initrd.gz
$ qemu-img create -f qcow2 myarmdisk.qcow2 80G
$ qemu-system-arm -M virt -m 2048 -kernel installer-vmlinuz -initrd installer-initrd.gz \
    -drive if=none,file=myarmdisk.qcow2,format=qcow2,id=hd \

imneme

/*
 * Random-Number Utilities (randutil)
 *     Addresses common issues with C++11 random number generation.
 *     Makes good seeding easier, and makes using RNGs easy while retaining
 *     all the power.
 *
 * The MIT License (MIT)
 *
 * Copyright (c) 2015-2022 Melissa E. O'Neill
 *

jboner

Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD