The Amazon EC2 instance Type t2 provide a short burst performance at much cheaper prices. This is a visual aid to understanding the CPU credits accumulation and burst performance. Presented by http://www.aws-simplified.com and burst rate explained in visual manner

1. Understanding Amazon AWS EC2 -
t2 Instance type CPU Credits
t2 CPU credits accumulation
and burst rate explained in
visual manner
Presented by : http://www.aws-simplified.com

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Typical CPU Consumption: CPU
Credits are used as they are
accumulated. No credits expire
during baseline performance.
T2 promises baseline performance
which is always available. This
should be your regular load
requirement.
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The CPU credits accumulate
when the instance is idle or
compute usage is below baseline
performance.
The EC2 t2 instance is suitable for
variable load with periodic burst
performance.
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The credits are accumulated in a
finite sized credit bucket.
The periodic burst performance is
made possible for the CPU credit
bucket.
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The CPU credits have expiry
stamped on them. Unused credits
are lost after expiry time period.
Select the instance size accordingly
to optimally use the credits without
losing much to expiry.
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Burst rate is really like opening a
tap to empty the vessel. You can
use what you have accumulated
The t2 credit buckets make it
possible to achieve periodic higher
performance provided by larger
EC2 instances at lower price
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Burst rate consumption will
continue as long as bucket has
enough credits.
The Amazon EC2 makes the
transition from burst rate to
baselines as gradual as possible to
avoid shock to your application.
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As the credits bucket comes
close to being empty the CPU
credits consumption will be
gradually throttled to baseline
level The Amazon EC2 makes the
transition from burst rate to
baselines as gradual as possible to
avoid shock to your application.
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Once the credits are depleted the
t2 instance performance only at
baseline performance.
T2 instance is highly useful in
cutting down AWS costs is usage
patterns are designed to match the
credits burst rate consumption.
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