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* Updated docs, cleaned things up, DRY's up function format stuff. * deleted files * updated bad link
16 lines
928 B
Markdown
16 lines
928 B
Markdown
# Hot functions
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By default, Fn uses "cold functions" where every request starts up a new container, feeds it with the payload then sends the
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answer back to the caller. You can expect an average start time of [300ms per execution]((https://medium.com/travis-on-docker/the-overhead-of-docker-run-f2f06d47c9f3#.96tj75ugb)) to start the function/container.
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Hot functions improve performance by starting a function then keeping it alive to handle additional requests. This
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makes it a bit trickier to use because you'll have to parse a stream of requests, but if you use an [FDK](fdks.md) it's
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all taken care of for you, so you should probably use an FDK in most cases.
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## Making a hot function
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In your `func.yaml`, add `format: json`.
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From there, we recommend using one of our [FDKs](fdks.md) to handle all the parsing and formatting. But if you'd like to learn
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about the nitty gritty details, [check here](function-format.md).
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