outgoing: add a simple fastpath when there is no common This further speed up case like `hg bundle --all` for larger repository. ### data-env-vars.name = mozilla-try-2023-03-22-zstd-sparse-revlog # benchmark.name = hg.command.bundle # bin-env-vars.hg.flavor = default # bin-env-vars.hg.py-re2-module = default # benchmark.variants.revs = all # benchmark.variants.type = none-streamv2 before: 316.749699 after: 311.165461 (-1.76%, -5.58) There is further work to be done in this area like not doing any outgoing computation in the stream case for example. however the recent changes already gives use a large win for a small amount of local work. ### benchmark.name = hg.command.bundle # bin-env-vars.hg.flavor = default # bin-env-vars.hg.py-re2-module = default # benchmark.variants.revs = all # benchmark.variants.type = none-streamv2 ## data-env-vars.name = mercurial-public-2024-03-22-zstd-sparse-revlog pre-%ln-change: 1.263859 the-%ln-change: 0.700229 (-44.60%, -0.56) prev-changeset: 0.496050 (-60.75%, -0.77) this-changeset: 0.495243 (-60.81%, -0.77) ## data-env-vars.name = tryton-public-2024-03-22-zstd-sparse-revlog pre-%ln-change: 2.975765 the-%ln-change: 1.870798 (-37.13%, -1.10) prev-changeset: 1.461583 (-50.88%, -1.51) this-changeset: 1.469185 (-50.63%, -1.51) ## data-env-vars.name = pypy-2024-03-22-zstd-sparse-revlog pre-%ln-change: 4.540080 the-%ln-change: 3.401700 (-25.07%, -1.14) prev-changeset: 2.915810 (-35.78%, -1.62) this-changeset: 2.911643 (-35.87%, -1.63) ## data-env-vars.name = heptapod-public-2024-03-25-zstd-sparse-revlog pre-%ln-change: 10.138396 the-%ln-change: 7.750458 (-23.55%, -2.39) prev-changeset: 6.665565 (-34.25%, -3.47) this-changeset: 6.672078 (-34.19%, -3.47) ## data-env-vars.name = mozilla-try-2023-03-22-zstd-sparse-revlog pre-%ln-change: 399.484481 the-%ln-change: 346.508952 (-13.26%, -52.98) prev-changeset: 316.749699 (-20.71%, -82.73) this-changeset: 311.165461 (-22.11%, -88.32)

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https://bz.mercurial-scm.org/1877

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  $ hg init a

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  $ cd a

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  $ echo a > a

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  $ hg add a

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  $ hg ci -m 'a'

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  $ echo b > a

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  $ hg ci -m'b'

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  $ hg up 0

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  1 files updated, 0 files merged, 0 files removed, 0 files unresolved

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  $ hg book main

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  $ hg book

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   * main                      0:cb9a9f314b8b

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  $ echo c > c

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  $ hg add c

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  $ hg ci -m'c'

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  created new head

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  $ hg book

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   * main                      2:d36c0562f908

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  $ hg heads

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  changeset:   2:d36c0562f908

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  bookmark:    main

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  tag:         tip

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  parent:      0:cb9a9f314b8b

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  user:        test

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  date:        Thu Jan 01 00:00:00 1970 +0000

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  summary:     c

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  changeset:   1:1e6c11564562

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  user:        test

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  date:        Thu Jan 01 00:00:00 1970 +0000

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  summary:     b

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  $ hg up 1e6c11564562

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  1 files updated, 0 files merged, 1 files removed, 0 files unresolved

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  (leaving bookmark main)

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  $ hg merge main

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  1 files updated, 0 files merged, 0 files removed, 0 files unresolved

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  (branch merge, don't forget to commit)

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  $ hg book

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     main                      2:d36c0562f908

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  $ hg ci -m'merge'

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  $ hg book

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     main                      2:d36c0562f908

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  $ cd ..