flandr

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs

flandr

From e8fb47a394e5c2e0ba6110ff96d216ba2c16bf61 Mon Sep 17 00:00:00 2001
From: Nate Rosenblum <[email protected]>
Date: Mon, 13 May 2013 16:33:19 -0700
Subject: [PATCH] Hide camellia symbols that collide with openssl

---
 src/lib/crypto/builtin/camellia/camellia.c | 32 +++++++++++++++---------------
 src/lib/crypto/builtin/camellia/camellia.h | 15 --------------
 2 files changed, 16 insertions(+), 31 deletions(-)

flandr

// Define a static local variable once, safely, for MSVC
//
// This macro is necessary because MSVC pre-2013 doesn't
// properly implement C++11 static local initialization.
// It is equivalent to writing something like
//
//     static type var = stmt;
//
// in a compliant compiler (e.g. GCC since who knows when)

flandr

// Copyright © 2014 Nate rosenblum <[email protected]>
// This work is free. You can redistribute it and/or modify it under the
// terms of the Do What The Fuck You Want To Public License, Version 2,
// as published by Sam Hocevar. See http://www.wtfpl.net/ for more details.

#include <inttypes.h>
#include <stdio.h>

#include <boost/date_time/posix_time/posix_time.hpp>
#include <boost/function.hpp>

flandr

# Plot histograms from variable frame input
getplots <- function(...) {
    frames <- list(...)
    names <- as.list(substitute(list(...)))[-1]

    # Find the max range
    m <- max(sapply(frames, function(f) { max(f$len) }))

    plots <- mapply(function(f,n) {
            print(max(f$len))

flandr

# Python 2.6's urllib2 does not allow you to select the TLS dialect,
# and by default uses a SSLv23 compatibility negotiation implementation. 
# Besides being vulnerable to POODLE, the OSX implementation doesn't
# work correctly, failing to connect to servers that respond only to
# TLS1.0+. These classes help set up TLS support for urllib2.

class TLS1Connection(httplib.HTTPSConnection):
    """Like HTTPSConnection but more specific"""
    def __init__(self, host, **kwargs):
        httplib.HTTPSConnection.__init__(self, host, **kwargs)

flandr

Keybase proof

I hereby claim:

• I am flandr on github.
• I am nater (https://keybase.io/nater) on keybase.
• I have a public key whose fingerprint is DB2F 5C5D 6B97 6DDE 1C42 07D3 8790 0700 F0FB E18A

To claim this, I am signing this object:

flandr

#include <stdio.h>

#include <functional>
#include <utility>

struct Big {
    char data[1024];
};

int main(int argc, char **argv) {

flandr

template<class _Rp, class ..._ArgTypes>
template <class _Alloc>
function<_Rp(_ArgTypes...)>::function(allocator_arg_t, const _Alloc&,
                                     function&& __f)
{
    if (__f.__f_ == 0)
        __f_ = 0;
    else if (__f.__f_ == (__base*)&__f.__buf_)
    {
        __f_ = (__base*)&__buf_;

flandr

#include "exp.h"

void no_args() {
    printf("no args\n");
}

void just_pathparams(PathParam<std::string> p1) {
    printf("just path params: %s\n", p1.value().c_str());
}