Luajit性能

硬件规格：ecs.t5-lc1m1.small
CPU: Intel(R) Xeon(R) Platinum 8163 CPU @ 2.50GHz

一、预先生成数组

耗时由1.5秒提升到0.9秒

实验组

resty -e '
local begin = ngx.now()
local t = {}
for i=1,10000000 do
  table.insert(t, i)
end
ngx.update_time()
print(ngx.now() - begin)
'

用时：1.5160000324249

对照组

resty -e '
local new_table = require("table.new")
local begin = ngx.now()
local t = new_table(10000000, 0)
for i=1,10000000 do
  table.insert(t, i)
end
ngx.update_time()
print(ngx.now() - begin)
'

用时：0.94700002670288

二、自己计算table下标

耗时由0.93秒提升到0.03秒

实验组

resty -e '
local new_table = require("table.new")
local begin = ngx.now()
local t = new_table(10000000, 0)
for i=1,10000000 do
  table.insert(t, i)
end
ngx.update_time()
print(ngx.now() - begin)
'

用时：0.93299984931946

对照组

resty -e '
local new_table = require("table.new")
local begin = ngx.now()
local t = new_table(10000000, 0)
for i=1,1000000 do
  t[i] = i
end
ngx.update_time()
print(ngx.now() - begin)
'

用时：0.032000064849854

三、循环使用table

耗时由0.06秒提升到0.035秒

实验组

resty -e '
local new_table = require("table.new")
local begin = ngx.now()
local t1 = new_table(10000000, 0)
for i=1,1000000 do
  t1[i] = i
end
local t2 = new_table(10000000, 0)
for i=1,1000000 do
  t2[i] = i
end
ngx.update_time()
print(ngx.now() - begin)
'

用时：0.06600022315979

实验组

resty -e '
local new_table = require("table.new")
local begin = ngx.now()
local t = new_table(10000000, 0)
for i=1,1000000 do
  t[i] = i
end
for i=1,1000000 do
  t[i] = i
end
ngx.update_time()
print(ngx.now() - begin)
'

用时：0.035000085830688

四、使用jit优化函数

耗时由0.9秒提升到0.75秒

实验组

resty -e '
local new_table = require("table.new")
local t = new_table(1000000, 0)
for i=1,1000000 do
  t[tostring(i)] = i
end
local begin = ngx.now()
for k,v in pairs(t) do
  t[k] = "ok"
end
ngx.update_time()
print(ngx.now() - begin)
'

用时：0.90300011634827

对照组

resty -e '
local new_table = require("table.new")
local t = new_table(1000000, 0)
for i=1,1000000 do
  t[tostring(i)] = i
end
local begin = ngx.now()
for i,v in ipairs(t) do
  t[i] = 1
end
ngx.update_time()
print(ngx.now() - begin)
'

用时：0.75699996948242