jFransham

Achieving warp speed with Rust

Contents:

• Number one optimization tip: don't
• Never optimize blindly
• Don't bother optimizing one-time costs
• Improve your algorithms
• CPU architecture primer
• Keep as much as possible in cache
• Keep as much as possible in registers

mowings

#!/bin/bash
interfaces=( $(netstat -in | egrep 'utun\d .*\d+\.\d+\.\d+\.\d+' | cut -d ' ' -f 1) )
rulefile="rules.tmp"
echo "" > $rulefile
sudo pfctl -a com.apple/tun -F nat
for i in "${interfaces[@]}"
do
  RULE="nat on ${i} proto {tcp, udp, icmp} from 192.168.64.0/24 to any -> ${i}"
  echo $RULE >> $rulefile
done

kripken

int doubler(int x) {
  return 2 * x;
}

Rich-Harris

Stuff I wish I'd known sooner about service workers

I recently had several days of extremely frustrating experiences with service workers. Here are a few things I've since learned which would have made my life much easier but which isn't particularly obvious from most of the blog posts and videos I've seen.

I'll add to this list over time – suggested additions welcome in the comments or via twitter.com/rich_harris.

Use Canary for development instead of Chrome stable

Chrome 51 has some pretty wild behaviour related to console.log in service workers. Canary doesn't, and it has a load of really good service worker related stuff in devtools.

jart

# -*- mode:python; -*-
#
# Copyright 2016 The Bazel Authors. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#

paulirish

What forces layout / reflow

All of the below properties or methods, when requested/called in JavaScript, will trigger the browser to synchronously calculate the style and layout*. This is also called reflow or layout thrashing, and is common performance bottleneck.

Generally, all APIs that synchronously provide layout metrics will trigger forced reflow / layout. Read on for additional cases and details.

Element APIs

Getting box metrics

• elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent

tmacedo

diff -Naur a/drivers/hid/hid-apple.c b/drivers/hid/hid-apple.c
--- a/drivers/hid/hid-apple.c     2014-12-07 23:21:05.000000000 +0100
+++ b/drivers/hid/hid-apple.c     2015-04-16 16:18:35.009726041 +0200
@@ -535,6 +535,8 @@
        { HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_WELLSPRING7_JIS),
                .driver_data = APPLE_HAS_FN | APPLE_RDESC_JIS },
        { HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_WELLSPRING7A_ANSI),
+               .driver_data = APPLE_HAS_FN },
+       { HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_WELLSPRING7A_NEW),
                .driver_data = APPLE_HAS_FN },

cargo-up

#!/bin/sh

set -e

function update_version {
  semver="$1"

  sed -i "s/^version = \".*\"\s\+#:version$/version = \"$semver\"  #:version/g" Cargo.toml
  if git ls-files Cargo.lock --error-unmatch > /dev/null 2>&1; then
    cargo update

jimmycuadra

#cloud-config

coreos:
  etcd:
    # generate a new token for each unique cluster from https://discovery.etcd.io/new
    discovery: https://discovery.etcd.io/<token>
    # multi-region deployments, multi-cloud deployments, and droplets without
    # private networking need to use $public_ipv4
    addr: $private_ipv4:4001
    peer-addr: $private_ipv4:7001

cuviper

$ uname -a
Linux laptop 3.10.0-123.13.2.el7.x86_64 #1 SMP Fri Dec 12 19:51:03 EST 2014 x86_64 x86_64 x86_64 GNU/Linux
$ rustc -Vv
rustc 1.0.0-alpha (44a287e6e 2015-01-08 17:03:40 -0800)
binary: rustc
commit-hash: 44a287e6eb22ec3c2a687fc156813577464017f7
commit-date: 2015-01-08 17:03:40 -0800
host: x86_64-unknown-linux-gnu
release: 1.0.0-alpha
$ cat hello.rs