mahara-contributors team mailing list archive

[Aaron Wells <1132370@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

While trying to optimize memory usage in the mahara.org cron jobs (which
keep crashing due to running out of memory), I noticed from the error
stacks that it kept crashing on the call to create_function() in
db_quote_table_placeholders() in dml.php

The reason for this, is because functions created by create_function()
are never garbage collected. They persist for the lifetime of the
script's execution. Which means that if you put it inside a loop that
gets called thousands of times, it keeps using up more and more memory
with new copies of the function, until the script crashes from running
out of RAM.

There are about a dozen other usages of create_function() in Mahara's
codebase, but this is the only one that's likely to be used in a large
loop.

** Affects: mahara
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1132370

Title:
  Remove create_function() from dml.php to save memory

Status in Mahara ePortfolio:
  New

Bug description:
  While trying to optimize memory usage in the mahara.org cron jobs
  (which keep crashing due to running out of memory), I noticed from the
  error stacks that it kept crashing on the call to create_function() in
  db_quote_table_placeholders() in dml.php

  The reason for this, is because functions created by create_function()
  are never garbage collected. They persist for the lifetime of the
  script's execution. Which means that if you put it inside a loop that
  gets called thousands of times, it keeps using up more and more memory
  with new copies of the function, until the script crashes from running
  out of RAM.

  There are about a dozen other usages of create_function() in Mahara's
  codebase, but this is the only one that's likely to be used in a large
  loop.

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