Is indexing slower?


#1

Hi - I upgraded to Ferret 0.11.3 from 0.10.13.

I used to index 10,000 records in 10 secs. Now it takes 13 minutes.
(That’s a factor of ~75x)

Did something change in the flush semantics, or something?

Thanks!

Schnitz


#2

On 3/5/07, Matt S. removed_email_address@domain.invalid wrote:

Hi - I upgraded to Ferret 0.11.3 from 0.10.13.

I used to index 10,000 records in 10 secs. Now it takes 13 minutes.
(That’s a factor of ~75x)

Did something change in the flush semantics, or something?

Hi Matt,

The opening of an index takes a little longer now. I guess if you have
the index set to :auto_flush then it could take a fair bit longer but
I didn’t expect it to take that much longer. Unfortunately this
slowdown was a price I had to pay to prevent the segfault and
FileNotFound errors that people where getting. Having said that, you
shouldn’t have :auto_flush set when you are batch indexing anyway.

If you send me a benchmark which approximates what you are doing, I’d
be happy to take a look at it for you and tell you how to make it
faster or add a fix to Ferret if the problem does happen to be at this
end.

Cheers,
Dave


#3

Figured it out. It’s interesting, academically.

I was flushing every time I added something to the index. I forget
exactly
why I thought that was a good idea, but that’s what I was doing.

Apparently, that’s a bad idea under 0.11. Worked fine under 0.10, not
so
fine under 0.11. Like, 75x less fine.

Now I’m just flushing after every batch. It’s back to reasonable,
5-seconds-for-10,000-small-records performance.

Thanks for all your help, Dave.

Schnitz