its possible that you can get socket exceptions because your client is overloaded right?
On Fri, Sep 11, 2009 at 4:14 PM, sebb <[email protected]> wrote: > On 12/09/2009, alongir <[email protected]> wrote: > > > > Hi. > > > > This can happen due to overloading your JMeter instances. > > Sorry, what can happen when overloading JMeter? > > If you are referring to connection refused, then this is generated by > the server, not JMeter. > I don't see how JMeter being overloaded can cause this - if anything, > an overloaded JMeter will generate less load. > > > I'm not sure I am > > referring to the right exceptions code, however, I did encounter such > > experience when I tried to ask too much of my JMeter instances in a > > distributed environment. > > > > If you want to isolate the problem, I can supply you with multiple > JMeter > > instances already configured. You can try it with let's say 6 strong > > machines running a small to medium load and see if the problems is > solved. > > > > Take a look at my website, it's http://www.cloud-intelligence.com/load > > http://www.cloud-intelligence.com/load . If you think this can solve > > anything for you, I can create a temporary account and let you test it. > > > > Best, > > Alon. > > > > > > > > sebb-2-2 wrote: > > > > > > On 11/09/2009, Jakub Białek <[email protected]> wrote: > > >> Obviously JMeter supports much more than 30 threads. But if you use > > >> JMeter to simulate e.g. 200 concurrent users to check load and > > >> response time of your application then you can use e.g.: > > >> - 1 jmeter instance with 200 threads or > > >> - 2 jmeter instances with 100 threads each or > > >> - 4 jmeter instances with 50 threads each or > > >> - 8 jmeter instances with 25 threads each > > >> ...... > > >> The last solution is the best if you want simulate real load that > can > > >> be generated by 200 real users. The first solution is the worst. > I'll > > >> explain it below. > > >> Let's assume that you have 1 core CPU. Some facts: > > >> - at the moment on your cpu can run only one process/thread to > > >> simulate multitasking OS gives small amount of time to each > > >> process/thread and changes the process/thread context > > >> - changing/switching process cost several cpu cycles because cpu > > >> registers have to be filled with corresponding data > > >> - changing/switching thread is cheaper > > >> - not only jmeter runs on your machine also many other > > >> application/process bounded to the OS, so jmeter is often dispossess > > >> and waiting for cpu cycles > > >> - not only workers threads of jmeter runs, also other java threads > > >> e.g. GCThread, all those threads compete for cpu > > >> - when one thread/process is running others are sleeping/waiting > > >> - process/thread can by disposed at any time of execution > > > > > > These are all true, but: > > > > > >> Conclusion: > > >> - 200 jmeter threads don't mean 200 concurrent users, load generated > > >> by those jmeter instances will be much less than this by 200 > > >> concurrent real users > > > > > > That's not a valid conclusion unless JMeter is running out of CPU. > > > > > > In general, a single JMeter thread can generate *more* load than a > > > single user, because it can send requests much faster than a human. > > > > > >> - more jmeter threads more time spent on switching context, less > time > > >> used by jmeter worker threads > > >> - any worker thread can be disposed (and wait when rest 199 threads > > >> will take their cpu time) after receiving answer from server but > > >> before calculate time that call to server took so this time will be > > >> incorrect > > >> > > >> So if your goal is to simulate as good as possible load generated by > > >> many users then use so much jmeter instances (computers) as you can > > >> with as less