Hi, Sergey!

thanks for the patch!

This patch adjusts the aforementioned test to use the benchmark
framework introduced before. The default arguments are adjusted
according to the <PARAM_x86.txt> file. The arguments to the script still
can be provided in the command line run.

The number of iterations is fixed for this test to avoid OOM errors
for the non-GC64 builds.
---
 perf/LuaJIT-benches/array3d.lua | 25 ++++++++++++++++++++-----
 1 file changed, 20 insertions(+), 5 deletions(-)

diff --git a/perf/LuaJIT-benches/array3d.lua b/perf/LuaJIT-benches/array3d.lua
index c10b09b1..75ab5b01 100644
--- a/perf/LuaJIT-benches/array3d.lua
+++ b/perf/LuaJIT-benches/array3d.lua
@@ -1,3 +1,4 @@
+local bench = require("bench").new(arg)
 
 local function array_set(self, x, y, z, p)
   assert(x >= 0 and x < self.nx, "x outside PA")
@@ -50,10 +51,24 @@ end
 
 local dim = tonumber(arg and arg[1]) or 300 -- Array dimension dim^3
 local packed = arg and arg[2] == "packed"   -- Packed image or flat
-local arr = array_new(dim, dim, dim, packed)
 
-for x,y,z in arr:points() do
-  arr:set(x, y, z, x*x)
-end
-assert(arr.image[dim^3-1] == (dim-1)^2)
+bench:add({
+  name = "array3d",
+  checker = function(arr)
+    assert(arr.image[dim^3-1] == (dim-1)^2)
+    return true
+  end,
+  payload = function()
+    local arr = array_new(dim, dim, dim, packed)
+    for x,y,z in arr:points() do

+      arr:set(x, y, z, x*x)
+    end
+    return arr
+  end,
+  items = dim * dim * dim,
+  -- Limit the number of iterations to avoid OOM errors for
+  -- non-GC64 builds.
+  iterations = 5,
+})
 
+bench:run_and_report()

Looks like benchmark min time does not work as expected:

[1] ~/sources/MRG/tarantool/third_party/luajit $ time ./build/src/luajit perf/LuaJIT-benches/array3d.lua --benchmark_min_time=10 
-------------------------------------------------------------------------------------------------------------
Benchmark                                     Time             CPU    Iterations UserCounters...             
-------------------------------------------------------------------------------------------------------------
array3d                                     2.10 s          2.13 s             5 items_per_second=64.370M/s

real    0m2.333s
user    0m1.869s
sys     0m0.461s
[1] ~/sources/MRG/tarantool/third_party/luajit $ 

--benchmark_min_time set to 10 sec, but benchmark.lua reports "2.10 s" and time reported by `time` utility

is less than 10 sec.