cfg_checker/modules/ceph/bench.py

#    Author: Alex Savatieiev (osavatieiev@mirantis.com; a.savex@gmail.com)
#    Copyright 2019-2022 Mirantis, Inc.
import csv
import os
import json

from copy import deepcopy
from datetime import datetime, timedelta, timezone

from cfg_checker.common import logger_cli
from cfg_checker.common.decorators import retry
from cfg_checker.common.file_utils import write_str_to_file
from cfg_checker.helpers.console_utils import Progress
from cfg_checker.reports import reporter
# from cfg_checker.common.exception import InvalidReturnException
# from cfg_checker.common.exception import ConfigException
# from cfg_checker.common.exception import KubeException

from cfg_checker.nodes import KubeNodes
from cfg_checker.agent.fio_runner import _get_seconds, _datetime_fmt


_file_datetime_fmt = "%m%d%Y%H%M%S%z"


def _reformat_timestr(_str, _chars=["/", ",", " ", ":", "+"], _tchar=""):
    _new = ""
    for _c in _str:
        _new += _c if _c not in _chars else _tchar
    return _new


def _parse_json_output(buffer):
    try:
        return json.loads(buffer)
    except TypeError as e:
        logger_cli.error(
            "ERROR: Status not decoded: {}\n{}".format(e, buffer)
        )
    except json.decoder.JSONDecodeError as e:
        logger_cli.error(
            "ERROR: Status not decoded: {}\n{}".format(e, buffer)
        )
    return {}


def _split_vol_size(size):
    # I know, but it is faster then regex
    _numbers = [48, 49, 50, 51, 52, 53, 54, 55, 56, 57]
    _s_int = "0"
    _s_type = ""
    for ch in size:
        if ord(ch) in _numbers:
            _s_int += ch
        else:
            _s_type += ch
    return int(_s_int), _s_type


class CephBench(object):
    _agent_template = "cfgagent-template.yaml"

    def __init__(self, config):
        self.env_config = config
        return


class SaltCephBench(CephBench):
    def __init__(
        self,
        config
    ):
        logger_cli.error("ERROR: Not impelented for Salt environment!")

        # self.master = SaltNodes(config)
        super(SaltCephBench, self).__init__(config)
        return


class KubeCephBench(CephBench):
    def __init__(self, config):
        self.agent_count = config.bench_agent_count
        self.master = KubeNodes(config)
        super(KubeCephBench, self).__init__(config)

        self.mode = config.bench_mode
        self.resource_prefix = config.resource_prefix

        if config.bench_mode == "tasks":
            self.taskfile = config.bench_task_file
            self.load_tasks(self.taskfile)

        if config.bench_mode == "cleanup":
            self.cleanup_list = []
            return

        self.bench_name = config.bench_name
        self.results_dump_path = config.bench_results_dump_path
        self.results = {}
        self.agent_results = {}
        self.cleanup_list = []
        self.agent_pods = []

        if config.bench_mode == "report":
            self.results = {}
            return

        self.storage_class = config.bench_storage_class
        self.services = []
        # By default,
        # 30 seconds should be enough to send tasks to 3-5 agents
        self.scheduled_delay = 30

    def set_ceph_info_class(self, ceph_info):
        self.ceph_info = ceph_info

    def load_tasks(self, taskfile):
        # Load csv file
        logger_cli.info("-> Loading taskfile '{}'".format(taskfile))
        self.tasks = []
        with open(taskfile) as f:
            _reader = csv.reader(f, delimiter=',')
            # load packages
            for row in _reader:
                self.tasks.append({
                    "readwrite": row[0],
                    "rwmixread": row[1],
                    "bs": row[2],
                    "iodepth": row[3],
                    "size": row[4]
                })
        logger_cli.info("-> Loaded {} tasks".format(len(self.tasks)))

    def add_for_deletion(self, obj, typ):
        self.cleanup_list.append(
            [
                typ,
                obj.metadata.namespace,
                obj.metadata.name
            ]
        )
        return

