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[Mahara Bot <1353802@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://reviews.mahara.org/3610
Committed: http://gitorious.org/mahara/mahara/commit/4bd9d4930153eef45cbebcc84ea07deee62a7345
Submitter: Robert Lyon (robertl@xxxxxxxxxxxxxxx)
Branch:    master

commit 4bd9d4930153eef45cbebcc84ea07deee62a7345
Author: Nigel Cunningham <nigelc@xxxxxxxxxxxxxxx>
Date:   Tue Jul 29 14:04:56 2014 +1000

(Bug1353802) Remember and reuse last db_format_timestamp output if poss.

This patch adds support for remembering the last parameter used
by ArtefactType::commit to db_format_timestamp and the output of
the function, and reusing the output if the input is the same on
the next call.

In a test import of 2000 users, this patch reduced the number of
invocations of db_format_timestamp from 80,000 (3.6s) to 14,800
(.3s).

Change-Id: I6f5575f9d3649ff53514f9927744a01966d103dd
Signed-off-by: Nigel Cunningham <nigelc@xxxxxxxxxxxxxxx>

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https://bugs.launchpad.net/bugs/1353802

Title:
  Upload users from CSV performance improvements.

Status in Mahara ePortfolio:
  New

Bug description:
  In doing the memory limit work, I've prepared a number of patches to
  improve the performance of the various import and export functions.
  This bug is for submitting those patches against master.

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