System Config Wrapper

A small utility to override values returned by the sysconf system call. Expects environment variables to describe what value to override.

SCW<number>=<value> LD_PRELOAD=system-config-wrapper.so <command>

Configuration numbers are defined as enum values in /usr/include/bits/confname.h. These are likely pretty stable because change would break existing binaries.

Example: Override Processor Count

To make the sysconf call report 256 processors:

SCW84=256 LD_PRELOAD=system-config-wrapper.so <application>

Example: Override Page Size

To make the sysconf call report 512 byte pages:

SCW30=512 LD_PRELOAD=system-config-wrapper.so <application>