    def prepare_cleanup(self):
        # Assume number of resources not given
        # list all svc, pod, pvc, pv and identify 'cfgagent-xx ones
        _types = ["pv", "pvc", "pod", "svc"]
        _prefix = self.resource_prefix
        for _typ in _types:
            _list = self.master.list_resource_names_by_type_and_ns(_typ)
            for ns, name in _list:
                if name.startswith(_prefix):
                    if ns:
                        _msg = "{} {}/{}".format(_typ, ns, name)
                    else:
                        _msg = "{} {}".format(_typ, name)
                    logger_cli.info("-> Found {}".format(_msg))
                    self.cleanup_list.append([_typ, ns, name])
        return

    def prepare_agents(self, options):
        logger_cli.info("# Preparing {} agents".format(self.agent_count))
        # Increase volume size a bit, so datafile fits
        _quanitizer = 1.3
        _v_size, _vol_size_units = _split_vol_size(options['size'])
        _v_size = round(_v_size * _quanitizer)
        _vol_size = str(_v_size) + _vol_size_units + "i"
        logger_cli.info(
            "-> Testfile size: {0}, Volume size: {1} ({0}*{2})".format(
                options['size'],
                _vol_size,
                _quanitizer
            )
        )
        # Start preparing
        for idx in range(self.agent_count):
            # create pvc/pv and pod
            logger_cli.info("-> creating agent '{:02}'".format(idx))
            # _agent, _pv, _pvc = self.master.prepare_benchmark_agent(
            _agent, _pvc = self.master.prepare_benchmark_agent(
                idx,
                os.path.split(options["filename"])[0],
                self.storage_class,
                _vol_size,
                self._agent_template
            )
            # save it to lists
            self.agent_pods.append(_agent)
            # self.add_for_deletion(_pv, "pv")
            self.add_for_deletion(_pvc, "pvc")
            self.add_for_deletion(_agent, "pod")

            # expose it
            _svc = self.master.expose_benchmark_agent(_agent)
            self.add_for_deletion(_svc, "svc")
            # Save service
            self.services.append(_svc)
            # prepopulate results
            self.agent_results[_agent.metadata.name] = {}
            self.agent_results[_agent.metadata.name]["url"] = \
                "http://{}:{}/api/".format(
                    _svc.spec.cluster_ip,
                    8765
                )
            self.agent_results[_agent.metadata.name]["storage_class"] = \
                self.storage_class
            self.agent_results[_agent.metadata.name]["volume_size"] = \
                options['size']

        logger_cli.info("-> Done creating agents")
        # TODO: Update after implementing pooled task sending
        self.scheduled_delay = self.agent_count * 10
        logger_cli.info(
            "-> Schedule delay set to {} sec".format(self.scheduled_delay)
        )
        return

    def _poke_agent(self, url, body, action="GET"):
        _datafile = "/tmp/data"
        _data = [
            "-d",
            "@" + _datafile
        ]
        _cmd = [
            "curl",
            "-s",
            "-H",
            "'Content-Type: application/json'",
            "-X",
            action,
            url
        ]
        if body:
            _cmd += _data
            _ret = self.master.prepare_json_in_pod(
                self.agent_pods[0].metadata.name,
                self.master._namespace,
                body,
                _datafile
            )
        _ret = self.master.exec_cmd_on_target_pod(
            self.agent_pods[0].metadata.name,
            self.master._namespace,
            " ".join(_cmd)
        )
        return _parse_json_output(_ret)

