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https://issues.apache.org/jira/browse/MRESOLVER-138?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Osipov closed MRESOLVER-138.
------------------------------------
Resolution: Fixed
Fixed by subtasks.
> MRESOLVER-56 introduces several performance regressions
> -------------------------------------------------------
>
> Key: MRESOLVER-138
> URL: https://issues.apache.org/jira/browse/MRESOLVER-138
> Project: Maven Resolver
> Issue Type: Bug
> Components: resolver
> Affects Versions: 1.6.0
> Reporter: Michael Osipov
> Assignee: Michael Osipov
> Priority: Major
> Fix For: 1.6.1
>
>
> As discussed on the dev ML, [~dantran] found out that additionally
> downloading SHA-512 and SHA-256 when both aren't there introduces a huge
> performance break because of the rounds. {{SimpleDigest}} requires also more
> time with SHA-512. My personal tests with various setups shows at least a 50%
> toll in resolution time.
> Ant Resolver Tasks:
> {noformat}
> master:SHA-512,SHA-256,SHA-1,MD5:central-mirror
> 24,20 real 40,09 user 4,11 sys
> master:SHA-512,SHA-256,SHA-1,MD5:central-mirror-sha256
> 24,67 real 45,04 user 3,89 sys
> master:SHA-512,SHA-256,SHA-1,MD5:central-mirror-sha1-md5
> 24,37 real 40,02 user 4,20 sys
> master:SHA-512,SHA-256:central-mirror
> 33,34 real 39,65 user 4,56 sys
> master:SHA-512,SHA-256:central-mirror-sha256
> 43,42 real 45,75 user 4,93 sys
> master:SHA-512,SHA-256:central-mirror-sha1-md5
> 44,30 real 46,01 user 5,13 sys
> master:SHA-1,MD5:central-mirror
> 22,62 real 37,27 user 3,86 sys
> master:SHA-1,MD5:central-mirror-sha256
> 22,69 real 37,08 user 4,10 sys
> master:SHA-1,MD5:central-mirror-sha1-md5
> 22,81 real 37,85 user 4,00 sys
> master:SHA-512:central-mirror
> 32,20 real 33,65 user 4,80 sys
> master:SHA-512:central-mirror-sha256
> 33,61 real 39,75 user 4,48 sys
> master:SHA-512:central-mirror-sha1-md5
> 33,39 real 36,00 user 4,12 sys
> master:SHA-256:central-mirror
> 32,66 real 36,49 user 4,80 sys
> master:SHA-256:central-mirror-sha256
> 32,35 real 35,41 user 4,44 sys
> master:SHA-256:central-mirror-sha1-md5
> 33,44 real 37,12 user 4,12 sys
> digest-fix:SHA-512,SHA-256,SHA-1,MD5:central-mirror
> 24,59 real 44,12 user 4,05 sys
> digest-fix:SHA-512,SHA-256,SHA-1,MD5:central-mirror-sha256
> 24,69 real 43,62 user 4,27 sys
> digest-fix:SHA-512,SHA-256,SHA-1,MD5:central-mirror-sha1-md5
> 24,68 real 43,97 user 4,28 sys
> digest-fix:SHA-512,SHA-256:central-mirror
> 33,53 real 42,76 user 4,35 sys
> digest-fix:SHA-512,SHA-256:central-mirror-sha256
> 43,16 real 41,90 user 5,12 sys
> digest-fix:SHA-512,SHA-256:central-mirror-sha1-md5
> 44,00 real 45,75 user 5,24 sys
> digest-fix:SHA-1,MD5:central-mirror
> 22,47 real 33,67 user 4,02 sys
> digest-fix:SHA-1,MD5:central-mirror-sha256
> 22,90 real 37,95 user 4,08 sys
