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README.markdown

php-OnlineJudge

Sending Emails

See https://github.com/stfairy/mail.

Apache Configuration

$ sudo a2enmod rewrite
$ sudo a2enmod headers
$ sudo a2enmod expires
$ sudo apt-get install libapache2-mod-rpaf

/etc/apache2/sites-available/default:

<VirtualHost *:*>
  ####
    <IfModule mod_rpaf.c>
      RPAFenable On
      RPAFsethostname On
      RPAFproxy_ips 172.16.15.254 172.16.6.105 127.0.0.1
    </IfModule>
  ####
</VirtualHost>

/etc/apache2/apache2.conf:

KeepAliveTimeout 2
ServerLimit 5000
<IfModule mpm_prefork_module>
    StartServers           5
    MinSpareServers        5
    MaxSpareServers       10
    MaxClients           500
    MaxRequestsPerChild    0
</IfModule>

Nginx Configuration (for static assets)

server {
  listen 80;
  server_name js.giti.me;
  root /var/www/js.giti.me/;

  location ~* \.(?:ico|css|js|jpg|jpeg|gif|png|swf|htm|html)$ {
    expires max;
    add_header Pragma public;
    add_header Cache-Control "public, must-revalidate, proxy-revalidate";
    access_log off;
    log_not_found off;
  }
  location = /robots.txt  { access_log off; log_not_found off; }
  location = /favicon.ico { access_log off; log_not_found off; }
  location ~ /\.          { access_log off; log_not_found off; deny all; }
}

PHP Configuration

$ sudo apt-get install libapache2-mod-php5 php5-mysql php5-pgsql php5-curl php5-gd php5-mcrypt

php.ini: (Turn off zlib compression to make it faster! We have Varnish now!)

zlib.output_compression = Off
zlib.output_compression_level = -1
[Session]
session.save_handler = memcache
session.save_path = "tcp://172.16.6.107:11211"

Varnish Configuration

NOTE: I don't have enough time to document this. Just remember to install and start it:

$ sudo apt-get install varnish
$ sudo vim /etc/varnish/default.vcl
$ sudo pkill varnishd
$ sudo varnishd -f /etc/varnish/default.vcl -s malloc,1G -T 127.0.0.1:2000

Or to automatically start it, edit /etc/default/varnish:

DAEMON_OPTS="-a :80 \
             -T localhost:2000 \
             -f /etc/varnish/default.vcl \
             -S /etc/varnish/secret \
             -s malloc,2G"

/etc/varnish/default.vcl: (see details here: https://www.varnish-cache.org/trac/wiki/LoadBalancing)

backend default {
    .host = "127.0.0.1";
    .port = "8088";
    .probe = {
        .url = "/OnlineJudge/";
        .interval = 5s;
        .timeout = 3s;
        .window = 5;
        .threshold = 3;
    }
}
backend backup {
    .host = "172.16.6.106";
    .port = "8088";
    .probe = {
        .url = "/OnlineJudge/";
        .interval = 5s;
        .timeout = 3s;
        .window = 5;
        .threshold = 3;
    }
}
director oj_director round-robin {
    {
        .backend = default;
    }
    {
        .backend = backup;
    }
}
sub vcl_recv {
    if (req.url ~ "^/OnlineJudge/") {
        set req.backend = oj_director;
    }
    else {
        set req.backend = default;
    }
}
sub vcl_hash {
    # enable per-user caches
    if (req.http.Cookie) {
        hash_data(req.http.Cookie);
    }
}

MySQL Configuration

Remember to increase max_connections, thread_stack and max_heap_table_size in my.cnf:

max_connections = 1000
thread_stack = 640K
max_heap_table_size = 1024M

Also change default character set to UTF-8:

default-character-set = utf8

PostgreSQL Configuration

OJ has already been migrated from MySQL to PostgreSQL.

sudo apt-get install ruby rubygems libmysqlclient-dev libpq-dev
sudo gem install mysql pg mysql2psql

mysql2psql          # creates a .yml templae
vim mysql2psql.yml  # edit the template
mysql2psql          # connects to mysql database and write into postgres database

postgresql.conf:

ssl = false
shared_buffers = 1024M
effective_cache_size = 2048M

/etc/sysctl.d/30-postgresql-shm.conf:

