hashbrowncipher

#!/usr/bin/fakeroot /bin/bash
set -o errexit
set -o nounset
set -o pipefail
OUTFILE=$2.squashfs
TMPDIR=$(mktemp -d -p .)

cleanup() {
  rm -fr $TMPDIR
}

hashbrowncipher

from fractions import Fraction as f


def factors_of_two(n):
    return n & ~(n - 1)


def _tokens_slice(count, zones):
    # We cannot have zones be a multiple of two and also have tokens with
    # equal spacing from each other.

hashbrowncipher

@contextmanager
def atomic_temporary_file(destination, *, mode="w+b", flags=0, **kwargs):
    fd = os.open(destination.parent, os.O_TMPFILE | os.O_RDWR | flags)
    with io.open(fd, mode, **kwargs) as fh: 
        yield fh
        os.link("/proc/self/fd/{}".format(fd), str(destination), src_dir_fd=0)

hashbrowncipher

#include <arpa/inet.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <time.h>
#include <unistd.h>
#include <sys/resource.h>

hashbrowncipher

$ sudo -u cassandra jstat -gcutil $(pgrep -f Cassandra) 100ms
S0     S1     E      O      M     CCS    YGC     YGCT    FGC    FGCT     GCT
0.00 100.00 100.00 100.00  97.96  95.10     21    8.678    11  140.498  149.176
0.00 100.00 100.00 100.00  97.96  95.10     21    8.678    11  140.498  149.176
0.00 100.00 100.00 100.00  97.96  95.10     21    8.678    11  140.498  149.176

hashbrowncipher

#!/bin/bash
# Depends on zstd (>1.3.6) and aws-cli
set -o errexit
set -o nounset
set -o pipefail

# Set kernel.core_pattern = | coredump_uploader.sh %P %s %E
PID=$1
shift
SIGNAL=$1

hashbrowncipher

from botocore.session import Session

credentials_cache = dict()

class Session(Session):
    def __init__(self, role_arn, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self._config = dict(
            profiles=dict(
                default=dict(

hashbrowncipher

from aiohttp.client_exceptions import ClientError
import asyncio
from asyncio import Queue
from aiohttp.resolver import AsyncResolver
import json
import os
import random
from blake3 import blake3
from hashlib import md5
from socket import socketpair

hashbrowncipher

josh@ubuntu:~/hasher$ dd if=/dev/zero bs=65536 count=16384 | ./xxHash/xxh128sum 
16384+0 records in
16384+0 records out
16024760318c6298efd1151033ad2e9f  stdin
1073741824 bytes (1.1 GB, 1.0 GiB) copied, 0.23966 s, 4.5 GB/s
josh@ubuntu:~/hasher$ dd if=/dev/zero bs=65536 count=16384 | ./a.out 
16384+0 records in
16384+0 records out
1073741824 bytes (1.1 GB, 1.0 GiB) copied, 0.210685 s, 5.1 GB/s
16024760318c6298efd1151033ad2e9f

hashbrowncipher

- This run was on a c5.large which had been booted up before
- Set MODULES=dep in /etc/initramfs-tools/initramfs.conf
- Deleted a bunch of initramfs-tools hooks, including especially: iscsi mdadm lvm2
- Removed a bunch of stock ubuntu services
  * snapd
  * ec2-instance-connect
  * cryptsetup-initramfs
  * udisks2
  * unattended-upgrades
  * plymouth