1. SIMAGINARITY Salih Safa BACANLI

2. Description Simaginarity is a site that allows users to upload their photos and see the other users’ photos that are similar to theirs’. Photo and username

3. Technologies PHP (Apache Server) MYSQL Amazon EC2 (servers) Amazon S3 (file storage)

4. PHP Easy to handle code & design Relatively fast Supported by Amazon AWS

5. MYSQL (mysqli) Works fine with Apache, PHP Necessary to get ordered data

6. db host MYSQL APACHE

7. Basic Scenario Users creates an account with email and username User uploads photos (rare) User sees similar photos (often)

8. Now... When user uploads a new photo it is compared with all of the photos in the system and similarity values written to database (heavy work) When user wants to see similar photos photo information from database is shown. No calculation again.

9. Before... Calculation is done when everytime user sees similar photos. Time consuming, Kills the efficiency when number of photos increase Previous design is changed

10. In order to see the most similar photos we need to get the ordered values of comparison. Not possible with nosql database Installed Redis (nosql database) but useless Redis is slow if working in VM (EC2) http://redis.io/topics/latency http://redis.io/topics/latency http://stackoverflow.com/questions/11765502/best-ec2-setup-for- redis-server http://stackoverflow.com/questions/11765502/best-ec2-setup-for- redis-server

11. Why not nosql

12. DB

13. MVC Model Config.php View Php html files Controller library.php

14. Image Functions Histogram Histcompare sum (x i -y i ) 2 (Covariance) If array sizes different than some value, histograms are not same (value:99) The more value is closer to 0 the more similar are the images Get the sorted values of «value» in imagecomp table Average (not used) Getting average color

15. What should be done to make it more efficient? SQS (no time left) Comparison is done by host now. If it can be done by another server or DB server, the host can be little light afterwards. Average value comparison (recorded, not used) A way to do the processing on S3. Files are processed on local. Some way to make the processing on user’s computer (javascript, java) Using maybe nosql for users and images table

16. Site feature improvements Make users define groups of photos so that only their friends see their similar photos To make the job realistic, get only some points of photo histogram Image processing techniques Geotagging Mobile version of site

17. What I learnt? Using AWS Nice features of Cloud Getting used to using Distributed System Useful cloud computing usage idea

18. Demo time http://ec2-54-200-159-114.us- west- 2.compute.amazonaws.com