> digest-fix:SHA-1,MD5:central-mirror-sha1-md5
> 22,62 real 33,96 user 4,00 sys
> digest-fix:SHA-512:central-mirror
> 32,28 real 34,07 user 4,65 sys
> digest-fix:SHA-512:central-mirror-sha256
> 33,84 real 34,90 user 4,37 sys
> digest-fix:SHA-512:central-mirror-sha1-md5
> 33,72 real 37,18 user 4,31 sys
> digest-fix:SHA-256:central-mirror
> 32,36 real 35,70 user 4,39 sys
> digest-fix:SHA-256:central-mirror-sha256
> 32,51 real 37,18 user 4,57 sys
> digest-fix:SHA-256:central-mirror-sha1-md5
> 33,36 real 37,88 user 4,50 sys
> master:SHA-512,SHA-256,SHA-1,MD5:central-direct
> 274,93 real 54,14 user 7,38 sys
> master:SHA-512,SHA-256:central-direct
> 218,85 real 48,71 user 6,61 sys
> master:SHA-1,MD5:central-direct
> 158,51 real 42,59 user 6,05 sys
> master:SHA-512:central-direct
> 163,33 real 43,27 user 5,95 sys
> master:SHA-256:central-direct
> 167,36 real 41,50 user 6,07 sys
> digest-fix:SHA-512,SHA-256,SHA-1,MD5:central-direct
> 247,74 real 54,25 user 7,07 sys
> digest-fix:SHA-512,SHA-256:central-direct
> 204,89 real 47,79 user 6,49 sys
> digest-fix:SHA-1,MD5:central-direct
> 166,66 real 42,36 user 6,03 sys
> digest-fix:SHA-512:central-direct
> 164,31 real 38,98 user 6,10 sys
> digest-fix:SHA-256:central-direct
> 170,77 real 44,77 user 5,79 sys
> {noformat}
> as well as Maven 3.7.0-SNAPSHOT:
> {noformat}
> master:SHA-512,SHA-256,SHA-1,MD5:central-direct
> 271,06 real 65,54 user 7,67 sys
> master:SHA-512,SHA-256:central-direct
> 202,95 real 60,87 user 6,77 sys
> master:SHA-1,MD5:central-direct
> 163,64 real 50,00 user 6,85 sys
> master:SHA-512:central-direct
> 165,11 real 50,17 user 6,25 sys
> master:SHA-256:central-direct
> 163,97 real 52,24 user 5,81 sys
> digest-fix:SHA-512,SHA-256,SHA-1,MD5:central-direct
> 268,27 real 64,90 user 7,73 sys
> digest-fix:SHA-512,SHA-256:central-direct
> 211,50 real 61,39 user 6,76 sys
> digest-fix:SHA-1,MD5:central-direct
> 165,67 real 52,25 user 6,66 sys
> digest-fix:SHA-512:central-direct
> 155,26 real 50,90 user 6,45 sys
> digest-fix:SHA-256:central-direct
> 162,91 real 51,20 user 6,31 sys
> master:SHA-512,SHA-256,SHA-1,MD5:central-proxy
> 42,47 real 63,41 user 6,46 sys
> master:SHA-512,SHA-256:central-proxy
> 36,54 real 53,11 user 5,65 sys
> master:SHA-1,MD5:central-proxy
> 29,60 real 42,90 user 5,18 sys
> master:SHA-512:central-proxy
> 29,50 real 42,07 user 5,21 sys
> master:SHA-256:central-proxy
> 30,04 real 43,57 user 5,34 sys
> digest-fix:SHA-512,SHA-256,SHA-1,MD5:central-proxy
> 42,91 real 62,70 user 6,92 sys
> digest-fix:SHA-512,SHA-256:central-proxy
> 36,36 real 54,39 user 5,54 sys
> digest-fix:SHA-1,MD5:central-proxy
> 29,80 real 44,50 user 5,56 sys
> digest-fix:SHA-512:central-proxy
> 29,53 real 42,57 user 5,23 sys
> digest-fix:SHA-256:central-proxy
> 30,17 real 43,14 user 5,18 sys
> {noformat}
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