On 09/02/2011 07:32 PM, Filip Navara wrote:
On Fri, Sep 2, 2011 at 11:04 AM, Filip Navara<filip.nav...@gmail.com> wrote:
*snip*
The time to create an index on my 266 Mb experimental database is more
than 9 minutes.
*snip*
I erroneously measured the time with DEBUG build, so I've rerun the
experiment with several SQLite versions:
[2869ed2829] Leaf: Avoid using uninitialized variables after failures
in the merge sort code. (user: drh, tags: trunk)
CPU Time: user 107.359888 sys 135.050066
[7769fb988d] Instead of a temporary b-tree, use a linked-list and
merge-sort to sort records in main memory in vdbesort.c. (user: dan,
tags: merge-sort)
CPU Time: user 118.451559 sys 132.117247
[71075673c6] Leaf: If all data being sorted fits in memory, avoid
writing any data out to temporary files in vdbesort.c. (user: dan,
tags: merge-sort)
CPU Time: user 116.813549 sys 132.710051
Thanks for doing this. There is (hopefully) a fix for the performance
regression up now.
Dan.
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