igrr

/*
 * This sample illustrates how to go back to deep sleep from the
 * deep sleep wake stub.
 *
 * Consider the use case of counting pulses from an external sensor,
 * where the pulses arrive at a relatively slow rate.
 *
 * ESP32 is configured to go into deep sleep mode, and wake up from
 * a GPIO pin connected to the external pulse source.
 * Once the pulse arrives, ESP32 wakes up from deep sleep and runs

KodrAus

Profiling performance

Using perf:

$ perf record -g binary
$ perf script | stackcollapse-perf.pl | rust-unmangle | flamegraph.pl > flame.svg

NOTE: See @GabrielMajeri's comments below about the -g option.

Brainiarc7

Streaming your Linux desktop to Youtube and Twitch via Nvidia's NVENC and VAAPI:

Considerations to take when live streaming:

The following best practice observations apply when using a hardware-based encoder for live streaming to any platform:

1. Set the buffer size (-bufsize:v) equal to the target bitrate (-b:v). You want to ensure that you're encoding in CBR mode.

2. Set up the encoders as shown:

dumbbell

Bootstrapping Rust and Cargo on FreeBSD/aarch64

At the time of this writing, Rust and Cargo are available on FreeBSD/amd64 and FreeBSD/i386 only, whether it is from rustup or from the FreeBSD ports tree. Here is how I could bootstrap Rust and Cargo for FreeBSD/aarch64 from FreeBSD/amd64.

Base system for the target

To be able to cross-compile anything, you need a userland for the target.

From a release

bobzhang

A list of languages which compile to JS (Elm, Purescript, OCaml)
(Inspired by this thread: https://groups.google.com/forum/#!topic/elm-discuss/Um7WIBTq9xU)
They all support curry calling convention by default.

Some interesting results:

1. `min` is curried function, only OCaml(BuckleScript) managed to optimize this overhead.
2. All optimize the self tail call
3. Only BuckleScript and PureScript type-specialized comparison functoin (>=) and inlined

prash-wghats

Copy all the files to the build directory.
Copy icudtl.dat to the build directory. (you can find it in the vscode downloads ex for linux).
chromium version in port is 52.0.2743.116.
This was built with FreeBSD 11.0-RELEASE-p1. If building with other versions probably need to change
the freebsd versions in diff files (ex. freebsd11 => freebsd10)
Installed 
node => v6.9.1
npm => 3.9.2

>chmod 755 vscode_build.sh

Yamakaky

#!/usr/bin/sed -rf
# Unmangle Rust symbols
# See https://git.kernel.org/cgit/linux/kernel/git/tip/tip.git/commit/?id=cae15db74999edb96dd9f5bbd4d55849391dd92b
# Example, with [FlameGraph](https://github.com/brendangregg/FlameGraph):
#     perf record -g target/debug/bin
#     perf script | stackcollapse-perf | rust-unmangle | flamegraph > perf.svg  

# Remove hash and address offset
s/::h[0-9a-f]{16}//g
s/\+0x[0-9a-f]+//g

garybernhardt

This document has moved!

It's now here, in The Programmer's Compendium. The content is the same as before, but being part of the compendium means that it's actively maintained.

farrokhi

#!/bin/sh

#
# Copyright (c) 2016 Babak Farrokhi.  All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# 1. Redistributions of source code must retain the above copyright

SpaceManiac

#![allow(non_camel_case_types)]
use std::mem;

// The Situation
struct ffi_Object;
type ffi_Callback = unsafe extern fn(*mut ffi_Object) -> u32;
extern fn ffi_push_callback(_: *mut ffi_Object, _: ffi_Callback) {}

// Dummy wrapper
struct Object {