Add basic read hit performance tests for CAS.
Tested in 'Write-Through' and 'Write-Back' mode. Signed-off-by: Klaudia Jablonska <klaudia.jablonska@intel.com>
This commit is contained in:
Klaudia Jablonska
parent
f1161e04d7
commit
08e15b6bdc
277
test/functional/tests/performance/test_performance_reads.py
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277
test/functional/tests/performance/test_performance_reads.py
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#
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# Copyright(c) 2022 Intel Corporation
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# SPDX-License-Identifier: BSD-3-Clause
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#
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from datetime import timedelta
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import pytest
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from api.cas import casadm
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from api.cas.cache_config import CacheLineSize, CacheMode, SeqCutOffPolicy
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from core.test_run import TestRun
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from storage_devices.disk import DiskType, DiskTypeSet, DiskTypeLowerThan
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from test_tools.fio.fio import Fio
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from test_tools.fio.fio_param import ReadWrite, IoEngine, CpusAllowedPolicy
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from test_utils.os_utils import (
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get_number_of_processors_from_cpuinfo,
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set_wbt_lat,
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get_dut_cpu_physical_cores,
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)
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from test_utils.size import Unit, Size
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def fill_cas_cache(target, bs):
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(
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Fio()
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.create_command()
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.target(target)
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.direct()
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.num_jobs(1)
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.read_write(ReadWrite.read)
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.io_engine(IoEngine.libaio)
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.cpus_allowed(get_dut_cpu_physical_cores())
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.cpus_allowed_policy(CpusAllowedPolicy.split)
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.block_size(bs)
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.io_depth(32)
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.file_size(target.size)
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.run()
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)
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# TODO: for disks other than Intel Optane, fio ramp is needed before fio tests on raw disk
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@pytest.mark.require_disk("cache", DiskTypeSet([DiskType.optane]))
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@pytest.mark.require_disk("core", DiskTypeLowerThan("cache"))
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@pytest.mark.parametrizex("block_size", [Size(1, Unit.Blocks4096), Size(8, Unit.Blocks4096)])
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@pytest.mark.parametrizex("queue_depth", [1, 16, 32])
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@pytest.mark.parametrizex("cache_line_size", CacheLineSize)
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def test_performance_read_hit_wt(cache_line_size, block_size, queue_depth):
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"""
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title: Test CAS reads performance for write-through mode.
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description: |
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Compare read hit performance (throughput and latency) for Open CAS vs raw device
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for different start command options.Open CAS in Write-Through mode device should
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provide comparable throughput to bare cache device.
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pass_criteria:
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- passes performance threshold
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"""
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processors_number = get_number_of_processors_from_cpuinfo()
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num_jobs = [int(processors_number / 2), processors_number]
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data_size = Size(20, Unit.GibiByte)
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cache_size = Size(24, Unit.GibiByte)
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fio_command = (
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Fio()
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.create_command()
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.direct()
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.read_write(ReadWrite.randread)
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.io_engine(IoEngine.libaio)
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.cpus_allowed(get_dut_cpu_physical_cores())
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.cpus_allowed_policy(CpusAllowedPolicy.split)
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.block_size(block_size)
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.io_depth(queue_depth)
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.file_size(data_size)
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.run_time(timedelta(seconds=450))
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)
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with TestRun.step("Prepare partitions for cache and core"):
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cache_device = TestRun.disks["cache"]
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cache_device.create_partitions([cache_size])
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cache_part = cache_device.partitions[0]
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core_device = TestRun.disks["core"]
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core_device.create_partitions([data_size])
