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2012.06.01

Why are AWS Command-Line Tools so Slow?

Amazon's Elastic Compute Cloud command-line tools are useful building blocks for creating more complex shell scripts. They allow you to start and stop instances, get their status, add tags, manage storage, IP addresses, and so on. They have one big disadvantage: they take a long time to run. For instance, running ec2-describe-instances for six instances takes 19 seconds on an m1.small AWS Linux instance. One answer given, is that this is caused by JVM startup overhead. I found that hard to believe, because on the same machine a Java "hello world" program executes in 120ms, and running ec2-describe-instances --help takes just 321ms. So I set out to investigate, and, using multiple tracing tools and techniques, this is what I found.

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