First optimzation with a new dynamic way to compute the refresh rate. Good news, the CPU consumption seams to be lower than ~20% with a refresh rate more or less the same...

Author: nicolargo

conf/glances.conf

@@ -3,6 +3,10 @@
 ##############################################################################
 
 [global]
+# Refresh rate (default is a minimum of 2 seconds)
+# Can be overwrite by the -t <sec> option
+# It is also possible to overwrite it in each plugin sections
+refresh=2
 # Does Glances should check if a newer version is available on PyPI ?
 check_update=false
 # History size (maximum number of values)
@@ -27,6 +31,8 @@ max_processes_display=30
 # Set to true to disable a plugin
 # Note: you can also disable it from the command line (see --disable-plugin <plugin_name>)
 disable=False
+# Set a specific refresh rate for this plugin by overwriting the default/refresh value
+#refresh=3
 # Graphical percentage char used in the terminal user interface (default is |)
 percentage_char=|
 # Define CPU, MEM and SWAP thresholds in %
@@ -45,7 +51,7 @@ disable=False
 # See https://scoutapm.com/blog/slow_server_flow_chart
 #
 # I/O wait percentage should be lower than 1/# (# = Logical CPU cores)
-# Leave commented to just use the default config: 
+# Leave commented to just use the default config:
 # Careful=1/#*100-20% / Warning=1/#*100-10% / Critical=1/#*100
 #iowait_careful=30
 #iowait_warning=40
@@ -414,8 +420,8 @@ style=DarkStyle
 
 [influxdb]
 # !!!
-# Will be DEPRECATED in future release. 
-# Please have a look on the new influxdb2 export module (compatible with InfluxDB 1.8.x and 2.x) 
+# Will be DEPRECATED in future release.
+# Please have a look on the new influxdb2 export module (compatible with InfluxDB 1.8.x and 2.x)
 # !!!
 # Configuration for the --export influxdb option
 # https://influxdb.com/

docs/config.rst

@@ -39,8 +39,15 @@ A first section (called global) is available:
 .. code-block:: ini
 
     [global]
-    # Does Glances should check if a newer version is available on PyPI?
-    check_update=true
+    # Refresh rate (default is a minimum of 3 seconds)
+    # Can be overwrite by the -t <sec> option
+    # It is also possible to overwrite it in each plugin sections
+    refresh=3
+    # Does Glances should check if a newer version is available on PyPI ?
+    check_update=false
+    # History size (maximum number of values)
+    # Default is 28800: 1 day with 1 point every 3 seconds
+    history_size=28800
 
 Each plugin, export module and application monitoring process (AMP) can
 have a section. Below an example for the CPU plugin:

glances/__init__.py

@@ -141,9 +141,9 @@ def main():
     global core
 
     # Create the Glances main instance
+    # Glances options from the command line are readed first (in __init__)
+    # then the options from the config file (in parse_args)
     core = GlancesMain()
-    config = core.get_config()
-    args = core.get_args()
 
     # Glances can be ran in standalone, client or server mode
-    start(config=config, args=args)
+    start(config=core.get_config(), args= core.get_args())

glances/main.py

@@ -33,8 +33,8 @@
 class GlancesMain(object):
     """Main class to manage Glances instance."""
 
-    # Default stats' refresh time is 3 seconds
-    refresh_time = 3
+    # Default stats' minimum refresh time is 2 seconds
+    DEFAULT_REFRESH_TIME = 2
     # Set the default cache lifetime to 1 second (only for server)
     cached_time = 1
     # By default, Glances is ran in standalone mode (no client/server)
@@ -205,8 +205,8 @@ def init_args(self):
                             help='SNMP authentication key (only for SNMPv3)')
         parser.add_argument('--snmp-force', action='store_true', default=False,
                             dest='snmp_force', help='force SNMP mode')
-        parser.add_argument('-t', '--time', default=self.refresh_time, type=float,
-                            dest='time', help='set refresh time in seconds [default: {} sec]'.format(self.refresh_time))
+        parser.add_argument('-t', '--time', default=self.DEFAULT_REFRESH_TIME, type=float,
+                            dest='time', help='set refresh time in seconds [default: {} sec]'.format(self.DEFAULT_REFRESH_TIME))
         parser.add_argument('-w', '--webserver', action='store_true', default=False,
                             dest='webserver', help='run Glances in web server mode (bottle needed)')
         parser.add_argument('--cached-time', default=self.cached_time, type=int,
@@ -258,6 +258,8 @@ def parse_args(self):
         args = self.init_args().parse_args()
 
