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# micro services - perf
## Overivew
glu mobile - microservices
- Use docker
- HTTP processing
- Amazon ECS
- NOSQL Redis + couch base
- 40M votes a day
- 1M active users
- 14K req/m
## Microservices
- Small
- Simole
- easy to deploy
- upgradable
Use Base images
Name by version and never change (Freeze them)
## background processing
- Execute externally
- Shutdown functions
- Job server
- fastcgi_finish_request
## HTTP Compression
- gzip on
- gzip_types
- gzip_proxied any
- gzip_comp_level 5
- gzip_min_length (default 20)
- Smaller than 1500B means it will always fit in one TCP packet
If content_length is not set then nginx will compress always
Laravel/Lume/Others add middleware to add content_length
## Caching
- HTTP2 Server push
- Repeated server calls HTTP1
- 304s
- Last-modified
- cache-control
## No SQL
- Mongo/Redis
- Fight network I/O
- save hdd space
- compress large messages
- serialise better
- message templates
- add ttl expiry
- shorten cache keys
## Fast caching
- PHP Redis
- Predis - high memory, slower
- Persistent connections available
## Deployment EC8
- 0 Downtime
- quick rollout
- ELB health-check
- Auto scaling
## Hardware upgrades
- Doubling the hardware, halving the # of machines
## VPC
- Closer together
- Same location
- utilise internal networks
- other thoughts
- Async I/O
- swoole
- HTTP/2
- Tars
- binary (80% reduction)
## Managing images
- Don't use aptitude (apt)
- Build from source
- fpm and Nginx together
- Separate not helpful
- No need for TCP/IP overhead
- supervisorD - everywhere
# Useful terms
aerospike
couch base
php_swoole
supervisorD
new relic
bugsnag
amazon cloud watch
sonarqube
sensolabs security checker
fastcgi_finish_request
crowdstar https://github.com/Crowdstar/background-processing
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