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https://github.com/nicolargo/glances.git
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Refactored glances.processes.GlancesProcesses.update
Part of #2801. Signed-off-by: Ariel Otilibili <otilibil@eurecom.fr>
This commit is contained in:
Ariel Otilibili
parent
e1cd3ded23
commit
1fda541350
@ -407,6 +407,136 @@ class GlancesProcesses:
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and not self.args.disable_cursor
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)
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def get_sorted_attrs(self):
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defaults = ['cpu_percent', 'cpu_times', 'memory_percent', 'name', 'status', 'num_threads']
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optional = ['io_counters'] if not self.disable_io_counters else []
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return defaults + optional
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def get_displayed_attr(self):
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defaults = ['memory_info', 'nice', 'pid']
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optional = ['gids'] if not self.disable_gids else []
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return defaults + optional
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def get_cached_attrs(self):
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return ['cmdline', 'username']
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def maybe_add_cached_attrs(self, sorted_attrs, cached_attrs):
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if self.cache_timer.finished():
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sorted_attrs += cached_attrs
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self.cache_timer.set(self.cache_timeout)
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self.cache_timer.reset()
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is_cached = False
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else:
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is_cached = True
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return (is_cached, sorted_attrs)
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def take_this_proc(self, p):
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conditions = [
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(BSD and p.info['name'] == 'idle'),
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(WINDOWS and p.info['name'] == 'System Idle Process'),
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(MACOS and p.info['name'] == 'kernel_task'),
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(self.no_kernel_threads and LINUX and p.info['gids'].real == 0),
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]
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return not any(conditions)
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def buils_proc_stats_lists(self, sorted_attrs):
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return list(
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filter(
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self.take_this_proc,
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psutil.process_iter(attrs=sorted_attrs, ad_value=None),
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)
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)
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def get_selected_proc(self, position, proc):
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# Get the selected process when the 'e' key is pressed
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if self.is_selected_extended_process(position):
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self.extended_process = proc
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# Grab extended stats only for the selected process (see issue #2225)
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if self.extended_process is not None and proc['pid'] == self.extended_process['pid']:
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proc.update(self.get_extended_stats(self.extended_process))
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self.extended_process = namedtuple_to_dict(proc)
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return proc
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def update_key_time_and_status(self, time_since_update, proc):
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# PID is the key
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proc['key'] = 'pid'
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# Time since last update (for disk_io rate computation)
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proc['time_since_update'] = time_since_update
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# Process status (only keep the first char)
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proc['status'] = str(proc['status'])[:1].upper()
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return proc
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def update_io_counters(self, proc):
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# procstat['io_counters'] is a list:
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# [read_bytes, write_bytes, read_bytes_old, write_bytes_old, io_tag]
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# If io_tag = 0 > Access denied or first time (display "?")
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# If io_tag = 1 > No access denied (display the IO rate)
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if 'io_counters' in proc and proc['io_counters'] is not None:
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io_new = [proc['io_counters'][2], proc['io_counters'][3]]
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# For IO rate computation
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# Append saved IO r/w bytes
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try:
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proc['io_counters'] = io_new + self.io_old[proc['pid']]
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io_tag = 1
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except KeyError:
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proc['io_counters'] = io_new + [0, 0]
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io_tag = 0
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# then save the IO r/w bytes
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self.io_old[proc['pid']] = io_new
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else:
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proc['io_counters'] = [0, 0] + [0, 0]
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io_tag = 0
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# Append the IO tag (for display)
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proc['io_counters'] += [io_tag]
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return proc
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def maybe_add_cached_stats(self, is_cached, cached_attrs, proc):
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if is_cached:
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# Grab cached values (in case of a new incoming process)
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if proc['pid'] not in self.processlist_cache:
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try:
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self.processlist_cache[proc['pid']] = psutil.Process(pid=proc['pid']).as_dict(
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attrs=cached_attrs, ad_value=None
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)
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except psutil.NoSuchProcess:
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pass
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# Add cached value to current stat
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try:
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proc.update(self.processlist_cache[proc['pid']])
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except KeyError:
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pass
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else:
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# Save values to cache
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try:
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self.processlist_cache[proc['pid']] = {cached: proc[cached] for cached in cached_attrs}
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except KeyError:
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pass
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return proc
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def maybe_remove_non_running_procs(self, processlist):
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pids_running = [p['pid'] for p in processlist]
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pids_cached = list(self.processlist_cache.keys()).copy()
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for pid in pids_cached:
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if pid not in pids_running:
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self.processlist_cache.pop(pid, None)
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def compute_max_of_keys(self, processlist):
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for k in self._max_values_list:
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values_list = [i[k] for i in processlist if i[k] is not None]
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if values_list:
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self.set_max_values(k, max(values_list))
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def update(self):
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"""Update the processes stats."""
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# Init new processes stats
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@ -420,45 +550,30 @@ class GlancesProcesses:
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time_since_update = getTimeSinceLastUpdate('process_disk')
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# Grab standard stats
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#####################
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sorted_attrs = ['cpu_percent', 'cpu_times', 'memory_percent', 'name', 'status', 'num_threads']
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displayed_attr = ['memory_info', 'nice', 'pid']
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sorted_attrs = self.get_sorted_attrs()
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# The following attributes are cached and only retrieve every self.cache_timeout seconds
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# Warning: 'name' can not be cached because it is used for filtering
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cached_attrs = ['cmdline', 'username']
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cached_attrs = self.get_cached_attrs()
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# Some stats are optional
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if not self.disable_io_counters:
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sorted_attrs.append('io_counters')
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if not self.disable_gids:
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displayed_attr.append('gids')
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# Some stats are not sort key
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# An optimisation can be done be only grabbed displayed_attr
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# for displayed processes (but only in standalone mode...)
