(edited previous response)
Thanks, but each different query at the first run i see some slowdown
(not much though) with MMapDirectory and FSDirectory wrt second, third
runs (due to cold start), though.
Cold start slowdown is a little bit more with FSdirectory. So,
MMapDirectory is slightly better in that, too: ie, cold start.
What i want to achieve: Problem statement:
base case is disk based Lucene index with FSDirectory
speedup case was supposed to be in memory Lucene index with MMapDirectory
Uwe mentioned tmpfs will help. i will try that next.
I thought preload was not helping much as we discussed here.
Thanks
On 2/23/21 3:54 PM, Robert Muir wrote:
speedup over what? You are probably already using MMapDirectory (it is
the default). So I don't know what you are trying to achieve, but
giving lots of memory to your java process is not going to help.
If you just want to prevent the first few queries to a fresh cold
machine instance from being slow, you can use the preload for that
before you make it available. You could also use 'cat' or 'dd'.
On Tue, Feb 23, 2021 at 3:45 PM <baris.ka...@oracle.com
<mailto:baris.ka...@oracle.com>> wrote:
Thanks but then how will MMapDirectory help gain speedup?
i will try tmpfs and see what happens. i was expecting to get on
order of magnitude of speedup from already very fast on disk
Lucene indexes.
So i was expecting really really really fast response with
MMapDirectory.
Thanks
On 2/23/21 3:40 PM, Robert Muir wrote:
Don't give gobs of memory to your java process, you will just
make things slower. The kernel will cache your index files.
On Tue, Feb 23, 2021 at 1:45 PM <baris.ka...@oracle.com
<mailto:baris.ka...@oracle.com>> wrote:
Ok, but how is this MMapDirectory used then?
Best regards
On 2/23/21 7:03 AM, Robert Muir wrote:
>
>
> On Tue, Feb 23, 2021 at 2:30 AM <baris.ka...@oracle.com
<mailto:baris.ka...@oracle.com>
> <mailto:baris.ka...@oracle.com
<mailto:baris.ka...@oracle.com>>> wrote:
>
> Hi,-
>
> I tried MMapDirectory and i allocated as big as index
size on my
> J2EE
> Container but
>
>
> Don't allocate java heap memory for the index,
MMapDirectory does not
> use java heap memory!