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core_part = core_device.partitions[0]
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with TestRun.step("Measure read performance (throughput and latency) on raw disk."):
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fio_command.target(cache_part)
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raw_disk_results = {}
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for nj in num_jobs:
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fio_command.num_jobs(nj)
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raw_disk_results[nj] = fio_command.run().pop()
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TestRun.LOGGER.info(str(raw_disk_results[nj]))
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with TestRun.step("Start cache and add core device"):
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cache = casadm.start_cache(cache_part, CacheMode.WT, cache_line_size, cache_id=1)
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cache.set_seq_cutoff_policy(SeqCutOffPolicy.never)
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core = cache.add_core(core_part, core_id=1)
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with TestRun.step("Ensure that I/O scheduler for CAS device is 'none'"):
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TestRun.executor.run_expect_success("sudo echo none > /sys/block/cas1-1/queue/scheduler")
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with TestRun.step("Fill the cache with data via CAS device"):
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fill_cas_cache(core, cache_line_size)
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casadm.reset_counters(1, 1)
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with TestRun.step("Measure read performance (throughput and latency) on CAS device"):
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fio_command.target(core)
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cas_results = {}
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for nj in num_jobs:
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fio_command.num_jobs(nj)
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cas_results[nj] = fio_command.run().pop()
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TestRun.LOGGER.info(str(cas_results[nj]))
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with TestRun.step("Check if read hit percentage during fio is greater or equal to 99"):
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cache_stats = cache.get_statistics()
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read_hits = cache_stats.request_stats.read.hits
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read_total = cache_stats.request_stats.read.total
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read_hits_percentage = read_hits / read_total * 100
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if read_hits_percentage <= 99:
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TestRun.LOGGER.error(
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f"Read hits percentage too low: {read_hits_percentage}%\n"
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f"Read hits: {read_hits}, read total: {read_total}"
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)
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with TestRun.step("Compare fio results"):
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for nj in num_jobs:
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cas_latency = cas_results[nj].read_completion_latency_average().microseconds
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raw_disk_latency = raw_disk_results[nj].read_completion_latency_average().microseconds
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cas_read_iops = cas_results[nj].read_iops()
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raw_disk_iops = raw_disk_results[nj].read_iops()
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read_iops_ratio = (100 * cas_read_iops) / raw_disk_iops
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TestRun.LOGGER.info(
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f"Results for num_jobs={nj}, queue_depth={queue_depth},"
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f" block_size={block_size}, cache_line_size={cache_line_size}"
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)
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TestRun.LOGGER.info("Average read latency (us):")
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TestRun.LOGGER.info(f" - (raw disk) {raw_disk_latency}")
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TestRun.LOGGER.info(f" - (CAS device) {cas_latency}")
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TestRun.LOGGER.info("Average read throughput (IOPS):")
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TestRun.LOGGER.info(f" - (raw disk) {raw_disk_iops}")
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TestRun.LOGGER.info(f" - (CAS device) {cas_read_iops}")
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TestRun.LOGGER.info(f"Read ratio: {read_iops_ratio}")
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if read_iops_ratio < 85:
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TestRun.LOGGER.error(f"The read iops ratio is below expected threshold (85%).")
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# TODO: for disks other than Intel Optane, fio ramp is needed before fio tests on raw disk
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@pytest.mark.require_disk("cache", DiskTypeSet([DiskType.optane]))
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@pytest.mark.require_disk("core", DiskTypeLowerThan("cache"))
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@pytest.mark.parametrizex("block_size", [Size(1, Unit.Blocks4096), Size(8, Unit.Blocks4096)])
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@pytest.mark.parametrizex("queue_depth", [1, 16, 32])
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@pytest.mark.parametrizex("cache_line_size", CacheLineSize)
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def test_performance_read_hit_wb(cache_line_size, block_size, queue_depth):
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"""
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title: Test CAS read/write hit performance for write-back mode.
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description: |
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Compare read/write hit performance (throughput and latency)
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for Open CAS vs raw device. Open CAS in Write-Back mode device
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should provide comparable throughput to bare cache device.
