Greetings Robert: 

I'd think its a good idea to move to a newer version of mvn, if we are
getting performance improvements. 
Please open a ticket on the helpdesk so that this can get picked up from
the queue.

Thanks,
Anil




On Mon, Sep 30, 2019 at 5:56 PM Robert Varga <nite@...
<mailto:nite@...>> wrote:

Hello,

maven-3.6.2 is out and it contains major improvements in startup time
(i.e. figuring out what to do).

Local testing of 'mvn help' on controller yields the following:

> nite@nitebug : ~/odl/controller on master $ time
~/local/apache-maven-3.5.4/bin/mvn help >/dev/null
>
> real    0m7.591s
> user    0m33.862s
> sys     0m0.806s
> nite@nitebug : ~/odl/controller on master $ time
~/local/apache-maven-3.6.0/bin/mvn help >/dev/null
>
> real    0m5.505s
> user    0m22.748s
> sys     0m0.691s
> nite@nitebug : ~/odl/controller on master $ time
~/local/apache-maven-3.6.2/bin/mvn help >/dev/null
>
> real    0m3.436s
> user    0m13.337s
> sys     0m0.522s

i.e. saving 20 seconds (60%) of CPU time and 4 seconds of wall time
(55%) from controller build.

Looking at autorelese, this startup time now takes:

> 00:40:33  Apache Maven 3.5.3
(3383c37e1f9e9b3bc3df5050c29c8aff9f295297; 2018-02-24T19:49:05Z)
> 00:40:33  Maven home:
/w/tools/hudson.tasks.Maven_MavenInstallation/mvn35
> 00:40:33  Java version: 1.8.0_222, vendor: Oracle Corporation
> 00:40:33  Java home:
/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.222.b10-0.el7_6.x86_64/jre
> 00:40:33  Default locale: en_US, platform encoding: UTF-8
> 00:40:33  OS name: "linux", version: "3.10.0-957.12.2.el7.x86_64",
arch: "amd64", family: "unix"
> 00:40:34  [INFO] Error stacktraces are turned on.
> 00:40:34  [INFO] Scanning for projects...
> 00:41:19  [WARNING]

i.e. 45 seconds of wall time @jenkins. Local testing (with Java 11,
sorry) shows:

> nite@nitebug : ~/odl/autorelease on master $ time
~/local/apache-maven-3.5.4/bin/mvn help >/dev/null
>
> real    0m38.492s
> user    3m48.811s
> sys     0m2.093s
> nite@nitebug : ~/odl/autorelease on master $ time
~/local/apache-maven-3.6.0/bin/mvn help >/dev/null
>
> real    0m27.265s
> user    2m46.288s
> sys     0m1.512s
> nite@nitebug : ~/odl/autorelease on master $ time
~/local/apache-maven-3.6.2/bin/mvn help >/dev/null
>
> real    0m10.237s
> user    0m50.400s
> sys     0m1.550s


Would it not make sense to switch to maven-3.6.2?

Regards,
Robert
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