         # Load the configuration file, if it exists
+        # This function should be called after the parse_args
+        # because the configration file path can be defined
         self.config = Config(args.conf_file)
 
         # Debug mode
@@ -268,6 +270,15 @@ def parse_args(self):
             from warnings import simplefilter
             simplefilter("ignore")
 
+        # Plugins refresh rate
+        if self.config.has_section('global'):
+            global_refresh = self.config.get_float_value('global',
+                                                         'refresh',
+                                                         default=self.DEFAULT_REFRESH_TIME)
+        if args.time == self.DEFAULT_REFRESH_TIME:
+            args.time = global_refresh
+        logger.debug('Global refresh rate is set to {} seconds'.format(args.time))
+
         # Plugins disable/enable
         # Allow users to disable plugins from the glances.conf (issue #1378)
         for s in self.config.sections():

glances/outputs/glances_curses.py

@@ -20,10 +20,9 @@
 """Curses interface class."""
 from __future__ import unicode_literals
 
-import re
 import sys
 
-from glances.compat import to_ascii, nativestr, b, u, itervalues, enable, disable
+from glances.compat import nativestr, u, itervalues, enable, disable
 from glances.globals import MACOS, WINDOWS
 from glances.logger import logger
 from glances.events import glances_events
@@ -104,7 +103,7 @@ class _GlancesCurses(object):
         # "<" (left arrow) navigation through process sort
         # ">" (right arrow) navigation through process sort
         # 'UP' > Up in the server list
-        # 'DOWN' > Down in the server list    
+        # 'DOWN' > Down in the server list
     }
 
     _sort_loop = ['cpu_percent', 'memory_percent', 'username',
@@ -666,9 +665,9 @@ def display(self, stats, cs_status=None):
                 self.args.cursor_position]
             confirm = self.display_popup(
                 'Kill process: {} (pid: {}) ?\n\nConfirm ([y]es/[n]o): '.format(
-                    selected_process_raw['name'], 
-                    selected_process_raw['pid']), 
-                    popup_type='yesno')
+                    selected_process_raw['name'],
+                    selected_process_raw['pid']),
+                popup_type='yesno')
             if confirm.lower().startswith('y'):
                 try:
                     ret_kill = glances_processes.kill(selected_process_raw['pid'])
@@ -684,7 +683,6 @@ def display(self, stats, cs_status=None):
                 'Kill process only available in standalone mode')
         self.kill_process = False
 
-
         # Display graph generation popup
         if self.args.generate_graph:
             self.display_popup('Generate graph in {}'.format(self.args.export_graph_path))

glances/plugins/glances_connections.py

@@ -2,7 +2,7 @@
 #
 # This file is part of Glances.
 #
-# Copyright (C) 2019 Nicolargo <nicolas@nicolargo.com>
+# Copyright (C) 2021 Nicolargo <nicolas@nicolargo.com>
 #
 # Glances is free software; you can redistribute it and/or modify
 # it under the terms of the GNU Lesser General Public License as published by
@@ -21,9 +21,8 @@
 from __future__ import unicode_literals
 
 from glances.logger import logger
-from glances.timer import getTimeSinceLastUpdate
 from glances.plugins.glances_plugin import GlancesPlugin
-from glances.compat import n, u, b, nativestr
+from glances.compat import nativestr
 
 import psutil
 

glances/plugins/glances_core.py

@@ -40,6 +40,8 @@ def __init__(self, args=None, config=None):
         # The core number is displayed by the load plugin
         self.display_curse = False
 
