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Top Forums UNIX for Advanced & Expert Users Memory Usage(Physical) in one Word? Suse Linux. Post 302837659 by MadeInGermany on Friday 26th of July 2013 11:02:11 AM
Old 07-26-2013
IMHO the Linux memory strategy is overdone.
A Linux box that does continuous I/O will fill all memory with cache data, and indeed becomes unresponsive (i.e. starting a new process is slow).
Other OS like HP-UX have a tunable percentage of memory that is used for caching.
 

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audit_memory_usage(5)						File Formats Manual					     audit_memory_usage(5)

NAME
audit_memory_usage - percentage of physical memory that can be used by audit subsystem VALUES
Failsafe Default Allowed values Recommended values DESCRIPTION
The tunable defines the percentage of physical memory that can be used by audit records. If the audit record memory usage exceeds the limit, the audit subsystem blocks the system call until memory usage comes down inside the limit. Who Is Expected to Change This Tunable? Administrator with proper privileges can change the value of Restrictions on Changing This tunable value can be changed any time, as this is a dynamic tunable; but its value can not be lowered below the memory currently used by the audit subsystem for records. When Should the Value of This Tunable Be Raised? When the system to be audited is critical and generates many records. What are the Side Effects of Raising the Value? If the system is generating great number of records, and the value is raised, then it can create a lot of unflushed memory and might slow down the system. When Should the Value of This Tunable Be Lowered? When the audit subsystem is not generating many records. What are the Side Effects of Lowering the Value? If many audit records are generated, then the auditing subsystem might block the system call. What Other Tunable Values Should Be Changed at the Same Time? None. WARNINGS
All HP-UX kernel tunable parameters are release specific. This parameter may be removed or have its meaning changed in future releases of HP-UX. Installation of optional kernel software, from HP or other vendors, may cause changes to tunable parameter values. After installation, some tunable parameters may no longer be at the default or recommended values. For information about the effects of installation on tun- able values, consult the documentation for the kernel software being installed. For information about optional kernel software that was factory installed on your system, see at AUTHOR
was developed by HP. SEE ALSO
audit(5). Tunable Kernel Parameters audit_memory_usage(5)
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