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8504dea783
Add a script which can be used to generate device-specific iocost linear model coefficients. Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
179 lines
6.8 KiB
Python
179 lines
6.8 KiB
Python
#!/usr/bin/env python3
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#
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# Copyright (C) 2019 Tejun Heo <tj@kernel.org>
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# Copyright (C) 2019 Andy Newell <newella@fb.com>
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# Copyright (C) 2019 Facebook
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desc = """
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Generate linear IO cost model coefficients used by the blk-iocost
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controller. If the target raw testdev is specified, destructive tests
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are performed against the whole device; otherwise, on
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./iocost-coef-fio.testfile. The result can be written directly to
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/sys/fs/cgroup/io.cost.model.
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On high performance devices, --numjobs > 1 is needed to achieve
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saturation.
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See Documentation/admin-guide/cgroup-v2.rst and block/blk-iocost.c
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for more details.
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"""
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import argparse
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import re
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import json
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import glob
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import os
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import sys
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import atexit
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import shutil
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import tempfile
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import subprocess
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parser = argparse.ArgumentParser(description=desc,
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formatter_class=argparse.RawTextHelpFormatter)
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parser.add_argument('--testdev', metavar='DEV',
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help='Raw block device to use for testing, ignores --testfile-size')
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parser.add_argument('--testfile-size-gb', type=float, metavar='GIGABYTES', default=16,
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help='Testfile size in gigabytes (default: %(default)s)')
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parser.add_argument('--duration', type=int, metavar='SECONDS', default=120,
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help='Individual test run duration in seconds (default: %(default)s)')
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parser.add_argument('--seqio-block-mb', metavar='MEGABYTES', type=int, default=128,
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help='Sequential test block size in megabytes (default: %(default)s)')
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parser.add_argument('--seq-depth', type=int, metavar='DEPTH', default=64,
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help='Sequential test queue depth (default: %(default)s)')
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parser.add_argument('--rand-depth', type=int, metavar='DEPTH', default=64,
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help='Random test queue depth (default: %(default)s)')
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parser.add_argument('--numjobs', type=int, metavar='JOBS', default=1,
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help='Number of parallel fio jobs to run (default: %(default)s)')
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parser.add_argument('--quiet', action='store_true')
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parser.add_argument('--verbose', action='store_true')
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def info(msg):
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if not args.quiet:
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print(msg)
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def dbg(msg):
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if args.verbose and not args.quiet:
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print(msg)
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# determine ('DEVNAME', 'MAJ:MIN') for @path
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def dir_to_dev(path):
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# find the block device the current directory is on
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devname = subprocess.run(f'findmnt -nvo SOURCE -T{path}',
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stdout=subprocess.PIPE, shell=True).stdout
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devname = os.path.basename(devname).decode('utf-8').strip()
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# partition -> whole device
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parents = glob.glob('/sys/block/*/' + devname)
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if len(parents):
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devname = os.path.basename(os.path.dirname(parents[0]))
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rdev = os.stat(f'/dev/{devname}').st_rdev
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return (devname, f'{os.major(rdev)}:{os.minor(rdev)}')
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def create_testfile(path, size):
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global args
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if os.path.isfile(path) and os.stat(path).st_size == size:
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return
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info(f'Creating testfile {path}')
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subprocess.check_call(f'rm -f {path}', shell=True)
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subprocess.check_call(f'touch {path}', shell=True)
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subprocess.call(f'chattr +C {path}', shell=True)
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subprocess.check_call(
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f'pv -s {size} -pr /dev/urandom {"-q" if args.quiet else ""} | '
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f'dd of={path} count={size} '
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f'iflag=count_bytes,fullblock oflag=direct bs=16M status=none',
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shell=True)
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def run_fio(testfile, duration, iotype, iodepth, blocksize, jobs):
