I set it to 10ms and it did fix cpu consumption problem but i don't see any messages coming up in consumer queue
On Wed, Apr 15, 2015 at 1:57 PM, Evan Huus <evan.h...@shopify.com> wrote: > The field is a time.Duration (https://golang.org/pkg/time/#Duration) and > it > is the maximum duration to buffer messages before triggering a flush to the > broker. The default was 1 millisecond (this value does not even exist in > the most recent release). Setting it to higher values trades off latency > for efficiency, whatever your use case dictates. > > Evan > > On Wed, Apr 15, 2015 at 1:47 PM, Victor L <vlyamt...@gmail.com> wrote: > > > I inherited this code, it just set to 1000, what would be reasonable > time: > > 1000 * time.Millisecond? > > > > On Wed, Apr 15, 2015 at 1:41 PM, Evan Huus <evan.h...@shopify.com> > wrote: > > > > > On Wed, Apr 15, 2015 at 1:33 PM, Victor L <vlyamt...@gmail.com> wrote: > > > > > > > Hi Evan, > > > > It's hardcoded: > > > > MaxBufferTime = 1000 > > > > > > > > > > Without any units this defaults to nanoseconds, which means your timer > is > > > spinning every microsecond. You probably mean 1000 * time.Millisecond? > > > > > > > > > > MaxBufferedBytes = 1024 > > > > > > > > How's it versioned? Should i just download zip file from project > > github? > > > > > > > > > > By default go will use whatever version you originally checked out with > > `go > > > get` or the like. You can use a properly versioned copy via > > > http://gopkg.in/Shopify/sarama.v1. > > > > > > > > > > On Wed, Apr 15, 2015 at 12:48 PM, Evan Huus <evan.h...@shopify.com> > > > > wrote: > > > > > > > > > Hi Victor, two points: > > > > > > > > > > - Based on the backtrace, you are using a very old version of > Sarama. > > > You > > > > > might have better luck using a more recent stable version. > > > > > - Are you setting `MaxBufferTime` in the configuration to 0 or a > very > > > > small > > > > > value? If so the loop will spin on that timer. Try making this > value > > > > > larger. > > > > > > > > > > Evan > > > > > > > > > > On Wed, Apr 15, 2015 at 12:35 PM, Victor L <vlyamt...@gmail.com> > > > wrote: > > > > > > > > > > > I am using sarama "golang" kafka 1.8.1 client ( > > > > > > https://github.com/Shopify/sarama) to send messages to message > > > queue > > > > > once > > > > > > in 3secs and this task drives cpu consumption to 130% on the > > quad-cpu > > > > > > blade; The number stays this high regardless of number of > > > > > > partitions/consumers.... According to results of profiling with > > > > 'pprof', > > > > > > most of the cycles are spent in producer.go/NewBrokerProducer; > > > > > > Total: 47297 samples > > > > > > 5947 12.6% 12.6% 15013 31.7% selectgo > > > > > > 3617 7.6% 20.2% 3617 7.6% runtime.xchg > > > > > > 2819 6.0% 26.2% 28506 60.3% > > > > > github.com/Shopify/sarama.func·008 > <http://github.com/Shopify/sarama.func%C2%B7008> > > <http://github.com/Shopify/sarama.func%C2%B7008> > > > <http://github.com/Shopify/sarama.func%C2%B7008> > > > > <http://github.com/Shopify/sarama.func%C2%B7008> > > > > > <http://github.com/Shopify/sarama.func%C2%B7008> > > > > > > <http://github.com/Shopify/sarama.func%C2%B7008> > > > > > > <http://github.com/Shopify/sarama.func%C2%B7008> > > > > > > > > > ---------------------------------------------------------------------- > > > > > > NewBrokerProducer > > > > > > ----------------------------------------------------------- > > > > > > 229: go func() { > > > > > > . . 230: timer := > > > > > time.NewTimer(p.config.MaxBufferTime) > > > > > > . . 231: var shutdownRequired bool > > > > > > . . 232: wg.Done() > > > > > > . . 233: for { > > > > > > 208 17598 234: select { > > > > > > 153 749 235: case <-bp.flushNow: > > > > > > . . 236: if shutdownRequired = > > > bp.flush(p); > > > > > > shutdownRequired { > > > > > > . . 237: goto shutdown > > > > > > . . 238: } > > > > > > 2230 3144 239: case <-timer.C: > > > > > > 144 3606 240: if shutdownRequired = > > > > > > bp.flushIfAnyMessages(p); shutdownRequired { > > > > > > . . 241: goto shutdown > > > > > > > > > > > > > > > > > > wonder if there's some known issue with this method or if anyone > > > > already > > > > > > seen it before... > > > > > > Thank you, > > > > > > > > > > > > > > > > > > > > >
