Hi Flavio, when I use asynchronous calls, i won't wait for the callback to issue a new request. Could you tell me the test method you used in your test. What is the CPU utilization rate when the perforance reach the maximum?
On Wed, Mar 9, 2011 at 5:28 PM, Flavio Junqueira <[email protected]> wrote: > How many outstanding requests do you have at a time, Qian? Only one? If so, > you should instead have multiple outstanding. That is, you don't wait for > the callback to issue a new request. > > -Flavio > > On Mar 9, 2011, at 3:44 AM, Qian Ye wrote: > > Hi Flavio, asynchronous calls doesn't perform better, here is some results > we've got, > > § 1 client server，1 process per client server，connect 1 zookeeper > server，all reads：cpu：14%~15%，qps：3833，latency：0.000261 > § 1 client server，1 process per client server，connect all 3 zookeeper > server，all reads：cpu：14%~15%，qps：3832，latency：0.000261 > § 1 client server，10 process per client server，connect all 3 zookeeper > server，all reads，cpu：13%~20%，qps：14000->12000，latency：0.000469 > *§ 1 client server，30 process per client server，connect all 3 zookeeper > server，all reads，cpu：15%~20%，qps：14000->10000，,latency： > § 2 client server，30 process per client server，connect all 3 zookeeper > server，all reads，cpu：15%~20%，qps：about 11000，latency：* > > It seems that the asynchronous calls perform even worse than the > synchronous calls. > > > On Wed, Mar 9, 2011 at 12:29 AM, Flavio Junqueira <[email protected]>wrote: > >> Hi Qian, If I understand your description correctly, you are using >> synchronous calls. To get high throughput values, you need multiple >> outstanding requests, so you will need to use asynchronous calls. >> >> -Flavio >> >> On Mar 8, 2011, at 5:16 PM, Qian Ye wrote: >> >> P.S. 1 we use zookeeper 3.3.2 >> P.S. 2 all our testing process get data from the same znode. The size of >> data on the znode is less than 1K. >> >> On Wed, Mar 9, 2011 at 12:08 AM, Qian Ye <[email protected]> wrote: >> >> Hi all: >> >> >> These days my friend and I did some performance tests on zookeeper. We >> >> found the performance of zookeeper is not as good as it is described in >> the >> >> Zookeeper Overview ( >> >> http://hadoop.apache.org/zookeeper/docs/r3.3.2/zookeeperOver.html) . In >> >> the Zookeeper Overview, the "ZooKeeper Throughput as the Read-Write Ratio >> >> Varies" shows that in a ensemble of 3 Zookeeper server, the throughput can >> >> reach about 80000, if the requests are all reads. However, we cannot get >> >> results like that in our performance test with the synchronized interface, >> >> zkpython. >> >> >> Here is some of our test results: >> >> (3 zookeeper ensemble, 8 core CPU, 2.4GHZ, 16 RAM, Linux 2.6.9) >> >> >> § 1 client server，1 process per client server，connect 1 zookeeper >> >> server，all reads：cpu：8%~9%，qps：2208，latency：0.000453s >> >> § 1 client server，1 process per client server，connect all 3 zookeeper >> >> server，all reads：cpu：8%~9%，qps：2376.241573 ，latency:0.000421s >> >> § 1 client server，1 process per client server，connect all 3 zookeeper >> >> server，all reads，cpu：10%~20%，qps：15600，latency：0.000764s >> >> *§ 1 client server，30 process per client server，connect all 3 zookeeper >> >> server，all reads，cpu：10%~20%，qps：15200，latency：* >> >> *§ 2 client server，30 process **per client server**，connect all 3 >> >> zookeeper server，all reads，cpu：10%~20%，qps：15800，latency：0.003487* >> >> >> qps means "query per second", that is throughput. The result shows that >> >> when adding more client server, the utilization rate of CPU don't >> increase, >> >> and the throughput don't increase much. It seems that the throughput won't >> >> reach 80000, even if we add 28 more client servers to reach the number you >> >> mentioned in the Zookeeper Overview. >> >> >> Maybe I've done the tests wrong. Is there any particular thing I should >> pay >> >> attention to in this case? We set the max java heap size to 12GB in our >> >> test. >> >> >> *Could you tell me the details about how you do the performance test, from >> >> which you get the results showed in the Zookeeper Overview?* >> >> >> -- >> >> With Regards! >> >> >> Ye, Qian >> >> >> >> >> >> -- >> With Regards! >> >> Ye, Qian >> >> >> *flavio* >> *junqueira* >> >> research scientist >> >> [email protected] >> direct +34 93-183-8828 >> >> avinguda diagonal 177, 8th floor, barcelona, 08018, es >> phone (408) 349 3300 fax (408) 349 3301 >> >> >> > > > -- > With Regards! > > Ye, Qian > > > *flavio* > *junqueira* > > research scientist > > [email protected] > direct +34 93-183-8828 > > avinguda diagonal 177, 8th floor, barcelona, 08018, es > phone (408) 349 3300 fax (408) 349 3301 > > > -- With Regards! Ye, Qian