    def _ensure_agents_ready(self):
        # make sure agents idle
        _status_set = []
        _ready_set = []
        for _agent, _d in self.get_agents_status().items():
            # obviously, there should be some answer
            if _d is None:
                logger_cli.error("ERROR: Agent status not available")
                return False
            # status should be idle or finished
            if _d['status'] not in ["idle", "finished"]:
                logger_cli.error(
                    "Agent status invalid {}:{}".format(_agent, _d['status'])
                )
                _status_set += [False]
            else:
                # Good agent
                _status_set += [True]
            # agent's fio shell should be in 'ready'
            if not _d["healthcheck"]["ready"]:
                logger_cli.error("Agent is not ready {}".format(_agent))
                _ready_set += [False]
            else:
                # 'fio' shell for agent is ready
                _ready_set += [True]
        # all agent's statuses should be True
        # and all 'fio' shell modules should be 'ready'
        if not any(_status_set) or not any(_ready_set):
            # At least one is not ready and it was already logged above
            return False
        else:
            # All is good
            return True

    def get_agents_status(self):
        _status = {}
        _results = self.master.exec_on_labeled_pods_and_ns(
            "app=cfgagent",
            "curl -s http://localhost:8765/api/fio"
        )
        for _agent, _result in _results.items():
            _j = _parse_json_output(_result)
            _status[_agent] = _j
        return _status

    @retry(Exception, initial_wait=5)
    def get_agents_resultlist(self):
        _t = {"module": "fio", "action": "get_resultlist"}
        _status = {}
        for _agent, _d in self.agent_results.items():
            _status[_agent] = self._poke_agent(_d["url"], _t, action="POST")
        return _status

    @retry(Exception, initial_wait=5)
    def get_result_from_agent(self, agent, time):
        _t = {
            "module": "fio",
            "action": "get_result",
            "options": {
                "time": time
            }
        }
        return self._poke_agent(
            self.agent_results[agent]["url"],
            _t,
            action="POST"
        )

    def _get_next_scheduled_time(self):
        _now = datetime.now(timezone.utc)
        logger_cli.info("-> time is '{}'".format(_now.strftime(_datetime_fmt)))
        self.next_scheduled_time = _now + timedelta(
            seconds=self.scheduled_delay
        )
        _str_time = self.next_scheduled_time.strftime(_datetime_fmt)
        logger_cli.info(
            "-> next benchmark scheduled to '{}'".format(_str_time)
        )
        return _str_time

    def _send_scheduled_task(self, options):
        _task = {
            "module": "fio",
            "action": "do_scheduledrun",
            "options": options
        }
        for _agent, _d in self.agent_results.items():
            logger_cli.info(
                "-> sending task to '{}:{}'".format(_agent, _d["url"])
            )
            _ret = self._poke_agent(_d["url"], _task, action="POST")
            if 'error' in _ret:
                logger_cli.error(
                    "ERROR: Agent returned: '{}'".format(_ret['error'])
                )
                return False
        # No errors detected
        return True

    def track_benchmark(self, options):
        _runtime = _get_seconds(options["runtime"])
        _ramptime = _get_seconds(options["ramp_time"])
        # Sum up all timings that we must wait and double it
        _timeout = (self.scheduled_delay + _runtime + _ramptime) * 2
        # We should have no more than 65 measurements
        _stats_delay = round((_runtime + _ramptime) / 65)
        _start = self.next_scheduled_time
        _end = datetime.now(timezone.utc) + timedelta(seconds=_timeout)
        while True:
            # Print status
            _sts = self.get_agents_status()
            diff = (_end - datetime.now(timezone.utc)).total_seconds()
            logger_cli.info("-> {:.2f}s left. Agent status:".format(diff))
            for _agent, _status in _sts.items():
                logger_cli.info(
                    "\t{}: {} ({}%)".format(
                        _agent,
                        _status["status"],
                        _status["progress"]
                    )
                )
            # Get Ceph status if _start time passed
            _elapsed = (datetime.now(timezone.utc) - _start).total_seconds()
            if _elapsed > _stats_delay:
                logger_cli.info("-> {:.2f}s elapsed".format(_elapsed))
                _sec = "{:0.1f}".format(_elapsed)
                self.results[options["scheduled_to"]]["ceph"][_sec] = \
                    self.ceph_info.get_cluster_status()
            # Check if agents finished
            finished = [True for _s in _sts.values()
                        if _s["status"] == 'finished']
            _fcnt = len(finished)
            _tcnt = len(_sts)
            if _fcnt < _tcnt:
                logger_cli.info("-> {}/{} finished".format(_fcnt, _tcnt))
            else:
                logger_cli.info("-> All agents finished run")
                return True
            # recalc how much is left
            diff = (_end - datetime.now(timezone.utc)).total_seconds()
            # In case end_datetime was in past to begin with
            if diff < 0:
                logger_cli.info("-> Timed out waiting for agents to finish")
                return False

