An interesting thing

[Flik Shen]

Hi,   I am freshman to Lucene and I am reading the book “Lucene In Action”. Just as that we know, there are two kinds of directory to hold index, one is File System and the other is RAM. There is a sample to compare performances of these two kind directories and there is also a piece of code about “Batch indexing by using RAMDirectory as a buffer”. When I follow some samples, I found an interesting thing about indexing performance.   I combine these two pieces of codes and time each kind directory indexing. (Please refer the attachment for details processes) I load 3000 docs and 5 words per doc. I use File System Directory and RAM Directory to indexing these docs directly. The time of these two are 10737ms and 1575ms. Then I use a RAM directory as a buffer for indexing and use method “addIndexes” of a new Index writer which finally holds index in a File System directory. The time it consumed is 1348ms. How could this be? I think the time that buffered indexing consumes should base on the time of RAM indexing. I wonder why a buffered indexing even has a good performance than a ram indexing. So interesting!   Best regards, Flik Shen **************** CAUTION - Disclaimer ***************** This e-mail contains PRIVILEGED AND CONFIDENTIAL INFORMATION intended solely for the use of the addressee(s). If you are not the intended recipient, please notify the sender by e-mail and delete the original message. Further, you are not to copy, disclose, or distribute this e-mail or its contents to any other person and any such actions are unlawful. This e-mail may contain viruses. Infosys has taken every reasonable precaution to minimize this risk, but is not liable for any damage you may sustain as a result of any virus in this e-mail. You should carry out your own virus checks before opening the e-mail or attachment. Infosys reserves the right to monitor and review the content of all messages sent to or from this e-mail address. Messages sent to or from this e-mail address may be stored on the Infosys e-mail system. ***INFOSYS******** End of Disclaimer ********INFOSYS***

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