[Spread-users] packet loss?
yairamir at cnds.jhu.edu
Sun Jul 21 09:44:02 EDT 2002
I run similar tests on my machine but I did not experience any
message loss in any of the tests.
What I thought initially is that your client was disconnected with
1000 messages, so I wanted you to run with 10,000 and 100,000 messages
to see if you receive any more messages. It seems that you do and that
you are loosing some percentage of your messages. This is really odd.
I never saw Spread configuration that behaves like that.
You should run the out-of-the-box spflooder. Maybe the problem is in
Having said that, I did experience a very slow Spread operation when
running on Win2000 and one daemon in the system - as in your
experiment. Spread did about 120 mess/sec only (compared with
10,000 at least I would expect). More on that in the next message.
Fernando> I'm printing on the screen every 100 messages received.
Fernando> sending 10.000 msgs the receiver gets 7600-7800 of them
Fernando> sendong 100.000 msgs the received are about 97.000
Fernando> what do you think the problem is?
Fernando> thanks for your help, I really appreciate it.
>> -----Original Message-----
>> From: Yair Amir [mailto:yairamir at cnds.jhu.edu]
>> Sent: giovedì 18 luglio 2002 18.25
>> To: spread-users-admin at lists.spread.org; Fernando Marotta
>> Cc: spread-users at lists.spread.org
>> Subject: Re: [Spread-users] packet loss?
>> I think I know what your problem is.
>> Try sending 10,000 messages and tell us how many you receive.
>> Also try 100,000 messages.
>> :) Yair.
>> Fernando> Hi everybody,
>> Fernando> I downloaded a couple of days ago spread, and found
>> it very interesting.
>> Fernando> Just to test its performance I modified slightly
>> the "spflooder" program, to
>> Fernando> show the time elapsed from the first to the last
>> message received (receiving
>> Fernando> mode).
>> Fernando> I'm using spread under Win2K (3.16.2, binary distro).
>> Fernando> My "tests" are with one sender and one receiver
>> (and the spread exe) on the
>> Fernando> same machine.
>> Fernando> I've experienced a high packet loss rate,
>> regardless of the delivery mode in
>> Fernando> the SP_send call (I've used all, from UNRELIABLE to SAFE).
>> Fernando> But, for instance, when sending 1000 msgs of 100
>> bytes, no more than 700
>> Fernando> msgs are received.
>> Fernando> Probably I'm making some mistakes....
>> Fernando> Any idea?
>> Fernando> Thanks in advance.
>> Fernando> Cheers
>> Fernando> Fernando.
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