13-15 November 2018
America/Vancouver timezone

libresource - Getting system resource information with standard APIs

13 Nov 2018, 14:55
15m
Junior-Ballroom-AB (Sheraton Vancouver Wall Center)

Junior-Ballroom-AB

Sheraton Vancouver Wall Center

100

Speaker

Rahul Yadav (Oracle)

Description

System resource information, like memory, network and device statistics, are crucial for system administrators to understand the inner workings of their systems, and are increasingly being used by applications to fine tune performance in different environments.

Getting system resource information on Linux is not a straightforward affair. The best way is to collect the information from procfs or sysfs, but getting such information from procfs or sysfs presents many challenges. Each time an application wants to get a system resource information, it has to open a file, read the content and then parse the content to get actual information. If application is running in a container then even reading from procfs directly may give information about resources on whole system instead of just the container. Libresource tries to fix few of these problems by providing a standard library with set of APIs through which we can get system resource information e.g. memory, CPU, stat, networking, security related information.

Libresource provides/may provide following benefits:

  • Virtualization: In cases where application is running in a virtualized environment using cgroup or namespaces, reading from /proc and /sys file-systems might not give correct information as these are not cgroup aware. Library API will take care of this e.g. if a process is running in a cgroup then library should provide information which is local to that cgroup.
  • Ease of use: Currently applications needs to read this info mostly from /proc and /sys file-systems. In most of the cases complex string parsing is involved which is needed to be done in application code. With the library APIs application can get the information directly and all the string parsing, if any, will be done by library.
  • Stability: If the format in which the information is provided in /proc or /sys file-system is changed then the application code is changed to align with those changes. Also if a better way to get information comes in future, like through a syscall or a sysconf then again application code needs to be changed to get the benefit of it. Library will take care of such changes and the application will never have to change the code.

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