Thank you very much everyone for feedback. I did kind of dry run in prod server with 10 parallel threads today each with 2000 facts. CPU usage varied from 60% to 99%. Thompson, as per your suggestion, I also monitored the run queue whose value varied from 4 to 14.
John A Thompson wrote: > > I would not worry about this, especially on solaris. > > You're first test was invalid. You ran on an idle system. The OS is > going > to give the Java process whatever amount of the CPU it needs to complete > its > work. On an idle system, there is nothing competing for the CPU. In this > scenario, a very simple process will chew up CPU. If you don't believe > me, > create an app that adds .00001 in a loop until it reaches a billion. > You'll > see this process get all kinds of CPU, but will yield to other > applications > when it needs to. > > By this - "while I was doing this, Other apps contacted me about this and > showed their > concern too." I assume you mean people contacted you that saw the CPU was > high? Did they have any indication their apps slowing down? Probably not. > > Solaris does a real nice job of managing system resources. I've freaked > out > our operations guys by running systems at 100% more than once. ;-) I had > the boxes doing a lot of work, but not thrashing the CPU. > > Learn to use vmstat and monitor the run queue. Generally, if this is not > getting over 1 or 2, you're fine. > > > On Wed, Mar 25, 2009 at 7:16 AM, techy <[email protected]> wrote: > >> >> Thanks for your valuable input. >> >> I did further testing in TEST solaris machine where other apps too are >> running. >> >> 1.In the consumer, I launched 5-10 threads of parallel execution with >> drools >> stateless session. It did performed well with more cpu usage. it >> maintained >> avg cpu usage of 65-70%. occasional spikes went to 85-90%. >> while I was doing this, Other apps contacted me about this and showed >> their >> concern too. >> >> So this brings up another question. Will drools high cpu usage degrade >> other app performance when they are running in same machine & same time? >> >> Thanks again! >> >> >> nheron wrote: >> > >> > Hello, >> > Yes, when running drools, the cpu usages goes high. >> > It is one of the main caracteristic with rule engine : the more cpu you >> > have the quickler it is !! >> > It is normal because all the rete graph & Co are in ram and drools work >> > on it. >> > So there is not wait for database, IO and co so CPU goes very high very >> > quicly but is is normal ! >> > All my customers have this surprise : a 4 CPU machine instead one one >> > makes it able to have 4 concurrent drools sessions to work in parallele >> > with the same performance as one session on one CPU ! >> > Regards >> > Nicolas Heron >> > >> > Regards >> > Nicolas >> > Le mercredi 25 mars 2009 à 10:05 +0100, Wolfgang Laun a écrit : >> > >> >> The figures you gave just indicate that you have a good balance >> >> between I/O >> >> and CPU load. The increase between "no rules" and "~60 rules" is to be >> >> expected >> >> as all the work is being done during fact insertion. Of course, adding >> >> more and >> >> more rules will, eventually, push the CPU load factor to the natural >> >> upper limit. >> >> >> >> If the overall throughput is good, why do you worry? >> >> >> >> -W >> >> >> >> >> >> >> >> On Tue, Mar 24, 2009 at 11:20 PM, techy <[email protected]> >> >> wrote: >> >> >> >> >> >> Hello >> >> My app is functioning consumer/producer model. >> >> 1.Producer reads the data from DB and inserts to blocking >> >> queue >> >> 2.Consumer reads the data from queue and execute the rules >> >> using drools >> >> stateless session. >> >> Both producer and consumer run asynchronously. >> >> >> >> in my testing I found the following >> >> >> >> 1. for 1000 facts at a time and no rules in drl, cpu usage is >> >> maintained at >> >> 25-30% in my PC(Intel core 2 CPU,2.13 GH,2G RAM) - with no >> >> rules in drl, Is >> >> this cpu usage acceptable? >> >> 2. for 1000 facts at a time and ~60 rules in drl, cpu usage is >> >> maintained at >> >> 50-60% on the same PC. >> >> 3. If I have 1 sec wait between each execution of rules in >> >> consumer, then >> >> cpu usage is maintained < 5% >> >> >> >> high CPU usage is being big concern to me. Is this expected >> >> while using >> >> drools? Do others see same cpu usage too? Please share your >> >> thoughts. >> >> appreciate your input. >> >> >> >> Thanks >> >> >> >> -- >> >> View this message in context: >> >> http://www.nabble.com/high-cpu-usage-tp22691131p22691131.html >> >> Sent from the drools - user mailing list archive at >> >> Nabble.com. >> >> >> >> _______________________________________________ >> >> rules-users mailing list >> >> [email protected] >> >> https://lists.jboss.org/mailman/listinfo/rules-users >> >> >> >> >> >> >> >> _______________________________________________ >> >> rules-users mailing list >> >> [email protected] >> >> https://lists.jboss.org/mailman/listinfo/rules-users >> > >> > _______________________________________________ >> > rules-users mailing list >> > [email protected] >> > https://lists.jboss.org/mailman/listinfo/rules-users >> > >> > >> >> -- >> View this message in context: >> http://www.nabble.com/high-cpu-usage-tp22691131p22699498.html >> Sent from the drools - user mailing list archive at Nabble.com. >> >> >> _______________________________________________ >> rules-users mailing list >> [email protected] >> https://lists.jboss.org/mailman/listinfo/rules-users >> > > _______________________________________________ > rules-users mailing list > [email protected] > https://lists.jboss.org/mailman/listinfo/rules-users > > -- View this message in context: http://www.nabble.com/high-cpu-usage-tp22691131p22710416.html Sent from the drools - user mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list [email protected] https://lists.jboss.org/mailman/listinfo/rules-users
