This document discusses ISUCON and details several aspects of the system. It describes using Slim and Twig for the PHP framework and storing data in a database. It also discusses routing requests to the database to retrieve icon data and load balancing across multiple web and database servers. Caching is implemented to improve performance using Last-Modified headers.

1. ISUCON
2017.10.27

2. ISUCON
ISUCON
▸
▸
▸
▸
▸
▸ 407 1132

3. ISUCON
CHAT
▸ 3
▸ WEB 2 DB1
▸ …
▸

4. ISUCON
CHAT
▸
▸
▸
▸ DM
▸
▸
▸ ( )
▸

5. ISUCON
( )
1
2
3
4
A
B
C
LOGO yume
1
237
498
78

6. ISUCON
PHP
▸ Slim
▸ Twig
▸ ↑
▸
▸ index.php

7. ISUCON
DB

8. ISUCON
▸
▸
▸ ID
▸ ( ) - ( ID
)

9. ISUCON
▸ DB
▸ /icons/{ }
▸ DB
▸ WHERE ID
▸ URI

10. ISUCON
▸
▸
▸
▸
▸
▸ DB

11. ISUCON
▸ wget
▸ nginx /icons/ PHP
▸ DB

12. ISUCON
▸
▸ DB → /icons/
▸
▸ WEB
▸ WEB 1 +DB1
▸ 1

13. ISUCON
▸
▸ 919( )
▸
▸
▸ …
1
2
3
4 919
919
919
919

14. ISUCON
PHP
▸
▸ ORDER BY DB PHP
▸

16. 304

17. ISUCON
▸ WEB
▸
▸ 304
▸ Last-Modified
▸

18. ISUCON
▸
▸
▸
▸ N+1 COUNT
…
▸ …

19. ISUCON
8
▸
▸ 21
▸
▸
▸

20. ISUCON
▸
▸
▸
▸