Well, caching is designed to use memory. If you are saying that you haven't got enough memory to cache all your values then caching them all isn't going to work, at any level. If you implemented your own cache you could control memory usage with an LRU algorithm or whatever made sense for your application. We use an array as the cache with the lucene document id as the index, so don't have to store document vs field mapping.
I'm not aware of any way to tell lucene to cache documents, let alone up to a user-supplied memory threshold. If you are on a unix type OS and your lucene app is the only or main thing on the machine, the OS is likely using the spare memory as cache behind the scenes. Don't know if the same applies to MS Win. -- Ian. On Wed, Mar 26, 2008 at 12:51 PM, Shailendra Mudgal <[EMAIL PROTECTED]> wrote: > > The bottom line is that reading fields from docs is expensive. > > FieldCache will, I believe, load fields for all documents but only > > once - so the second and subsequent times it will be fast. Even > > without using a cache it is likely that things will speed up because > > of caching by the OS. > > > As i mentioned in my previous mail that the companyId is a multivalued > field, so caching it will consume a lot of memory. And this way we'll have > to keep the document vs field mapping also in the memory. > > > > > If you've got plenty of memory vs index size you could look at > > RAMDirectory or MMapDirectory. Or how about some solid state disks? > > Someone recently posted some very impressive performance stats. > > > The index size is around 20G and the available Memory is 4G so, keeping the > entire index into the memory is not possible. But as i mentioned earlier > that it is using only 1 G out of 4 G, so is their a way to specify the > lucene to cache more documents , say use 2G for caching the index ?? > > I'll appreciate more suggestions on the same problem. > > Regards, > Vipin > --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