as possible threads on each jmeter instance. Otherwise > > >> your results can be far from reality and you can be surprised why > your > > >> application can't handle with those users even though jmeter stress > > >> tests passed. > > > > > > Again, I disagree with this. > > > > > >> If someone is interested in comparison how performance of my > > >> application changes depending on jmeter configuration (number of > > >> threads and number of instances) I can do that test. I have 10 > servers > > >> with 2 CPU each and each CPU with 4 core. Those servers can be used > as > > >> a JMeter clients. > > >> > > >> > > >> Best regards, > > >> Jakub > > >> > > >> > > >> W dniu 11 września 2009 15:54 użytkownik sebb <[email protected]> > > >> napisał: > > >> > > >> > On 11/09/2009, Jakub Białek <[email protected]> wrote: > > >> >> How about tomcat is it on linux or windows machine? Make sure > that OS > > >> >> doesn't limit the max number of inbound connection. > > >> >> > > >> >> Jakub > > >> >> > > >> >> BTW. I think that 200 thread on 1 jmeter instance are to many if > you > > >> >> don't have cpus that support 64 threads simultaneously ;) . I > > >> usually > > >> >> use no more than 50 on 8 core system. > > >> >> > > >> > > > >> > A single JMeter instance can support many more than 50 threads, > > >> > depending on the test plan. > > >> > > > >> >> > > >> >> 2009/9/11 Mytho Logic <[email protected]>: > > >> >> > Hi, > > >> >> > > > >> >> > I tried with 550 threads in tomcat for 500 concurrent users. > But > > >> not > > >> >> > succeed. > > >> >> > > > >> >> > Jmeter Client:- > > >> >> > System: Windows XP Professional Verison 2002 SP2 > > >> >> > Computer: Intel(R) Core(TM)2 CPU 6300 @ 1.86 Ghz 1.86 GHz, > 1.97 GB > > >> of RAM > > >> >> > > > >> >> > Jmeter Server:- > > >> >> > System: Windows XP Professional x64 Edition Verison 2003 SP2 > > >> >> > Computer: Intel(R) Xeon(R) CPU 5130 @ 2.00 Ghz 2.00 GHz, 8.00 > GB > > >> of RAM > > >> >> > > > >> >> > Thanks > > >> >> > Maumita > > >> >> > > > >> >> > > > >> >> > 2009/9/11 Jakub Białek <[email protected]> > > >> >> > > > >> >> >> If you have 500 (truly) concurrent users then you need at > least > > >> 500 > > >> >> >> threads in tomcat, try with 550 thread. > > >> >> >> > > >> >> >> You run jmeter on windows or linux os? > > >> >> >> > > >> >> >> Best regards, > > >> >> >> Jakub > > >> >> >> > > >> >> >> 2009/9/11 Mytho Logic <[email protected]>: > > >> >> >> > Hi, > > >> >> >> > > > >> >> >> > I changed the maxthreads limit in tomcat server.xml to 400 > and > > >> tried the > > >> >> >> > same testplan again..but few sample requests gets failed > and > > >> throws > > >> >> >> > exception. > > >> >> >> > what should I do to solve the problem. > > >> >> >> > > > >> >> >> > Exception:- > > >> >> >> > > > >> >> >> > java.net.ConnectException: Connection refused: connect > > >> >> >> > at java.net.PlainSocketImpl.socketConnect(Native Method) > > >> >> >> > at > > >> java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:333) > > >> >> >> > at > > >> java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:195) > > >> >> >> > at > > >> java.net.PlainSocketImpl.connect(PlainSocketImpl.java:182) > > >> >> >> > at java.net.Socket.connect(Socket.java:519) > > >> >> >> > at java.net.Socket.connect(Socket.java:469) > > >> >> >> > at > sun.net.NetworkClient.doConnect(NetworkClient.java:157) > > >> >> >> > at > > >> sun.net.www.http.HttpClient.openServer(HttpClient.java:382) > > >> >> >> > at > > >> sun.net.www.http.HttpClient.openServer(HttpClient.java:494) > > >> >> >> > at > sun.net.www.http.HttpClient.