inline

bench_array.lua

@@ -0,0 +1,93 @@
+-- bench_array.lua — array operation benchmark (Lua)
+
+local size = 100000
+local clock = os.clock
+
+local function bench_push()
+  local a = {}
+  for i = 0, size - 1 do
+    a[#a + 1] = i
+  end
+  return #a
+end
+
+local function bench_index_write()
+  local a = {}
+  for i = 1, size do a[i] = 0 end
+  for i = 1, size do
+    a[i] = i - 1
+  end
+  return a[size]
+end
+
+local function bench_seq_read()
+  local a = {}
+  for i = 1, size do
+    a[i] = i - 1
+  end
+  local s = 0
+  for i = 1, size do
+    s = s + a[i]
+  end
+  return s
+end
+
+local function bench_reverse()
+  local a = {}
+  for i = 1, size do
+    a[i] = i - 1
+  end
+  local lo, hi = 1, size
+  while lo < hi do
+    a[lo], a[hi] = a[hi], a[lo]
+    lo = lo + 1
+    hi = hi - 1
+  end
+  return a[1]
+end
+
+local function bench_matrix()
+  local n = 300
+  local mat = {}
+  for i = 1, n do
+    mat[i] = {}
+    for j = 1, n do
+      mat[i][j] = (i - 1) * n + (j - 1)
+    end
+  end
+  local s = 0
+  for i = 1, n do
+    s = s + mat[i][i]
+  end
+  return s
+end
+
+local function bench_filter_count()
+  local a = {}
+  for i = 1, size do
+    a[i] = i - 1
+  end
+  local count = 0
+  for i = 1, size do
+    if a[i] % 2 == 0 then
+      count = count + 1
+    end
+  end
+  return count
+end
+
+local function run(name, fn)
+  local start = clock()
+  local result = fn()
+  local elapsed = (clock() - start) * 1000
+  print(string.format("  %s: %.2f ms  (result: %s)", name, elapsed, tostring(result)))
+end
+
+print("=== Array Benchmark ===")
+print(string.format("  size: %d", size))
+run("push         ", bench_push)
+run("index_write  ", bench_index_write)
+run("seq_read_sum ", bench_seq_read)
+run("reverse      ", bench_reverse)
+run("matrix_300   ", bench_matrix)
+run("filter_count ", bench_filter_count)