sshankar

Getting a network trace from a single application

Create a test network namespace

ip netns add test

Create a pair of virtual network interfaces (veth-a and veth-b)

ip link add veth-a type veth peer name veth-b

sshankar

  jlong cooked_allocated_bytes() {
    jlong allocated_bytes = OrderAccess::load_acquire(&_allocated_bytes);
    if (UseTLAB) {
      size_t used_bytes = tlab().used_bytes();
      if ((ssize_t)used_bytes > 0) {
        // More-or-less valid tlab.  The load_acquire above should ensure
        // that the result of the add is <= the instantaneous value
        return allocated_bytes + used_bytes;
 }

sshankar

From fb69a88323eef661b6a9113ad7967138f4d78e9f Mon Sep 17 00:00:00 2001
From: Shiv Shankar <shiv.shankar@gtnexus.com>
Date: Thu, 28 Apr 2016 15:53:33 -0400
Subject: [PATCH] from before it was mainstream

---
 GIT-VERSION-GEN | 22 ++--------------------
 1 file changed, 2 insertions(+), 20 deletions(-)

diff --git a/GIT-VERSION-GEN b/GIT-VERSION-GEN

sshankar

# Functions

lf() {
  local out=$1
  local location=$2
  local filetype=$3
  local rval=($(find $location -name $filetype -type f))
  eval "${out}=($rval)"
}

sshankar

Gaming Rig Setup on AWS

Network
 - Router
  - Setup DDNS
  - Setup L2TP over IPSec Server
   - Firewall: Accept connections only from AWS VPC
 - Server
  - Setup L2TP client

sshankar

import os, sys
import ogr
from math import ceil


def main(outputGridfn,xmin,xmax,ymin,ymax,gridHeight,gridWidth):

    # convert sys.argv to float
    xmin = float(xmin)
    xmax = float(xmax)

sshankar

class InlineTest {
    public static int increment(int i){
        return i + 1;
    }

    public static void main(String... args){
        int count = 1000_000_000;
        int state = 0;
        for (int i = 0; i < count; i++){

sshankar

wget http://www.java.net/download/openjdk/jdk8/promoted/b132/openjdk-8-src-b132-03_mar_2014.zip 
unzip openjdk-8-src-b132-03_mar_2014.zip 
cd openjdk/hotspot/src/share/tools/hsdis
wget http://ftp.gnu.org/gnu/binutils/binutils-2.24.tar.gz
tar -xzf binutils-2.24.tar.gz 
make ARCH=amd64 BINUTILS=binutils-2.24
sudo cp build/macosx-amd64/hsdis-amd64.dylib  $(/usr/libexec/java_home)/jre/lib/server/

sshankar

import java.util.concurrent.atomic.*;
import java.util.*;

public class MovingAvgIntervalEstimator {
    
    final long intervalEndTimes[];

    // window properties 
    final int windowMagnitude;

sshankar

$ cat <<EOF > __main__.py
heredoc> if __name__ == '__main__':
heredoc>     print 'hello, world!'
heredoc> EOF

$ zip hello.zip __main__.py 
  adding: __main__.py (stored 0%)

$ cat <(echo '#!/usr/bin/env python') hello.zip > hello
$ chmod +x hello