    def _do_testrun(self, options):
        self.results[options["scheduled_to"]]["osd_df_before"] = \
            self.ceph_info.get_ceph_osd_df()
        # send single to agent
        if not self._send_scheduled_task(options):
            return False
        # Track this benchmark progress
        if not self.track_benchmark(options):
            return False
        else:
            logger_cli.info("-> Finished testrun. Collecting results...")
            # get ceph osd stats
            self.results[options["scheduled_to"]]["osd_df_after"] = \
                self.ceph_info.get_ceph_osd_df()
            # Get results for each agent
            self.collect_results()
            logger_cli.info("-> Calculating totals and averages")
            self.calculate_totals()
            self.calculate_ceph_stats()
            self.osd_df_compare(options["scheduled_to"])
            logger_cli.info("-> Dumping results")
            for _time, _d in self.results.items():
                self.dump_result(
                    self._get_dump_filename(_time),
                    _d
                )
            return True

    def wait_ceph_cooldown(self):
        # TODO: Query Ceph ince a 20 sec to make sure its load dropped

        # get ceph idle status
        self.ceph_idle_status = self.ceph_info.get_cluster_status()
        self.health_detail = self.ceph_info.get_health_detail()
        self.ceph_df = self.ceph_info.get_ceph_df()
        self.ceph_pg_dump = self.ceph_info.get_ceph_pg_dump()
        return

    def run_benchmark(self, options):
        logger_cli.info("# Starting '{}' benchmark".format(self.mode))
        # Check agent readyness
        logger_cli.info("# Checking agents")
        if not self._ensure_agents_ready():
            return False

        # Make sure that Ceph is at low load
        # TODO: Ceph status check
        # self._wait_ceph_cooldown()

        # Do benchmark according to mode
        if self.mode == "tasks":
            logger_cli.info(
                "# Running benchmark with tasks from '{}'".format(
                    self.taskfile
                )
            )
            # take next task
            _total_tasks = len(self.tasks)
            for idx in range(_total_tasks):
                # init time to schedule
                _task = self.tasks[idx]
                _r = self.results
                logger_cli.info(
                    "-> Starting next task ({}/{})".format(idx+1, _total_tasks)
                )
                logger_cli.info("-> Updating options with: {}".format(
                        ", ".join(
                            ["{} = {}".format(k, v) for k, v in _task.items()]
                        )
                    )
                )
                # update options
                options.update(_task)
                # Check if such result already exists
                o = "input_options"
                _existing = filter(
                    lambda t:
                        _r[t]["id"] == idx and
                        _r[t]["mode"] == "tasks" and
                        _r[t][o]["readwrite"] == options["readwrite"] and
                        _r[t][o]["rwmixread"] == options["rwmixread"] and
                        _r[t][o]["bs"] == options["bs"] and
                        _r[t][o]["iodepth"] == options["iodepth"] and
                        _r[t][o]["size"] == options["size"],
                    _r
                )
                if len(list(_existing)) > 0:
                    logger_cli.info(
                        "-> Skipped already performed task from {}: "
                        "line {}, {}({}), {}, {}, {}".format(
                            self.taskfile,
                            idx,
                            options["readwrite"],
                            options["rwmixread"],
                            options["bs"],
                            options["iodepth"],
                            options["size"]
                        )
                    )
                    continue
                _sch_time = self._get_next_scheduled_time()
                options["scheduled_to"] = _sch_time
                # init results table
                _r[_sch_time] = {
                    "id": idx,
                    "mode": self.mode,
                    "input_options": deepcopy(options),
                    "agents": {},
                    "ceph": {}
                }
                # exit on error
                if not self._do_testrun(options):
                    return False
                # Save ceph osd stats and wait cooldown
                self.wait_ceph_cooldown()
        elif self.mode == "single":
            logger_cli.info("# Running single benchmark")
            # init time to schedule
            _sch_time = self._get_next_scheduled_time()
            options["scheduled_to"] = _sch_time
            # init results table
            self.results[_sch_time] = {
                "id": "{:2}".format(0),
                "input_options": options,
                "agents": {},
                "ceph": {}
            }
            if not self._do_testrun(options):
                return False
            # Save ceph osd stats
        else:
            logger_cli.error("ERROR: Unknown mode '{}'".format(self.mode))
            return False

