Thank you for the very helpful explanation. On Mon, May 4, 2009 at 5:12 PM, sebb <[email protected]> wrote:
> On 04/05/2009, Ed Young <[email protected]> wrote: > > Of course, moments after sending this email, I seem to have solved my > > problem. I'm up to 10 threads with no issues. > > > > I simply reduced my TCP Sampler Config Timeout value to 500ms. > > > > Still curious about what NoDelay is and some of the details of Timeout > set > > in the TCP Sampler Config vs set in the TCP Sampler itself. > > > > NoDelay just means that the TCP Sampler calls > java.net.Socket.setTcpNoDelay(boolean on) which is used to > disable/enable Nagle's algorithm: > > http://en.wikipedia.org/wiki/Nagle%27s_algorithm > > The timeout is used to set the read timeout, which just means that the > sample will finish when the timeout expires, rather than when the EOL > character is reached. > > > > > On Mon, May 4, 2009 at 1:24 PM, Ed Young <[email protected]> wrote: > > > > > I am developing a test to execute a sequence of simple text based > messages, > > > each message expecting a response. The message requests are configured > using > > > the TCP Config and TCP Samplers as Thread Group children. > > > > > > The TCPSampler sees the responses until I get past 2 threads. Then it > > > misses the response from the 3rd thread every time. I know it's > missing the > > > responses because I can see the responses come back by watching a log > file. > > > > > > It looks to me like the thread continues before it ever gets back a > > > response, which is not the behavior I want. I want it to wait until > the TCP > > > Sampler timeout value and then proceed. > > > > > > I suspect that the problem is that I'm misconfiguring the TCP Sampler, > > > because I'm not sure of the use for some of it's parameters. > > > > > > The behavior varies alot as I experiment with the values, but I > haven't > > > gotten past the 3 thread point with any combination. > > > > > > My questions are about whether I'm using the parameters correctly. > > > > > > > > > - I have unchecked "Re-use connection" This makes sense to me > because I > > > want each thread to use it's own socket. > > > > > > > > > - I have set the TCP Sampler Config Timeout value to 5000ms. > > > > > > I believe this means "for each TCP Sampler let the default timeout be > > > 5000ms". Is this correct? > > > > > > - If I leave the Timeout value blank, I never see any outgoing or > > > resonse traffic at all in jmeter, but I can see that the message > was sent > > > and received according to the target system log. It seems that > jmeter is > > > hanging up for some reason. I have to stop the thread manually > from the run > > > menu. > > > > > > > > > - Does setting one of the actual TCP Sampler Timeout values > Override or > > > Extend the default value set in the config element? > > > > > > - What does checking the NoDelay do? > > > > > > > > > I'm running jmeter 2.3.2 r665936, but I have tried it on the snapshot > > > version I have and get the same results. > > > > > > -- > > > - Ed > > > > > > > > > > > > > -- > > > > - Ed > > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [email protected] > For additional commands, e-mail: [email protected] > > -- - Ed
