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" Tests for memory usage.
source check.vim
CheckFeature terminal
CheckNotGui
if execute('version') =~# '-fsanitize=[a-z,]*\<address\>'
" Skip tests on Travis CI ASAN build because it's difficult to estimate
" memory usage.
throw 'Skipped: does not work with ASAN'
endif
source shared.vim
func s:pick_nr(str) abort
return substitute(a:str, '[^0-9]', '', 'g') * 1
endfunc
if has('win32')
if !executable('wmic')
throw 'Skipped: wmic program missing'
endif
func s:memory_usage(pid) abort
let cmd = printf('wmic process where processid=%d get WorkingSetSize', a:pid)
return s:pick_nr(system(cmd)) / 1024
endfunc
elseif has('unix')
if !executable('ps')
throw 'Skipped: ps program missing'
endif
func s:memory_usage(pid) abort
return s:pick_nr(system('ps -o rss= -p ' . a:pid))
endfunc
else
throw 'Skipped: not win32 or unix'
endif
" Wait for memory usage to level off.
func s:monitor_memory_usage(pid) abort
let proc = {}
let proc.pid = a:pid
let proc.hist = []
let proc.max = 0
func proc.op() abort
" Check the last 200ms.
let val = s:memory_usage(self.pid)
if self.max < val
let self.max = val
endif
call add(self.hist, val)
if len(self.hist) < 20
return 0
endif
let sample = remove(self.hist, 0)
return len(uniq([sample] + self.hist)) == 1
endfunc
call WaitFor({-> proc.op()}, 10000)
return {'last': get(proc.hist, -1), 'max': proc.max}
endfunc
let s:term_vim = {}
func s:term_vim.start(...) abort
let self.buf = term_start([GetVimProg()] + a:000)
let self.job = term_getjob(self.buf)
call WaitFor({-> job_status(self.job) ==# 'run'})
let self.pid = job_info(self.job).process
endfunc
func s:term_vim.stop() abort
call term_sendkeys(self.buf, ":qall!\<CR>")
call WaitFor({-> job_status(self.job) ==# 'dead'})
exe self.buf . 'bwipe!'
endfunc
func s:vim_new() abort
return copy(s:term_vim)
endfunc
func Test_memory_func_capture_vargs()
" Case: if a local variable captures a:000, funccall object will be free
" just after it finishes.
let testfile = 'Xtest.vim'
let lines =<< trim END
func s:f(...)
let x = a:000
endfunc
for _ in range(10000)
call s:f(0)
endfor
END
call writefile(lines, testfile)
let vim = s:vim_new()
call vim.start('--clean', '-c', 'set noswapfile', testfile)
let before = s:monitor_memory_usage(vim.pid).last
call term_sendkeys(vim.buf, ":so %\<CR>")
call WaitFor({-> term_getcursor(vim.buf)[0] == 1})
let after = s:monitor_memory_usage(vim.pid)
" Estimate the limit of max usage as 2x initial usage.
" The lower limit can fluctuate a bit, use 97%.
call assert_inrange(before * 97 / 100, 2 * before, 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.
let lower = after.last * 97 / 100
let upper = after.last * 105 / 100
call assert_inrange(lower, upper, after.max)
call vim.stop()
call delete(testfile)
endfunc
func Test_memory_func_capture_lvars()
" 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.
let testfile = 'Xtest.vim'
let lines =<< trim END
func s:f()
let x = l:
endfunc
for _ in range(10000)
call s:f()
endfor
END
call writefile(lines, testfile)
let vim = s:vim_new()
call vim.start('--clean', '-c', 'set noswapfile', testfile)
let before = s:monitor_memory_usage(vim.pid).last
call term_sendkeys(vim.buf, ":so %\<CR>")
call WaitFor({-> term_getcursor(vim.buf)[0] == 1})
let after = s:monitor_memory_usage(vim.pid)
" Rerun Xtest.vim.
for _ in range(3)
call term_sendkeys(vim.buf, ":so %\<CR>")
call WaitFor({-> term_getcursor(vim.buf)[0] == 1})
let last = s:monitor_memory_usage(vim.pid).last
endfor
" 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.
let lower = before * 8 / 10
let upper = (after.max + (after.last - before)) * 12 / 10
call assert_inrange(lower, upper, last)
call vim.stop()
call delete(testfile)
endfunc
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