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Introduction

Enables legacy applications to leverage Linux's memory deduplication. Only works on Linux ≥ 2.6.32.

If you have multiple processes generating similar data (like multiple applications serving different vhosts), this easy to use tool may allow you to spare memory by deduplicating it. If two pages (typically consecutive blocks of 4k) are identical, they will be merged to reduce memory usage.

Building and installing

First, please make sure you have installed the requirements:

  • Kernel headers (linux-headers under Ubuntu)
  • a build toolchain (build-essentials under Ubuntu)
  • cmake > 2.8 (earlier version may work, please tell me if so)

The quick and dirty way:

cmake .
make
sudo make install

More

More information, howto, on vleu.net/ksm_preload.