mirror of
https://github.com/thegeeklab/ansible-later.git
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227 lines
11 KiB
Python
227 lines
11 KiB
Python
from __future__ import print_function
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from .lib import TestBase, FileCreator
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from smmap.mman import (
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WindowCursor,
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SlidingWindowMapManager,
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StaticWindowMapManager
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)
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from smmap.util import align_to_mmap
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from random import randint
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from time import time
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import os
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import sys
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from copy import copy
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class TestMMan(TestBase):
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def test_cursor(self):
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with FileCreator(self.k_window_test_size, "cursor_test") as fc:
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man = SlidingWindowMapManager()
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ci = WindowCursor(man) # invalid cursor
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assert not ci.is_valid()
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assert not ci.is_associated()
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assert ci.size() == 0 # this is cached, so we can query it in invalid state
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cv = man.make_cursor(fc.path)
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assert not cv.is_valid() # no region mapped yet
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assert cv.is_associated() # but it know where to map it from
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assert cv.file_size() == fc.size
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assert cv.path() == fc.path
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# copy module
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cio = copy(cv)
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assert not cio.is_valid() and cio.is_associated()
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# assign method
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assert not ci.is_associated()
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ci.assign(cv)
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assert not ci.is_valid() and ci.is_associated()
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# unuse non-existing region is fine
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cv.unuse_region()
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cv.unuse_region()
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# destruction is fine (even multiple times)
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cv._destroy()
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WindowCursor(man)._destroy()
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def test_memory_manager(self):
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slide_man = SlidingWindowMapManager()
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static_man = StaticWindowMapManager()
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for man in (static_man, slide_man):
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assert man.num_file_handles() == 0
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assert man.num_open_files() == 0
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winsize_cmp_val = 0
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if isinstance(man, StaticWindowMapManager):
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winsize_cmp_val = -1
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# END handle window size
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assert man.window_size() > winsize_cmp_val
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assert man.mapped_memory_size() == 0
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assert man.max_mapped_memory_size() > 0
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# collection doesn't raise in 'any' mode
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man._collect_lru_region(0)
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# doesn't raise if we are within the limit
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man._collect_lru_region(10)
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# doesn't fail if we over-allocate
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assert man._collect_lru_region(sys.maxsize) == 0
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# use a region, verify most basic functionality
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with FileCreator(self.k_window_test_size, "manager_test") as fc:
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fd = os.open(fc.path, os.O_RDONLY)
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try:
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for item in (fc.path, fd):
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c = man.make_cursor(item)
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assert c.path_or_fd() is item
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assert c.use_region(10, 10).is_valid()
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assert c.ofs_begin() == 10
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assert c.size() == 10
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with open(fc.path, 'rb') as fp:
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assert c.buffer()[:] == fp.read(20)[10:]
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if isinstance(item, int):
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self.assertRaises(ValueError, c.path)
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else:
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self.assertRaises(ValueError, c.fd)
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# END handle value error
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# END for each input
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finally:
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os.close(fd)
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# END for each manasger type
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def test_memman_operation(self):
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# test more access, force it to actually unmap regions
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with FileCreator(self.k_window_test_size, "manager_operation_test") as fc:
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with open(fc.path, 'rb') as fp:
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data = fp.read()
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fd = os.open(fc.path, os.O_RDONLY)
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try:
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max_num_handles = 15
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# small_size =
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for mtype, args in ((StaticWindowMapManager, (0, fc.size // 3, max_num_handles)),
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(SlidingWindowMapManager, (fc.size // 100, fc.size // 3, max_num_handles)),):
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for item in (fc.path, fd):
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assert len(data) == fc.size
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# small windows, a reasonable max memory. Not too many regions at once
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man = mtype(window_size=args[0], max_memory_size=args[1], max_open_handles=args[2])
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c = man.make_cursor(item)
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# still empty (more about that is tested in test_memory_manager()
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assert man.num_open_files() == 0
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assert man.mapped_memory_size() == 0
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base_offset = 5000
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# window size is 0 for static managers, hence size will be 0. We take that into consideration
