ytakano

#include <stdio.h>

int main()
{
    volatile int i = 0;
    while (i < 100000000) {
        asm ("xbegin ABORT");
        i++;
        asm ("xend");
        asm ("ABORT:");

ytakano

#include <iostream>

int
main(int argc, char *argv[])
{
    unsigned char c;

    for (c = 0; c < 255; c++) {
        if (('a' <= c && c <= 'z') ||
            ('A' <= c && c <= 'Z') ||

ytakano

HTTP

$ curl -XPUT 'http://localhost:9200/sftap/_mapping/http?ignore_conflicts=true' -d '{
  "http" : {
    "properties" : {
      "client" : {
        "properties" : {
          "header" : {

"properties" : {

ytakano

ElasticsearchとKibanaを使ってみる

Oracle JDKのインストール

$ sudo add-apt-repository ppa:webupd8team/java
$ sudo apt-get update
$ sudo apt-get install oracle-java8-installer

Elasticsearchの実行

ytakano

netmap

カーネルコンフィグ

# cd /usr/src/sys/amd64/conf
# cp GENERIC GENERIC.netmap
# vi GENERIC.netmap

device netmap # add device of netma

ytakano

export TERM=xterm
#export PROMPT="%n@%m %#> "
export RPROMPT='[%~]'
export PATH=/homebrew/bin:/homebrew/sbin:/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin:/usr/X11R6/bin:/usr/local/texlive/2015/bin/x86_64-darwin
export LD_LIBRARY_PATH=/homebrew/lib:/lib:/usr/lib:/usr/local/lib:/usr/X11R6/lib
export LIBRARY_PATH=$LD_LIBRARY_PATH
export C_INCLUDE_PATH=/homebrew/include:/usr/include:/usr/local/include:/usr/X11R6/include
export CPLUS_INCLUDE_PATH=$C_INCLUDE_PATH
export MANPATH=$MANPATH:/homebrew/share/man:/usr/share/man:/usr/local/man
export HISTFILE=$HOME/.zsh_history

ytakano

遅い奴らまとめ

JavaのJNI，JNA

凄い遅い．ネイティブ関数を使うとWrite Once Run Anywareじゃなくなるので，わざと遅くしているに違いない．

Boostのshared_mutex

read-write lock使えて便利！と思いきや，めちゃくちゃ重い． 普通にboost::mutex使ったほうがはるかにマシ．

ytakano

GPUサーバの設定

GPUの確認

$ sudo nvidia-xconfig --query-gpu-info
Number of GPUs: 1

GPU #0:
Name      : GeForce GTX 750

UUID : GPU-6fa2bd4c-1dd7-8189-70eb-543817efcaff

ytakano

#include <pcap.h>

#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <math.h>

#include <net/ethernet.h>
#include <netinet/ip.h>

ytakano

Download Source Code of SF-TAP

$ pwd
$ ~/program/sf-tap
$ git clone https://github.com/SF-TAP/flow-abstractor.git
$ git clone https://github.com/SF-TAP/protocol-parser.git

Download Ad Chekcer

$ pwd