降级go编译器后编译速度变慢

Question

I recently got upgraded from Go 1.8.4 to 1.9 without knowing it. Compilation speed wasn't affect (not noticed at least). But I had problem with tools like guru, so I uninstalled 1.9 and re-installed 1.8.4. Afterwards, go run foo.go becomes pretty slow. I'm suspecting that the older version of the compiler cannot use cache from 1.9 and had to recompile everything from scratch - I have no prove.

Is my suspicion correct? If so, is there a way I can reset the compiler cache?

Answer 1

Delete the folder $GOPATH\pkg. That is the package cache folder.

If you run the compiler with the -v flag it will list all the packages being compiled. If it keeps compiling the same packages that you have not changed then you know it is not using the cache.

In the past I have found that when compiling code with run/build the compiler does not cache packages, but it does cache them when using install.