How many processors do you have on this system? If you are CPU bound, 100 threads is going to be 10 times slower (at a minimum) than 10 threads (unless you have more than 10 CPUs).
-Yonik http://www.lucidimagination.com On Fri, Oct 23, 2009 at 2:18 AM, Wilson Wu <songzi0...@gmail.com> wrote: > Dear Friend, > I have encountered some performance problems recently in lucene > search 2.9. I use a single IndexSearcher in the whole system, It seems > perfect when there is less than 10 threads doing search concurrenty. > Bu if there is more than 100 threads doing concurrent search,the > average response time is becoming bigger(>1s),and the max response > time reaches 299s. I really don't know how to improve,can you help me? > Thanks a lot ! > > Wilson > 2009.10.23 > The profiling result about 400 concurret search is at: > http://i3.6.cn/cvbnm/aa/f5/00/63521d982a469f5063b82268eee91d08.gif > it seems a lot of time consumed by TermScorer.score. > Follewing is my servlet class which is reponse to search request: > public final class DispatchServlet extends > javax.servlet.http.HttpServlet implements javax.servlet.Servlet > { > private static final long serialVersionUID = -5547647006004900451L; > protected final Log log = LogFactory.getLog(getClass()); > protected Searcher searcher; > protected Directory dir; > protected RAMDirectory ram; > > public DispatchServlet() { > super(); > } > > public void init() throws ServletException { > super.init(); > try { > > dir = FSDirectory.open(new > File("/usr/bestv/search_engin_index/index/program")); > ram = new RAMDirectory(dir); > searcher = new IndexSearcher(ram,true); > int h = searcher.search(tq,null,1).totalHits; > System.out.println("the searcher has warmed and > searched " + h + " docs" ); > } > } catch (IOException e) { > log.error(e); > } > } > > protected void doPost(HttpServletRequest request, HttpServletResponse > response) throws ServletException, IOException { > response.setContentType("text/html"); > doExecute(request.getParameter("q"),response); > } > > protected void doGet(HttpServletRequest request, HttpServletResponse > response) throws ServletException, IOException { > response.setContentType("text/html"); > try{ > String schCon = > URLDecoder.decode(request.getParameter("q"),"UTF-8"); > doExecute(schCon,response); > }catch(Exception e){ > response.getWriter().write("Parameter > Error,please send param 'q'"); > } > } > > public void doExecute(String schCon,HttpServletResponse response) > throws ServletException,IOException{ > response.getWriter().write(new > SearchCommand().search(searcher)); > } > > } > > --------------------------------------------------------------------- > To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org > For additional commands, e-mail: java-user-h...@lucene.apache.org > > --------------------------------------------------------------------- To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org For additional commands, e-mail: java-user-h...@lucene.apache.org
