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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>