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Code Issues Releases Wiki Activity

Avoid ulimit kicking in when running ~1k nodes

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This commit is contained in:
Lasse Karstensen 2012-06-02 17:47:51 +02:00
parent 32f9909e6d
commit fbb6614e15
1 changed files with 23 additions and 15 deletions
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38
tools/munin-node-from-hell/muninnode-from-hell
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@ -22,6 +22,10 @@ VERSION = "muninnode-from-hell v0.1"
modules = {} modules = {}
class MuninPlugin: class MuninPlugin:
def __init__(self):
self.current_load = None
self.current_locks = None
def sleep_fetch(self, conf): def sleep_fetch(self, conf):
period = None period = None
if conf.get("mode") == "sleepy" and conf.get("sleepyness"): if conf.get("mode") == "sleepy" and conf.get("sleepyness"):
@ -36,14 +40,26 @@ class MuninPlugin:
def sleep_config(self, conf): def sleep_config(self, conf):
return self.sleep_fetch(conf) return self.sleep_fetch(conf)
def find_load(self):
# At about a thousand node instances you get this:
#IOError: [Errno 24] Too many open files: '/proc/loadavg'
# cache it for a bit..
if (not self.current_load) or random.randint(0,100) == 1:
load = open("/proc/loadavg", "r").read()
load, rest = load.split(" ", 1)
self.current_load = float(load)
return self.current_load
def find_locks(self):
if (not self.current_locks) or random.randint(0,100) == 1:
fp = open("/proc/locks", "r")
self.current_locks = len(fp.readlines())
return self.current_locks
class load(MuninPlugin): class load(MuninPlugin):
def fetch(self, conf): def fetch(self, conf):
self.sleep_fetch(conf) self.sleep_fetch(conf)
load = open("/proc/loadavg", "r").read() return "load.value %.2f" % self.find_load()
load, rest = load.split(" ", 1)
load = float(load)
return "load.value %.2f" % load
def config(self, conf): def config(self, conf):
self.sleep_config(conf) self.sleep_config(conf)
@ -60,9 +76,7 @@ modules["load"] = load()
class locks(MuninPlugin): class locks(MuninPlugin):
def fetch(self, conf): def fetch(self, conf):
self.sleep_fetch(conf) self.sleep_fetch(conf)
fp = open("/proc/locks", "r") return "locks.value %i" % self.find_locks()
fdata = fp.readlines()
return "locks.value %i" % len(fdata)
def config(self, conf): def config(self, conf):
self.sleep_config(conf) self.sleep_config(conf)
@ -171,10 +185,7 @@ modules["graph_area"] = graph_area()
class utf8_graphcat(MuninPlugin): class utf8_graphcat(MuninPlugin):
"A plugin with a graph category which has UTF-8 in it" "A plugin with a graph category which has UTF-8 in it"
def fetch(self, conf): def fetch(self, conf):
load = open("/proc/loadavg", "r").read() return "apples.value %.2f" % self.find_load()
load, rest = load.split(" ", 1)
load = float(load)
return "apples.value %.2f" % load
def config(self, conf): def config(self, conf):
return """graph_title Example UTF-8 graph return """graph_title Example UTF-8 graph
@ -188,10 +199,7 @@ modules["utf8_graphcat"] = utf8_graphcat()
class utf8_graphname(MuninPlugin): class utf8_graphname(MuninPlugin):
"A plugin with a UTF-8 name" "A plugin with a UTF-8 name"
def fetch(self, conf): def fetch(self, conf):
load = open("/proc/loadavg", "r").read() return "apples.value %.2f" % self.find_load()
load, rest = load.split(" ", 1)
load = float(load)
return "apples.value %.2f" % load
def config(self, conf): def config(self, conf):
return """graph_title Example UTF-8 graph return """graph_title Example UTF-8 graph