<init>(HttpClient.java:231) > > >> >> >> > at sun.net.www.http.HttpClient.New(HttpClient.java:304) > > >> >> >> > at sun.net.www.http.HttpClient.New(HttpClient.java:316) > > >> >> >> > at > > >> >> >> > > > >> >> >> > > >> > sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:817) > > >> >> >> > at > > >> >> >> > > > >> >> >> > > >> > sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:769) > > >> >> >> > at > > >> >> >> > > > >> >> >> > > >> > sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:694) > > >> >> >> > at > > >> >> >> > > > >> >> >> > > >> > org.apache.jmeter.protocol.http.sampler.HTTPSampler.sample(HTTPSampler.java:431) > > >> >> >> > at > > >> >> >> > > > >> >> >> > > >> > org.apache.jmeter.protocol.http.sampler.HTTPSamplerBase.sample(HTTPSamplerBase.java:1021) > > >> >> >> > at > > >> >> >> > > > >> >> >> > > >> > org.apache.jmeter.protocol.http.sampler.HTTPSamplerBase.sample(HTTPSamplerBase.java:1007) > > >> >> >> > at > > >> org.apache.jmeter.threads.JMeterThread.run(JMeterThread.java:290) > > >> >> >> > at java.lang.Thread.run(Thread.java:595) > > >> >> >> > > > >> >> >> > Thanks > > >> >> >> > Maumita > > >> >> >> > > > >> >> >> > > > >> >> >> > On Fri, Sep 11, 2009 at 3:07 PM, sebb <[email protected]> > wrote: > > >> >> >> > > > >> >> >> >> On 11/09/2009, Mytho Logic <[email protected]> > wrote: > > >> >> >> >> > Hi, > > >> >> >> >> > > > >> >> >> >> > In tomcat server.xml, I changed the maxtheads limit to > 300 > > >> and kept > > >> >> >> >> > JAVA_OPTS=-Xms512m -Xmx1024m > > >> >> >> >> > > > >> >> >> >> > But not succeed.I am getting same > > >> "java.net.ConnectException: > > >> >> >> Connection > > >> >> >> >> > refused: connect" exception. Am I missing anything to > > >> change in > > >> >> >> >> server.xml > > >> >> >> >> > file. > > >> >> >> >> > The machine on which tomcat server is running has 2 GB > RAM. > > >> >> >> >> > > > >> >> >> >> > Please help on this. > > >> >> >> >> > > >> >> >> >> This appears to be a Tomcat configuaration issue. > > >> >> >> >> > > >> >> >> >> Read the Tomcat documentation carefully, and if that does > not > > >> answer > > >> >> >> >> your query, then post a question on the Tomcat user list. > > >> >> >> >> > > >> >> >> >> > Thanks > > >> >> >> >> > Maumita > > >> >> >> >> > > > >> >> >> >> > > > >> >> >> >> > On Fri, Sep 11, 2009 at 10:15 AM, Deepak Shetty > > >> <[email protected]> > > >> >> >> >> wrote: > > >> >> >> >> > > > >> >> >> >> > > Hi > > >> >> >> >> > > > http://tomcat.apache.org/tomcat-5.5-doc/config/http.html > > >> >> >> >> > > There are three thread related properties in > server.xml . > > >> You seem > > >> >> >> to > > >> >> >> >> have > > >> >> >> >> > > run into maxThreads limit > > >> >> >> >> > > Note that if your server cant handle the load that is > a > > >> server/OS > > >> >> >> >> problem , > > >> >> >> >> > > you are more likely to get help on a tomcat forum. > Jmeter > > >> is > > >> >> >> >> generating the > > >> >> >> >> > > load correctly. > > >> >> >> >> > > regards > > >> >> >> >> > > deepak > > >> >> >> >> > > > > >> >> >> >> > > On Thu, Sep 10, 2009 at 9:38 PM, Mytho Logic < > > >> >> >> >> [email protected] > > >> >> >> >> > > >wrote: > > >> >> >> >> > > > > >> >> >> >> > > > Hi, > > >> >> >> >> > > > > > >> >> >> >> > > > I am using jmeter version 2.3.2. > > >> >> >> >> > > > To test my application for 200 concurrent users I > have > > >> used > > >> >> >> >> distibuted > > >> >> >> >> > > > testing set up. > > >> >> >> >> > > > It works fine for 200 users. > > >> >> >> >> > > > The test plan was - > > >> >> >> >> > > > 1. 