def test_stop(pyocf_ctx, mode: CacheMode, cls: CacheLineSize, with_flush: bool):
"""Stopping cache.
Check if cache is stopped properly in different modes with or without preceding flush operation.
"""
cache_device = Volume(Size.from_MiB(20))
core_device = Volume(Size.from_MiB(5))
cache = Cache.start_on_device(cache_device, cache_mode=mode, cache_line_size=cls)
core_exported = Core.using_device(core_device)
cache.add_core(core_exported)
cls_no = 10
run_io_and_cache_data_if_possible(core_exported, mode, cls, cls_no)
stats = cache.get_stats()
assert int(stats["conf"]["dirty"]) == (cls_no if mode.lazy_write() else 0),\
"Dirty data before MD5"
md5_exported_core = core_exported.exp_obj_md5()
if with_flush:
cache.flush()
cache.stop()
if mode.lazy_write() and not with_flush:
assert core_device.md5() != md5_exported_core, \
"MD5 check: core device vs exported object with dirty data"
else:
assert core_device.md5() == md5_exported_core, \
"MD5 check: core device vs exported object with clean data"
def check_stats_write_empty(exported_obj: Core, mode: CacheMode, cls: CacheLineSize):
stats = exported_obj.cache.get_stats()
assert stats["conf"]["cache_mode"] == mode, "Cache mode"
# TODO(ajrutkow): why 1 for WT ??
assert exported_obj.cache.device.get_stats()[IoDir.WRITE] == \
(2 if mode.lazy_write() else (1 if mode == CacheMode.WT else 0)), \
"Writes to cache device"
assert exported_obj.device.get_stats()[IoDir.WRITE] == (0 if mode.lazy_write() else 1), \
"Writes to core device"
assert stats["req"]["wr_full_misses"]["value"] == (1 if mode.write_insert() else 0), \
"Write full misses"
assert stats["usage"]["occupancy"]["value"] == \
((cls / CacheLineSize.LINE_4KiB) if mode.write_insert() else 0), \
"Occupancy"
def check_stats_write_after_read(exported_obj: Core,
mode: CacheMode,
cls: CacheLineSize,
read_from_empty=False):
stats = exported_obj.cache.get_stats()
assert exported_obj.cache.device.get_stats()[IoDir.WRITE] == \
(0 if mode in {CacheMode.WI, CacheMode.PT} else
(2 if read_from_empty and mode.lazy_write() else 1)), \
"Writes to cache device"
assert exported_obj.device.get_stats()[IoDir.WRITE] == (0 if mode.lazy_write() else 1), \
"Writes to core device"
assert stats["req"]["wr_hits"]["value"] == \
(1 if (mode.read_insert() and mode != CacheMode.WI)
or (mode.write_insert() and not read_from_empty) else 0), \
"Write hits"
assert stats["usage"]["occupancy"]["value"] == \
(0 if mode in {CacheMode.WI, CacheMode.PT} else (cls / CacheLineSize.LINE_4KiB)), \
"Occupancy"
def check_md5_sums(exported_obj: Core, mode: CacheMode):
if mode.lazy_write():
assert exported_obj.device.md5() != exported_obj.exp_obj_md5(), \
"MD5 check: core device vs exported object without flush"
exported_obj.cache.flush()
assert exported_obj.device.md5() == exported_obj.exp_obj_md5(), \
"MD5 check: core device vs exported object after flush"
else:
assert exported_obj.device.md5() == exported_obj.exp_obj_md5(), \
"MD5 check: core device vs exported object"
def check_md5_sums(core: Core, mode: CacheMode):
if mode.lazy_write():
assert core.device.md5() != core.get_front_volume().md5(), \
"MD5 check: core device vs exported object without flush"
core.cache.flush()
assert core.device.md5() == core.get_front_volume().md5(), \
"MD5 check: core device vs exported object after flush"
else:
assert core.device.md5() == core.get_front_volume().md5(), \
"MD5 check: core device vs exported object"