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local helpers = require('test.functional.helpers')(after_each)
local clear = helpers.clear
local eval = helpers.eval
local eq = helpers.eq
local feed_command = helpers.feed_command
local iswin = helpers.iswin
local retry = helpers.retry
local ok = helpers.ok
local source = helpers.source
local wait = helpers.wait
local uname = helpers.uname
local load_adjust = helpers.load_adjust
local monitor_memory_usage = {
memory_usage = function(self)
local handle
if iswin() then
handle = io.popen('wmic process where processid=' ..self.pid..' get WorkingSetSize')
else
handle = io.popen('ps -o rss= -p '..self.pid)
end
return tonumber(handle:read('*a'):match('%d+'))
end,
op = function(self)
retry(nil, 10000, function()
local val = self.memory_usage(self)
if self.max < val then
self.max = val
end
table.insert(self.hist, val)
ok(#self.hist > 20)
local result = {}
for key,value in ipairs(self.hist) do
if value ~= self.hist[key + 1] then
table.insert(result, value)
end
end
table.remove(self.hist, 1)
self.last = self.hist[#self.hist]
eq(#result, 1)
end)
end,
dump = function(self)
return 'max: '..self.max ..', last: '..self.last
end,
monitor_memory_usage = function(self, pid)
local obj = {
pid = pid,
max = 0,
last = 0,
hist = {},
}
setmetatable(obj, { __index = self })
obj:op()
return obj
end
}
setmetatable(monitor_memory_usage,
{__call = function(self, pid)
return monitor_memory_usage.monitor_memory_usage(self, pid)
end})
describe('memory usage', function()
local function check_result(tbl, status, result)
if not status then
print('')
for key, val in pairs(tbl) do
print(key, val:dump())
end
error(result)
end
end
local function isasan()
local version = eval('execute("version")')
return version:match('-fsanitize=[a-z,]*address')
end
before_each(clear)
--[[
Case: if a local variable captures a:000, funccall object will be free
just after it finishes.
]]--
it('function capture vargs', function()
if isasan() then
pending('ASAN build is difficult to estimate memory usage')
end
if iswin() and eval("executable('wmic')") == 0 then
pending('missing "wmic" command')
elseif eval("executable('ps')") == 0 then
pending('missing "ps" command')
end
local pid = eval('getpid()')
local before = monitor_memory_usage(pid)
source([[
func s:f(...)
let x = a:000
endfunc
for _ in range(10000)
call s:f(0)
endfor
]])
wait()
local after = monitor_memory_usage(pid)
-- Estimate the limit of max usage as 2x initial usage.
-- The lower limit can fluctuate a bit, use 97%.
check_result({before=before, after=after},
pcall(ok, before.last * 97 / 100 < after.max))
check_result({before=before, after=after},
pcall(ok, before.last * 2 > after.max))
-- In this case, garbage collecting is not needed.
-- The value might fluctuate a bit, allow for 3% tolerance below and 5% above.
-- Based on various test runs.
local lower = after.last * 97 / 100
local upper = after.last * 105 / 100
check_result({before=before, after=after}, pcall(ok, lower < after.max))
check_result({before=before, after=after}, pcall(ok, after.max < upper))
end)
--[[
Case: if a local variable captures l: dict, funccall object will not be
free until garbage collector runs, but after that memory usage doesn't
increase so much even when rerun Xtest.vim since system memory caches.
]]--
it('function capture lvars', function()
if isasan() then
pending('ASAN build is difficult to estimate memory usage')
end
if iswin() and eval("executable('wmic')") == 0 then
pending('missing "wmic" command')
elseif eval("executable('ps')") == 0 then
pending('missing "ps" command')
end
local pid = eval('getpid()')
local before = monitor_memory_usage(pid)
local fname = source([[
if !exists('s:defined_func')
func s:f()
let x = l:
endfunc
endif
let s:defined_func = 1
for _ in range(10000)
call s:f()
endfor
]])
wait()
local after = monitor_memory_usage(pid)
for _ = 1, 3 do
feed_command('so '..fname)
wait()
end
local last = monitor_memory_usage(pid)
-- The usage may be a bit less than the last value, use 80%.
-- Allow for 20% tolerance at the upper limit. That's very permissive, but
-- otherwise the test fails sometimes. On Sourcehut CI with FreeBSD we need to
-- be even more permissive.
local upper_multiplier = uname() == 'freebsd' and 15 or 12
local lower = before.last * 8 / 10
local upper = load_adjust((after.max + (after.last - before.last)) * upper_multiplier / 10)
check_result({before=before, after=after, last=last},
pcall(ok, lower < last.last))
check_result({before=before, after=after, last=last},
pcall(ok, last.last < upper))
end)
end)
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