a Bazel memory regression

BUG.txt

The regression can be demonstrated with the workspace in this Gist and Bazel 0.11.1 and Bazel 0.13:

$ ../bazel-0.11.1/output/bazel build --nobuild //:my-target
$ ../bazel-0.11.1/output/bazel info used-heap-size-after-gc
37MB
$ ../bazel-0.13.0/output/bazel build --nobuild //:my-target
$ ../bazel-0.13.0/output/bazel info used-heap-size-after-gc
42MB

BUILD

load(':lots_of_runfiles.bzl', 'lots_of_runfiles')

lots_of_runfiles(name = 'my-target')

lots_of_runfiles.bzl

def _lots_of_runfiles(ctx):
    empty = ctx.actions.declare_file('dummy')
    ctx.actions.write(content='', output=empty)
    template = 'ponderously/long/filesystem/path/which/becomes/one/symlink/in/the/runfiles/tree/%s'
    symlinks = {
        template % (i,): empty
        for i in range(100000)
    }
    return [DefaultInfo(runfiles=ctx.runfiles(symlinks=symlinks))]

lots_of_runfiles = rule(implementation=_lots_of_runfiles)

WORKSPACE

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