eddyxu

#!/bin/sh

TIMESTAMP=`date +"%F"`
SRC_PATH="/base/src/path"
TAR_PATH="/target/path"

if [ ! -d $TAR_PATH ]; then
        mkdir -p $TAR_PATH
fi

eddyxu

class Trace: 
    """A trace iterator
For each run of iteration, this object returns one trace entry
    """
    def __init__(self, filepath):
        self.filepath = filepath 
        self.fd = open(filepath)

    def __enter__(self):
        return self

eddyxu

pid_t getppid_for_process(pid_t pid) {
#if defined(__APPLE__)
	struct kinfo_proc info;
	size_t length = sizeof(struct kinfo_proc);
	int mib[4] = { CTL_KERN, KERN_PROC, KERN_PROC_PID, pid };
	if (sysctl(mib, 4, &info, &length, NULL, 0) < 0)
		return -1;
	if (length == 0)
		return -1;
	return info.kp_eproc.e_ppid;

eddyxu

#!/usr/bin/env python
#
# Lei Xu <eddyxu@gmail.com>

"""Manually set CPU cores online or offline
"""

import glob
import optparse
import os

eddyxu

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
Send 2K bytes over 1 Gbps network        20,000 ns
Read 1 MB sequentially from memory      250,000 ns
Round trip within same datacenter       500,000 ns
Disk seek                            10,000,000 ns

eddyxu

class benchmark(object):
    """Run a function as benchmark for several times.

    Usage:
     >>> @benchmark(times=1)  # times is a optional parameter.
     >>> def awesome_benchmark(arg1, arg2):
         >>> # do awesome benchmarks.
    """
    def __init__(self, **kwargs):
        self.times = kwargs.get('times', 1)

eddyxu

#!/bin/sh
#
# Git Precommit Script for Research project.
# Lei Xu <eddyxu@gmail.com>

# Enforce C++ Style Checking (Google C++ Style).
# Note: you must have cpplint.py installed in your $PATH
CPPFILES=`git diff --cached --name-only | grep -E '^.+\.(h|hpp|cpp|cc)$'`
if [ ! -z "$CPPFILES" ]; then
	echo "$CPPFILES" | xargs -n 128 cpplint.py

eddyxu

f1 = 1
f2 = 1

while True:
    f2, f1 = f1 + f2, f2

eddyxu

#!/usr/bin/env python
#
# Author: Lei Xu <eddyxu@gmail.com>

"""Eular Project Problem 119
http://projecteuler.net/problem=119
"""

import heapq

eddyxu

1. Copy /etc/passwd /etc/group /etc/gshadow /etc/shadow /etc/hosts from head to the newly installed node.
2. Sets /etc/network/interfaces with static IP address
3. apt-get install nfs-common
4. Sets /etc/fstab to mount home to the head node.
5. Reboot.