        # Normal exit
        logger_cli.info("# All benchmark tasks done")
        return True

    def cleanup(self):
        logger_cli.info("# Cleaning up")
        self.cleanup_list.reverse()

        for _res in self.cleanup_list:
            self.master.cleanup_resource_by_name(_res[0], _res[2], ns=_res[1])

        # Wait for resource to be cleaned
        _timeout = 120
        _total = len(self.cleanup_list)
        logger_cli.info("-> Wait until {} resources cleaned".format(_total))
        _p = Progress(_total)
        while True:
            _g = self.master.get_resource_phase_by_name
            _l = [_g(r[0], r[2], ns=r[1]) for r in self.cleanup_list]
            _l = [item for item in _l if item]
            _idx = _total - len(_l)
            if len(_l) > 0:
                _p.write_progress(_idx)
            else:
                _p.write_progress(_idx)
                _p.end()
                logger_cli.info("# Done cleaning up")
                break
            if _timeout > 0:
                _timeout -= 1
            else:
                _p.end()
                logger_cli.info("# Timed out waiting after 120s.")
                break

        return

    def collect_results(self):
        logger_cli.info("# Collecting results")
        # query agents for results
        _agents = self.get_agents_resultlist()
        for _agent, _l in _agents.items():
            # Check if we already have this locally
            for _time in _l["resultlist"]:
                # There is a file already for this task/time
                # Check if we need to load it
                if _time not in self.results:
                    # Some older results found
                    # do not process them
                    logger_cli.info(
                        "-> Skipped old results for '{}'".format(_time)
                    )
                    continue
                elif _agent not in self.results[_time]["agents"]:
                    # Load result add it locally
                    logger_cli.info(
                        "-> Getting results for '{}' from '{}'".format(
                            _time,
                            _agent
                        )
                    )
                    _r = self.get_result_from_agent(_agent, _time)
                    self.results[_time]["agents"][_agent] = _r[_time]
                else:
                    # Should never happen, actually
                    logger_cli.info(
                        "-> Skipped loaded result for '{}' from '{}'".format(
                            _time,
                            _agent
                        )
                    )

    def _get_dump_filename(self, _time):
        _r = self.results[_time]
        _dirname = _r["input_options"]["name"]
        _filename = "-".join([
            _reformat_timestr(_time),
            "{:02}".format(len(_r["agents"])),
            _r["input_options"]["readwrite"],
            _r["input_options"]["bs"],
            str(_r["input_options"]["iodepth"]),
        ]) + ".json"
        return os.path.join(
            self.results_dump_path,
            _dirname,
            _filename
        )

