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查看文件压缩类型：

file initrd.img

如果是gzip：

mv initrd.img initrd.img.gz
gzip -d initrd.img.gz

如果是xz：

initrd.img initrd.img.xz
mv xz -d initrd.img.xz

解压出来是cpio archive文件，然后文件解压出来：

cpio -i -d < initrd.img

打包：

find . | cpio -H newc --create --verbose | gzip -9 > ../initrd.img

// 1600mb cache
pack.set_int(libt::settings_pack::cache_size, 102400);
pack.set_bool(libt::settings_pack::use_read_cache, true);
pack.set_int(libt::settings_pack::suggest_mode, libt::settings_pack::suggest_read_cache);
// of 500 ms, and a send rate of 24 MB/s, the upper
// limit should be 12 MB
pack.set_int(libt::settings_pack::send_buffer_watermark, 12 * 1024 * 1024);
// put 1.5 seconds worth of data in the send buffer
// this gives the disk I/O more heads-up on disk
// reads, and can maximize throughput
pack.set_int(libt::settings_pack::send_buffer_watermark_factor, 150);
// always stuff at least 1 MiB down each peer
// pipe, to quickly ramp up send rates
pack.set_int(libt::settings_pack::send_buffer_low_watermark, 1 * 1024 * 1024);

其它可开启suggest_mode，关闭uTP。
来源：https://github.com/arvidn/libtorrent/issues/1709
参考：https://www.libtorrent.org/tuning.html

使用https://github.com/snipworks/php-smtp 通过qq smtp 465端口发送邮件失败，原因是smtp ssl有两个端口使用不同的两种协议：
465端口使用smtps协议，php-smtp设置setProtocol(Email::SSL);
587端口使用starttls协议，php-smtp设置setProtocol(Email::TLS);

不重视数据安全可使用以下方法提升硬盘读写文件性能。

mount -o noatime,data=writeback,commit=60,barrier=0,noacl,nouser_xattr,delalloc
tune2fs -o journal_data_writeback /dev/sdb1

或直接关闭日志功能：

tune2fs -O ^has_journal /dev/sdb1
tune2fs -l /dev/sdb1 |grep 'Filesystem features'|grep 'has_journal'
mount -o noatime,noacl,nouser_xattr,delalloc

重新开启日志：

tune2fs -O has_journal /dev/sdb1  

http://blog.51cto.com/purplegrape/1421331
https://blog.csdn.net/helloanthea/article/details/50464774
http://blog.chinaunix.net/uid-1829236-id-3188132.html

安装环境及依赖：

yum -y groupinstall "Development Tools"
yum -y install boost-devel openssl-devel
yum -y install python-devel python-pip GeoIP-devel gettext intltool 
pip install setuptools twisted pyopenssl simplejson pyxdg chardet geoip setproctitle pillow mako service_identity

编译安装libtorrent：

wget https://github.com/arvidn/libtorrent/releases/download/libtorrent-1_1_9/libtorrent-rasterbar-1.1.9.tar.gz
tar -zxf libtorrent-rasterbar-1.1.9.tar.gz
cd libtorrent-rasterbar-1.1.9
./configure --prefix=/usr/local/libtorrent --enable-python-binding --with-libiconv
make && make install
echo '/usr/local/libtorrent/lib' > /etc/ld.so.conf.d/libtorrent-x86_64.conf 
ldconfig
export PYTHONPATH=$PYTHONPATH:/usr/local/libtorrent/lib64/python2.7/site-packages/
echo 'export PYTHONPATH=$PYTHONPATH:/usr/local/libtorrent/lib64/python2.7/site-packages/' >> ~/.bashrc

查看python能否加载libtorrent模块，成功返回版本号。

python -c "import libtorrent; print libtorrent.version"

安装deluge：

wget http://download.deluge-torrent.org/source/deluge-1.3.15.tar.gz
tar -xzvf deluge-1.3.15.tar.gz
cd deluge-1.3.15
mkdir -p /usr/local/deluge/lib/python2.7/site-packages/
export PYTHONPATH=$PYTHONPATH:/usr/local/deluge/lib/python2.7/site-packages/
echo 'export PYTHONPATH=$PYTHONPATH:/usr/local/deluge/lib/python2.7/site-packages/' >> ~/.bashrc
python setup.py build
python setup.py install --prefix /usr/local/deluge
export PATH=$PATH:/usr/local/deluge/bin/
echo 'export PATH=$PATH:/usr/local/deluge/bin/' >> ~/.bashrc

参考：
https://dev.deluge-torrent.org/wiki/Building/libtorrent
https://dev.deluge-torrent.org/wiki/Installing/Source