lucene - Need to know pros and cons of using RAMDirectory -

-

I need to improve the performance of my Lucene search query. Can I use the Ramdirectory? Does it optimize performance? Is there any index size limit in this? I appreciate if anyone can list the professional and the opposition to use the RAM directory.

Thank you.

I compare the FS directory and the RAM directory.

  • Index size 1.4G
  • Centos, 5G memory

Search 1000 keywords, average / minimum / Maximum response time (MS) is here

  • FS directory
    • First run: 351/7/2611
    • Second run: 47/7/837
    • The third part (restart the app): 53/7/2343
  • RAM directory
    • First run: 38 /
    • Second run: 34/7/18 9
    • Third part (resume app): 38/7/9 5
    < / Li>

So, you can see that the RAM directory is faster than FS Dye Ectori, but after the OS file cache warm-up, the speed difference is not that much different. What is the disadvantage of RMDadiri? In my test

  • It eats more memory, 1.4G files need to be loaded in memory about 2G. While the FS directory uses only 700 meters, then it takes a long time for its full meaning.
  • More time is needed to load it, especially when the index file is large, when the index is opened, data needs to be copied into memory, it means that during the restart of the app more Request for time will be blocked.
  • It is not so practical to maintain two indexes at the same time. Since our app switches indices every few hours. We want the new index to get hot, while the old index is still working in the same tomcat.

Comments

Post a Comment

Popular posts from this blog

asp.net - Javascript/DOM Why is does my form not support submit()? -

-
This is my first time working with asp.net and javascript, so I do not know very good web resources, or Much about javascript debugging I have to find out that on line oFormObject.submit (); Microsoft JScript Runtime Error: Object does not support this property or method I am using the link to work as a button because I am terrible in aesthetics and I think That link will look more professional than a table of 50 buttons. I have read that this solution can cause problems with browsers due to pre-rendering of my links and many additional traffic and problems, but CSS gives me a button like a link, which has issues of alignment and difference seemed to. & lt ;! DOCTYPE HTML PUBLIC "- // W3C // DTD HTML 4.01 // N" "http://www.w3.org/TR/html4/strict.dtd"> & Lt; Html xmlns = "http://www.w3.org/1999/xhtml" & gt; & Lt; Head & gt; & Lt; Link rel = "stylesheet" type = "text / css" href = "defect differen
Read more

sockets - Delphi: TTcpServer, connection reset when reading -

-
I am trying to implement one for Delphi, but there are some problems with communication. Fitnesse will start my process, and give me a portmember as a command line argument. Then I should make a socket on the port number given to me, and fitness will connect to that port I am using a TCPCP server for the job: < Pre> TcpServer1.LocalPort: = ParamStr (ParamCount); TcpServer1 Active: = true; On OnEXEPT () -Event, I send the protocol version to use as specified in the protocol. Process TForm1.TcpServer1Accept (From: TOBject; ClientSocket: TCustomIpClient); Var s: ansistring; Start clientSocket. Syndrome ('slim - v 0.0', # 10); SetLength (S, 6); ClientSketts Receavebook (S, 6); End; When I call ReceiveBuf (), the process ends, and fitness throws an exception: java.net.SocketException: connection Reset I have seen what sent and received. It shows that my code sends the protocol version, fitness sends back a message, and when I try to get this message
Read more

javascript - Classic ASP "ExecuteGlobal" statement acting differently on two servers -

-
I have a strange problem that I really do not know. In addition to developing a new ASP.NET site, I have to support the old "classic ASP" site. It is written in VBScript with a batch of JavaScript functions. Many of the JavaScript functions include 'files' Everything is fine on our production system (which security is controlled by another group - this is a military installation) Debugging them once did not work I). However, I have a fix for a vague bug that needs to be fully tested and some functions do not run under the "local" copy of the website that runs on my PC. For the record, I am running IIS 5.1 on XP. The problem is that some Javascript functions are running "OK" on the production server, but when they use it as a server, they are not defined on my PC what is happening that last Programmer, for some reason, has decided to put some functions in a series of files, which according to the observations, imitate the "need_once
Read more