Hi Kaya, Can you tell more about your setup? Are you using SolrCloud (with how many shards and replicas)? Since the inter communications between nodes are using HTTP/2 as default now.
On Sun, 19 May 2019 at 07:29, Kayak28 <kaya.ota....@gmail.com> wrote: > Hello, Apache Solr community members: > > I have a few questions about the load test of Solr8. > > - for Solr8, optimization command merge segment to 2, but not 1. > Is that ok behavior? > When indexing Wikipedia data, Solr8 generated multiple segments. > So, I executed <optimize /> command from the Admin UI. > Solr8 did reduce the number of segments, but it left two segments. > Hence, I wonder if it is ok behavior or it is weird. > > > > - in a certain situation (explained below), Solr8 (without the use of > http/2 and block-max WAND algorithm) is faster then Solr7.4.0. What are the > considerable causes of this performance improvement? Or did I plan > load-test badly? > > Here is the story I came up with these questions. > I performed a simple load test on Solr8 to observe the difference in > performance. > So, I wondered how fast it became, comparing to Solr7.4.0, which is the > version I currently use. > > My testing environment is below: > OS: Ubuntu 16.04 > Vendor: DELL PowerEdge T410 > CPU:Intel(R) Xeon(R) CPU E5620 @2.40 GHz 8 Core > Memory: 16GB > Hard Disk: 3.5 Inch SATA (7,200 rpm): 500 GB > > The data is from the Japanese Wikipedia dump. > > By indexing them, both versions of Solrs store 2'366'754 documents, which > the index size and JVM memory are 8.48 GB and 8GB accordingly. > > In order to perform several times of load-tests, only fieldValueCache and > fieldCache are working; other Solr's caches are turned off. > > I use Jmeter(5.1.1) to measure average response time and throughput. > I know Jmeter only sends HTTP/1 requests, without a plugin. (and I did not > use the plugin) > So, this result should not be affected by HTTP/2. > > Also, according to a JIRA ( > https://issues.apache.org/jira/browse/SOLR-13289 ). > Solr8 has not supported block-max WAND algorithm yet, so again this result > should not be affected by the algorithm, which makes Lucene faster. > > The results from Jmeter is attached as a PDF file. > > According to these results, Solr8 is somehow superior then Solr7.4.0. > > But, I have no idea what are the considerable causes of this difference. > Does anyone have any idea about this? > > > Sincerely, > Kaya Ota > -- *Best regards,* *Cao Mạnh Đạt* *D.O.B : 31-07-1991Cell: (+84) 946.328.329E-mail: caomanhdat...@gmail.com <caomanhdat...@gmail.com>*
