[smokeping-users] nss_ldap smokeping problem - fping polling taking too long problem

[Larry Low]

Doesn't the -t command do this?

Give this scenario

5.5.5.0/24 255 non-responsive hosts

-i 1
-p 1
-C 5

The ICMP requests should be sent in not much over .255 seconds but instead takes over 5 seconds.  I'm trying to determine what is causing fping to take so long to loop through all the hosts.  I'll keep hacking away at the code hoping to find an answer.

----
Larry Low
4150 N Drinkwater Blvd., 5th Floor
Scottsdale, AZ  85251
Office: 480.385.7045
E-mail: llow at telesphere.com'

Telesphere Networks, Inc


-----Original Message-----
From: Chris Wilson [mailto:chris at aptivate.org]
Sent: Monday, March 24, 2008 2:38 PM
To: Larry Low
Cc: smokeping-users at lists.oetiker.ch
Subject: Re: [smokeping-users] nss_ldap smokeping problem - fping polling taking too long problem

Hi Larry,

On Mon, 24 Mar 2008, Larry Low wrote:

> I think I see the problem with fping taking so long.  It does not seem
> to be multithreaded so a host not responding holds up the entire
> process.
>
> Am I correct?  Anyone know of another solution.  I want to be able to
> send 5 pings to 500 hosts with growth of about 3000 per poller.

fping does not need to be multithreaded, it's asynchronous instead, which
is much more efficient.

The main limit on fping is that it has to have enough time (at the maximum
ping rate) to send the specified number of pings to each host, and then
wait for the answer to arrive from the last one, before its timeout
expires.

To ping a lot of hosts, you may have to reduce the minimum time between
pings (which may require hacking fping) and set the timeout longer than
the highest RTT that you expect from any host, otherwise the final ping
response from a slow host will be lost, and reported as lost to smokeping.

Cheers, Chris.
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