What about after you've installed dependencies? (go build -i or go install)

it's significantly faster if not removing the pkg and doing go build -i at the first time..

1.5.2
CPU: 3.03s      Real: 1.99s     RAM: 243676KB
CPU: 3.04s      Real: 1.96s     RAM: 238416KB
CPU: 3.04s      Real: 1.96s     RAM: 238348KB

but still far slower than

1.4.2
CPU: 0.88s      Real: 0.99s     RAM: 207080KB
CPU: 0.93s      Real: 0.99s     RAM: 207000KB
CPU: 0.87s      Real: 1.00s     RAM: 207084KB

Isn't a 2x slowdown between 1.4 and 1.5 expected? See https://golang.org/doc/go1.5#performance

Builds in Go 1.5 will be slower by a factor of about two

it got lot worse on windows 8,1 64-bit, with slower processor but SSD harddisk

1.4.3

$ time go build

real 0m7.670s
user 0m0.015s
sys 0m0.000s

real 0m6.886s
user 0m0.000s
sys 0m0.000s

real 0m7.280s
user 0m0.000s
sys 0m0.000s

1.5.3

real 0m15.825s
user 0m0.000s
sys 0m0.000s

real 0m17.916s
user 0m0.000s
sys 0m0.000s

real 0m16.444s
user 0m0.000s
sys 0m0.000s

i got even worse result on Mac OSX 64-bit mid-2012 (i7-3xxx, 16GB, SSD)

$ rm -rf $GOPATH/pkg/* 2>1 > /dev/null; go version ; time go build
go version go1.4.3 darwin/amd64

real    0m43.886s
user    0m45.049s
sys 0m2.789s

Much has been done on this in Go 1.7. There will be more in 1.8.

Much has been done on this in Go 1.8. There will be more in 1.9.

I dont understand why my friend who is compiling the same code on his
i5 6200 cpu on his laptop compiles at around 1.4 seconds and my i7 6700k cpu
on my desktop compiles at 6 seconds. go 1.7.3

maybe ssd

On Nov 6, 2016 11:36 AM, "McGyver-" notifications@github.com wrote:

I dont understand why my friend who is compiling the same code on his
i5 6200 cpu on his laptop compiles at around 1.4 seconds and my i7 6700k
cpu
on my desktop compiles at 6 seconds. go 1.7.3

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@kokizzu Nope my Desktop has no hard disk only ssd. 16gb ram.
Im wondering if there is something wrong with config but i dont think i have anything different
especially since im the one who set up go on my friends laptop im pretty sure
i performed the same steps.

here is my go env
set GOARCH=amd64
set GOBIN=C:\Users\Something\Documents\CodeProjects\Go\bin
set GOEXE=.exe
set GOHOSTARCH=amd64
set GOHOSTOS=windows
set GOOS=windows
set GOPATH=C:\Users\Something\Documents\CodeProjects\Go
set GORACE=
set GOROOT=C:\Go
set GOTOOLDIR=C:\Go\pkg\tool\windows_amd64
set CC=gcc
set GOGCCFLAGS=-m64 -mthreads -fmessage-length=0
set CXX=g++
set CGO_ENABLED=1

Let's move this conversation to a mailing list. This is just a tracking bug.

Performance check :3 rm -rf $GOPATH/pkg/* 2>1 > /dev/null; go version ; time go build

the exact same project as the first one, 1.5 or below not tested because the code no longer compatible.

go version go1.6.3 linux/amd64

CPU: 93.47s     Real: 36.97s    RAM: 470020KB
CPU: 91.22s     Real: 36.26s    RAM: 463844KB

go version go1.7.3 linux/amd64

CPU: 64.09s     Real: 31.05s    RAM: 353952KB
CPU: 64.95s     Real: 31.23s    RAM: 352440KB

go version go1.8beta1 linux/amd64

CPU: 56.83s     Real: 29.00s    RAM: 352572KB
CPU: 59.78s     Real: 30.26s    RAM: 354760KB

The link http://seblu.net/a/archive/packages/g/go/ leads to a 404. Do you have an updated place to go find the code which is slow to compile? Thanks.

@josharian seblu.net was a place to look archlinux package archive (now i'm using agetpkg-git), not code that slow to compile. The code itself is owned by my previous company i've been working to, so i can't publish it here. it's about 122K LOC (4.6 MB of source code).

current benchmark

alias time='/usr/bin/time -f "\nCPU: %Us\tReal: %es\tRAM: %MKB"'
rm -rf $GOPATH/pkg/ ; go version ; time go build

go version go1.6.3 linux/amd64
CPU: 93.02s     Real: 37.26s    RAM: 488024KB

go version go1.7.5 linux/amd64
CPU: 66.35s     Real: 31.31s    RAM: 353620KB

go version go1.8 linux/amd64
CPU: 58.85s     Real: 29.63s    RAM: 353604KB

go 1.5 and 1.4 no longer able to compile (break with go-sqlcipher and mime/quotedprintable)

If you're looking for large go source code to compile, you can try juju or docker.

It is well known that compilation times are slower from 1.5 on and that they are getting slowly better (as your current benchmarks show).

There are many different things that may make some code particularly slow to compile. Without actual code to work with, there's nothing to be done here. I'm going to close this. If/when there's code to look at, feel free to leave a comment and I'll reopen.