I tried this as well, but didn't see any improvement. According to the wiki page about preFetch the default is Short.MAX_VALUE-1 for non-persistent topics.
rajdavies wrote: > > You should try increasing the prefetchSize for the network connection > - by default its 1000 - setting it to a higher value should help - > On 7 Oct 2009, at 19:52, nkleinsch wrote: > >> >> Yes, I'm using the ActiveMQ performance module producer. It prints >> back this >> line on startup: >> >> INFO: Creating producer to: topic://topic.work.complete.main.0 with >> non-persistent delivery. >> >> On our application I've also set non-persistent delivery and are >> seeing the >> same performance. >> >> - Nick >> >> >> Joe Fernandez wrote: >>> >>> Are you setting the delivery mode on the publisher to be non- >>> persistent? >>> >>> Joe >>> http://www.ttmsolutions.com >>> >>> >>> nkleinsch wrote: >>>> >>>> Adding some of the things I've tried in case they'd be of help to >>>> other >>>> people in the future. >>>> >>>> - Disabled producer flow control >>>> (http://activemq.apache.org/producer-flow-control.html) - Did >>>> nothing for >>>> client throughput >>>> >>>> - Switched pendingSubscriberPolicy to a VM cursor >>>> (http://activemq.apache.org/message-cursors.html) - Did nothing for >>>> client throughput >>>> >>>> - Tried changing the prefetch limit >>>> (http://activemq.apache.org/what-is-the-prefetch-limit-for.html) - >>>> Did >>>> nothing for client throughput. Given that the default was the max >>>> value >>>> for nonpersistent topics, I didn't think this would do anything, but >>>> tried it just in case. >>>> >>>> - Set Async Sends on the producer >>>> (http://activemq.apache.org/async-sends.html) - Did nothing for >>>> client >>>> throughput. This was also the default, but checked it to make sure. >>>> >>>> Is there anything else I haven't tried here that could help improve >>>> performance? I've read through all the FAQs and performance >>>> documents and >>>> am running out of ideas. >>>> >>>> - Nick >>>> >>>> >>>> nkleinsch wrote: >>>>> >>>>> Hi all, >>>>> >>>>> I'm having throughput issues on ActiveMQ 5.2 and was hoping for >>>>> some >>>>> tips to improve performance. We're sending out messages on a >>>>> topic at an >>>>> average rate of around 150/sec. The messages are object messages >>>>> that >>>>> vary in size, but range up to 5 kilobytes. We're using a network of >>>>> brokers between two sites, with all the producers in one site and >>>>> the >>>>> consumers in the other. We're seeing memory fill up on the >>>>> producing >>>>> site broker and the "messages received" falling behind "messages >>>>> sent", >>>>> implying that we're not able to send them over to the receiving >>>>> side >>>>> broker quickly enough. These messages don't need guaranteed >>>>> delivery, so >>>>> we're not using transactions or durable subscriptions. >>>>> >>>>> I set up a test between the two sites using the ActiveMQ >>>>> Performance >>>>> Module. I'm using a stock ActiveMQ 5.2 and the ActiveMQ Performance >>>>> Module from the latest SVN. I'm running ActiveMQ on a server in >>>>> site 1. >>>>> If I run the producer and consumer on another server in site 1, I >>>>> get a >>>>> system average throughput of 5184. If I run the same test, except >>>>> with >>>>> the client on a similarly configured server in site 2, I get a >>>>> throughput of 112. >>>>> >>>>> The transfer rate between the two servers is upwards of 3 MB/s, >>>>> so I >>>>> assume it isn't a bandwidth limitation. The latency between the two >>>>> sites (measured using ping) is 90ms. Why would latency have such >>>>> a large >>>>> effect on my message throughput rate? Are there any settings I >>>>> could >>>>> change that would help my performance? >>>>> >>>>> Thanks, >>>>> Nick Kleinschmidt >>>>> >>>> >>>> >>> >>> >> >> -- >> View this message in context: >> http://www.nabble.com/Latency-causing-throughput-problems-in-ActiveMQ-5.2-tp25777286p25792204.html >> Sent from the ActiveMQ - User mailing list archive at Nabble.com. >> > > Rob Davies > http://twitter.com/rajdavies > I work here: http://fusesource.com > My Blog: http://rajdavies.blogspot.com/ > I'm writing this: http://www.manning.com/snyder/ > > > > > > > -- View this message in context: http://www.nabble.com/Latency-causing-throughput-problems-in-ActiveMQ-5.2-tp25777286p25863099.html Sent from the ActiveMQ - User mailing list archive at Nabble.com.
