Multithreading with single api

Hi,

I have written a small code in C to poll switchs in a fiber optic  
network. I must get counters values on this switchs for each port. I  
have threaded the code in order to be able to poll 200 switchs in  
some minutes.

I notice that with more than 4 threads I have a lot of SNMP timeout.  
It's quite strange because the machine source is on a recent Blade  
Center, the network is fiber and the switch are quite strong.
I poll one switch with one thread. With 5 threads I poll 5 switchs at  
the same time.
For the moment I just have 8 switchs on all network and I poll only  
one port counter for each switch.

I use :

   	snmp_sess_init( &session );
		session.timeout = 2000000;
		session.retries = 5;
		session.version = SNMP_VERSION_2c;
	snmp_synch_setup(&session);
	sess_handle = snmp_sess_open(&session)
	snmp_sess_synch_response(sess_handle, pdu, &response)
	snmp_synch_reset(&session);
	snmp_sess_close(sess_handle)

Is there something I miss?

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