+    @GlancesPlugin._check_decorator
+    @GlancesPlugin._log_result_decorator
     def update(self):
         """Update core stats.
 

glances/plugins/glances_cpu.py

@@ -2,7 +2,7 @@
 #
 # This file is part of Glances.
 #
-# Copyright (C) 2019 Nicolargo <nicolas@nicolargo.com>
+# Copyright (C) 2021 Nicolargo <nicolas@nicolargo.com>
 #
 # Glances is free software; you can redistribute it and/or modify
 # it under the terms of the GNU Lesser General Public License as published by
@@ -79,7 +79,6 @@ def __init__(self, args=None, config=None):
     @GlancesPlugin._log_result_decorator
     def update(self):
         """Update CPU stats using the input method."""
-
         # Grab stats into self.stats
         if self.input_method == 'local':
             stats = self.update_local()

glances/plugins/glances_folders.py

@@ -2,7 +2,7 @@
 #
 # This file is part of Glances.
 #
-# Copyright (C) 2019 Nicolargo <nicolas@nicolargo.com>
+# Copyright (C) 2021 Nicolargo <nicolas@nicolargo.com>
 #
 # Glances is free software; you can redistribute it and/or modify
 # it under the terms of the GNU Lesser General Public License as published by
@@ -22,7 +22,7 @@
 
 import numbers
 
-from glances.compat import nativestr, n
+from glances.compat import nativestr
 from glances.folder_list import FolderList as glancesFolderList
 from glances.plugins.glances_plugin import GlancesPlugin
 from glances.logger import logger

glances/plugins/glances_mem.py

@@ -19,6 +19,7 @@
 
 """Virtual memory plugin."""
 
+from glances.logger import logger
 from glances.compat import iterkeys
 from glances.plugins.glances_plugin import GlancesPlugin
 

glances/plugins/glances_plugin.py

@@ -34,7 +34,7 @@
 from glances.logger import logger
 from glances.events import glances_events
 from glances.thresholds import glances_thresholds
-from glances.timer import Counter
+from glances.timer import Counter, Timer
 
 
 class GlancesPlugin(object):
@@ -104,6 +104,9 @@ def __init__(self,
         self.hide_zero = False
         self.hide_zero_fields = []
 
+        # Set the initial refresh time to display stats the first time
+        self.refresh_timer = Timer(0)
+
         # Init the stats
         self.stats_init_value = stats_init_value
         self.stats = None
@@ -584,6 +587,13 @@ def limits(self, input_limits):
         """Set the limits to input_limits."""
         self._limits = input_limits
 
+    def get_limits(self, item=None):
+        """Return the limits object."""
+        if item is None:
+            return self._limits
+        else:
+            return self._limits.get('{}_{}'.format(self.plugin_name, item), None)
+
     def get_stats_action(self):
         """Return stats for the action.
 
@@ -989,12 +999,29 @@ def trend_msg(self, trend, significant=1):
             ret = '\\'
         return ret
 
+    def get_refresh_time(self):
+        """Return the plugin refresh time"""
+        ret = self.get_limits(item='refresh')
+        if ret is None:
+            ret = self.args.time
+        return ret
+
     def _check_decorator(fct):
-        """Check if the plugin is enabled."""
+        """Check decorator for update method.
+        It checks:
+        - if the plugin is enabled.
+        - if the refresh_timer is finished
+        """
         def wrapper(self, *args, **kw):
-            if self.is_enable():
+            if self.is_enable() and self.refresh_timer.finished():
+                # Run the method
                 ret = fct(self, *args, **kw)
+                # Reset the timer
+                self.refresh_timer.set(self.get_refresh_time())
+                self.refresh_timer.reset()
             else:
+                # No need to call the method
+                # Return the last result available
                 ret = self.stats
             return ret
         return wrapper

