Configuration of primary and secondary resource control parameters is important for security and stability of the whole system. Auxiliary parameters differ much from the primary and secondary parameters in this respect.
The main functions of auxiliary parameters are the following:
Without these auxiliary parameters, possible bugs in applications (such as forgetting to unlock locked files or forgetting to collect signals) will cause slowdown and, after some time, termination of the applications because of memory exhaustion. In presence of these parameters, applications will notice the problem (because, for example, attempts to create new file locks start to fail), show an appropriate message helping to understand the problem and either continue operations or exit gracefully.
shmpagesparameter, or limiting the number of simultaneous shell sessions through the
So, auxiliary parameters play a role similar to the limitations configurable through the
setrlimit(2) interface and
sysctl(8) in standard Linux installations (please see the Other Existing Resource Control Mechanisms subsection).
Because of this helper role in resource control, system management software may show auxiliary parameters in advanced mode for experienced administrators only and hide them in "basic" management modes.
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