>> When I start my test plan with several users it works fine. But when I
>> increase user count I receive the following types of exceptions in the

s> How many users?
it starts from 400 users.

>> responses (HTTPSampler):
>> 1) java.io.IOException: Error writing to server
>> (often)
s> Sounds like a server or network problem.
Yes, but what kind of problem? I had this exception with different
servers.

>> 2) java.net.BindException: Address already in use: connect
>> (sometimes) Server mode...

s> This can be caused by running out of sockets on the host system.

>> Maybe can't send data to client JMeter listener.
>> (but I received it at client mode too)
>> 3) java.net.SocketException: Unexpected end of file from server
>> (sometimes)
>> 4) java.net.SocketException: Software caused connection abort: recv failed
>> (once)
>>
>> I guess it is not JMeter issue, but I can't understand what is the
>> reason. I even can't detect dependencies when it occurs and what should I
>> do to fix it. I never seen this errors in browser. Also I am receiving

s> But presumably you don't run lots of browsers at once ...
Yes, but I am tried to work during system loading to reproduce them.

>> them for loading html resource on different application servers and
>> applications. Maybe low-level server socket settings?

s> See above - only one is likely to be a local problem.

>> Thank you for advice.

s> Are you using Keep Alive?
Yes, it sets by default.

s> If you are retrieving multiple times from the same host, you should
s> probably enable it for all but the last.
Thank you.
-- 
Regards,
Dmitry Kudrenko
ARDAS group http://ardas.dp.ua


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