AWS Load Balancer - Multiple vs single

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Hello AWS practitioners,

We have a single classic load balancer for 8 EC2 instances, which makes more than a million request ever hour.

My queries are:

  1. If we increase the number of load balancers from 1 to 2 or more, does that will improve the performance (significantly)?
  2. We only make HTTPs requests, switching from Classic to ALB will improve the performance ?
  3. What are the settings or attributes that we should be looking for optimising the performance and reduce the cost?
amazon-elastic-beanstalk performance-testing amazon-web-services load-balancing
1 Answers
  1. it should not significantly improve performance as a loadbalancer only distributes load over these 8 instances.
  2. This could improve performance if you can benefit of the features of the new version of ALB
  3. reducing costs and optimizing performance are most of the time counter opposites.
  • If you want to reduce costs you can look at using smaller instance sizes (less memory/cpus).
  • If you want to improve performance you should look at instance types but most of the time the biggest boost is found in optimizing database calls / caching / queueing tasks which can also be handled asynchronously. (for ex. most applications start with sending e-mails/notifications synchronously. By doing this async, as in pushing these messages to a queue, can significantly improve performance.)

General suggestion: use application profiling tools (New Relic/Datadog/Kibana's apm app) or load testing tools (for ex. Apache JMeter) on your application to simulate, benchmark and test your specific application on different instance types / sizes to get a better view where your specific bottlenecks are.

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