Add metadata benchmarks#1055
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File names must be random since we use them to traverse the fs tree when creating the DB and so RandString does not use our seeded random. We still use a fixed size, so there shouldn't be any variance between runs.
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If we used the seeded random all our filenames would be the same and the only thing differentiating them would be depth level (eg: file vs file/file vs file/file/file).
When looping through the TOC we maintain a map of node ID to metadata entry. The metadata entry has a map of the nodes children where the child name is the key. When we are adding children to the metadata entry of a node we will end up overwriting any existing children if they share the same name, which never happens in practice since you cannot multiple children nodes/files with the same name under a single parent node/directory. This means that our metadata/nodes bucket will not be fully populated, since a parent can really only have 1 child.
To avoid this, we use rand so we can get an actual pseudo random string. We still use a fixed length of 10 for the filename, to ensure their isn't any variance in bbolt write performance between benchmark runs. (bbolt doesn't care about the content of a KV pair since they are just interpreted as byte slices; the length, however, does matter since it controls how nodes/pages are split before writing to disk).
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Note: Since we want to measure write performance to disk, we have to write to non tmpfs location
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Add benchmarks functions that benchmark sequential and concurrent writes to the underlying metadata db. Signed-off-by: Yasin Turan <turyasin@amazon.com>
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Issue #, if available:
Description of changes:
Add benchmark tests that benchmark metadata DB insertion performance. Added a helper function to generate random TAR file (TOC) with given number of files/entries.
Testing performed:
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