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size = man.window_size() // 2
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assert c.use_region(base_offset, size).is_valid()
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rr = c.region()
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assert rr.client_count() == 2 # the manager and the cursor and us
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assert man.num_open_files() == 1
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assert man.num_file_handles() == 1
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assert man.mapped_memory_size() == rr.size()
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# assert c.size() == size # the cursor may overallocate in its static version
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assert c.ofs_begin() == base_offset
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assert rr.ofs_begin() == 0 # it was aligned and expanded
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if man.window_size():
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# but isn't larger than the max window (aligned)
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assert rr.size() == align_to_mmap(man.window_size(), True)
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else:
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assert rr.size() == fc.size
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# END ignore static managers which dont use windows and are aligned to file boundaries
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assert c.buffer()[:] == data[base_offset:base_offset + (size or c.size())]
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# obtain second window, which spans the first part of the file - it is a still the same window
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nsize = (size or fc.size) - 10
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assert c.use_region(0, nsize).is_valid()
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assert c.region() == rr
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assert man.num_file_handles() == 1
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assert c.size() == nsize
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assert c.ofs_begin() == 0
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assert c.buffer()[:] == data[:nsize]
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# map some part at the end, our requested size cannot be kept
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overshoot = 4000
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base_offset = fc.size - (size or c.size()) + overshoot
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assert c.use_region(base_offset, size).is_valid()
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if man.window_size():
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assert man.num_file_handles() == 2
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assert c.size() < size
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assert c.region() is not rr # old region is still available, but has not curser ref anymore
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assert rr.client_count() == 1 # only held by manager
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else:
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assert c.size() < fc.size
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# END ignore static managers which only have one handle per file
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rr = c.region()
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assert rr.client_count() == 2 # manager + cursor
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assert rr.ofs_begin() < c.ofs_begin() # it should have extended itself to the left
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assert rr.ofs_end() <= fc.size # it cannot be larger than the file
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assert c.buffer()[:] == data[base_offset:base_offset + (size or c.size())]
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# unising a region makes the cursor invalid
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c.unuse_region()
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assert not c.is_valid()
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if man.window_size():
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# but doesn't change anything regarding the handle count - we cache it and only
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# remove mapped regions if we have to
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assert man.num_file_handles() == 2
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# END ignore this for static managers
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# iterate through the windows, verify data contents
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# this will trigger map collection after a while
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max_random_accesses = 5000
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num_random_accesses = max_random_accesses
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memory_read = 0
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st = time()
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# cache everything to get some more performance
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includes_ofs = c.includes_ofs
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max_mapped_memory_size = man.max_mapped_memory_size()
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max_file_handles = man.max_file_handles()
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mapped_memory_size = man.mapped_memory_size
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num_file_handles = man.num_file_handles
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while num_random_accesses:
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num_random_accesses -= 1
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base_offset = randint(0, fc.size - 1)
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# precondition
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if man.window_size():
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assert max_mapped_memory_size >= mapped_memory_size()
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# END statics will overshoot, which is fine
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assert max_file_handles >= num_file_handles()
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assert c.use_region(base_offset, (size or c.size())).is_valid()
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csize = c.size()
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assert c.buffer()[:] == data[base_offset:base_offset + csize]
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memory_read += csize
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assert includes_ofs(base_offset)
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assert includes_ofs(base_offset + csize - 1)
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assert not includes_ofs(base_offset + csize)
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# END while we should do an access
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elapsed = max(time() - st, 0.001) # prevent zero divison errors on windows
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mb = float(1000 * 1000)
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print("%s: Read %i mb of memory with %i random on cursor initialized with %s accesses in %fs (%f mb/s)\n"
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% (mtype, memory_read / mb, max_random_accesses, type(item), elapsed, (memory_read / mb) / elapsed),
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file=sys.stderr)
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# an offset as large as the size doesn't work !
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assert not c.use_region(fc.size, size).is_valid()
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# collection - it should be able to collect all
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assert man.num_file_handles()
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assert man.collect()
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assert man.num_file_handles() == 0
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# END for each item
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# END for each manager type
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finally:
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os.close(fd)
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