Hello,
perhaps this is a problem caused by the cookie manager?
I encounter a rather strange behaviour involving JMeter (2.0.2 on JKD
1.4.2_05) and Tomcat (4.1.18.0).
*Sometimes* in my load test the session is being invalidated after the login.
With low load (<= 10 Threads) the tests run without problems.
With higher loads all threads are successful with the first request (login) but
some of them (about 15%) fail in the second request because of an invalid
session.
Investigating the requests and the responses I have concluded that
1. In threads that perform timely adjucent logins exactly the same sessionids
are received.
2. When these threads perform the second request, they send another sessionid.
These new sessionids differ from each other and do not belong to any earlier
thread.
Example (simplified):
Thread sessionid in Login/Response Sessionid in
CustomerSelect/request
1 101 101 (OK)
2 102 102 (OK)
3 103 500 (not OK)
4 103 (same as in #3) 600 (not OK)
My questions:
- What might be the cause of the identical sessionids for the different threads?
Is it a know problem in either JMeter or Tomcat?
- Why does JMeter send a fake sessionid?
One idea was that the concurrent logins might count as one login trial because
of the KeepAlive flag.
I have turned the KeepAlive flag from the login request off, but this did not
help.
Does anybody have further ideas?
Thanks in advance!
Noam Paz
P.S.
Of course I use the cookie manager in my testplan and do not manipulate the
sessionid in the testplan.
Best regards / Viele Grüße
Noam Paz
Deutsche Bank AG
GTO CIO PCB IT/O
Sales & Advisory IT
Brokerage & Advisory
Financial Planning
Alfred Herrhausen Allee 10a
D-65760 Eschborn
Tel: +49-69-910-69308
Fax: +49-69-910-68425
Mailto:[EMAIL PROTECTED]
http://is.ds.gt.pcam.intranet.db.com
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