[hibernate-issues] [Hibernate-JIRA] Commented: (HSEARCH-135) Create a RAMDirectoryProvider from an existing Lucene FSDirectory

[ http://opensource.atlassian.com/projects/hibernate/browse/HSEARCH-135?pag... ] Sanne Grinovero commented on HSEARCH-135: ----------------------------------------- Did you try to compare RAMDirectory performance to FSDirectory performance? The filesystem is just slower the first time you have to read a segment/sector, after that the operating system knows some very good tricks about I/O optimization given enough free ram and you don't have to care (much) about memory requirements or have more work for your garbage collector. Also the OS is quite good at giving you transparently the correct version, so avoiding all the mess with flushing and reloading. My tests run on linux, but I think other oses should behave similarly. You can still get "the best of both worlds" with indexreader "warmup", having some query hit most segments in background before returning it to real searchers. Of course, this is only possible if you can somehow prepare the indexreaders beforehand. -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: http://opensource.atlassian.com/projects/hibernate/secure/Administrators.... - For more information on JIRA, see: http://www.atlassian.com/software/jira