Re: Creating objects in the database
"Khayundi, Peter" <[email protected]>
| Newsgroups | gmane.comp.java.prevayler |
|---|---|
| Message-ID | <9CFD87226CD8CB4AB60D9951BD74A2B201C7CB52@AL-TSC-CL01-EX.ufh-domain.local> |
Hi William, Thanks for the reply to my query. About the IO, I have ensured that there is no other unnecessary process running on the machine during the operation. And also, about the second problem, I increased the Java heap size to 512MB which should be more than adequate for this operation. Any other ideas that I may try? Peter. From: William Pietri [mailto:[email protected]] Sent: Friday, February 06, 2009 7:24 PM To: Open discussion about the Prevayler project. Subject: Re: [Prevayler-discussion] Creating objects in the database Khayundi, Peter wrote: I am doing some timings with the Prevayler database. I inserted 20000 items into the database and timed this operation. The experiment was repeated 10 times. The resulting times differ widely and have a high standard deviation. Does anybody have an explanation as to why the same experiment should have such widely different timings? Hi, Peter. My first two guesses: other IO on the same disk and Java garbage collection. You can reduce problems with the first by using a separate disk, and with the latter by giving Java lots more RAM than necessary. There are also assorted tunings you can do, but those depend on OS and JDK version. William -- William Pietri - [email protected] - +1-415-643-1024 Agile consulting, coaching, and development: http://www.scissor.com/ We'd love feedback on our new blog: http://agilefocus.com/ The University of Fort Hare subscribes to an e-mail disclaimer. Please click on the following URL to read further: http://www.ufh.ac.za/disclaimer/ ------------------------------------------------------------------------------ Create and Deploy Rich Internet Apps outside the browser with Adobe(R)AIR(TM) software. With Adobe AIR, Ajax developers can use existing skills and code to build responsive, highly engaging applications that combine the power of local resources and data with the reach of the web. Download the Adobe AIR SDK and Ajax docs to start building applications today-http://p.sf.net/sfu/adobe-com _______________________________________________ To unsubscribe go to the end of this page: http://lists.sourceforge.net/lists/listinfo/prevayler-discussion _______________________________________________ "Databases in Memoriam" -- http://www.prevayler.org