Merge pull request #381 from Ostrokrzew/flush_concurrent
Add test for concurrent flushing processes
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Robert Baldyga
GitHub
commit
97f160f1c3
194
test/functional/tests/cache_ops/test_concurrent_flushes.py
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194
test/functional/tests/cache_ops/test_concurrent_flushes.py
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#
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# Copyright(c) 2020 Intel Corporation
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# SPDX-License-Identifier: BSD-3-Clause-Clear
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#
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from time import sleep
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import pytest
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from api.cas import casadm, casadm_parser, cli
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from api.cas.cache_config import CacheMode, CleaningPolicy, CacheModeTrait, SeqCutOffPolicy
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from storage_devices.disk import DiskType, DiskTypeSet, DiskTypeLowerThan
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from core.test_run import TestRun
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from test_tools.dd import Dd
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from test_utils.output import CmdException
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from test_utils.size import Size, Unit
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cache_size = Size(2, Unit.GibiByte)
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caches_number = 3
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@pytest.mark.parametrize("cache_mode", CacheMode.with_traits(CacheModeTrait.LazyWrites))
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@pytest.mark.require_disk("cache", DiskTypeSet([DiskType.optane, DiskType.nand]))
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@pytest.mark.require_disk("core", DiskTypeLowerThan("cache"))
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def test_concurrent_cores_flush(cache_mode):
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"""
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title: Fail to flush two cores simultaneously.
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description: |
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CAS should return an error on attempt to flush second core if there is already
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one flush in progress.
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pass_criteria:
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- No system crash.
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- First core flushing should finish successfully.
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- It should not be possible to run flushing command on cores within
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the same cache simultaneously.
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"""
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with TestRun.step("Prepare cache and core."):
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cache_dev = TestRun.disks['cache']
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cache_dev.create_partitions([cache_size])
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cache_part = cache_dev.partitions[0]
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core_dev = TestRun.disks['core']
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core_dev.create_partitions([cache_size * 2] * 2)
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core_part1 = core_dev.partitions[0]
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core_part2 = core_dev.partitions[1]
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with TestRun.step("Start cache."):
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cache = casadm.start_cache(cache_part, cache_mode, force=True)
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with TestRun.step("Disable cleaning and sequential cutoff."):
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cache.set_cleaning_policy(CleaningPolicy.nop)
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cache.set_seq_cutoff_policy(SeqCutOffPolicy.never)
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with TestRun.step(f"Add both core devices to cache."):
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core1 = cache.add_core(core_part1)
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core2 = cache.add_core(core_part2)
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with TestRun.step("Run workload on concurrent cores."):
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block_size = Size(4, Unit.MebiByte)
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count = int(cache_size.value / 2 / block_size.value)
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dd_pid = Dd().output(core1.system_path) \
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.input("/dev/urandom") \
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.block_size(block_size) \
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.count(count) \
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.run_in_background()
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Dd().output(core2.system_path) \
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.input("/dev/urandom") \
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.block_size(block_size) \
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.count(count) \
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.run()
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with TestRun.step("Check if both DD operations finished."):
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while TestRun.executor.run(f"ls /proc/{dd_pid}").exit_code == 0:
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sleep(1)
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with TestRun.step("Check if both cores contain dirty blocks."):
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if int(core1.get_dirty_blocks()) == 0:
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TestRun.fail("The first core does not contain dirty blocks.")
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if int(core2.get_dirty_blocks()) == 0:
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TestRun.fail("The second core does not contain dirty blocks.")
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core2_dirty_blocks_before = int(core2.get_dirty_blocks())
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with TestRun.step("Start flushing the first core."):
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TestRun.executor.run_in_background(
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cli.flush_core_cmd(str(cache.cache_id), str(core1.core_id))
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)
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with TestRun.step("Wait some time and start flushing the second core."):
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sleep(2)
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percentage = casadm_parser.get_flushing_progress(cache.cache_id, core1.core_id)
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while percentage < 40:
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percentage = casadm_parser.get_flushing_progress(cache.cache_id, core1.core_id)
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try:
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core2.flush_core()
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TestRun.fail("The first core is flushing right now so flush attempt of the second core "
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"should fail.")