    def preload_results(self):
        logger_cli.info(
            "# Preloading results for '{}'".format(self.bench_name)
        )
        # get all dirs in folder
        _p = self.results_dump_path
        if not os.path.isdir(_p):
            logger_cli.warn(
                "WARNING: Dump path is not a folder '{}'".format(_p)
            )
            return
        for path, dirs, files in os.walk(_p):
            if path == os.path.join(_p, self.bench_name):
                logger_cli.info("-> Folder found '{}'".format(path))
                for _fname in files:
                    logger_cli.debug("... processing '{}'".format(_fname))
                    _ext = _fname.split('.')[-1]
                    if _ext != "json":
                        logger_cli.info(
                            "-> Extension invalid '{}', "
                            "'json' is expected".format(_ext)
                        )
                        continue
                    # get time from filename
                    # Ugly, but works
                    _t = _fname.split('-')[0]
                    _str_time = _t[:14] + "+" + _t[14:]
                    _t = datetime.strptime(_str_time, _file_datetime_fmt)
                    _time = _t.strftime(_datetime_fmt)
                    self.results[_time] = self.load_dumped_result(
                        os.path.join(path, _fname)
                    )
                    logger_cli.info(
                        "-> Loaded '{}' as '{}'".format(
                            _fname,
                            _time
                        )
                    )

    def dump_result(self, filename, data):
        # Function dumps all available results as jsons to the given path
        # overwriting if needed
        _folder, _file = os.path.split(filename)
        # Do dump
        if not os.path.exists(_folder):
            os.mkdir(_folder)
            logger_cli.info("-> Created folder '{}'".format(_folder))
        # Dump agent data for this test run
        write_str_to_file(filename, json.dumps(data, indent=2))
        logger_cli.info("-> Dumped '{}'".format(filename))
        return

    def load_dumped_result(self, filename):
        try:
            with open(filename, "rt+") as f:
                return json.loads(f.read())
        except FileNotFoundError as e:
            logger_cli.error(
                "ERROR: {}".format(e)
            )
        except TypeError as e:
            logger_cli.error(
                "ERROR: Invalid file ({}): {}".format(filename, e)
            )
        except json.decoder.JSONDecodeError as e:
            logger_cli.error(
                "ERROR: Failed to decode json ({}): {}".format(filename, e)
            )
        return None

    def _lookup_storage_class_id_by_name(self, storage_class_name):
        # Assume that self had proper data
        for _pool in self.ceph_df["pools"]:
            if storage_class_name == _pool["name"]:
                return _pool["id"]
        return None

    def calculate_totals(self):
        # Calculate totals for Read and Write
        for _time, data in self.results.items():
            if "totals" not in data:
                data["totals"] = {}
            else:
                continue
            _totals = data["totals"]
            _r_bw = 0
            _r_avglat = []
            _r_95clat = []
            _r_iops = 0
            _w_bw = 0
            _w_avglat = []
            _w_95clat = []
            _w_iops = 0
            for _a, _d in data["agents"].items():
                # Hardcoded number of jobs param :(
                _j = _d["jobs"][0]
                _r_bw += _j["read"]["bw_bytes"]
                _r_avglat += [_j["read"]["lat_ns"]["mean"]]
                _r_95clat += [_j["read"]["clat_ns"]["percentile"]["95.000000"]]
                _r_iops += _j["read"]["iops"]
                _w_bw += _j["write"]["bw_bytes"]
                _w_avglat += [_j["write"]["lat_ns"]["mean"]]
                _w_95clat += \
                    [_j["write"]["clat_ns"]["percentile"]["95.000000"]]
                _w_iops += _j["write"]["iops"]
                # Save storage class name
                if "storage_class" not in _totals:
                    _totals["storage_class"] = \
                        self.agent_results[_a]["storage_class"]
                    # Lookup storage class id and num_pg
                    _totals["storage_class_stats"] = \
                        reporter.get_pool_stats_by_id(
                            self._lookup_storage_class_id_by_name(
                                self.agent_results[_a]["storage_class"]
                            ),
                            self.ceph_pg_dump
                        )

