Technical Specifications Grading Server and Technologies

Grading Servers

As of 2015, mrJudge uses AWS Lambda as grading servers.

The pay-per-use model of AWS Lambda enables mrJudge to cut costs when there are no submissions to be graded.

In addition, the scalability of serverless technologies enables mrJudge to grade all testcases in parallel. This reduces the amount of time users have to wait before their submission results are generated.

AWS Lambda [Link]

Operating System

Amazon Linux

Location

AWS Oregon Region

CPU

Intel Xeon E5-2670 @ 2.6GHz (or better)

RAM

1536MB

Compiler

GNU g++ 7.3.0

Concurrency

Up to 2000
(Historical) DigitalOcean VPS server [Referral Link]

Operating System

Ubuntu 12.04.4 LTS 64-bit

Location

Singapore

CPU

Intel(R) Xeon(R) CPU E5-2630L @ 2.00GHz

RAM

512MB

Storage

20GB SSD

Network

up to 1Gbps uplink/downlink

Compiler:

g++ (Ubuntu/Linaro 4.6.3-1ubuntu5) 4.6.3

Technologies

Server-Side Scripting: PHP 7, running as fpm
Web Server Technologies: Nginx, with CloudFlare CDN
Linux Dependencies: g++
lib_jpeg-dev
rsync
sshpass
python3
Client-Side Scripting: Javascript with jQuery v2.0.2
Database: Percona XtraDB Cluster 5.6 with 3-5 replicated nodes
Plugins: Ace IDE[Link]
AdminLTE theme [Link]
AWS SDK for PHP [Link]
Bootstrap 3 [Link]
Bootstrap-wysihtml5 text editor [Link]
Combodate [Link]
Data Tables [Link]
Docker[Link]
Dropzone file upload [Link]
Font Awesome icons [Link]
Full Calendar [Link]
Glyphicons [Link]
iCheck [Link]
Ionicons [Link]
jQuery Knob [Link]
Livestamp.js [Link]
Mandrill via SMTP [Link]
morris.js charts [Link]
Pnotify notifications [Link]
Select2 [Link]
SwiftMailer [Link]
Twitter typeahead.js [Link]
X-editable [Link]