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pass_criteria:
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- passes performance threshold
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"""
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processors_number = get_number_of_processors_from_cpuinfo()
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num_jobs = [int(processors_number / 2), processors_number]
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data_size = Size(20, Unit.GibiByte)
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cache_size = Size(24, Unit.GibiByte)
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fio_command = (
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Fio()
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.create_command()
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.direct()
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.read_write(ReadWrite.randrw)
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.write_percentage(30)
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.io_engine(IoEngine.libaio)
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.cpus_allowed(get_dut_cpu_physical_cores())
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.cpus_allowed_policy(CpusAllowedPolicy.split)
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.block_size(block_size)
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.io_depth(queue_depth)
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.file_size(data_size)
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.run_time(timedelta(seconds=450))
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)
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with TestRun.step("Prepare partitions for cache and core"):
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cache_device = TestRun.disks["cache"]
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cache_device.create_partitions([cache_size])
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cache_part = cache_device.partitions[0]
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core_device = TestRun.disks["core"]
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core_device.create_partitions([data_size])
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core_part = core_device.partitions[0]
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with TestRun.step("Measure read/write performance (throughput and latency) on raw disk."):
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fio_command.target(cache_part)
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raw_disk_results = {}
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for nj in num_jobs:
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fio_command.num_jobs(nj)
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raw_disk_results[nj] = fio_command.run().pop()
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TestRun.LOGGER.info(str(raw_disk_results[nj]))
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with TestRun.step("Start cache and add core device"):
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cache = casadm.start_cache(cache_part, CacheMode.WB, cache_line_size, cache_id=1)
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cache.set_seq_cutoff_policy(SeqCutOffPolicy.never)
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core = cache.add_core(core_part, core_id=1)
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with TestRun.step("Ensure that I/O scheduler for CAS device is 'none'"):
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TestRun.executor.run_expect_success("sudo echo none > /sys/block/cas1-1/queue/scheduler")
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with TestRun.step("Fill the cache with data via CAS device"):
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# TODO add Device.fill_with_data api ?
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fill_cas_cache(core, cache_line_size)
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casadm.reset_counters(1, 1)
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with TestRun.step("Measure read performance (throughput and latency) on CAS device"):
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fio_command.target(core)
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cas_results = {}
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for nj in num_jobs:
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fio_command.num_jobs(nj)
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cas_results[nj] = fio_command.run().pop()
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TestRun.LOGGER.info(str(cas_results[nj]))
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with TestRun.step("Check if hit percentage during fio is greater or equal to 99"):
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cache_stats = cache.get_statistics()
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hits = cache_stats.request_stats.read.hits + cache_stats.request_stats.write.hits
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total = cache_stats.request_stats.read.total + cache_stats.request_stats.write.total
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hits_percentage = hits / total * 100
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if hits_percentage <= 99:
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TestRun.LOGGER.error(
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f"Hits percentage too low: {hits_percentage}% (hits: {hits}, total: {total})"
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)
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with TestRun.step("Compare fio results"):
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for nj in num_jobs:
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cas_read_latency = cas_results[nj].read_completion_latency_average().microseconds
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cas_write_latency = cas_results[nj].write_completion_latency_average().microseconds
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disk_read_latency = raw_disk_results[nj].read_completion_latency_average().microseconds
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disk_write_latency = (
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raw_disk_results[nj].write_completion_latency_average().microseconds
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)
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cas_read_iops = cas_results[nj].read_iops()
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disk_read_iops = raw_disk_results[nj].read_iops()
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read_iops_ratio = (100 * cas_read_iops) / disk_read_iops
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cas_write_iops = cas_results[nj].write_iops()
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disk_write_iops = raw_disk_results[nj].write_iops()
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write_iops_ratio = (100 * cas_write_iops) / disk_write_iops
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TestRun.LOGGER.info(
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f"Results for num_jobs={nj}, queue_depth={queue_depth},"
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f" block_size={block_size}, cache_line_size={cache_line_size}"
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)
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TestRun.LOGGER.info("Average read/write latency (us):")
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TestRun.LOGGER.info(f" - (disk) {disk_read_latency}/{disk_write_latency}")
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TestRun.LOGGER.info(f" - (CAS) {cas_read_latency}/{cas_write_latency}")
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TestRun.LOGGER.info("Average read/write throughput (IOPS):")
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TestRun.LOGGER.info(f" - (disk) {disk_read_iops}/{raw_disk_results[nj].write_iops()}")
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TestRun.LOGGER.info(f" - (CAS) {cas_read_iops}/{cas_results[nj].write_iops()}")
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TestRun.LOGGER.info(f"Read ratio: {read_iops_ratio}")
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TestRun.LOGGER.info(f"Write ratio: {write_iops_ratio}")
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if read_iops_ratio < 90:
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TestRun.LOGGER.error(f"The read iops ratio is below expected threshold (90%).")
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if write_iops_ratio < 90:
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TestRun.LOGGER.error(f"The write iops ratio is below expected threshold (90%).")
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@pytest.fixture(scope="session", autouse=True)
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def disable_wbt_throttling():
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TestRun.LOGGER.info("Disabling write-back throttling for cache and core devices")
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set_wbt_lat(TestRun.disks["cache"], 0)
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set_wbt_lat(TestRun.disks["core"], 0)
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