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How to use set_tunable method in autotest

Best Python code snippet using autotest_python

ec2_instance_cfg_engine.py

Source:ec2_instance_cfg_engine.py

...121        log_file.write(json_log)122        log_file.close()123        self.log_object = None124        return125    def set_tunable(self, tunable, cmd,126                    get_tunable, log_index,127                    new_value, orig_value):128        '''129        Core function that actually does the job of setting tunable.130        orig_value will be passed only during recovery phase. orig_value131        param will be NULL during system configuration phase.132        '''133        # This is the action of current function invocation134        action = "{0} = {1}".format(tunable, new_value)135        # Fetch current tunable value in the system136        try:137            current_value = get_tunable(tunable)138        except Ec2AutotuneError, e:139            syslog(e.msg)140            return141        '''142        Current value is different from expected original value, then143        this tunable is being tweaked by system user and should be left144        untouched.145        '''146        if (orig_value is not None and orig_value != current_value):147            return148        # If new value to be set is same as current value, nothing to set149        if (new_value == current_value):150            return151        try:152            # Set new value & log the new value for recovery153            exec_cmds(cmd)154            syslog("set {0}".format(action))155            if (self.recovery_instance is False and current_value is not None):156                assert(orig_value is None)157                # Configuring system: log system changes158                tmp_log_object = {"Name": tunable,159                                  "Original": current_value,160                                  "Changed": new_value}161                self.log_object[log_index].append(tmp_log_object)162        except Ec2AutotuneError, e:163            syslog(e.msg)164        return165    def safe_set_tunable(self, tunable, data,166                         get_tunable, log_index,167                         new_value, orig_value):168        '''169        This function has the same functionality as set_tunable.170        This version uses python's internal write library call171        to set the tunable instead of forking to shell. We should172        deprecate calling set_tunable as much as possible in future173        to avoid forking to shell.174        '''175        '''176        Core function that actually does the job of setting tunable.177        orig_value will be passed only during recovery phase. orig_value178        param will be NULL during system configuration phase.179        '''180        # This is the action of current function invocation181        action = "{0} = {1}".format(tunable, new_value)182        # Fetch current tunable value in the system183        try:184            current_value = get_tunable(tunable)185        except Ec2AutotuneError, e:186            syslog(e.msg)187            return188        '''189        Current value is different from expected original value, then190        this tunable is being tweaked by system user and should be left191        untouched.192        '''193        if (orig_value is not None and orig_value != current_value):194            return195        # If new value to be set is same as current value, nothing to set196        if (new_value == current_value):197            return198        try:199            # Set new value & log the new value for recovery200            write_sysfs_file(tunable, data)201            syslog("set {0}".format(action))202            if (self.recovery_instance is False and current_value is not None):203                assert(orig_value is None)204                # Configuring system: log system changes205                tmp_log_object = {"Name": tunable,206                                  "Original": current_value,207                                  "Changed": new_value}208                self.log_object[log_index].append(tmp_log_object)209        except Ec2AutotuneError, e:210            syslog(e.msg)211        return212    def parse_tunable_output(self, output):213        '''214        Tunables values are in four formats (for tunables we are215        working):216        1: number217        2: [foo] bar218        3: foo219        4: number1\tnumber2\tnumber2220        Second format above is tricky as the value set is the one enclosed221        within []. In cases like these, we need to extract the string222        enclosed between [] and return it to caller.223        For all format, convert the output into a list and return224        '''225        if (output is None or len(output) == 0):226            return None227        output = output.strip()228        start = output.find("[")229        if (start != -1):230            end = output.find("]")231            if (end == -1):  # Should never happen232                raise Ec2AutotuneError(233                        "Parsing error of {0}".format(output))234            output = output[start+1:end]235        output = output.split()236        if (output[0].isdigit() is True):237            output = map(int, output)238        return output239    def convert_input_value(self, value):240        '''241        value will be a list, return string representation242        '''243        if (isinstance(value, list) is False):244            raise Ec2AutotuneError(245                     "input value is in an invalid format.")246        length = len(value)247        value = " ".join(map(str, value))248        # Embed multiple values inside strings249        if (length > 1):250            value = "\"{0}\"".format(value)251        return value252    def get_service_state(self, service):253        '''254        Returns the current status of service in the system255        '''256        try:257            output = get_piped_cmd_output(258                    "/bin/systemctl status {0}".format(service),259                    "/bin/grep Active:")260            if ("running" in output):261                return (["start"])262            elif ("dead" in output):263                return (["stop"])264            else:265                raise Ec2AutotuneError(266                        "{0} package not installed.".format(service))267        except Ec2AutotuneError, e:268            raise e269    def set_service_state(self, service, new_state, orig_state=None):270        '''271        Set the passed in service state.272        '''273        try:274            tmp_new_state = self.convert_input_value(new_state)275        except Ec2AutotuneError, e:276            syslog("Failed to set {0} = {1}".format(service, e.msg))277            return278        cmd = ["/bin/systemctl {0} {1}".format(tmp_new_state, service)]279        return self.set_tunable(service, cmd,280                                self.get_service_state, SERVICE,281                                new_state, orig_state)282    def get_sysctl_value(self, sysctl_setting):283        '''284        Get value of a particular kernel setting285        '''286        try:287            output = get_cmd_output("/sbin/sysctl {0}".format(sysctl_setting))288            if (len(output) == 0):289                return None290            output = output.split("=")[1]291            return self.parse_tunable_output(output)292        except Ec2AutotuneError, e:293            raise e294    def set_sysctl_value(self, sysctl_setting, new_value, orig_value=None):295        '''296        Set value of a particular kernel setting.297        '''298        # If the value to be configured is also being modified as part of299        # /etc/sysctl.d/*.conf, then this is a conflict.300        for ln in self.sysctl_conf:301            if (sysctl_setting in ln):302                syslog("Skipping {0} as it conflicts with "303                       "/etc/sysctl.d framework.".format(sysctl_setting))304                return305        try:306            tmp_new_value = self.convert_input_value(new_value)307        except Ec2AutotuneError, e:308            syslog("Failed to set {0} = {1}".format(sysctl_setting, e.msg))309            return310        cmd = ["/sbin/sysctl -q -w {0}={1}".format(sysctl_setting,311                                                   tmp_new_value)]312        return self.set_tunable(sysctl_setting, cmd,313                                self.get_sysctl_value, SYSCTL,314                                new_value, orig_value)315    def get_sysfs_value(self, sysfs_file):316        '''317        Get value of a particular sysfs setting318        '''319        try:320            output = read_sysfs_file(sysfs_file)321            if (len(output) == 0):322                return None323            return self.parse_tunable_output(output)324        except Ec2AutotuneError, e:325            raise e326    def set_sysfs_value(self, sysfs_file, new_value, orig_value=None):327        '''328        Set value of a particular sysfs setting.329        orig_value will be passed only during recovery phase. orig_value330        param will be NULL during system configuring phase.331        '''332        if (os.path.isfile(sysfs_file) is False):333            syslog("invalid sysfs_file={0}".format(sysfs_file))334            return335        try:336            tmp_new_value = self.convert_input_value(new_value)337        except Ec2AutotuneError, e:338            syslog("Failed to set {0} = {1}".format(sysfs_file, e.msg))339            return340        return self.safe_set_tunable(sysfs_file, tmp_new_value,341                                     self.get_sysfs_value, SYSFS,342                                     new_value, orig_value)343    def get_cpu_value(self, cpu_state):344        '''345        Get value of a particular CPU state346        '''347        try:348            retcode = 0349            output = None350            # Query frequency governor351            if (cpu_state == "p-state"):352                # Work only with intel_pstate driver353                driver = get_piped_cmd_output(354                             "/bin/cpupower frequency-info --driver",355                             "/bin/grep \"driver: intel_pstate\"")356                if(len(driver) > 0):357                    # Return current governor being used358                    output = get_piped_cmd_output(359                                 "/bin/cpupower frequency-info",360                                 "/bin/grep \"The governor\"")361                    start = output.find("\"")362                    if (start == -1):363                        raise Ec2AutotuneError(364                                    "Parsing error of current "365                                    "frequency-info governor")366                    end = output.find("\"", start+1)367                    if (end == -1):368                        raise Ec2AutotuneError(369                                    "Parsing error of current "370                                    "frequency-info governor")371                    return ([output[start+1:end]])372            # Query CPU idle state373            elif (cpu_state == "c-state"):374                # Work only with intel_idle driver375                driver = get_piped_cmd_output(376                             "/bin/cpupower idle-info --silent",377                             "/bin/grep \"driver: intel_idle\"")378                if(len(driver) > 0):379                    # Number of idle states380                    output = get_piped_cmd_output(381                                 "/bin/cpupower idle-info",382                                 "/bin/grep \"Number of idle states:\"")383                    max_states = int(output[(output.index("states: ") + 8):])384                    # Available idle states385                    idle_states = []386                    output = get_piped_cmd_output(387                                 "/bin/cpupower idle-info",388                                 "/bin/grep \"Available idle states:\"")389                    beg = 0390                    end = len(output)391                    for state in range(max_states):392                        try:393                            idx = output.rindex(" ", beg, end) + 1394                        except:395                            raise Ec2AutotuneError(396                                      "Parsing error of available idle states")397                        if (idx == -1):398                            raise Ec2AutotuneError(399                                    "Parsing error of available idle states")400                        idle_states.append(output[idx:end])401                        end = idx - 1402                    idle_states.reverse()403                    # Return deepest enabled state404                    output = get_piped_cmd_output(405                                "/bin/cpupower idle-info",406                                "/bin/grep DISABLED")407                    if (len(output) == 0):408                        # No state is disabled, return deepest state409                        return ([idle_states[max_states - 1]])410                    else:411                        index = output.index(" ")412                        output = output[:index]413                        return ([idle_states[idle_states.index(output) - 1]])414            else:415                # State should always be either p-state or c-state416                raise Ec2AutotuneError(417                    "Invalid {0} state".format(cpu_state))418        except Ec2AutotuneError, e:419            raise e420    def set_cpu_value(self, cpu_state, new_value, orig_value=None):421        '''422        Set value of a particular CPU state.423        orig_value will be passed only during recovery phase. orig_value424        param will be NULL during system configuring phase.425        We set this only on systems which has intel drivers (no acpi driver).426        '''427        try:428            tmp_new_value = self.convert_input_value(new_value)429        except Ec2AutotuneError, e:430            syslog("Failed to set {0} = {1}".format(cpu_state, e.msg))431            return432        if (cpu_state == "p-state"):433            '''434            P-state: value has to be one of the supported governors435            by intel_pstate driver.436            '''437            cmd = ["/bin/cpupower frequency-set -g {0}".format(tmp_new_value)]438        elif (cpu_state == "c-state"):439            '''440            C-state: value has to be one of the supported idle441            states by intel_idle driver442            '''443            idle_states = {  # state : latency444                            "POLL": 0,445                            "C1": 2,446                            "C1E": 10,447                            "C3": 40,448                            "C6": 133}449            if (not(tmp_new_value in idle_states)):450                raise Ec2AutotuneError(451                            "Invalid value for c-state = "452                            "{0}".format(tmp_new_value))453            cmd = (["/bin/cpupower idle-set --enable-all",454                   "/bin/cpupower idle-set --disable-by-latency {0}"455                    .format(str(idle_states[tmp_new_value] + 1))])456        else:457            raise Ec2AutotuneError(458                        "Invalid CPU state {0}".format(cpu_state))459        return self.set_tunable(cpu_state, cmd,460                                self.get_cpu_value, CPU,461                                new_value, orig_value)462    def configure_system(self, section, configure, dry_run=False):463        if (dry_run is True):464            fetch_configuration(self.auto_profile,465                                self.user_profile,466                                section,467                                None,468                                None,469                                None,470                                configure)471        else:472            fetch_configuration(self.auto_profile,473                                self.user_profile,...

