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FAQ

Managing Binary Size

This package adds about 900K to any binary that depends on it.

Prior to 2019-05-16, this package could add about 2MB to the size of your binaries. We have now trimmed that by 60%, and the package contributes less than 1MB. This compares favorably to other packages like json-iterator/go (1MB).

Of that 900Kb, about 200Kb is from an optional auto-generated file: fast-path.generated.go that includes static generated implementations providing much faster encoding and decoding of slices and maps containing built-in numeric, boolean, string and interface{} types.

Furthermore, you can bypass including fast-path.generated.go in your binary, by building (or running tests and benchmarks) with the tag: codec.notfastpath.

go install -tags codec.notfastpath
go build -tags codec.notfastpath
go test -tags codec.notfastpath

With the tag codec.notfastpath, we trim that size to about 700Kb.

Please be aware of the following:

  • At least in our representative microbenchmarks for json (for example), passing codec.notfastpath tag causes a clear performance loss (about 10%).
    YMMV.
  • These values were got from building the test binary that gives > 90% code coverage, and running go tool nm on it to see how much space these library symbols took. We consider that your use will touch much less of the library and you can be sure that it will add less than 1MB to your binary.

Resolving Module Issues

Prior to v1.1.5, go-codec unknowingly introduced some headaches for its users while introducing module support. We tried to make github.com/ugorji/go/codec a module. At that time, multi-repository module support was weak, so we reverted and made github.com/ugorji/go/ the module.

However, folks previously used go-codec in module mode before it formally supported modules. Eventually, different established packages had go.mod files contain various real and pseudo versions of go-codec which causes go to barf with ambiguous import error.

To resolve this, from v1.1.5 and up, we use a requirements cycle between modules github.com/ugorji/go/codec and github.com/ugorji/go/, tagging them with parallel consistent tags (codec/vX.Y.Z and vX.Y.Z) to the same commit.

Fixing ambiguous import failure is now as simple as running

go get -u github.com/ugorji/go/codec@latest

Running on GCCGO

You can use gccgo 1 to build your applications that depend on this library. This is fully tested.

There's a caveat for contributors to the library. If you are contributing to the library, you will need to run ./build.sh -m at some point. This has a failure on gccgo. Consequently, contributors must use the gc compiler.