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| Original file line number | Diff line number | Diff line change |
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| # Copyright 2023 Amazon.com, Inc. or its affiliates. All Rights Reserved. | ||
| # SPDX-License-Identifier: Apache-2.0 | ||
| """Performance benchmark for block device emulation.""" | ||
|
|
||
| import concurrent | ||
| import os | ||
| import shutil | ||
| from pathlib import Path | ||
|
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||
| import pytest | ||
|
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| import host_tools.drive as drive_tools | ||
| from framework.utils import CmdBuilder, get_cpu_percent, run_cmd | ||
|
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| # size of the block device used in the test, in MB | ||
| BLOCK_DEVICE_SIZE_MB = 2048 | ||
|
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| # Time (in seconds) for which fio "warms up" | ||
| WARMUP_SEC = 10 | ||
|
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| # Time (in seconds) for which fio runs after warmup is done | ||
| RUNTIME_SEC = 30 | ||
|
|
||
| # VM guest memory size | ||
| GUEST_MEM_MIB = 1024 | ||
|
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|
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| def prepare_microvm_for_test(microvm): | ||
| """Prepares the microvm for running a fio-based performance test by tweaking | ||
| various performance related parameters.""" | ||
| rc, _, stderr = microvm.ssh.run("echo 'none' > /sys/block/vdb/queue/scheduler") | ||
| assert rc == 0, stderr | ||
| assert stderr == "" | ||
|
|
||
| # First, flush all guest cached data to host, then drop guest FS caches. | ||
| rc, _, stderr = microvm.ssh.run("sync") | ||
| assert rc == 0, stderr | ||
| assert stderr == "" | ||
| rc, _, stderr = microvm.ssh.run("echo 3 > /proc/sys/vm/drop_caches") | ||
| assert rc == 0, stderr | ||
| assert stderr == "" | ||
|
|
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| # Then, flush all host cached data to hardware, also drop host FS caches. | ||
| run_cmd("sync") | ||
| run_cmd("echo 3 > /proc/sys/vm/drop_caches") | ||
|
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|
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| def run_fio(microvm, mode, block_size): | ||
| """Run a fio test in the specified mode with block size bs.""" | ||
| cmd = ( | ||
| CmdBuilder("fio") | ||
| .with_arg(f"--name={mode}-{block_size}") | ||
| .with_arg(f"--rw={mode}") | ||
| .with_arg(f"--bs={block_size}") | ||
| .with_arg("--filename=/dev/vdb") | ||
| .with_arg("--time_base=1") | ||
| .with_arg(f"--size={BLOCK_DEVICE_SIZE_MB}M") | ||
| .with_arg("--direct=1") | ||
| .with_arg("--ioengine=libaio") | ||
| .with_arg("--iodepth=32") | ||
| .with_arg(f"--ramp_time={WARMUP_SEC}") | ||
| .with_arg(f"--numjobs={microvm.vcpus_count}") | ||
| # Set affinity of the entire fio process to a set of vCPUs equal in size to number of workers | ||
| .with_arg( | ||
| f"--cpus_allowed={','.join(str(i) for i in range(microvm.vcpus_count))}" | ||
| ) | ||
| # Instruct fio to pin one worker per vcpu | ||
| .with_arg("--cpus_allowed_policy=split") | ||
| .with_arg("--randrepeat=0") | ||
| .with_arg(f"--runtime={RUNTIME_SEC}") | ||
| .with_arg(f"--write_bw_log={mode}") | ||
| .with_arg("--log_avg_msec=1000") | ||
| .with_arg("--output-format=json+") | ||
| .build() | ||
| ) | ||
|
|
||
| logs_path = Path(microvm.jailer.chroot_base_with_id()) / "fio_output" | ||
|
|
||
| if logs_path.is_dir(): | ||
| shutil.rmtree(logs_path) | ||
|
|
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| logs_path.mkdir() | ||
|
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| prepare_microvm_for_test(microvm) | ||
|
|