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except CmdException:
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TestRun.LOGGER.info("The first core is flushing right now so the second core's flush "
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"fails as expected.")
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with TestRun.step("Wait for the first core to finish flushing."):
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try:
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percentage = casadm_parser.get_flushing_progress(cache.cache_id, core1.core_id)
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while percentage < 100:
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percentage = casadm_parser.get_flushing_progress(cache.cache_id, core1.core_id)
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except CmdException:
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TestRun.LOGGER.info("The first core is not flushing dirty data anymore.")
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with TestRun.step("Check number of dirty data on both cores."):
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if int(core1.get_dirty_blocks()) > 0:
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TestRun.LOGGER.error("The quantity of dirty cache lines on the first core "
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"after completed flush should be zero.")
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core2_dirty_blocks_after = int(core2.get_dirty_blocks())
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if core2_dirty_blocks_before != core2_dirty_blocks_after:
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TestRun.LOGGER.error("The quantity of dirty cache lines on the second core "
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"after failed flush should not change.")
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with TestRun.step("Stop cache."):
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cache.stop()
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@pytest.mark.parametrize("cache_mode", CacheMode.with_traits(CacheModeTrait.LazyWrites))
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@pytest.mark.require_disk("cache", DiskTypeSet([DiskType.optane, DiskType.nand]))
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@pytest.mark.require_disk("core", DiskTypeLowerThan("cache"))
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def test_concurrent_caches_flush(cache_mode):
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"""
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title: Success to flush two caches simultaneously.
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description: |
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CAS should successfully flush multiple caches if there is already other flush in progress.
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pass_criteria:
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- No system crash.
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- Flush for each cache should finish successfully.
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"""
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with TestRun.step("Prepare caches and cores."):
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cache_dev = TestRun.disks['cache']
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cache_dev.create_partitions([cache_size] * caches_number)
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core_dev = TestRun.disks['core']
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core_dev.create_partitions([cache_size * 2] * caches_number)
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with TestRun.step(f"Start {caches_number} caches."):
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caches = []
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for part in cache_dev.partitions:
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caches.append(casadm.start_cache(part, cache_mode, force=True))
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with TestRun.step("Disable cleaning and sequential cutoff."):
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for cache in caches:
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cache.set_cleaning_policy(CleaningPolicy.nop)
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cache.set_seq_cutoff_policy(SeqCutOffPolicy.never)
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with TestRun.step(f"Add core devices to caches."):
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cores = []
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for i, cache in enumerate(caches):
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cores.append(cache.add_core(core_dev.partitions[i]))
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with TestRun.step("Run workload on each OpenCAS device."):
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# Each cache has one core fully saturated with dirty blocks.
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block_size = Size(4, Unit.MebiByte)
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count = int(cache_size.value / block_size.value)
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total_saturation = block_size * count
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for core in cores:
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Dd().output(core.system_path) \
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.input("/dev/urandom") \
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.block_size(block_size) \
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.count(count) \
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.run()
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with TestRun.step("Check if each cache is full of dirty blocks."):
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for cache in caches:
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if not int(cache.get_dirty_blocks()) != total_saturation.get_value(Unit.Blocks4096):
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TestRun.fail(f"The cache {cache.cache_id} does not contain dirty blocks.")
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with TestRun.step("Start flushing all caches simultaneously."):
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flush_pids = []
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for cache in caches:
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flush_pids.append(
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TestRun.executor.run_in_background(cli.flush_cache_cmd(str(cache.cache_id)))
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)
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with TestRun.step("Wait for all caches to finish flushing."):
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is_flushing = [True] * len(flush_pids)
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while any(is_flushing):
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for i, pid in enumerate(flush_pids):
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is_flushing[i] = (TestRun.executor.run(f"ls /proc/{pid}").exit_code == 0)
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with TestRun.step("Check number of dirty data on each cache."):
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for cache in caches:
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if int(cache.get_dirty_blocks()) > 0:
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TestRun.LOGGER.error(f"The quantity of dirty cache lines on the cache "
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f"{str(cache.cache_id)} after complete flush should be zero.")
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with TestRun.step("Stop all caches."):
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casadm.stop_all_caches()
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