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Today's Topics:
1. storage leak in NetSNMP? (Lieven Marchand)
----------------------------------------------------------------------
Message: 1
Date: Mon, 21 Oct 2013 09:35:15 +0000 (UTC)
From: Lieven Marchand <lieven.march...@gmail.com>
To: beginners@haskell.org
Subject: [Haskell-beginners] storage leak in NetSNMP?
Message-ID: <loom.20131021t112909-...@post.gmane.org>
Content-Type: text/plain; charset=us-ascii
Hi,
I have a small script that computes a list of network devices, directs an
SNMP query at each of them, computes a report from the result of that query
and prints that. I would expect that to run in constant space but instead
memory usage keeps going up until the script is killed by the OOM killer.
Is it possible that the NetSNMP library is keeping hold of all the results
of its session?
Here's part of my code:
analyzeSNMP :: Line -> IO()
analyzeSNMP x = do
snmp <- getSNMP x
putStrLn $ getNetworks (x, snmp)
getSNMP :: Line -> IO (Either String [SnmpResult])
getSNMP line = snmpWalk snmp_version_2c (encodeUtf8 (primaryRouterLoopback
line)) (DBC.pack "XXX") mib2
getNetworks :: (Line, Either String [SnmpResult]) -> String
main = do
initialize
args <- arguments
wans <- case wanInventoryFileName args of
Just s -> parseWANInventory s
Nothing -> return DefaultWAN.wans
let lines = makeLines (tail wans)
mapM_ analyzeSNMP lines
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