I missed the JSP -- did it disable sessions?
If not, then the most common way to cause such an issue is to use a test
harness that does not understand/preserve cookies between hits and thus
produces a different session for each hit. Empty sessions are small,
but do add up over time and choke the process. In that case the problem
is /almost/ purely one of testing methodology in that the test harness
should simulate realistic usage. I say /almost/ in that there is some
DOS prospect here -- and thus you may wish to require authentication
prior to establishing a session, for instance...
--
Jess Holle
Leon Rosenberg wrote:
i downloaded the war file and put it info webapps (it was the only webapp )
started tomcat (5.5.17)
started following in another shell:
while true; do wget "http://localhost:8080/LoadTest/something.jsp"; ; done
canceled after some thousands of iterations
i checked the memory usage via activity monitor (macosx) and tomcat
manager app. Both showed no changes.
Could it be that your python lib is keeping connection or something?
Have you checked via tomcat maanager how many connections you actually
have?
regards
Leon
On Jan 24, 2008 4:31 PM, Ofer Kalisky <[EMAIL PROTECTED]> wrote:
That's what I'm saying, I've been sitting on this for two days and can't
figure it out.
Do you mean to say that you tried it and even when accessing the JSP with
the script - your memory stays low? What am I doing wrong then?
Please notice the tomcat version and the JRE version I stated (6.0.14,
jre1.6.0_03).
One more thing: as I said, I'm trying it with 64M of max heap space, but I
figured, if it goes to 99.9% mem use, there's no use raising it (even though
I tried and it reached 99.9% after a short while)
Ofer.
----- Original Message -----
From: "Leon Rosenberg" <[EMAIL PROTECTED]>
To: "Tomcat Users List" <users@tomcat.apache.org>
Sent: Thursday, January 24, 2008 5:25 PM
Subject: Re: Tomcat memory leak?
I downloaded your example.
So you are telling us, that simply calling a JSP file with html markup
only and without any code kills your tomcat?
Regards
Leon
On Jan 24, 2008 4:19 PM, Ofer Kalisky <[EMAIL PROTECTED]> wrote:
Ok, since sending an attachment doesn't work,
simply create a webapp by the name of LoadTest and create two files
inside:
something.jsp and something.html
the content of both files should be:
<html><body/></html>
try the load.py with both:
import httplib
i = 0
while 1:
conn = httplib.HTTPConnection("localhost:8080")
conn.request("GET", "/LoadTest/something.jsp")
r1 = conn.getresponse()
if (i % 500 == 0):
print i
i = i + 1
conn.close()
sorry for any inconvenience
Ofer.
----- Original Message -----
From: "Ofer Kalisky" <[EMAIL PROTECTED]>
To: "Tomcat Users List" <users@tomcat.apache.org>
Sent: Thursday, January 24, 2008 5:08 PM
Subject: Re: Tomcat memory leak?
I think the mailing list blocks war files...
trying with zip...
----- Original Message -----
From: <[EMAIL PROTECTED]>
To: "Tomcat Users List" <users@tomcat.apache.org>
Sent: Thursday, January 24, 2008 5:00 PM
Subject: Re: Tomcat memory leak?
Good Morning Ofer
I dont see attachement of /LoadTest/something.jsp
Martin-
----- Original Message -----
Wrom: FPEGAUTFJMVRESK
To: users@tomcat.apache.org
Sent: Thursday, January 24, 2008 9:51 AM
Subject: Tomcat memory leak?
Hi,
I know it's weird, but I'm doing the simplest thing and can't believe
there such a leak that I'm the first one to notice. I bet it's my bad,
please someone explain, what I'm doing wrong...
I created the simplest JSP and when I load test it - tomcat (6.0.14,
jre1.6.0_03) goes to 99.9% memory use in a few minutes (If I raise the
max
heap size it takes longer, but it happens several minutes afterwards),
and
when I stop bombarding it, it doesn't return to the usual percentage.
When I try the same with an HTML instead of a JSP, that returns
exactly
the same - it stays on 12%-20%, cleans with the garbage collector, and
returns to the usual percentage (about 12%).
I tried profiling with several plugins and external programs, but I
really
can't understand what's going on. They tell me that most of the
allocated
bytes are "char[]", but I'm not sure who's the allocator and if there's
anything I can do about it...
Attached are:
1. a test in python that bombards the tomcat,
2. a war with both something.jsp and something.html (they are both the
same, but when I bombard something.html everything is ok, and when I do
the
same for something.jsp - the problem occurs)
Can anyone tell me what I'm doing wrong? does it happen to you too?
Thanks, Ofer.
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