Yaolong Huang airekans

AWS
California
airekans.github.io

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airekans / test_setitimer.cpp

Last active August 29, 2015 14:10

A simple program used to test whether the kernel support setitimer to be enabled for multiple threads by default. This can be used to detect whether gperftools can be used easily

	#include <pthread.h>
	#include <iostream>
	#include <string>
	#include <cstdlib>
	#include <sys/time.h>

	using namespace std;

	static int mode = ITIMER_PROF;

airekans / heap_merge.cpp

Created November 3, 2014 08:02

Use heap to merge multiple arrays into a single array

	void Merge3(const vector<int>& v1, const vector<int>& v2, const vector<int>& v3, vector<int>& v4)
	{
	typedef pair<size_t, const vector<int>*> HeapElem;
	vector<HeapElem> int_heap;

	if (!v1.empty())
	{
	int_heap.push_back(make_pair(0, &v1));
	}
	if (!v2.empty())

airekans / fake_syscall.c

Created October 23, 2014 09:00

Use LD_PRELOAD to test program using syscall

	#define _GNU_SOURCE 1

	#include <dlfcn.h>
	#include <string.h>
	#include <stdlib.h>

	int open(const char *pathname, int flags)
	{
	typedef int (OpenFunc)(const char, int);
	static OpenFunc real_open_func = NULL;

airekans / test_killall.py

Created October 13, 2014 14:40

Program used to test killall in gevent

	import gevent


	threads = []

	def killall_but_this():
	this_thread = gevent.getcurrent()
	for t in threads:
	if t is not this_thread:
	t.kill(block=False)

airekans / client.cpp

Created October 11, 2014 07:59

Programs used to check send buffer size in TCP

	#include <iostream>
	#include <sys/types.h>
	#include <sys/socket.h>
	#include <netinet/ip.h>
	#include <arpa/inet.h>
	#include <cstdlib>
	#include <fcntl.h>
	#include <errno.h>
	#include <cstring>

airekans / p4unsh.py

Last active August 29, 2015 14:06

Script used to sync files from p4 shelve

	#! /usr/bin/env python2.7

	import pypipe # use pypipe from https://github.com/airekans/Pypipe
	import sys
	import os

	_BACKUP_CL = 123456


	def is_p4_different(p4_path, shelve_cl):

airekans / bandwidth.py

Last active August 29, 2015 14:06

A simple python script used to get the bandwidth between 2 hosts.

	#! /usr/bin/env python
	#
	# This script shows the correct result only when the host(client or server)
	# is idle(no other network intensive program is running).
	# So if you run two client on the same host, the result is wrong.

	import socket
	import sys
	import time

airekans / file_owner_cnt.py

Created August 23, 2014 09:08

A MapReduce example: Given a list of (user_name, filename) pair, get a list of (filename, owner_count)

	l = [("user_a", "file_a"), ("user_b", "file_b"), ("user_c", "file_b")]

	filenames = map(lambda p: p[1], l)

	def reduce_func(res, filename):
	if filename not in res:
	res[filename] = 0

	res[filename] += 1
	return res

airekans / replace_so.sh

Created July 25, 2014 03:20

A simple shell script used to update so file.

	#! /bin/bash

	if [ $# -lt 2 ]; then
	echo Usage: $0 MD5 SO_FILE_NAME
	exit 1
	fi

	file_md5=$1
	so_filename=$2
	tmp_so=${so_filename}.$RANDOM

airekans / test_time.cpp

Created May 25, 2014 08:31

A simple program used to test the performance of gettimeofday.

	#include <cstdlib>
	#include <sys/time.h>
	#include <cerrno>
	#include <cstring>
	#include <iostream>


	using namespace std;

	static void my_get_time(timeval* tv)

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