1 files changed, 58 insertions, 0 deletions
diff --git a/test/benchmark/deepcopy_spec.lua b/test/benchmark/deepcopy_spec.lua
new file mode 100644
index 0000000000..dc8655f19c
--- /dev/null
+++ b/test/benchmark/deepcopy_spec.lua
@@ -0,0 +1,58 @@
+local N = 20
+
+local function tcall(f, ...)
+  local ts = vim.uv.hrtime()
+  for _ = 1, N do
+    f(...)
+  end
+  return ((vim.uv.hrtime() - ts) / 1000000) / N
+end
+
+local function build_shared(n)
+  local t = {}
+  local a = {}
+  local b = {}
+  local c = {}
+  for _ = 1, n do
+    t[#t + 1] = {}
+    local tl = t[#t]
+    for _ = 1, n do
+      tl[#tl + 1] = a
+      tl[#tl + 1] = b
+      tl[#tl + 1] = c
+    end
+  end
+  return t
+end
+
+local function build_unique(n)
+  local t = {}
+  for _ = 1, n do
+    t[#t + 1] = {}
+    local tl = t[#t]
+    for _ = 1, n do
+      tl[#tl + 1] = {}
+    end
+  end
+  return t
+end
+
+describe('vim.deepcopy()', function()
+  local function run(name, n, noref)
+    it(string.format('%s entries=%d noref=%s', name, n, noref), function()
+      local t = name == 'shared' and build_shared(n) or build_unique(n)
+      local d = tcall(vim.deepcopy, t, noref)
+      print(string.format('%.2f ms', d))
+    end)
+  end
+
+  run('unique', 50, false)
+  run('unique', 50, true)
+  run('unique', 2000, false)
+  run('unique', 2000, true)
+
+  run('shared', 50, false)
+  run('shared', 50, true)
+  run('shared', 2000, false)
+  run('shared', 2000, true)
+end)