If you need a thread per call, it is likely that there is an OS limit to 
the number of threads that you can use.  I suggest trying to run multiple 
SIPp instances, and if that doesn't work you may possibly need to run SIPp 
on multiple machines. (Unless of course anyone else has a better 
explanation).  You may also be able to adjust things with ulimit or 
sysctls.

Charles

[EMAIL PROTECTED] wrote on 11/20/2007 08:00:42 AM:

> I'm using sipp 2.0.1, compiled by hand with pcapplay support, on a 
> Debian 4.0 machine. At around 384 calls (plus or minus 1 or 2), sipp 
> consistently crashes with:
> 
> 2007-11-20 13:41:39: Can create thread to send RTP packets.
> sipp: There were more errors, enable -trace_err to log them.
> 
> This occurs with the libpcap0.7-dev and libpcap0.8-dev Debian packages, 
> and also with libpcap-0.9.8 compiled from source. The command I'm using 
is:
> 
> sipp -sf client.xml -s 1234567890 1.2.3.4 -r 1 -l 500 -rp 10
> 
> (IP address modified), and client.xml is attached.
> 
> Can anyone shed any light on this?
> 
> -- 
> Alistair Cunningham
> +1 888 468 3111
> +44 20 799 39 799
> sip:[EMAIL PROTECTED]
> http://integrics.com/
> <?xml version="1.0" encoding="ISO-8859-1" ?>
> <!DOCTYPE scenario SYSTEM "sipp.dtd">
> 
> <!-- This program is free software; you can redistribute it and/or -->
> <!-- modify it under the terms of the GNU General Public License as -->
> <!-- published by the Free Software Foundation; either version 2 of the 
-->
> <!-- License, or (at your option) any later version. -->
> <!-- -->
> <!-- This program is distributed in the hope that it will be useful, -->
> <!-- but WITHOUT ANY WARRANTY; without even the implied warranty of -->
> <!-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the -->
> <!-- GNU General Public License for more details. -->
> <!-- -->
> <!-- You should have received a copy of the GNU General Public License 
-->
> <!-- along with this program; if not, write to the -->
> <!-- Free Software Foundation, Inc., -->
> <!-- 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA -->
> <!-- -->
> <!--                 Sipp 'uac' scenario with pcap (rtp) play -->
> <!-- -->
> 
> <scenario name="UAC with media">
>   <!-- In client mode (sipp placing calls), the Call-ID MUST be -->
>   <!-- generated by sipp. To do so, use [call_id] keyword.  -->
>   <send retrans="500">
>     <![CDATA[
> 
>       INVITE sip:[EMAIL PROTECTED]:[remote_port] SIP/2.0
>       Via: SIP/2.0/[transport] [local_ip]:[local_port];branch=[branch]
>       From: sipp <sip:[EMAIL PROTECTED]:[local_port]>;tag=[call_number]
>       To: sut <sip:[EMAIL PROTECTED]:[remote_port]>
>       Call-ID: [call_id]
>       CSeq: 1 INVITE
>       Contact: sip:[EMAIL PROTECTED]:[local_port]
>       Max-Forwards: 70
>       Subject: Performance Test
>       Content-Type: application/sdp
>       Content-Length: [len]
> 
>       v=0
>       o=user1 53655765 2353687637 IN IP[local_ip_type] [local_ip]
>       s=-
>       c=IN IP[local_ip_type] [local_ip]
>       t=0 0
>       m=audio [media_port] RTP/AVP 8
>       a=rtpmap:8 PCMA/8000
>       a=rtpmap:101 telephone-event/8000
>       a=fmtp:101 0-11,16
> 
>     ]]>
>   </send>
> 
>   <recv response="100" optional="true">
>   </recv>
> 
>   <recv response="180" optional="true">
>   </recv>
> 
>   <!-- By adding rrs="true" (Record Route Sets), the route sets -->
>   <!-- are saved and used for following messages sent. Useful to test 
-->
>   <!-- against stateful SIP proxies/B2BUAs. -->
>   <recv response="200" rtd="true" crlf="true">
>   </recv>
> 
>   <!-- Packet lost can be simulated in any send/recv message by -->
>   <!-- by adding the 'lost = "10"'. Value can be [1-100] percent. -->
>   <send>
>     <![CDATA[
> 
>       ACK sip:[EMAIL PROTECTED]:[remote_port] SIP/2.0
>       Via: SIP/2.0/[transport] [local_ip]:[local_port];branch=[branch]
>       From: sipp <sip:[EMAIL PROTECTED]:[local_port]>;tag=[call_number]
>       To: sut <sip:[EMAIL PROTECTED]:[remote_port]>[peer_tag_param]
>       Call-ID: [call_id]
>       CSeq: 1 ACK
>       Contact: sip:[EMAIL PROTECTED]:[local_port]
>       Max-Forwards: 70
>       Subject: Performance Test
>       Content-Length: 0
> 
>     ]]>
>   </send>
> 
>   <!-- Play a pre-recorded PCAP file (RTP stream) using lo interface -->
>   <!-- and that was originally meant for destination port 2006 -->
>   <nop>
>     <action>
>       <exec play_pcap_audio="g711a.pcap"/>
>     </action>
>   </nop>
> 
>   <!-- Pause 90 seconds, which is approximately the duration of the -->
>   <!-- PCAP file -->
>   <pause milliseconds="90000"/>
> 
>   <!-- The 'crlf' option inserts a blank line in the statistics report. 
-->
>   <send retrans="500">
>     <![CDATA[
> 
>       BYE sip:[EMAIL PROTECTED]:[remote_port] SIP/2.0
>       Via: SIP/2.0/[transport] [local_ip]:[local_port];branch=[branch]
>       From: sipp <sip:[EMAIL PROTECTED]:[local_port]>;tag=[call_number]
>       To: sut <sip:[EMAIL PROTECTED]:[remote_port]>[peer_tag_param]
>       Call-ID: [call_id]
>       CSeq: 2 BYE
>       Contact: sip:[EMAIL PROTECTED]:[local_port]
>       Max-Forwards: 70
>       Subject: Performance Test
>       Content-Length: 0
> 
>     ]]>
>   </send>
> 
>   <recv response="200" crlf="true">
>   </recv>
> 
>   <!-- definition of the response time repartition table (unit is ms) 
-->
>   <ResponseTimeRepartition value="10, 20, 30, 40, 50, 100, 150, 200"/>
> 
>   <!-- definition of the call length repartition table (unit is ms) -->
>   <CallLengthRepartition value="10, 50, 100, 500, 1000, 5000, 10000"/>
> 
> </scenario>
> 
> 
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