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Diffstat (limited to 'dependencies')
| -rw-r--r-- | dependencies/analyses/README.md | 88 | ||||
| -rwxr-xr-x | dependencies/analyses/dependency-tree.sh | 17 | ||||
| -rwxr-xr-x | dependencies/analyses/go-archive-analysis.sh | 12 | ||||
| -rwxr-xr-x | dependencies/analyses/nm-symbols-analysis.sh | 9 |
4 files changed, 126 insertions, 0 deletions
diff --git a/dependencies/analyses/README.md b/dependencies/analyses/README.md new file mode 100644 index 000000000..a440a0ebd --- /dev/null +++ b/dependencies/analyses/README.md @@ -0,0 +1,88 @@ +# A set of scripts and instructions that help to analyze and debloat go-lang dependencies + +Note that all scripts mentioned below follow the [KISS principle](https://en.wikipedia.org/wiki/KISS_principle) on purpose. +The scripts are meant to be used in combination to aid in understanding the packages' dependencies and how they contribute to the size of the compiled binary. + +## Size of packages + +To analyze the size of all go packages used during the build process, pass the `-work -a` build flags to `go build`. +The `-a` flag forces go to rebuild all packages even if they are already up-to-date (e.g., in the build cache), while the `-work` flag instructs go to print the temporary work directory used for compiling the packages. +The path to the temporary work directory of `go-build` must be passed to `go-archive-analysis.sh` by setting it as an environment variable. +The analysis script will then read and parse the build data and print a sorted table of the package size in bytes followed by the package name. + +Running such an analysis on libpod may look as follows: + +``` +# 1) Build the podman binary with `-work -a`. +[libpod]$ BUILDFLAGS="-work -a" make podman +[...] +WORK=/tmp/go-build794287815 + +# 2) Set the work directory as an environment variable and call the analysis script +[libpod]$ WORK=/tmp/go-build794287815 ./dependencies/analyses/go-archive-analysis.sh | head -n10 +17M github.com/containers/libpod/cmd/podman/cliconfig +13M github.com/containers/libpod/vendor/github.com/DataDog/zstd +10M github.com/containers/libpod/vendor/k8s.io/api/core/v1 +3.7M net/http +3.7M github.com/containers/libpod/libpod +3.2M runtime +2.7M github.com/containers/libpod/vendor/github.com/gogo/protobuf/proto +2.5M github.com/containers/libpod/vendor/k8s.io/apimachinery/pkg/apis/meta/v1 +2.3M github.com/containers/libpod/vendor/github.com/vishvananda/netlink +2.1M github.com/containers/libpod/cmd/podman/varlink +``` + +The output of the `go-archive-analysis.sh` script is a sorted table with the size in bytes followed by the package. +The size denotes the size of the compiled package (i.e., the `.a` file). + + +## Size of symbols in binary + +Once the binary is compiled, we can run another set of analyses on it. +The `nm-symbols-analysis.sh` is a wrapper around `go tool nm` and prints a table with the size in bytes followed by the symbol's name. +To avoid information overload, the scripts prints only symbols from the text/code segment. + +Running such an analysis on libpod may look as follows: + +``` +# 1) Compile the binary +[libpod]$ make podman +[...] + +# 2) Run the script with the binary as an argument +[libpod]$ ./dependencies/analyses/nm-symbols-analysis.sh ./bin/podman | grep "containers/libpod/libpod" | head -n10 +299 github.com/containers/libpod/libpod.(*BoltState).AddContainer +658 github.com/containers/libpod/libpod.(*BoltState).AddContainerToPod +2120 github.com/containers/libpod/libpod.