200 concurrent users will first hit the home > page > > >> >> >> >> > > > 2. After that 200 concurrent users will hit the > > >> products page > > >> >> >> >> > > > 3. After that 200 concurrent users will hit the > product > > >> Detail > > >> >> >> page > > >> >> >> >> > > > > > >> >> >> >> > > > For concurrent user setup I have used > 'Synchronizing > > >> Timer' above > > >> >> >> >> the > > >> >> >> >> > > > thread > > >> >> >> >> > > > groups and mentioned 200. > > >> >> >> >> > > > It works fine and I got the result. > > >> >> >> >> > > > > > >> >> >> >> > > > Setup:- > > >> >> >> >> > > > > > >> >> >> >> > > > Tomcat server, Jmeter client and Jmeter server all > are > > >> in 3 > > >> >> >> >> different > > >> >> >> >> > > > machine. > > >> >> >> >> > > > > > >> >> >> >> > > > Tomcat Server > > >> >> >> >> > > > ------------- > > >> >> >> >> > > > JAVA_OPTS=-Xms1024m -Xmx1024m > > >> >> >> >> > > > > > >> >> >> >> > > > Jmeter Client > > >> >> >> >> > > > ------------- > > >> >> >> >> > > > HEAP=-Xms512m -Xmx1024m > > >> >> >> >> > > > > > >> >> >> >> > > > Jmeter Server > > >> >> >> >> > > > ------------- > > >> >> >> >> > > > HEAP=-Xms512m -Xmx4096m > > >> >> >> >> > > > > > >> >> >> >> > > > Using the same configuration and same setup,when i > > >> tried for 220 > > >> >> >> >> > > concurrent > > >> >> >> >> > > > users for few few sample requests I got > > >> >> >> >> > > > "java.net.ConnectException: Connection refused: > > >> connect: > > >> >> >> exception. > > >> >> >> >> > > > Sometime I succeded for 220 concurrent users > without > > >> any > > >> >> >> errors.But > > >> >> >> >> next > > >> >> >> >> > > > time whne I again run the test plan for > > >> >> >> >> > > > 220 concurrent users I got exception. > > >> >> >> >> > > > > > >> >> >> >> > > > What is the reason behind this exception and how > can I > > >> solve > > >> >> >> this? > > >> >> >> >> > > > I need to load my application upto 500 concurrent > > >> users. Please > > >> >> >> >> suggesst > > >> >> >> >> > > > how > > >> >> >> >> > > > can I do this? > > >> >> >> >> > > > > > >> >> >> >> > > > This is an urgent requirement. > > >> >> >> >> > > > > > >> >> >> >> > > > Thanks > > >> >> >> >> > > > Maumita > > >> >> >> >> > > > > > >> >> >> >> > > > > >> >> >> >> > > > >> >> >> >> > > >> >> >> >> > > >> --------------------------------------------------------------------- > > >> >> >> >> To unsubscribe, e-mail: > > >> [email protected] > > >> >> >> >> For additional commands, e-mail: > > >> [email protected] > > >> >> >> >> > > >> >> >> >> > > >> >> >> > > > >> >> >> > > >> >> >> > > >> --------------------------------------------------------------------- > > >> >> >> To unsubscribe, e-mail: > > >> [email protected] > > >> >> >> For additional commands, e-mail: > > >> [email protected] > > >> >> >> > > >> >> >> > > >> >> > > > >> >> > > >> >> > > >> --------------------------------------------------------------------- > > >> >> To unsubscribe, e-mail: > [email protected] > > >> >> For additional commands, e-mail: > [email protected] > > >> >> > > >> >> > > >> > > > >> > > --------------------------------------------------------------------- > > >> > To unsubscribe, e-mail: > [email protected] > > >> > For additional commands, e-mail: > [email protected] > > >> > > > >> > > > >> > > >> > --------------------------------------------------------------------- > > >> To unsubscribe, e-mail: [email protected] > > >> For additional commands, e-mail: > [email protected] > > >> > > >> > > > > > > --------------------------------------------------------------------- > > > To unsubscribe, e-mail: [email protected] > > > For additional commands, e-mail: [email protected] > > > > > > > > > > > > > -- > > > > View this message in context: > http://www.nabble.com/Need-help-to-load-application-using-500-concurrent-users-tp25394934p25409633.html > > Sent from the JMeter - User mailing list archive at Nabble.com. > > > > > > > > --------------------------------------------------------------------- > > To unsubscribe, e-mail: [email protected] > > For additional commands, e-mail: [email protected] > > > > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [email protected] > For additional commands, e-mail: [email protected] > >
