Re: What is NETTYPE

kbg wrote: > > I don't understand how the NETTYPE parameter affects the performance of > the db and how I must configure it, > is it necessary to define it in the onconfig file? > what is the diffrence between the NET and CPU NETTYPE, > It's not well described in the Informix literature... The NETTYPE parameters define, for each type of interface (ie shm, tli, soc, pip, etc) whether to set up listener threads in the CPU VPs or to start special purpose NET VPs to do the listening for connections and request packets how many listeners to set up, and how many concurrent connections to allow on that type of interface. For best performance and minimal impact on the system you should configure shared memory connections (ipcshm) on CPU VPs using ALL of the CPU VPs and pipe and network connections (tlitcp, soctcp, ipcpip, etc) using NET VPs ideally setting up several listeners (I use 8 normally). Ex: NETTYPE ipcshm,4,50,CPU #Listen in 1st 4 CPU VPs, #Permit 50 SHM connections NETTYPE tlitcp,4,100,NET #Start 4 NET VPs to listen #Permit 100 network connectionsIf you configure more CPU listeners than you have CPU VPs the engine will start up NET VPs to run the remaining listeners. So if the line above is in a config file with NUMCPUVPS 2 then two listeners will be in those CPU VPs and 2 will be in NET VPs which is undesireable. The overhead of shared memory listeners in NET VPs is too great so you would want to reduce the number of ipcshm listeners to equal the number of CPU VPs. > Thank's for the answer... You're welcome. Art S. Kagel