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memdb already knows how to search by prefix so there is no need to keep a separate list of container ids in the truncindex Benchmarks: $ go test -benchmem -run=^$ -count 5 -tags linux -bench ^BenchmarkDBGetByPrefix100$ github.com/docker/docker/container goos: linux goarch: amd64 pkg: github.com/docker/docker/container cpu: Intel(R) Core(TM) i9-8950HK CPU @ 2.90GHz BenchmarkDBGetByPrefix100-6 16018 73935 ns/op 33888 B/op 1100 allocs/op BenchmarkDBGetByPrefix100-6 16502 73150 ns/op 33888 B/op 1100 allocs/op BenchmarkDBGetByPrefix100-6 16218 74014 ns/op 33856 B/op 1100 allocs/op BenchmarkDBGetByPrefix100-6 15733 73370 ns/op 33792 B/op 1100 allocs/op BenchmarkDBGetByPrefix100-6 16432 72546 ns/op 33744 B/op 1100 allocs/op PASS ok github.com/docker/docker/container 9.752s $ go test -benchmem -run=^$ -count 5 -tags linux -bench ^BenchmarkTruncIndexGet100$ github.com/docker/docker/pkg/truncindex goos: linux goarch: amd64 pkg: github.com/docker/docker/pkg/truncindex cpu: Intel(R) Core(TM) i9-8950HK CPU @ 2.90GHz BenchmarkTruncIndexGet100-6 16862 73732 ns/op 44776 B/op 1173 allocs/op BenchmarkTruncIndexGet100-6 16832 73629 ns/op 45184 B/op 1179 allocs/op BenchmarkTruncIndexGet100-6 17214 73571 ns/op 45160 B/op 1178 allocs/op BenchmarkTruncIndexGet100-6 16113 71680 ns/op 45360 B/op 1182 allocs/op BenchmarkTruncIndexGet100-6 16676 71246 ns/op 45056 B/op 1184 allocs/op PASS ok github.com/docker/docker/pkg/truncindex 9.759s $ go test -benchmem -run=^$ -count 5 -tags linux -bench ^BenchmarkDBGetByPrefix500$ github.com/docker/docker/container goos: linux goarch: amd64 pkg: github.com/docker/docker/container cpu: Intel(R) Core(TM) i9-8950HK CPU @ 2.90GHz BenchmarkDBGetByPrefix500-6 1539 753541 ns/op 169381 B/op 5500 allocs/op BenchmarkDBGetByPrefix500-6 1624 749975 ns/op 169458 B/op 5500 allocs/op BenchmarkDBGetByPrefix500-6 1635 761222 ns/op 169298 B/op 5500 allocs/op BenchmarkDBGetByPrefix500-6 1693 727856 ns/op 169297 B/op 5500 allocs/op BenchmarkDBGetByPrefix500-6 1874 710813 ns/op 169570 B/op 5500 allocs/op PASS ok github.com/docker/docker/container 6.711s $ go test -benchmem -run=^$ -count 5 -tags linux -bench ^BenchmarkTruncIndexGet500$ github.com/docker/docker/pkg/truncindex goos: linux goarch: amd64 pkg: github.com/docker/docker/pkg/truncindex cpu: Intel(R) Core(TM) i9-8950HK CPU @ 2.90GHz BenchmarkTruncIndexGet500-6 1934 780328 ns/op 224073 B/op 5929 allocs/op BenchmarkTruncIndexGet500-6 1713 713935 ns/op 225011 B/op 5937 allocs/op BenchmarkTruncIndexGet500-6 1780 702847 ns/op 224090 B/op 5943 allocs/op BenchmarkTruncIndexGet500-6 1736 711086 ns/op 224027 B/op 5929 allocs/op BenchmarkTruncIndexGet500-6 2448 508694 ns/op 222322 B/op 5914 allocs/op PASS ok github.com/docker/docker/pkg/truncindex 6.877s Signed-off-by: Djordje Lukic <djordje.lukic@docker.com>
pkg/ is a collection of utility packages used by the Moby project without being specific to its internals.
Utility packages are kept separate from the moby core codebase to keep it as small and concise as possible. If some utilities grow larger and their APIs stabilize, they may be moved to their own repository under the Moby organization, to facilitate re-use by other projects. However that is not the priority.
The directory pkg is named after the same directory in the camlistore project. Since Brad is a core
Go maintainer, we thought it made sense to copy his methods for organizing Go code :) Thanks Brad!
Because utility packages are small and neatly separated from the rest of the codebase, they are a good place to start for aspiring maintainers and contributors. Get in touch if you want to help maintain them!