Improve default configuration for ctx_switches

conf/glances.conf

@@ -25,12 +25,12 @@ steal_warning=70
 steal_critical=90
 #steal_log=True
 # I/O wait percentage should be lower than 1/# (of CPU cores)
-# Let blanck to default config (1/#-20% / 1/# / 1/#+20%)
-#iowait_careful=20
-#iowait_warning=25
-#iowait_critical=30
-# Context switch limit per core / second
-# For example, if you have 2 Core, critical limit will be 28000/sec
+# Let commented for default config (1/#-20% / 1/#-10% / 1/#)
+#iowait_careful=30
+#iowait_warning=40
+#iowait_critical=50
+# Context switch limit (core / second)
+# Let commented for default config (critical is 56000/# (of CPU core))
 ctx_switches_careful=10000
 ctx_switches_warning=12000
 ctx_switches_critical=14000

glances/config.py

@@ -134,8 +134,12 @@ class Config(object):
         # By default I/O wait should be lower than 1/number of CPU cores
         iowait_bottleneck = (1.0 / multiprocessing.cpu_count()) * 100.0
         self.set_default('cpu', 'iowait_careful', str(iowait_bottleneck - (iowait_bottleneck * 0.20)))
-        self.set_default('cpu', 'iowait_warning', str(iowait_bottleneck))
-        self.set_default('cpu', 'iowait_critical', str(iowait_bottleneck + (iowait_bottleneck * 0.20)))
+        self.set_default('cpu', 'iowait_warning', str(iowait_bottleneck - (iowait_bottleneck * 0.10)))
+        self.set_default('cpu', 'iowait_critical', str(iowait_bottleneck))
+        ctx_switches_bottleneck = 56000 / multiprocessing.cpu_count()
+        self.set_default('cpu', 'ctx_switches_careful', str(ctx_switches_bottleneck - (ctx_switches_bottleneck * 0.20)))
+        self.set_default('cpu', 'ctx_switches_warning', str(ctx_switches_bottleneck - (ctx_switches_bottleneck * 0.10)))
+        self.set_default('cpu', 'ctx_switches_critical', str(ctx_switches_bottleneck))
 
         # Per-CPU
         if not self.parser.has_section('percpu'):