fsdev_disks.py

Source:fsdev_disks.py

...397        """398        for dx in range(len(disks)):399            disk = disks[dx]['tunable']400            # Set the scheduler first before setting any other tunables401            self.set_tunable(disk, "scheduler",402                                   self.tune_loc["scheduler"],403                                   "cfq")404            # Now set all the tunable parameters we've been given405            for tune_desc in self.tune_list:406                self.set_tunable(disk, tune_desc[0],407                                 tune_desc[1],408                                 tune_desc[2])409    def set_tunable(self, disk, name, path, val):410        """411        Given a disk name, a path to a tunable value under _TUNE_PATH and the412        new value for the parameter, set the value and verify that the value413        has been successfully set.414        """415        fpath = partition.get_iosched_path(disk, path)416        # Things might go wrong so we'll catch exceptions417        try:418            step = "open tunable path"419            tunef = open(fpath, 'w', buffering=-1)420            step = "write new tunable value"421            tunef.write(val)422            step = "close the tunable path"423            tunef.close()424            step = "read back new tunable value"425            nval = open(fpath, 'r', buffering=-1).read().strip()426            # For 'scheduler' we need to fish out the bracketed value427            if name == "scheduler":428                nval = re.match(".*\[(.*)\].*", nval).group(1)429        except IOError, info:430            # Special case: for some reason 'max_sectors_kb' often doesn't work431            # with large values; try '128' if we haven't tried it already.432            if name == "max_sectors_kb" and info.errno == 22 and val != '128':433                self.set_tunable(disk, name, path, '128')434                return435            # Something went wrong, probably a 'config' problem of some kind436            raise Exception("Unable to set tunable value '" + name +437                            "' at step '" + step + "': " + str(info))438        except Exception:439            # We should only ever see 'IOError' above, but just in case ...440            raise Exception("Unable to set tunable value for " + name)441        # Make sure the new value is what we expected442        if nval != val:443            raise Exception("Unable to correctly set tunable value for " +444                            name + ": desired " + val + ", but found " + nval)...

