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Why do I get MemoryError under FreeBSD when my server has tons of free physical memory?

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Warning: This item is marked as outdated.

This FAQ applies to: Plone 2.1.x, Plone 2.0.x

When running FreeBSD with more than 512MB of RAM, why do I get MemoryErrors when my server has tons of free physical memory?

By default in FreeBSD 5.X or 4.X the kernel will limit the amount of RAM any one process can use to 512MB (older versions of FreeBSD this was lower).

You can tweak this in /boot/loader.conf by setting these values: 

  kern.maxdsiz="1610612736"
  kern.dfldsiz="1610612736"
  kern.maxssiz="1610612736"

Reboot for the new values to take effect.

This will allow the process to use more physical RAM, but be careful because putting this number too close to the actual amount of physical RAM might cause the box to not boot.

by Calvin Hendryx-Parker — last modified October 7, 2005 - 14:23
Contributors: Calvin Hendryx-Parker, George Donnelly
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