jvns

jvns

const fetch = require('node-fetch');
async function run() {
    let username = "YOUR USERNAME HERE";
    let password = "YOUR APP PASSWORD";
    let authBasic = new Buffer(username + ':' + password).toString('base64');
    let session = await (await fetch('https://jmap.fastmail.com/.well-known/jmap', {
        headers: {
            "Authorization": "Basic " + authBasic
        }
    })).json();

jvns

// fairyfloss theme for blink shell

black       = '#5A5475';
red         = '#F92672'; // x red
green       = '#C2FFDF'; // x green
yellow      = '#E6C000'; // x yellow
blue        = '#C5A3FF'; // x blue
magenta     = '#C5A3FF'; // x pink
cyan        = '#C2FFDF'; // x cyan
white       = '#F8F8F0'; // x light gray

jvns

function examineNaN(x) {
    const buf = new ArrayBuffer(8);
    const view = new DataView(buf);

    view.setFloat64(0, x);

    let binStr = '';
    for (let i = 0; i < 8; i++) {
        binStr += ('00000000' + view.getUint8(i).toString(2)).slice(-8) + ' ';
    }

jvns

find 27968 97997.204322:     707897 cycles:pp: 
            7fffc034eac7 read_extent_buffer ([kernel.kallsyms])
            7fffc032e4f7 btrfs_real_readdir ([kernel.kallsyms])
            7fff81229eb8 iterate_dir ([kernel.kallsyms])
            7fff8122a359 sys_getdents ([kernel.kallsyms])
            7fff81850fc8 entry_SYSCALL_64_fastpath ([kernel.kallsyms])
                   c88eb __getdents64 (/lib/x86_64-linux-gnu/libc-2.23.so)

jvns

Talks I'd love to see at RustConf

hi! I'm on the RustConf program committee this year, so here is a quick list of talks I'd be interested in seeing submitted. These are just things I personally think are interesting and I certainly don't represent the program committee as a whole :). As of today I haven't seen talk proposals about any of these!

introduce a small part of the Rust compiler

I imagine a lot of Rust developers have never read any of the code in the Rust compiler (I haven't!). And I know the language is trying to bring in more contributors! So I think an awesome talk could be:

• pick a small part of the Rust compiler (maybe a part you've contributed to!)

jvns

% self  % total  name
 68.90    68.90  sleeping - ci/ruby-programs/day.rb
 10.33    10.33  black_panther - ci/ruby-programs/day.rb
  6.99     6.99  learn - ci/ruby-programs/day.rb
  6.89     6.89  eat - ci/ruby-programs/day.rb
  6.89     6.89  clean - ci/ruby-programs/day.rb
  0.00   100.00  block in <main> - ci/ruby-programs/day.rb
  0.00   100.00  <main> - ci/ruby-programs/day.rb
  0.00   100.00  <c function> - unknown

jvns

#!/usr/bin/python
# to try this you'll need to edit in the name of your ruby binary and install bcc-tools
# bcc installation instructions are at https://github.com/iovisor/bcc/blob/master/INSTALL.md

from __future__ import print_function
from bcc import BPF
from time import sleep
import os

# load BPF program

jvns

#include <mach/mach_init.h>
#include <mach/port.h>
#include <sys/wait.h>
#include <unistd.h>
#include <stdio.h>

int main() {
    for (;;) {
        pid_t pid = fork();
        if (pid == 0) execv("/usr/bin/true", NULL); 

jvns

Ruby and Python profilers

CPU profilers

Python

• cProfile
• https://github.com/bdarnell/plop (blog post)
• https://github.com/rkern/line_profiler
• https://github.com/uber/pyflame (blog post)