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generate-commits-fast.md

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Generate many commits fast

It is sometimes interesting to generate a ton of commits to test some edge case, but it is not trivial to go way above 1000 commits in a reasonable amount of time.

Bottom line: don't use git. The manual Python code under other-test-repos presents a huge speedup. TODO: try gitlib2.

1000 operations take on a my computer:

  • echo to file, add and commit: 43s
  • empty commit with --allow-empt: 23s
  • openssl dgst -sha1: 22s
  • git hash-object --stdin -w: 21s
  • git hash-object --stdin: 20s
  • sha1sum Coreutils: 1.4s.
  • touch: 0.9s (same on ramfs).
  • time python3 <(printf 'import hashlib; import sys;\nfor i in range(1000): print(hashlib.sha1(str(i).encode("ascii")).hexdigest())'): 0.14s TODO: why so much faster than hash-object? This is minimum bottleneck per CPU.