summaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authorSebastian Pop2017-11-28 16:36:48 -0600
committerSebastian Pop2017-11-29 09:44:28 -0600
commit1f93d71022cca7bb6bb9eec49693c511bf9f46a9 (patch)
treeca915f721142e59d769cc80e483353b21c914f2f /libutils/OWNERS
parentc021b75cfd067963eb40d18b6be893cdde60943f (diff)
downloadplatform-system-core-1f93d71022cca7bb6bb9eec49693c511bf9f46a9.tar.gz
platform-system-core-1f93d71022cca7bb6bb9eec49693c511bf9f46a9.tar.xz
platform-system-core-1f93d71022cca7bb6bb9eec49693c511bf9f46a9.zip
use std::hash instead of hashing byte by byte
This patch uses libcxx's string_view hashing. The performance is better than the current implementation, and almost the same as for the hashing implementation amended by the patch in https://android-review.googlesource.com/404742 The following experiments were conducted on a HiKey aarch64 A53. No changes: $ adb push out/target/product/hikey/data/benchmarktest64/ziparchive-benchmarks /data $ adb shell /data/ziparchive-benchmarks --benchmark_repetitions=5 ----------------------------------------------------------------- Benchmark Time CPU Iterations ----------------------------------------------------------------- FindEntry_no_match 82279629 ns 81759676 ns 9 FindEntry_no_match 81648056 ns 81627431 ns 9 FindEntry_no_match 81384074 ns 81369057 ns 9 FindEntry_no_match 89618889 ns 82437755 ns 9 FindEntry_no_match 81811389 ns 81785261 ns 9 FindEntry_no_match_mean 83348407 ns 81795836 ns 9 FindEntry_no_match_stddev 3520421 ns 394962 ns 0 Iterate_all_files 137622000 ns 137589032 ns 5 Iterate_all_files 139666333 ns 138409469 ns 5 Iterate_all_files 150070000 ns 140883697 ns 5 Iterate_all_files 138600667 ns 138540646 ns 5 Iterate_all_files 137599833 ns 137567438 ns 5 Iterate_all_files_mean 140711767 ns 138598056 ns 5 Iterate_all_files_stddev 5299929 ns 1354928 ns 0 $ cd system/core/libziparchive $ git fetch https://android.googlesource.com/platform/system/core refs/changes/42/404742/7 && git cherry-pick FETCH_HEAD $ mma $ cd - $ adb push out/target/product/hikey/data/benchmarktest64/ziparchive-benchmarks /data $ adb shell /data/ziparchive-benchmarks --benchmark_repetitions=5 ----------------------------------------------------------------- Benchmark Time CPU Iterations ----------------------------------------------------------------- FindEntry_no_match 53302756 ns 53291178 ns 13 FindEntry_no_match 54314487 ns 54272272 ns 13 FindEntry_no_match 53866923 ns 53851178 ns 13 FindEntry_no_match 53324423 ns 53317296 ns 13 FindEntry_no_match 53289231 ns 53289159 ns 13 FindEntry_no_match_mean 53619564 ns 53604216 ns 13 FindEntry_no_match_stddev 458449 ns 443527 ns 0 Iterate_all_files 128211111 ns 112254783 ns 6 Iterate_all_files 110695000 ns 110677726 ns 6 Iterate_all_files 109351250 ns 109350998 ns 6 Iterate_all_files 109367500 ns 109367796 ns 6 Iterate_all_files 110872222 ns 110591407 ns 6 Iterate_all_files_mean 113699417 ns 110448542 ns 6 Iterate_all_files_stddev 8143723 ns 1194577 ns 0 $ cd system/core/libziparchive $ git checkout HEAD~ $ git am 0001-use-std-hash.patch $ mma $ cd - $ adb push out/target/product/hikey/data/benchmarktest64/ziparchive-benchmarks /data $ adb shell /data/ziparchive-benchmarks --benchmark_repetitions=5 ----------------------------------------------------------------- Benchmark Time CPU Iterations ----------------------------------------------------------------- FindEntry_no_match 55339872 ns 55195112 ns 13 FindEntry_no_match 56232628 ns 56069924 ns 13 FindEntry_no_match 55694103 ns 55255946 ns 13 FindEntry_no_match 55275064 ns 55120136 ns 13 FindEntry_no_match 54971987 ns 54944411 ns 13 FindEntry_no_match_mean 55502731 ns 55317106 ns 13 FindEntry_no_match_stddev 482032 ns 436766 ns 0 Iterate_all_files 114618611 ns 114487804 ns 6 Iterate_all_files 112552917 ns 112229801 ns 6 Iterate_all_files 111288750 ns 111255044 ns 6 Iterate_all_files 111291528 ns 111259045 ns 6 Iterate_all_files 114347222 ns 113677119 ns 6 Iterate_all_files_mean 112819806 ns 112581763 ns 6 Iterate_all_files_stddev 1606214 ns 1454858 ns 0 Change-Id: I1e3413d331bcb460ca38bc2c87e23f89b456cd2f
Diffstat (limited to 'libutils/OWNERS')
0 files changed, 0 insertions, 0 deletions