From 2e04e5dda9cd1718b11275bc3616fe974cde2aa1 Mon Sep 17 00:00:00 2001 From: Martijn Dwars Date: Thu, 13 Oct 2016 22:43:46 +0200 Subject: [PATCH] Improvements --- README.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/README.md b/README.md index bf2f4a8..2bc26a5 100644 --- a/README.md +++ b/README.md @@ -726,7 +726,7 @@ EC2 - 🔸Periodically you may find that your server or load balancer is receiving traffic for (presumably) a previous EC2 server that was running at the same IP address that you are handed out now (this may not matter, or it can be fixed by migrating to another new instance). - ❗If the EC2 API itself is a critical dependency of your infrastructure (e.g. for automated server replacement, custom scaling algorithms, etc.) and you are running at a large scale or making many EC2 API calls, make sure that you understand when they might fail (calls to it are [rate limited](http://docs.aws.amazon.com/AWSEC2/latest/APIReference/query-api-troubleshooting.html#api-request-rate) and the limits are not published and subject to change) and code and test against that possibility. - ❗Many newer EC2 instance types are EBS-only. Make sure to factor in EBS performance and costs when planning to use them. -- 🔸Instances come in two types: Fixed Performance Instances (e.g. M3, C3, and R3) and Burstable Performance Instances (e.g. T2). Each T2 instance receives CPU Credits continuously, the rate of which depends on the instance size. T2 instances accrue CPU Credits when they are idle, and use CPU credits when they are active. However, once it runs out of credits, you'll notice a severe degrade in performance. CPU-bound tasks (such as scientific computation) are therefore better suited for Fixed Performance Instances. +- 🔸Instances come in two types: Fixed Performance Instances (e.g. M3, C3, and R3) and [Burstable Performance Instances](https://aws.amazon.com/ec2/instance-types/#burst) (e.g. T2). A T2 instance receives CPU credits continuously, the rate of which depends on the instance size. T2 instances accrue CPU credits when they are idle, and use CPU credits when they are active. However, once an instance runs out of credits, you'll notice a severe degradation in performance. If you need consistently high CPU performance for applications such as video encoding, high volume websites or HPC applications, it is recommended to use Fixed Performance Instances. AMIs ----