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local lanes = require "lanes"
lanes.configure{ with_timers = false}
-- Lua 5.1/5.2 compatibility
local table_unpack = unpack or table.unpack
-- this lane eats items in the linda one by one
local eater = function( l, loop)
-- wait for start signal
l:receive( "go")
-- eat data one by one
for i = 1, loop do
local val, key = l:receive( "key")
--print( val)
end
-- print "loop is over"
key, val = l:receive( "done")
-- print( val)
end
-- this lane eats items in the linda in batches
local batched = function( l, loop, batch)
-- wait for start signal
l:receive( "go")
-- eat data in batches
for i = 1, loop/batch do
l:receive( l.batched, "key", batch)
end
print "loop is over"
key, val = l:receive( "done")
print( val)
end
local lane_eater_gen = lanes.gen( "*", {priority = 3}, eater)
local lane_batched_gen = lanes.gen( "*", {priority = 3}, batched)
-- main thread writes data while a lane reads it
local function ziva( preloop, loop, batch)
-- prefill the linda a bit to increase fifo stress
local top = math.max( preloop, loop)
local l, lane = lanes.linda()
local t1 = lanes.now_secs()
for i = 1, preloop do
l:send( "key", i)
end
print( "stored " .. l:count( "key") .. " items in the linda before starting consumer lane")
if batch > 0 then
if l.batched then
lane = lane_batched_gen( l, top, batch)
else
print "no batch support in this version of Lanes"
lane = lane_eater_gen( l, top)
end
else
lane = lane_eater_gen( l, top)
end
-- tell the consumer lane it can start eating data
l:send( "go", true)
-- send the remainder of the elements while they are consumed
-- create a function that can send several values in one shot
batch = math.max( batch, 1)
local batch_values = {}
for i = 1, batch do
table.insert( batch_values, i)
end
local batch_send = function()
l:send( "key", table_unpack( batch_values))
end
if loop > preloop then
for i = preloop + 1, loop, batch do
batch_send()
end
end
l:send( "done" ,"are you happy?")
lane:join()
return lanes.now_secs() - t1
end
local tests1 =
{
{ 10000, 2000000, 0},
{ 10000, 2000000, 1},
{ 10000, 2000000, 2},
{ 10000, 2000000, 3},
{ 10000, 2000000, 5},
{ 10000, 2000000, 8},
{ 10000, 2000000, 13},
{ 10000, 2000000, 21},
{ 10000, 2000000, 44},
}
print "############################################\ntests #1"
for k, v in pairs( tests1) do
local pre, loop, batch = v[1], v[2], v[3]
print( "testing", pre, loop, batch)
print( pre, loop, batch, "duration = " .. ziva( pre, loop, batch) .. "\n")
end
--[[
V 2.1.0:
ziva( 20000, 0) -> 4s ziva( 10000, 20000) -> 3s
ziva( 30000, 0) -> 8s ziva( 20000, 30000) -> 7s
ziva( 40000, 0) -> 15s ziva( 30000, 40000) -> 15s
ziva( 50000, 0) -> 24s ziva( 40000, 50000) -> 23s
ziva( 60000, 0) -> 34s ziva( 50000, 60000) -> 33s
SIMPLIFIED:
ziva( 20000, 0) -> 4s ziva( 10000, 20000) -> 3s
ziva( 30000, 0) -> 9s ziva( 20000, 30000) -> 8s
ziva( 40000, 0) -> 15s ziva( 30000, 40000) -> 15s
ziva( 50000, 0) -> 25s ziva( 40000, 50000) -> 24s
ziva( 60000, 0) -> 35s ziva( 50000, 60000) -> 35s
FIFO:
ziva( 2000000, 0) -> 9s ziva( 1000000, 2000000) -> 33s
ziva( 3000000, 0) -> 14s ziva( 2000000, 3000000) -> 40s
ziva( 4000000, 0) -> 20s ziva( 3000000, 4000000) -> 27s
ziva( 5000000, 0) -> 24s ziva( 4000000, 5000000) -> 42s
ziva( 6000000, 0) -> 29s ziva( 5000000, 6000000) -> 55s
FIFO BATCHED:
ziva( 4000000, 0, 1) -> 20s
ziva( 4000000, 0, 2) -> 11s
ziva( 4000000, 0, 3) -> 7s
ziva( 4000000, 0, 5) -> 5s
ziva( 4000000, 0, 8) -> 3s
ziva( 4000000, 0, 13) -> 3s
ziva( 4000000, 0, 21) -> 3s
ziva( 4000000, 0, 44) -> 2s
]]
-- sequential write/read (no parallelization involved)
local function ziva2( preloop, loop, batch)
local l = lanes.linda()
-- prefill the linda a bit to increase fifo stress
local top, step = math.max( preloop, loop), (l.batched and batch) and batch or 1
local batch_send, batch_read
if l.batched and batch then
local batch_values = {}
for i = 1, batch do
table.insert( batch_values, i)
end
-- create a function that can send several values in one shot
batch_send = function()
l:send( "key", table_unpack( batch_values))
end
batch_read = function()
l:receive( l.batched, "key", batch)
end
else -- not batched
batch_send = function()
l:send( "key", top)
end
batch_read = function()
l:receive( "key")
end
end
local t1 = lanes.now_secs()
-- first, prime the linda with some data
for i = 1, preloop, step do
batch_send()
end
print( "stored " .. (l:count( "key") or 0) .. " items in the linda before starting consumer lane")
-- loop that alternatively sends and reads data off the linda
if loop > preloop then
for i = preloop + 1, loop, step do
batch_send()
batch_read()
end
end
-- here, we have preloop elements still waiting inside the linda
for i = 1, preloop, step do
batch_read()
end
return lanes.now_secs() - t1
end
local tests2 =
{
-- prefill, then consume everything
--[[
{ 4000000, 0},
{ 4000000, 0, 1},
{ 4000000, 0, 2},
{ 4000000, 0, 3},
{ 4000000, 0, 5},
{ 4000000, 0, 8},
{ 4000000, 0, 13},
{ 4000000, 0, 21},
{ 4000000, 0, 44},
--]]
-- alternatively fill and consume
{ 0, 4000000},
{ 0, 4000000, 1},
{ 0, 4000000, 2},
{ 0, 4000000, 3},
{ 0, 4000000, 5},
{ 0, 4000000, 8},
{ 0, 4000000, 13},
{ 0, 4000000, 21},
{ 0, 4000000, 44},
}
print "\n############################################\ntests #2"
for k, v in pairs( tests2) do
local pre, loop, batch = v[1], v[2], v[3]
print( "testing", pre, loop, batch)
print( pre, loop, batch, "duration = " .. ziva2( pre, loop, batch) .. "\n")
end
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