            _totals["read_bw_bytes"] = _r_bw
            _totals["read_avg_lat_us"] = \
                (sum(_r_avglat) / len(_r_avglat)) / 1000
            _totals["read_95p_clat_us"] = \
                (sum(_r_95clat) / len(_r_95clat)) / 1000
            _totals["read_iops"] = _r_iops
            _totals["write_bw_bytes"] = _w_bw
            _totals["write_avg_lat_us"] = \
                (sum(_w_avglat) / len(_w_avglat)) / 1000
            _totals["write_95p_clat_us"] = \
                (sum(_w_95clat) / len(_w_95clat)) / 1000
            _totals["write_iops"] = _w_iops

    def calculate_ceph_stats(self):
        # func to get values as lists
        def _get_max_value(key, stats):
            _max_time = 0
            _value = 0
            for _k, _v in stats.items():
                if key in _v and _value < _v[key]:
                    _max_time = _k
                    _value = _v[key]
            return _max_time, _value

        def _perc(n, m):
            if not n:
                return 0
            elif not m:
                return 0
            else:
                return "{:.0f}%".format((n / m) * 100)

        def _axis_vals(val):
            return [
                val, int(val*1.1), int(val*0.75), int(val*0.50), int(val*0.15)
            ]

        _stats = {}
        for _time, data in self.results.items():
            if "ceph" not in data:
                logger_cli.warning(
                    "WARNING: Ceph stats raw data not found in results"
                )
                continue
            if "ceph_stats" not in data:
                data["ceph_stats"] = {}
            else:
                continue
            # Copy pool stats data
            for _e, _d in data["ceph"].items():
                _stats[_e] = _d["pgmap"]
            # Maximums
            mrb_t, mrb = _get_max_value("read_bytes_sec", _stats)
            mwb_t, mwb = _get_max_value("write_bytes_sec", _stats)
            mri_t, mri = _get_max_value("read_op_per_sec", _stats)
            mwi_t, mwi = _get_max_value("write_op_per_sec", _stats)
            # Replace ceph with shorter data
            data["ceph"] = {
                "max_rbl": _axis_vals(mrb),
                "max_rbl_time": mrb_t,
                "max_wbl": _axis_vals(mwb),
                "max_wbl_time": mwb_t,
                "max_ril": _axis_vals(mri),
                "max_ril_time": mri_t,
                "max_wil": _axis_vals(mwi),
                "max_wil_time": mwi_t,
                "stats": _stats
            }
            # Calculate %% values for barchart
            for _e, _d in data["ceph"]["stats"].items():
                _d["read_bytes_sec_perc"] = \
                    _perc(_d.get("read_bytes_sec", 0), mrb)
                _d["write_bytes_sec_perc"] = \
                    _perc(_d.get("write_bytes_sec", 0), mwb)
                _d["read_op_per_sec_perc"] = \
                    _perc(_d.get("read_op_per_sec", 0), mri)
                _d["write_op_per_sec_perc"] = \
                    _perc(_d.get("write_op_per_sec", 0), mwi)
        return

    def osd_df_compare(self, _time):
        def _get_osd(osd_id, nodes):
            for osd in nodes:
                if osd["id"] == osd_id:
                    return osd
            return None

