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Latency numbers (cheat sheet)

Operation	nanosec	microsec	millisec	notable	1Bx
L1 cache reference	0.5 ns				0.5 s
Branch mispredict	5 ns				5 s
L2 cache reference	7 ns			14x L1 cache	7 s
Mutex lock/unlock	25 ns				25 s
Main memory reference	100 ns			20x L2 cache, 200x L1 cache	1.6 m
Compress 1K bytes with Zippy	3,000 ns	3 µs			`5

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Background

Sometimes you need a specific version of Terraform a build for your combination of Operating System / Architecture doesn't exist. This can be because that combination came out later than the version of Terraform you are after, or some other reason.

But, no fear, Golang compiler is great, and the Terraform codebase is pretty easy.

Disclaimer

This describes a build process that produces a working binary,

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Introduction

If you, like me, want to contribute to Folding@Home from your Linux home server, it takes just few easy steps.

Setup

1. Create your Folding@Home Passkey here (needed in a sec)
2. Install the Folding@Home Client (instructions)
3. Configure it at /etc/fahclient/config.xml

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use http::Error as HttpError;

use std::{fmt, error};

type Result<T> = std::result::Result<T, ResolutionError>;

/// A type of `Error` emitted by `Resolver`
///
/// It contains a description and an optional `HttpError` that might have caused it
#[derive(Debug)]

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import org.apache.commons.compress.compressors.xz.XZCompressorOutputStream;

import javax.validation.constraints.NotNull;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;

/**
 * Wraps a generic InputStream into a XZ Compressed InputStream.
 *

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Keybase proof

I hereby claim:

• I am detro on github.
• I am ivandemarino (https://keybase.io/ivandemarino) on keybase.
• I have a public key ASAqluqfdxEe_p__agBOYpFKA_rnlPdZmi3YWIpyt90w8go

To claim this, I am signing this object:

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fn main() {

  // This might seem like a lot of lines for just catching the 2nd argument,
  // parse the string to int and store it in a variable, but what this also covers is
  // the absence of such value (first error case) or the non-parsability of the argument (second error case).
  //
  // I'm liking this stuff so far.
  let n = match env::args().skip(1).next() {
    Some(x) => match x.parse::<usize>() {
      Ok(y) => y,

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description "Starts a SimpleHTTPServer to host 1 Password Anywhere"
author "Ivan De Marino <[email protected]>"
version "1.0.0"

# When to start/stop
start on runlevel [2345]
stop on runlevel [016]

# Keep it running
respawn

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private LogEntries getRemoteEntries(String logType) {
    Object raw = executeMethod.execute(DriverCommand.GET_LOG, ImmutableMap.of(TYPE_KEY, logType));
    @SuppressWarnings("unchecked")
    List<Map<String, Object>> rawList = (List<Map<String, Object>>) raw;
    List<LogEntry> remoteEntries = Lists.newArrayListWithCapacity(rawList.size());

    for (Map<String, Object> obj : rawList) {
      remoteEntries.add(new LogEntry(LogLevelMapping.toLevel((String)obj.get(LEVEL)),
          (Long) obj.get(TIMESTAMP),
          (String) obj.get(MESSAGE)));

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// Use Gists to store code you would like to remember later on
console.log(window); // log the "window" object to the console