Thanks for replying.
   My document has many different fields(about 30 fields, 10 different type of 
documents but these are not the point ) and I have to search over several 
   I was putting all 76M documents into several lucene indexes and use the 
default lucene.net ParaSearch to search over these indexes. That was slow, more 
than 20s.
   Then someone suggested I need to merge all our indexes into a huge one, he 
thought lucene can handle 76M documents in one index easily. Then I merged all 
the documents into a single huge one(which took me 3 days) . That time, the 
index folder is about 15G(I don't store info into index, just index them). 
Actually the search is still very slow, more than 20s too, and looks slower 
than use several indexes. 
   Then I come to solr. Why I put 1M into each core is I found when a core has 
1M document, the search speed is fast, range from 0-500ms, which is acceptable. 
I don't know how many documents to saved in one core is proper. 
   The problem is even if I put 2M documents into each core. Then I have only 
36 cores at the moment. But when our documents doubles in the future, same 
issue will rise again. So I don't think save 1M in each core is the issue. 
   The issue is I put too many cores into one server. I don't have extra server 
to spread solr cores. So we have to improve solr search speed from some other 
   Any suggestion?


在2010-07-15 15:24:08,"Fornoville, Tom" <tom.fornovi...@truvo.com> 写道:
>Is there any reason why you have to limit each instance to only 1M
>If you could put more documents in the same core I think it would
>dramatically improve your response times.
>-----Original Message-----
>From: marship [mailto:mars...@126.com] 
>Sent: donderdag 15 juli 2010 6:23
>To: solr-user
>Subject: How to speed up solr search speed
>Hi. All.
>    I got a problem with distributed solr search. The issue is 
>    I have 76M documents spread over 76 solr instances, each instance
>handles 1M documents. 
>   Previously I put all 76 instances on single server and when I tested
>I found each time it runs, it will take several times, mostly 10-20s to
>finish a search. 
>   Now, I split these instances into 2 servers. each one with 38
>instances. the search speed is about 5-10s each time. 
>10s is a bit unacceptable for me. And based on my observation, the slow
>is caused by disk operation as all theses instances are on same server.
>Because when I test each single instance, it is purely fast, always
>~400ms. When I use distributed search, I found some instance say it need
>   Our server has plenty of memory free of use. I am thinking is there a
>way we can make solr use more memory instead of harddisk index, like,
>load all indexes into memory so it can speed up?
>welcome any help.

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