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| # Start the CPU load monitor. | ||
| with concurrent.futures.ThreadPoolExecutor() as executor: | ||
| cpu_load_future = executor.submit( | ||
| get_cpu_percent, | ||
| microvm.jailer_clone_pid, | ||
| RUNTIME_SEC, | ||
| omit=WARMUP_SEC, | ||
| ) | ||
|
|
||
| # Print the fio command in the log and run it | ||
| rc, _, stderr = microvm.ssh.run(f"cd /tmp; {cmd}") | ||
| assert rc == 0, stderr | ||
| assert stderr == "" | ||
|
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| microvm.ssh.scp_get("/tmp/*.log", logs_path) | ||
| rc, _, stderr = microvm.ssh.run("rm /tmp/*.log") | ||
| assert rc == 0, stderr | ||
|
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| return logs_path, cpu_load_future.result() | ||
|
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| def process_fio_logs(vm, fio_mode, logs_dir, metrics): | ||
| """Parses the fio logs in `{logs_dir}/{fio_mode}_bw.*.log and emits their contents as CloudWatch metrics""" | ||
| for job_id in range(vm.vcpus_count): | ||
| data = Path(f"{logs_dir}/{fio_mode}_bw.{job_id + 1}.log").read_text("UTF-8") | ||
|
|
||
| for line in data.splitlines(): | ||
| _, value, direction, _ = line.split(",", maxsplit=3) | ||
| value = int(value.strip()) | ||
|
|
||
| # See https://fio.readthedocs.io/en/latest/fio_doc.html#log-file-formats | ||
| match direction.strip(): | ||
| case "0": | ||
| metrics.put_metric("bw_read", value, "Kilobytes/Second") | ||
| case "1": | ||
| metrics.put_metric("bw_write", value, "Kilobytes/Second") | ||
| case _: | ||
| assert False | ||
|
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|
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| @pytest.mark.nonci | ||
| @pytest.mark.timeout(RUNTIME_SEC * 1000) # 1.40 hours | ||
| @pytest.mark.parametrize("vcpus", [1, 2], ids=["1vcpu", "2vcpu"]) | ||
| @pytest.mark.parametrize("fio_mode", ["randread", "randwrite"]) | ||
| @pytest.mark.parametrize("fio_block_size", [4096], ids=["bs4096"]) | ||
| def test_block_performance( | ||
| microvm_factory, | ||
| guest_kernel, | ||
| rootfs, | ||
| vcpus, | ||
| fio_mode, | ||
| fio_block_size, | ||
| io_engine, | ||
| metrics, | ||
| ): | ||
| """ | ||
| Execute block device emulation benchmarking scenarios. | ||
| """ | ||
| vm = microvm_factory.build(guest_kernel, rootfs, monitor_memory=False) | ||
| vm.spawn(log_level="Info") | ||
| vm.basic_config(vcpu_count=vcpus, mem_size_mib=GUEST_MEM_MIB) | ||
| vm.add_net_iface() | ||
| # Add a secondary block device for benchmark tests. | ||
| fs = drive_tools.FilesystemFile( | ||
| os.path.join(vm.fsfiles, "scratch"), BLOCK_DEVICE_SIZE_MB | ||
| ) | ||
| vm.add_drive("scratch", fs.path, io_engine=io_engine) | ||
| vm.start() | ||
|
|
||
| # Pin uVM threads to physical cores. | ||
| assert vm.pin_vmm(0), "Failed to pin firecracker thread." | ||
| assert vm.pin_api(1), "Failed to pin fc_api thread." | ||
| for i in range(vm.vcpus_count): | ||
| assert vm.pin_vcpu(i, i + 2), f"Failed to pin fc_vcpu {i} thread." | ||
|
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| logs_dir, cpu_load = run_fio(vm, fio_mode, fio_block_size) | ||
|
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| process_fio_logs(vm, fio_mode, logs_dir, metrics) | ||
|
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| for cpu_util_data_point in list(cpu_load["firecracker"].values())[0]: | ||
| metrics.put_metric("cpu_utilization_vmm", cpu_util_data_point, "Percent") | ||
|
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||
| metrics.set_dimensions( | ||
| { | ||
| "performance_test": "test_block_performance", | ||
| "io_engine": io_engine, | ||
| "fio_mode": fio_mode, | ||
| "fio_block_size": str(fio_block_size), | ||
| **vm.dimensions, | ||
| } | ||
| ) |
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