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# -*- coding: utf-8 -*-
#
# Copyright 2015 Red Hat, Inc.
# All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
"""
Benchmark Memory functions.
"""
import re
import subprocess
import sys
from hardware.benchmark import utils
def get_available_memory():
"""Return the total amount of available memory, in bytes."""
with open('/proc/meminfo', 'r') as meminfo:
for line in meminfo:
if line.startswith('MemFree:'):
return int(line.split()[1]) * 1024
return -1
def check_mem_size(block_size, cpu_count):
"""Check if a test can run with a given block size and cpu count."""
dsplit = re.compile(r'\d+')
ssplit = re.compile(r'[A-Z]+')
unit = ssplit.findall(block_size)
unit_in_bytes = 1
if unit[0] == 'K':
unit_in_bytes = 1024
elif unit[0] == 'M':
unit_in_bytes = 1024 * 1024
elif unit[0] == 'G':
unit_in_bytes = 1024 * 1024 * 1024
size_in_bytes = (unit_in_bytes * int(dsplit.findall(block_size)[0])
* cpu_count)
if size_in_bytes > get_available_memory():
return False
return True
def run_sysbench_memory_threaded(hw_lst, max_time, block_size, cpu_count,
processor_num=None):
"""Running memtest on a processor."""
check_mem = check_mem_size(block_size, cpu_count)
taskset = ''
if processor_num is not None:
if check_mem is False:
msg = ("Avoid Benchmarking memory @%s "
"from CPU %d, not enough memory\n")
sys.stderr.write(msg % (block_size, processor_num))
return
sys.stderr.write('Benchmarking memory @%s from CPU %d'
' for %d seconds (%d threads)\n' %
(block_size, processor_num, max_time, cpu_count))
taskset = 'taskset %s' % hex(1 << processor_num)
else:
if check_mem is False:
msg = ("Avoid Benchmarking memory @%s "
"from all CPUs, not enough memory\n")
sys.stderr.write(msg % block_size)
return
sys.stderr.write('Benchmarking memory @%s from all CPUs '
'for %d seconds (%d threads)\n'
% (block_size, max_time, cpu_count))
_cmd = ('%s sysbench --max-time=%d --max-requests=100000000 '
'--num-threads=%d --test=memory --memory-block-size=%s run')
sysbench_cmd = subprocess.Popen(_cmd % (taskset, max_time,
cpu_count, block_size),
shell=True, stdout=subprocess.PIPE)
for line in sysbench_cmd.stdout:
line = line.decode()
if "transferred" in line:
_, right = line.rstrip('\n').replace(' ', '').split('(')
perf, _ = right.split('.')
if processor_num is not None:
hw_lst.append(('cpu',
'logical_%d' % processor_num,
'bandwidth_%s' % block_size,
perf))
else:
hw_lst.append(('cpu', 'logical',
'threaded_bandwidth_%s' % block_size,
perf))
def run_sysbench_memory_forked(hw_lst, max_time, block_size, cpu_count):
"""Running forked memtest on a processor."""
if check_mem_size(block_size, cpu_count) is False:
cmd = ('Avoid benchmarking memory @%s from all'
' CPUs (%d forked processes), not enough memory\n')
sys.stderr.write(cmd % (block_size, cpu_count))
return
sys.stderr.write('Benchmarking memory @%s from all CPUs'
' for %d seconds (%d forked processes)\n'
% (block_size, max_time, cpu_count))
sysbench_cmd = '('
for _ in range(cpu_count):
_cmd = ('sysbench --max-time=%d --max-requests=100000000 '
'--num-threads=1 --test=memory --memory-block-size=%s run &')
sysbench_cmd += _cmd % (max_time, block_size)
sysbench_cmd.rstrip('&')
sysbench_cmd += ')'
global_perf = 0
process = subprocess.Popen(
sysbench_cmd, shell=True, stdout=subprocess.PIPE)
for line in process.stdout:
line = line.decode()
if "transferred" in line:
_, right = line.rstrip('\n').replace(' ', '').split('(')
perf, _ = right.split('.')
global_perf += int(perf)
hw_lst.append(('cpu', 'logical', 'forked_bandwidth_%s' %
(block_size), str(global_perf)))
def mem_perf(hw_lst, max_time=5):
"""Report the memory performance."""
all_cpu_testing_time = 5
block_size_list = ['1K', '4K', '1M', '16M', '128M', '1G', '2G']
logical = utils.get_value(hw_lst, 'cpu', 'logical', 'number')
physical = utils.get_value(hw_lst, 'cpu', 'physical', 'number')
if physical:
eta = int(physical) * len(block_size_list) * max_time
eta += 2 * (all_cpu_testing_time * len(block_size_list))
sys.stderr.write('Memory Performance: %d logical CPU'
' to test (ETA: %d seconds)\n'
% (int(physical), int(eta)))
for cpu_nb in utils.get_one_cpu_per_socket(hw_lst):
for block_size in block_size_list:
run_sysbench_memory_threaded(hw_lst, max_time,
block_size, 1, cpu_nb)
# There is not need to test fork vs thread
# if only a single logical cpu is present
if int(logical) > 1:
for block_size in block_size_list:
run_sysbench_memory_threaded(hw_lst, all_cpu_testing_time,
block_size, int(logical))
for block_size in block_size_list:
run_sysbench_memory_forked(hw_lst, all_cpu_testing_time,
block_size, int(logical))
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