After modifying the build.go, now i know that the slow compiling problem in my project is some package keep being recompiled even when there are no changes..

go build -i -v

Test1/db/model
[2198.86] /usr/lib/go/pkg/tool/linux_amd64/compile 
Test1/ajax
Test1/db/transform
[423.75] /usr/lib/go/pkg/tool/linux_amd64/compile 
[3115.87] /usr/lib/go/pkg/tool/linux_amd64/compile 
Test1/db/migrate
[883.56] /usr/lib/go/pkg/tool/linux_amd64/compile 
Test1/page
[1003.04] /usr/lib/go/pkg/tool/linux_amd64/compile 
Test1
[352.51] /usr/lib/go/pkg/tool/linux_amd64/compile 
[2618.77] /usr/lib/go/pkg/tool/linux_amd64/link 

db/migrate and db/transform rarely used and it increase the compiling duration by 4 seconds, after removing those packages:

Test1/db/model
[2149.55] /usr/lib/go/pkg/tool/linux_amd64/compile 
Test1/ajax
Test1/page
[1188.99] /usr/lib/go/pkg/tool/linux_amd64/compile 
[3655.12] /usr/lib/go/pkg/tool/linux_amd64/compile 
Test1
[481.60] /usr/lib/go/pkg/tool/linux_amd64/compile 
[3028.78] /usr/lib/go/pkg/tool/linux_amd64/link 

this is just an example how useful is to show the timing for each package.

        start := time.Now()
        ...
        err := cmd.Run()
        ...
        elapsed := float64(time.Since(start).Nanoseconds())
        fmt.Printf("[%.2f] %s \n", ...

Something like #15736?

ah yeah XD so this is a duplicate..

Cool. Hopefully -trace support will land in 1.8.

Have a look at the toolexec flag, you can use that to inject /use/bin/time
as a prefix to the command.

Also, the -v flag will print each package as it compiled, this should give
you a rough ballpark of the slow to compile packages.

Lastly. If you are concerned about compilation time, prefer go install to
go build.

On Thu, 14 Jul 2016, 09:03 Kiswono Prayogo notifications@github.com wrote:

When doing go build -i -x, it outputs something like this

[go] cd /home/asd/MEGA/go/src/Test1
[go] /usr/lib/go/pkg/tool/linux_amd64/compile -o $WORK/Test1.a -trimpath $WORK -p main -complete -buildid 6d6a870e9806648c308d01500862acf24009cb43 -D _/home/asd/MEGA/go/src/Test1 -I $WORK -I /home/asd/MEGA/go/pkg/linux_amd64 -pack ./assets.go ./oauth.go ./router.go ./server.go
[go] cd .
[go] /usr/lib/go/pkg/tool/linux_amd64/link -o $WORK/Test1/_obj/exe/a.out -L $WORK -L /home/asd/MEGA/go/pkg/linux_amd64 -extld=gcc -buildmode=exe -buildid=6d6a870e9806648c308d01500862acf24009cb43 $WORK/Test1.a
[go] mkdir -p /tmp/
[go] mv $WORK/Test1/_obj/exe/a.out /tmp/gin-bin

it would be nice to see the timing for each execution:

[1 ms] cd /home/asd/MEGA/go/src/Test1
[124 ms] /usr/lib/go/pkg/tool/linux_amd64/compile -o $WORK/Test1.a
-trimpath $WORK -p main -complete -buildid
6d6a870e9806648c308d01500862acf24009cb43 -D _/home/asd/MEGA/go/src/Test1 -I
$WORK -I /home/asd/MEGA/go/pkg/linux_amd64 -pack ./assets.go ./oauth.go
./router.go ./server.go
[1 ms] cd .
[9124 ms] /usr/lib/go/pkg/tool/linux_amd64/link -o
$WORK/Test1/_obj/exe/a.out -L $WORK -L /home/asd/MEGA/go/pkg/linux_amd64
-extld=gcc -buildmode=exe -buildid=6d6a870e9806648c308d01500862acf24009cb43
$WORK/Test1.a
[1 ms] mkdir -p /tmp/
[1 ms] mv $WORK/Test1/_obj/exe/a.out /tmp/gin-bin

so I could see which package that are slow to rebuild.

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