glances/plugins/glances_ports.py

@@ -2,7 +2,7 @@
 #
 # This file is part of Glances.
 #
-# Copyright (C) 2019 Nicolargo <nicolas@nicolargo.com>
+# Copyright (C) 2021 Nicolargo <nicolas@nicolargo.com>
 #
 # Glances is free software; you can redistribute it and/or modify
 # it under the terms of the GNU Lesser General Public License as published by
@@ -60,9 +60,6 @@ def __init__(self, args=None, config=None):
         self.stats = GlancesPortsList(config=config, args=args).get_ports_list() + \
             GlancesWebList(config=config, args=args).get_web_list()
 
-        # Init global Timer
-        self.timer_ports = Timer(0)
-
         # Global Thread running all the scans
         self._thread = None
 
@@ -73,6 +70,7 @@ def exit(self):
         # Call the father class
         super(Plugin, self).exit()
 
+    @GlancesPlugin._check_decorator
     @GlancesPlugin._log_result_decorator
     def update(self):
         """Update the ports list."""
@@ -84,15 +82,15 @@ def update(self):
                 thread_is_running = False
             else:
                 thread_is_running = self._thread.is_alive()
-            if self.timer_ports.finished() and not thread_is_running:
+            if not thread_is_running:
                 # Run ports scanner
                 self._thread = ThreadScanner(self.stats)
                 self._thread.start()
-                # Restart timer
-                if len(self.stats) > 0:
-                    self.timer_ports = Timer(self.stats[0]['refresh'])
-                else:
-                    self.timer_ports = Timer(0)
+                # # Restart timer
+                # if len(self.stats) > 0:
+                #     self.timer_ports = Timer(self.stats[0]['refresh'])
+                # else:
+                #     self.timer_ports = Timer(0)
         else:
             # Not available in SNMP mode
             pass

glances/plugins/glances_processcount.py

@@ -62,6 +62,7 @@ def __init__(self, args=None, config=None):
 
         # Note: 'glances_processes' is already init in the glances_processes.py script
 
+    @GlancesPlugin._check_decorator
     @GlancesPlugin._log_result_decorator
     def update(self):
         """Update processes stats using the input method."""

glances/processes.py

@@ -2,7 +2,7 @@
 #
 # This file is part of Glances.
 #
-# Copyright (C) 2019 Nicolargo <nicolas@nicolargo.com>
+# Copyright (C) 2021 Nicolargo <nicolas@nicolargo.com>
 #
 # Glances is free software; you can redistribute it and/or modify
 # it under the terms of the GNU Lesser General Public License as published by
@@ -17,11 +17,10 @@
 # You should have received a copy of the GNU Lesser General Public License
 # along with this program. If not, see <http://www.gnu.org/licenses/>.
 
-import operator
 import os
 
-from glances.compat import iteritems, itervalues, listitems, iterkeys
-from glances.globals import BSD, LINUX, MACOS, SUNOS, WINDOWS, WSL
+from glances.compat import iterkeys
+from glances.globals import BSD, LINUX, MACOS, WINDOWS
 from glances.timer import Timer, getTimeSinceLastUpdate
 from glances.filter import GlancesFilter
 from glances.logger import logger
@@ -403,7 +402,7 @@ def set_sort_key(self, key, auto=True):
         else:
             self.auto_sort = auto
             self._sort_key = key
-    
+
     def kill(self, pid, timeout=3):
         """Kill process with pid"""
         assert pid != os.getpid(), "Glances can kill itself..."

glances/standalone.py

@@ -150,7 +150,8 @@ def __serve_once(self):
         if not self.quiet:
             # The update function return True if an exit key 'q' or 'ESC'
             # has been pressed.
-            ret = not self.screen.update(self.stats, duration=adapted_refresh)
+            ret = not self.screen.update(self.stats,
+                                         duration=adapted_refresh)
         else:
             # Nothing is displayed
             # Break should be done via a signal (CTRL-C)