kai5263499

• System Performance Book
• Student labs for Cloud Performance training
• Performance analysis labs
• Linux Performance Analysis in 60,000 Milliseconds
  • Linux Performance Analysis in 60 Seconds
• Performance Checklists For SREs
• Linux Performance Tools Part 1
  • Part 2
• USE Method
• Rosetta Stone of Performance Checklists

kai5263499

• High-performance Linux monitoring with eBPF
• Netdev 1.2 - eBPF Offload to Hardware: cls_bpf and XDP - Nick Viljoen, Jakub Kicinski
• Alex Gartrell Executing python functions in the linux kernel by transpiling to bpf PyCon 2017
• Transparent eBPF Offload: Playing Nice with the Linux Kernel
• Golang bcc/BPF Function Tracing
• Go bindings for creating BPF programs
• eBPF program using kprobes to trace TCP events without run-time compilation dependencies
• BPF: Tracing and More
• Give me 15 minutes and I'll change your view of Linux tracing
• [Infrastructure 2017 - Alfo

kai5263499

apt-get -y install ngrep tcpflow httpry scapy tshark

httpry

ngrep -l -q -d eth0 "^GET|^POST " tcp and port 80

tcpflow -p -c -i eth0 port 80 | grep -oE '(GET|POST|HEAD) .* HTTP/1.[01]|Host: .*'

tcpdump -s 0 -A 'tcp dst port 80 and (tcp[((tcp[12:1] & 0xf0) >> 2):4] = 0x504f5354)'

kai5263499

# Find packages that depend on PACKAGE
apt-cache rdepends PACKAGE

# Find packages that PACKAGE depends on
apt-cache depends PACKAGE

# Find packages that provide FILE
dpkg -S FILE
apt-file find FILE

kai5263499

# inspired by https://stackoverflow.com/questions/10644925/randomly-interleave-2-arrays-in-python

def mix_with_ratio(a, b, ratio):
    c = []
    while a and b:
        which_list = random.random()
        if which_list < ratio:
            c.append(a.pop(0))
        else:
            c.append(b.pop(0))

kai5263499

# from https://stackoverflow.com/questions/312443/how-do-you-split-a-list-into-evenly-sized-chunks
def chunks(l, n):
    """Yield successive n-sized chunks from l."""
    for i in xrange(0, len(l), n):
        yield l[i:i + n]

kai5263499

class TimeoutError(Exception):
    pass

class timeout:
    def __init__(self, seconds=1, error_message='Timeout'):
        self.seconds = seconds
        self.error_message = error_message
    def handle_timeout(self, signum, frame):
        raise TimeoutError(self.error_message)
    def __enter__(self):

kai5263499

def RateLimited(maxPerSecond):
    minInterval = 1.0 / float(maxPerSecond)
    def decorate(func):
        lastTimeCalled = [0.0]
        def rateLimitedFunction(*args,**kargs):
            elapsed = time.clock() - lastTimeCalled[0]
            leftToWait = minInterval - elapsed
            if leftToWait>0:
                time.sleep(leftToWait)
            ret = func(*args,**kargs)

kai5263499

package main

import (
	"fmt"
	"reflect"
)

type A interface {
	Set(string) error
}

kai5263499

#!/bin/bash
# myapp daemon
# chkconfig: 345 20 80
# description: myapp daemon
# processname: myapp

DAEMON_PATH="/home/wes"

DAEMON=myapp
DAEMONOPTS="-my opts"