base.py

Source:base.py

1"""2Base methods for the tunable tools3"""4# pylint: disable=C0303,C03305__all__ = [6    "sample",7]8import operator9import random10from functools import reduce11from itertools import product12from tabulate import tabulate13from ..finalize import finalize14class Sampler:15    "Base class for sampling values of a tunable object"16    def __init__(17        self,18        tunable,19        variables=None,20        n_samples=None,21        callback=None,22        callback_calls=False,23        label=None,24        **kwargs,25    ):26        "Initializes the tunable object and the variables"27        self.tunable = finalize(tunable).copy()28        self.compute_kwargs = kwargs29        if callback:30            self.callback = callback31        self.callback_calls = callback_calls32        if label:33            self.label = label34        if variables:35            self.variables = tuple(36                str(tunable.get_variable(var).key) for var in variables37            )38            set_vars = set(self.variables)39            set_tunable = set(self.tunable.tunable_variables)40            if not set_vars <= set_tunable:41                raise ValueError(42                    f"Variable(s) {set_vars-set_tunable} have been fixed and cannot be tuned"43                )44            # Fixes the tunable variable not involved45            for var in set_tunable.difference(set_vars):46                self.tunable.fix(var)47        else:48            self.variables = self.tunable.tunable_variables49        if n_samples:50            self.n_samples = n_samples51    @property52    def max_samples(self):53        "Size of the parameter space (product of variables' size)"54        lens = tuple(self.tunable[var].size for var in self.variables)55        return reduce(operator.mul, lens)56    @property57    def n_samples(self):58        "Number of samples"59        return getattr(self, "_n_samples", self.max_samples)60    @n_samples.setter61    def n_samples(self, value):62        if not (isinstance(value, int) and value > 0):63            raise ValueError("n_samples must be a positive integer")64        self._n_samples = min(value, self.max_samples)65    def __len__(self):66        self.n_samples67    @property68    def samples(self):69        "Samples of the parameters space"70        iters = tuple(self.tunable[var].values for var in self.variables)71        values = product(*iters)72        if self.n_samples >= self.max_samples:73            return tuple(values)74        idxs = sorted(random.sample(range(self.max_samples), self.n_samples))75        return tuple(76            val for idx, val in filter(lambda _: _[0] in idxs, enumerate(values))77        )78    def sample_values(self):79        "Returns the sampled values"80        return list(self)81    @property82    def callback(self):83        return getattr(self, "_callback", lambda _: _)84    @callback.setter85    def callback(self, value):86        "Function to be called on the result"87        if not callable(value):88            raise TypeError("callback must be a callable")89        self._callback = value90    def __iter__(self):91        for params in self.samples:92            tmp = self.tunable.copy()93            for var, val in zip(self.variables, params):94                tmp.fix(var, val)95            try:96                if self.callback_calls:97                    result = self.callback(lambda: tmp.compute(**self.compute_kwargs))98                else:99                    result = self.callback(tmp.compute(**self.compute_kwargs))100            except Exception as err:101                result = err102            yield params, result103    @property104    def label(self):105        "Label used for the result"106        return getattr(self, "_label", self.tunable.label)107    @label.setter108    def label(self, value):109        self._label = str(value)110    @property111    def headers(self):112        "Headers for the values returned by the sampler"113        return tuple(self.tunable[var].label for var in self.variables) + (self.label,)114    def tabulate(self, **kwargs):115        "Returns a table of the values"116        kwargs.setdefault("headers", self.headers)117        return tabulate((params + (repr(result),) for params, result in self), **kwargs)118    def _repr_html_(self):119        return self.tabulate(tablefmt="html")120def sample(tunable, *variables, samples=100, **kwargs):121    """122    Samples the value of the tunable object123    Parameters124    ----------125    variables: list of str126        Set of variables to sample.127    samples: int128        The number of samples to run. If None, all the combinations are sampled.129    kwargs: dict130        Variables passed to the compute function. See help(tunable.compute)131    """...

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