How Can I Determine the Size of a Go Project?

Determining the Size of a Go Project

You may want to verify the size of a Go project for various reasons, such as optimizing disk space or estimating network transfer time. This article will guide you on how to effectively check the size of your Go projects.

Checking the Binary Size

For an executable project, you can determine its size by using the following steps:

1. Execute the command: go build
2. Locate the generated binary file in the current directory and check its file size using the ls -l command.

For example:

$ go build
$ ls -l my_program
-rwxr-xr-x 1 user user 65536 Apr 1 09:06 my_program

In this case, the binary file "my_program" is 65,536 bytes in size.

Checking the Library Size

For a package (library) that you are importing into your project, you can check its size by examining the $GOPATH/pkg directory. The size of the library binary can be found in the corresponding subdirectory.

For example, to check the size of the gorilla http packages, run the following commands:

$ go get -u github.com/gorilla/mux
$ go get -u github.com/gorilla/securecookie
$ go get -u github.com/gorilla/sessions
$ cd $GOPATH/pkg/darwin_amd64/github.com/gorilla/
$ du -k *

This will output the binary sizes of the installed gorilla http packages.

Note on De-duplication

It's important to note that Go's linker will automatically de-duplicate shared dependencies across packages. This means that, even if you import multiple packages that have the same dependencies, those dependencies will only be included in the final executable once.

Therefore, the total size of a Go executable will not be the sum of the individual library sizes. You can use profiling tools, such as go tool pprof, to analyze the size of your executable in more detail and identify the specific packages and functions that are consuming the most space.

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