Preallocate memory to reduce GC load (#32905)

Preallocating memory reduces the load Go needs to handle and track allocated memory regions. This also reduces GC load. Signed-off-by: Florian Lehner <florian.lehner@elastic.co>
elastic · Aug 30, 2022 · 3668fd6 · 3668fd6
1 parent 2400e9a
commit 3668fd6
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diff --git a/libbeat/template/load_integration_test.go b/libbeat/template/load_integration_test.go
@@ -370,7 +370,7 @@ func TestESLoader_Load(t *testing.T) {
  require.NoError(t, err)
  p, ok := val.(map[string]interface{})
  require.True(t, ok)
- var properties []string
+ properties := make([]string, 0, len(p))
  for k := range p {
  properties = append(properties, k)
  }

diff --git a/x-pack/filebeat/input/httpjson/transform_registry.go b/x-pack/filebeat/input/httpjson/transform_registry.go
@@ -52,7 +52,7 @@ func (reg registry) String() string {
 
  var str string
  for namespace, m := range reg.namespaces {
- var names []string
+ names := make([]string, 0, len(m))
  for k := range m {
  names = append(names, k)
  }