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global args
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eta = 'never' if args.quiet else 'always'
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outfile = tempfile.NamedTemporaryFile()
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cmd = (f'fio --direct=1 --ioengine=libaio --name=coef '
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f'--filename={testfile} --runtime={round(duration)} '
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f'--readwrite={iotype} --iodepth={iodepth} --blocksize={blocksize} '
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f'--eta={eta} --output-format json --output={outfile.name} '
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f'--time_based --numjobs={jobs}')
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if args.verbose:
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dbg(f'Running {cmd}')
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subprocess.check_call(cmd, shell=True)
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with open(outfile.name, 'r') as f:
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d = json.loads(f.read())
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return sum(j['read']['bw_bytes'] + j['write']['bw_bytes'] for j in d['jobs'])
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def restore_elevator_nomerges():
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global elevator_path, nomerges_path, elevator, nomerges
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info(f'Restoring elevator to {elevator} and nomerges to {nomerges}')
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with open(elevator_path, 'w') as f:
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f.write(elevator)
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with open(nomerges_path, 'w') as f:
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f.write(nomerges)
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args = parser.parse_args()
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missing = False
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for cmd in [ 'findmnt', 'pv', 'dd', 'fio' ]:
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if not shutil.which(cmd):
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print(f'Required command "{cmd}" is missing', file=sys.stderr)
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missing = True
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if missing:
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sys.exit(1)
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if args.testdev:
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devname = os.path.basename(args.testdev)
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rdev = os.stat(f'/dev/{devname}').st_rdev
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devno = f'{os.major(rdev)}:{os.minor(rdev)}'
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testfile = f'/dev/{devname}'
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info(f'Test target: {devname}({devno})')
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else:
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devname, devno = dir_to_dev('.')
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testfile = 'iocost-coef-fio.testfile'
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testfile_size = int(args.testfile_size_gb * 2 ** 30)
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create_testfile(testfile, testfile_size)
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info(f'Test target: {testfile} on {devname}({devno})')
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elevator_path = f'/sys/block/{devname}/queue/scheduler'
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nomerges_path = f'/sys/block/{devname}/queue/nomerges'
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with open(elevator_path, 'r') as f:
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elevator = re.sub(r'.*\[(.*)\].*', r'\1', f.read().strip())
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with open(nomerges_path, 'r') as f:
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nomerges = f.read().strip()
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info(f'Temporarily disabling elevator and merges')
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atexit.register(restore_elevator_nomerges)
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with open(elevator_path, 'w') as f:
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f.write('none')
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with open(nomerges_path, 'w') as f:
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f.write('1')
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info('Determining rbps...')
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rbps = run_fio(testfile, args.duration, 'read',
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1, args.seqio_block_mb * (2 ** 20), args.numjobs)
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info(f'\nrbps={rbps}, determining rseqiops...')
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rseqiops = round(run_fio(testfile, args.duration, 'read',
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args.seq_depth, 4096, args.numjobs) / 4096)
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info(f'\nrseqiops={rseqiops}, determining rrandiops...')
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rrandiops = round(run_fio(testfile, args.duration, 'randread',
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args.rand_depth, 4096, args.numjobs) / 4096)
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info(f'\nrrandiops={rrandiops}, determining wbps...')
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wbps = run_fio(testfile, args.duration, 'write',
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1, args.seqio_block_mb * (2 ** 20), args.numjobs)
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info(f'\nwbps={wbps}, determining wseqiops...')
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wseqiops = round(run_fio(testfile, args.duration, 'write',
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args.seq_depth, 4096, args.numjobs) / 4096)
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info(f'\nwseqiops={wseqiops}, determining wrandiops...')
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wrandiops = round(run_fio(testfile, args.duration, 'randwrite',
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args.rand_depth, 4096, args.numjobs) / 4096)
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info(f'\nwrandiops={wrandiops}')
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restore_elevator_nomerges()
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atexit.unregister(restore_elevator_nomerges)
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info('')
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print(f'{devno} rbps={rbps} rseqiops={rseqiops} rrandiops={rrandiops} '
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f'wbps={wbps} wseqiops={wseqiops} wrandiops={wrandiops}')
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