(*BoltState).AddPod +3773 github.com/containers/libpod/libpod.(*BoltState).AddPod.func1 +965 github.com/containers/libpod/libpod.(*BoltState).AddVolume +1651 github.com/containers/libpod/libpod.(*BoltState).AddVolume.func1 +558 github.com/containers/libpod/libpod.(*BoltState).AllContainers +282 github.com/containers/libpod/libpod.(*BoltState).AllContainers.func1 +1121 github.com/containers/libpod/libpod.(*BoltState).AllContainers.func1.1 +558 github.com/containers/libpod/libpod.(*BoltState).AllPods +``` + +Running the script can help identify sources of bloat and reveal potential candidates (e.g., entire packages, types, or function) for refactoring. + + +## Dependency Tree + +Use the `dependency-tree.sh` script to figure out which package includes which packages. +The output of the script has the format `package: dependency_1, dependency_2, ...`. +Each line is followed by a blank line to make it easier to read. +The script generates two files: + + - `direct-tree.txt` - listing direct dependencies + - `transitive-tree.txt` - listing direct and transitive dependencies + +Running such a dependency-tree analysis may look as follows: + + +``` +[libpod]$ ./dependencies/analyses/dependency-tree.sh github.com/containers/libpod +[libpod]$ grep "^github.com/containers/libpod/pkg/registries" direct-tree.txt +github.com/containers/libpod/pkg/registries: github.com/containers/libpod/vendor/github.com/containers/image/pkg/sysregistriesv2, github.com/containers/libpod/vendor/github.com/containers/image/types, github.com/containers/libpod/pkg/rootless, github.com/containers/libpod/vendor/github.com/docker/distribution/reference, github.com/containers/libpod/vendor/github.com/pkg/errors, os, path/filepath, strings +``` + +As shown above, the script's output can then be used to query for specific packages (e.g, with `grep`). diff --git a/dependencies/analyses/dependency-tree.sh b/dependencies/analyses/dependency-tree.sh new file mode 100755 index 000000000..84085a50d --- /dev/null +++ b/dependencies/analyses/dependency-tree.sh @@ -0,0 +1,17 @@ +#!/usr/bin/bash + +if test "$#" -ne 1; then + echo "invalid arguments: usage: $0 path to package" + exit 1 +fi + +go list $1/... \ + | xargs -d '\n' go list -f '{{ .ImportPath }}: {{ join .Imports ", " }}' \ + | awk '{ printf "%s\n\n", $0 }' \ + > direct-tree.tmp.$$ && mv -f direct-tree.tmp.$$ direct-tree.txt + + +go list $1/... \ + | xargs -d '\n' go list -f '{{ .ImportPath }}: {{ join .Deps ", " }}' \ + | awk '{ printf "%s\n\n", $0 }' \ + > transitive-tree.tmp.$$ && mv -f transitive-tree.tmp.$$ transitive-tree.txt diff --git a/dependencies/analyses/go-archive-analysis.sh b/dependencies/analyses/go-archive-analysis.sh new file mode 100755 index 000000000..f10145dad --- /dev/null +++ b/dependencies/analyses/go-archive-analysis.sh @@ -0,0 +1,12 @@ +#!/usr/bin/bash + +if [ -z "$WORK" ] +then + echo "WORK environment variable must be set" + exit 1 +fi + +grep --no-filename packagefile $WORK/**/importcfg \ + | awk '{ split($2, data, "="); printf "%s ", data[1]; system("du -sh " data[2]) }' \ + | awk '{ printf "%s %s\n", $2, $1 }' \ + | sort -u | sort -rh diff --git a/dependencies/analyses/nm-symbols-analysis.sh b/dependencies/analyses/nm-symbols-analysis.sh new file mode 100755 index 000000000..361b746e4 --- /dev/null +++ b/dependencies/analyses/nm-symbols-analysis.sh @@ -0,0 +1,9 @@ +#!/usr/bin/bash + +if test "$#" -ne 1; then + echo "invalid arguments: usage: $0 path/to/binary" + exit 1 +fi + +go tool nm -size "$1" \ + | awk 'NF==4 && $3=="t" {printf "%s\t\t%s\n", $2, $4}' |