海运的博客

// 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，qq 465端口使用的smtps协议，而php-smtp使用starttls协议发送邮件，改使用qq smtp 587端口正常。

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

安装编译工具及依赖：

yum -y groupinstall "Development Tools"
yum -y install qt-devel boost-devel openssl-devel qt5-qtbase-devel qt5-linguist

安装libtorrent，libtorrent1.1.x版本会出现invalid port问题，参考https://tieba.baidu.com/p/5864985886

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
#修改为固定端口号
#sed -i "s/i2p ? 1 : tracker_req().listen_port/8999/" src/http_tracker_connection.cpp
./configure --prefix=/usr/local/libtorrent CXXFLAGS=-std=c++11
make && make install
echo '/usr/local/libtorrent/lib' > /etc/ld.so.conf.d/libtorrent-x86_64.conf 
ldconfig
#export LD_LIBRARY_PATH=/usr/local/libtorrent/lib/
export CPLUS_INCLUDE_PATH=/usr/local/libtorrent/include/
export PKG_CONFIG_PATH=/usr/local/libtorrent/lib/pkgconfig/

安装qbittorrent：

wget https://github.com/qbittorrent/qBittorrent/archive/release-4.1.2.tar.gz
tar zxf release-4.1.2.tar.gz
cd qBittorrent-release-4.1.2/
./configure --prefix=/usr/local/qbittorrent --disable-gui
make && make install
export PATH=$PATH:/usr/local/qbittorrent/bin/ 
echo 'export PATH=$PATH:/usr/local/qbittorrent/bin/' >> ~/.bashrc 

配置文件：

cat > ~/.config/qBittorrent/qBittorrent.conf <<- EOM

[BitTorrent]
Session\MultiConnectionsPerIp=true
Session\SendBufferLowWatermark=2000
Session\SendBufferWatermark=30000
Session\SendBufferWatermarkFactor=150

[LegalNotice]
Accepted=true

[Preferences]
Bittorrent\AddTrackers=false
Bittorrent\DHT=false
Bittorrent\Encryption=2
Bittorrent\MaxConnecs=2000
Bittorrent\MaxConnecsPerTorrent=200
Bittorrent\MaxRatioAction=0
Bittorrent\MaxUploads=1000
Bittorrent\MaxUploadsPerTorrent=100
Bittorrent\PeX=true
Bittorrent\uTP=true
Bittorrent\uTP_rate_limited=true
Connection\GlobalDLLimit=-1
Connection\GlobalDLLimitAlt=-1
Connection\GlobalUPLimit=-1
Connection\GlobalUPLimitAlt=-1
Connection\MaxHalfOpenConnec=200
Connection\PortRangeMin=58999
Connection\ResolvePeerCountries=false
Connection\ResolvePeerHostNames=false
Connection\UPnP=false
Downloads\PreAllocation=false
Downloads\SavePath=/home/download/
Downloads\ScanDirsV2=@Variant(\0\0\0\x1c\0\0\0\0)
DynDNS\DomainName=changeme.dyndns.org
DynDNS\Enabled=false
DynDNS\Password=
DynDNS\Service=0
DynDNS\Username=
General\Locale=zh
General\UseRandomPort=false
MailNotification\email=
MailNotification\enabled=false
MailNotification\password=
MailNotification\req_auth=true
MailNotification\req_ssl=false
MailNotification\smtp_server=smtp.changeme.com
MailNotification\username=
Queueing\MaxActiveDownloads=500
Queueing\MaxActiveTorrents=500
Queueing\MaxActiveUploads=500
Queueing\QueueingEnabled=false
WebUI\Address=0.0.0.0
WebUI\AuthSubnetWhitelist=@Invalid()
WebUI\AuthSubnetWhitelistEnabled=false
WebUI\CSRFProtection=true
WebUI\ClickjackingProtection=true
WebUI\HTTPS\Enabled=false
WebUI\LocalHostAuth=true
WebUI\Port=59999
WebUI\ServerDomains=
WebUI\UseUPnP=false
EOM

参考：https://github.com/qbittorrent/qBittorrent/wiki/Compiling-qbittorrent-nox-for-CentOS-from-source