I havent had any problems to date with it but I have only run up to 10 threads. Today I'll be pushing it to around 400 threads across a couple of remote servers. I do a lot of regular expression parsing across some large and complex html pages. I'll pay particular attention to the correctness today and see if I have any issues.
I think the key thing is to prove that the regular expression engine should have picked up the match (such as using perl as mentioned) and that there wasnt some other issue at hand. You need to isolate the problem down first and be certain of the exact inputs.
Will hopefully touch base later with my results.
Craig.
Shawn Elliott wrote:
I too have had problems with the regular expression not picking up matches. I have closely inspected the response page and it should have picked it up. Though I have not logged it out to a file to see exactly what it is picking up. (Will do that today)
Another piece of information is that the regular expression seems to not match correctly at a higher rate when I have a single thread that is looping, opposed to multiple threads not looping.
Furthermore I have 4 thread groups each running a regular expression...
Example Thread Grp 1: NumofThreads=1, Loop=10 Thread Grp 2: NumofThreads=1, Loop=10 Thread Grp 3: NumofThreads=1, Loop=10 Thread Grp 4: NumofThreads=1, Loop=10
Results in the regular expression not matching anything, more than the following scenario
Thread Grp 1: NumofThreads=10, Loop=1 Thread Grp 2: NumofThreads=10, Loop=1 Thread Grp 3: NumofThreads=10, Loop=1 Thread Grp 4: NumofThreads=10, Loop=1
.... writing this email just made me think of something... Each regular expression is saving its result to a variable defined in the 'User Parameters' is this parameter shared between all the threads?? There for the expression is just over writing the other threads value??
-shawn
-----Original Message-----
From: Craig Palmer [mailto:[EMAIL PROTECTED] Sent: Wednesday, February 04, 2004 11:47 AM
To: JMeter Users List
Subject: Re: JMeter from time to time doesn't calculate regular
expressions for some threads
It is very difficult to diagnose what appears to be a transient issue, let alone fix it. I think I can guarantee that Jmeter does NOT have a setting/configuration that introduces random problems to occur at random times.
In every case that I have found the regular expression not working, I have looked carefully at the content and found my mistake every time. I would bet that it isnt finding a match because there is no match.
What you need to do is put a 'View Results Tree' on the http sampler that you want to match the regular expression and run the test cycle. When the "mis-match" occurs (the listener will keep a full history of all the pages fetched"), copy the Result Data to a file and then run the exact same regular expression over it using Perl 5.003. The same thing should happen.
If the regular expression works in Perl, then there is cause to investigate to the next level. If it doesnt, then either the page content is not what you are expecting, or you need to revise your regular expression.
BTW, I say Perl 5.003 becuase this is the equivalent regular expression engine that Jmeter uses. If you are not too familiar with Perl, then here is an example program to give you a jump start assuming that you saved the page content as "page.html":
#!/usr/bin/perl
# open file for reading open(IN, "page.html") || die "unable to open file";
# Run through each line looking to match the regular expression # Note that if you use brackets (), the the results will be found # in $1, $2 etc. E.g. $Line =~ /contentId=(\d+)/ then you could # write in the if statement $contentId = $1; while($Line = <IN>) { if($Line =~ /<reg exp here>/) { print "Found Match!"; }
close(IN);
Vladimir Tsygankov wrote:
Hello, friends!
We noticed that JMeter from time to time doesn't calculate regular
expressions in requests for some threads (our test has 20 threads). As a result we receive Exceptions from the server instead of correct
responses. We tried almost everything: increasing of Ramp-Up period,
time delay between requests, priority of java etc. It doesn't help.
We'd like to have a guarantee that a regular expression has been
calculated before a request is sent.
Is there any settings for JMeter or for script to fix the problem?
Thanks in advance,
Vladimir
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