        logger_cli.info("# Comparing OSD stats")
        _osd = {}
        if _time not in self.results:
            logger_cli.warning("WARNING: {} not found in results. Check data")
            return
        data = self.results[_time]
        # Save summary
        data["osd_summary"] = {}
        data["osd_summary"]["before"] = data["osd_df_before"]["summary"]
        data["osd_summary"]["after"] = data["osd_df_after"]["summary"]
        data["osd_summary"]["active"] = {
            "status": "",
            "device_class": "",
            "pgs": "",
            "kb_used": 0,
            "kb_used_data": 0,
            "kb_used_omap": 0,
            "kb_used_meta": 0,
            "utilization": 0,
            "var_down": 0,
            "var_up": 0
        }
        # Compare OSD counts
        osds_before = len(data["osd_df_before"]["nodes"])
        osds_after = len(data["osd_df_after"]["nodes"])
        if osds_before != osds_after:
            logger_cli.warning(
                "WARNING: Before/After bench OSD "
                "count mismatch for '{}'".format(_time)
            )
        # iterate osds from before
        _pgs = 0
        _classes = set()
        _nodes_up = 0
        for idx in range(osds_before):
            _osd_b = data["osd_df_before"]["nodes"][idx]
            # search for the same osd in after
            _osd_a = _get_osd(_osd_b["id"], data["osd_df_after"]["nodes"])
            # Save data to the new place
            _osd[_osd_b["name"]] = {}
            _osd[_osd_b["name"]]["before"] = _osd_b
            if not _osd_a:
                # If this happen, Ceph cluster is actually broken
                logger_cli.warning(
                    "WARNING: Wow! {} dissapered".format(_osd_b["name"])
                )
                _osd[_osd_b["name"]]["after"] = {}
            else:
                _osd[_osd_b["name"]]["after"] = _osd_a
            _osd[_osd_b["name"]]["percent"] = {}
            # Calculate summary using "after" data
            _pgs += _osd_a["pgs"]
            _classes.update([_osd_a["device_class"]])
            if _osd_a["status"] == "up":
                _nodes_up += 1
            # compare
            _keys_b = list(_osd_b.keys())
            _keys_a = list(_osd_a.keys())
            _nodes_up
            # To be safe, detect if some keys are different
            # ...and log it.
            _diff = set(_keys_b).symmetric_difference(_keys_a)
            if len(_diff) > 0:
                # This should never happen, actually
                logger_cli.warning(
                    "WARNING: Before/after keys mismatch "
                    "for OSD node {}: {}".format(idx, ", ".join(_diff))
                )
                continue
            # Compare each key and calculate how it changed
            for k in _keys_b:
                if _osd_b[k] != _osd_a[k]:
                    # Announce change
                    logger_cli.debug(
                        "-> {:4}: {}, {} -> {}".format(
                            idx,
                            k,
                            _osd_b[k],
                            _osd_a[k]
                        )
                    )
                    # calculate percent
                    _change_perc = (_osd_a[k] / _osd_b[k]) * 100 - 100
                    _osd[_osd_b["name"]]["percent"][k] = _change_perc

                    # Increase counters
                    _p = data["osd_summary"]["active"]

                    if k not in _p:
                        _p[k] = 1
                    else:
                        _p[k] += 1
                    if k == "var":
                        if _change_perc > 0:
                            _p["var_up"] += 1
                        elif _change_perc < 0:
                            _p["var_down"] += 1
        # Save sorted data
        data["osds"] = _osd
        logger_cli.info("-> Removing redundand osd before/after data")
        data.pop("osd_df_before")
        data.pop("osd_df_after")
        # Save summary
        data["osd_summary"]["active"]["status"] = "{}".format(_nodes_up)
        data["osd_summary"]["active"]["device_class"] = \
            "{}".format(len(list(_classes)))
        data["osd_summary"]["active"]["pgs"] = _pgs
        return

    # Create report
    def create_report(self, filename):
        """
        Create static html showing ceph info report

        :return: none
        """
        logger_cli.info("### Generating report to '{}'".format(filename))
        _report = reporter.ReportToFile(
            reporter.HTMLCephBench(self),
            filename
        )
        _report(
            {
                "results": self.results,
                "idle_status": self.ceph_idle_status,
                "health_detail": self.health_detail,
                "ceph_df": self.ceph_df,
                "ceph_pg_dump": self.ceph_pg_dump,
                "info": self.ceph_info.ceph_info,
                "cluster": self.ceph_info.cluster_info,
                "ceph_version": self.ceph_info.ceph_version,
                "nodes": self.agent_pods
            }
        )
        logger_cli.info("-> Done")

        return