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sorted_attrs.extend(displayed_attr)
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# Some stats are cached (not necessary to be refreshed every time)
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if self.cache_timer.finished():
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sorted_attrs += cached_attrs
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self.cache_timer.set(self.cache_timeout)
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self.cache_timer.reset()
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is_cached = False
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else:
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is_cached = True
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sorted_attrs.extend(self.get_displayed_attr())
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# Some stats are cached (not necessary to be refreshed every time)
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is_cached, sorted_attrs = self.maybe_add_cached_attrs(sorted_attrs, cached_attrs)
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# Build the processes stats list (it is why we need psutil>=5.3.0)
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# This is one of the main bottleneck of Glances (see flame graph)
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# It may be optimized with PsUtil 6+ (see issue #2755)
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processlist = self.buils_proc_stats_lists(sorted_attrs)
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# Build the processes stats list (it is why we need psutil>=5.3.0) (see issue #2755)
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processlist = list(
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filter(
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lambda p: not (BSD and p.info['name'] == 'idle')
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and not (WINDOWS and p.info['name'] == 'System Idle Process')
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and not (MACOS and p.info['name'] == 'kernel_task')
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and not (self.no_kernel_threads and LINUX and p.info['gids'].real == 0),
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psutil.process_iter(attrs=sorted_attrs, ad_value=None),
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)
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)
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# Only get the info key
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# PsUtil 6+ no longer check PID reused #2755 so use is_running in the loop
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# Note: not sure it is realy needed but CPU consumption look the same with or without it
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processlist = [p.info for p in processlist if p.is_running()]
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# Sort the processes list by the current sort_key
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processlist = sort_stats(processlist, sorted_by=self.sort_key, reverse=True)
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@ -472,78 +587,21 @@ class GlancesProcesses:
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# Extended stats
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################
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# Get the selected process when the 'e' key is pressed
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if self.is_selected_extended_process(position):
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self.extended_process = proc
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# Grab extended stats only for the selected process (see issue #2225)
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if self.extended_process is not None and proc['pid'] == self.extended_process['pid']:
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proc.update(self.get_extended_stats(self.extended_process))
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self.extended_process = namedtuple_to_dict(proc)
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# may update self.extended_process
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proc = self.get_selected_proc(position, proc)
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# Meta data
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###########
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# PID is the key
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proc['key'] = 'pid'
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# Time since last update (for disk_io rate computation)
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proc['time_since_update'] = time_since_update
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# Process status (only keep the first char)
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proc['status'] = str(proc['status'])[:1].upper()
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proc = self.update_key_time_and_status(time_since_update, proc)
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# Process IO
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# procstat['io_counters'] is a list:
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# [read_bytes, write_bytes, read_bytes_old, write_bytes_old, io_tag]
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# If io_tag = 0 > Access denied or first time (display "?")
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# If io_tag = 1 > No access denied (display the IO rate)
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if 'io_counters' in proc and proc['io_counters'] is not None:
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io_new = [proc['io_counters'][2], proc['io_counters'][3]]
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# For IO rate computation
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# Append saved IO r/w bytes
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try:
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proc['io_counters'] = io_new + self.io_old[proc['pid']]
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io_tag = 1
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except KeyError:
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proc['io_counters'] = io_new + [0, 0]
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io_tag = 0
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# then save the IO r/w bytes
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self.io_old[proc['pid']] = io_new
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else:
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proc['io_counters'] = [0, 0] + [0, 0]
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io_tag = 0
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# Append the IO tag (for display)
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proc['io_counters'] += [io_tag]
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proc = self.update_io_counters(proc)
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# Manage cached information
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if is_cached:
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# Grab cached values (in case of a new incoming process)
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if proc['pid'] not in self.processlist_cache:
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try:
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self.processlist_cache[proc['pid']] = psutil.Process(pid=proc['pid']).as_dict(
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attrs=cached_attrs, ad_value=None
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)
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except psutil.NoSuchProcess:
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pass
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# Add cached value to current stat
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try:
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proc.update(self.processlist_cache[proc['pid']])
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except KeyError:
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pass
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else:
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# Save values to cache
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try:
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self.processlist_cache[proc['pid']] = {cached: proc[cached] for cached in cached_attrs}
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except KeyError:
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pass
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proc = self.maybe_add_cached_stats(is_cached, cached_attrs, proc)
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# Remove non running process from the cache (avoid issue #2976)
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pids_running = [p['pid'] for p in processlist]
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pids_cached = list(self.processlist_cache.keys()).copy()
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for pid in pids_cached:
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if pid not in pids_running:
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self.processlist_cache.pop(pid, None)
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self.maybe_remove_non_running_procs(processlist)
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# Filter and transform process export list
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self.processlist_export = self.update_export_list(processlist)
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@ -553,10 +611,7 @@ class GlancesProcesses:
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# Compute the maximum value for keys in self._max_values_list: CPU, MEM
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# Useful to highlight the processes with maximum values
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for k in self._max_values_list:
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values_list = [i[k] for i in processlist if i[k] is not None]
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if values_list:
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self.set_max_values(k, max(values_list))
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self.compute_max_of_keys(processlist)
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# Update the stats
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self.processlist = processlist
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