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Amazon Elastic Compute Cloud
User Guide for Windows Instances

T2 Standard

A T2 Standard instance is suited to workloads with an average CPU utilization that is consistently below the baseline performance of the instance. The instance uses credits that it has accrued in its CPU credit balance to burst above the baseline. If the instance is running low on accrued credits, performance is gradually lowered to the baseline performance level over a 15-minute period, so that the instance does not experience a sharp performance drop-off when its accrued CPU credit balance is depleted. For more information, see CPU Credits and Baseline Performance.

Tip

To ensure that your workloads always get the performance they need, switch to T2 Unlimited or consider using a larger T2 instance size. For more information, see T2 Unlimited.

Launch Credits

T2 Standard instances get 30 launch credits per vCPU at launch. For example, a t2.micro has one vCPU and gets 30 launch credits, while a t2.xlarge has four vCPUs and gets 120 launch credits. Launch credits are designed to provide a good startup experience to allow applications to burst immediately after launch before they can accumulate a CPU credit balance.

There are limits to how many T2 instances can launch or start with launch credits. By default, this is set to 100 launches or starts of any T2 instance per account, per 24-hour period, per region. New accounts may have a lower limit, which increases over time based on your usage.

Launch credits are used first and do not count towards the maximum number of earned CPU credits that can be accrued. For example, a t2.micro instance that is launched and then remains idle for over 24 hours can reach a credit balance of up to 174 (30 launch credits + 144 earned credits). However, after the instance uses the 30 launch credits, the credit balance can never exceed 144. For more information about the maximum earned CPU credit balance for each T2 instance size, see the T2 credit table.

The following table lists the initial CPU credit allocation received at launch or start, and the number of vCPUs.

Instance type

Launch credits

vCPUs

t2.nano

30

1

t2.micro

30

1

t2.small

30

1

t2.medium

60

2

t2.large

60

2

t2.xlarge

120

4

t2.2xlarge

240

8