# Maximum size of shared memory segment in bytes
kernel.shmmax = 2047483648
# Maximum total size of shared memory in pages (normally 4096 bytes)
kernel.shmall = 2097152

APC Configuration

On Ubuntu:

$ sudo apt-get install php-apc

On Mac OS X with XAMPP:

$ wget http://pecl.php.net/get/APC-3.1.11.tgz
$ tar -xf APC-3.1.11.tgz
$ cd APC-3.1.11
$ sudo /Applications/XAMPP/xamppfiles/bin/phpize
$ sudo MACOSX_DEPLOYMENT_TARGET=10.7 CFLAGS="-arch i386 -arch x86_64 -g -Os -pipe -no-cpp-precomp" CCFLAGS="-arch i386 -arch x86_64 -g -Os -pipe" CXXFLAGS="-arch i386 -arch x86_64 -g -Os -pipe" LDFLAGS="-arch i386 -arch x86_64 -bind_at_load" ./configure --with-apxs=/Applications/XAMPP/xamppfiles/bin/apxs --with-php-config=/Applications/XAMPP/xamppfiles/bin/php-config
$ sudo make
$ sudo make install

After running phpize, check whether there are any errors like:

grep: /Applications/XAMPP/xamppfiles/include/php/php-5.3.1/php/main/php.h: No such file or directory
grep: /Applications/XAMPP/xamppfiles/include/php/php-5.3.1/php/Zend/zend_modules.h: No such file or directory
grep: /Applications/XAMPP/xamppfiles/include/php/php-5.3.1/php/Zend/zend_extensions.h: No such file or directory

In case there are errors like this, copy corresponding files from /Developer/SDKs/MacOSX10.7.sdk/usr/include/php/.

APC configuration in php.ini:

apc.stat=1
apc.shm_size=256M
apc.max_file_size=10M
apc.num_files_hint=10000
apc.user_entries_hint=10000

Memcached Configuration

APC seems not working with XAMPP on Mac OS X (see here). So for application-purpose caching (instead of opcode caching), we use memcached.

On Ubuntu:

$ sudo apt-get install memcached
$ sudo apt-get install php5-memcache

On Mac OS X with XAMPP:

$ pecl download memcache
$ tar -xf memcache-2.2.6.tgz
$ cd memcache-2.2.6
$ sudo /Applications/XAMPP/xamppfiles/bin/phpize
$ sudo MACOSX_DEPLOYMENT_TARGET=10.7 CFLAGS="-arch i386 -arch x86_64 -g -Os -pipe -no-cpp-precomp" CCFLAGS="-arch i386 -arch x86_64 -g -Os -pipe" CXXFLAGS="-arch i386 -arch x86_64 -g -Os -pipe" LDFLAGS="-arch i386 -arch x86_64 -bind_at_load" ./configure --with-apxs=/Applications/XAMPP/xamppfiles/bin/apxs --with-php-config=/Applications/XAMPP/xamppfiles/bin/php-config
$ sudo make
$ sudo make install

Finally enable it in php.ini: (e.g. /Applications/XAMPP/xamppfiles/etc/php.ini)

extension=memcache.so

Fortunately memcached got already installed by the Mac OS X Developer Tools (Xcode). Just go ahead and start the memcached daemon:

$ memcached -m 8 -l 127.0.0.1 -p 11211 -d

-m 8 limits memcached to use a maximum of 8MB RAM to operate
-l 127.0.0.1 -p 11211 is the ip and port to listen on
-d tells it to start as a daemon
(instead of -l and -p you can also use -s to use an unix domain socket)

In production, should edit /etc/memcached.conf: (-l for PHP load balancing)

-m 1024
-l 172.16.6.107

APD Configuration

Advanced PHP debugger (APD) is used to profile PHP scripts. Installation is very much similar to the previous two modules on Mac OS X with XAMPP:

$ pecl download apd
$ tar -xf apd-1.0.1.tgz
$ cd apd-1.0.1
$ sudo /Applications/XAMPP/xamppfiles/bin/phpize
$ sudo MACOSX_DEPLOYMENT_TARGET=10.7 CFLAGS="-arch i386 -arch x86_64 -g -Os -pipe -no-cpp-precomp" CCFLAGS="-arch i386 -arch x86_64 -g -Os -pipe" CXXFLAGS="-arch i386 -arch x86_64 -g -Os -pipe" LDFLAGS="-arch i386 -arch x86_64 -bind_at_load" ./configure --with-apxs=/Applications/XAMPP/xamppfiles/bin/apxs --with-php-config=/Applications/XAMPP/xamppfiles/bin/php-config

Just before compiling the source codes, modify php_apd.c line 967 and change CG(extended_info) = 1; to CG(compiler_options) |= ZEND_COMPILE_EXTENDED_INFO;. Otherwise the compilation will fail (with APD version 1.0.1).

$ sudo make
$ sudo make install

Then modify php.ini to load the extension:

zend_extension = /Applications/XAMPP/xamppfiles/lib/php/php-5.3.1/extensions/no-debug-non-zts-20090626/apd.so
apd.dumpdir = /tmp
apd.statement_tracing = 0

APD usage is described here. Note that two scripts shipped with APD (1.0.1) is also available in the sub-directory scripts, i.e. pprofp and pprof2calltree. The first line of pprofp is modified slightly to suit Mac OS X environments. Also the line require "Console/Getopt.php" may fail due to incorrect PEAR path configuration. Run the following command to get the PEAR directory:

$ pear config-show | grep "PEAR directory"

And then update /etc/php.ini (this INI file may be different from the one used by your Web scripts) with a correct include_path:

include_path = .:/path/to/your/pear/directory

Finally try ./scripts/pprofp to see whether the configuration works.

$ ./scripts/pprofp 
pprofp <flags> <trace file>
    Sort options
    -a          Sort by alphabetic names of subroutines.
    -l          Sort by number of calls to subroutines
    -m          Sort by memory used in a function call.
    -r          Sort by real time spent in subroutines.
    -R          Sort by real time spent in subroutines (inclusive of child calls).
    -s          Sort by system time spent in subroutines.
    -S          Sort by system time spent in subroutines (inclusive of child calls).
    -u          Sort by user time spent in subroutines.
    -U          Sort by user time spent in subroutines (inclusive of child calls).
    -v          Sort by average amount of time spent in subroutines.
    -z          Sort by user+system time spent in subroutines. (default)

    Display options
    -c          Display Real time elapsed alongside call tree.
    -i          Suppress reporting for php builtin functions
    -O <cnt>    Specifies maximum number of subroutines to display. (default 15)
    -t          Display compressed call tree.
    -T          Display uncompressed call tree.

Rejudger Configuration

$ sudo apt-get install build-essential tcl-dev git python-pycurl openjdk-6-jdk

$ cd
$ scp -r xjia@172.16.9.36:big_dog_guard/ .
$ cd big_dog_guard/
$ make
$ sudo mkdir -p /root/big_dog_guard/
$ sudo make install

$ cd
$ scp -r xjia@172.16.9.36:rejudger/ .
$ sudo mkdir -p /var/cache/rejudger
$ sudo mkdir -p /etc/rejudger/
$ sudo touch /etc/rejudger/java.policy

$ sudo touch /var/log/rejudger.log
$ sudo chmod +rw /var/log/rejudger.log

$ cd
$ git clone git://github.com/visionmedia/mon.git
$ cd mon
$ make
$ sudo make install

$ sudo vim /etc/rc.local
#!/bin/sh -e
# ...
/usr/local/bin/mon -d "/home/xjia/rejudger/rdaemon" -p "/tmp/rejudger.pid"
exit 0

$ sudo -i
# cat > /etc/ld.so.conf.d/java.conf
/usr/lib/jvm/java-6-openjdk-amd64/jre/lib/amd64/jli
# ldconfig
# ssh-keygen
(* add root@ACMGrader-n public key to xjia@giti.me *)
# mkdir -p /data
# cd /data
# git clone git@giti.me:ojcreator/oj.git
# reboot

NOTE: May need to increase memory limit in java.py in case of CE or RE. If the judger has 2G RAM, just set the memory limit to 2G (i.e. 2048 * 1024 * 1024).

License

Copyright 2012 Xiao Jia

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.