Query Capacity library (qclib)
This page is the 'homepage' of the Linux on z Systems qclib package ('qclib' for 'Query Capacity library').
qclib provides a C API for extraction of system information for Linux on
For instance, it will provide the number of CPUs
- on the machine (CEC, Central Electronic Complex) layer
- on the PR/SM (Processor Resource/Systems Manager) layer, i.e. visible to LPARs, including LPAR groups
- in z/VM hosts, guests and CPU pools
- in KVM hosts and guests
This allows calculating the upper limit of CPU resources a highest level
guest can use.
For example: If an LPAR on a z13 provides 4 CPUs to a z/VM hypervisor, and the hypervisor provides 8 virtual CPUs to a guest, qclib can be used to retrieve all of these numbers, and it can be concluded that not more capacity than 4 CPUs can be used by the software running in the guest.
Refer to the README delivered with qclib in the downloadable package for installation instructions, documentation, and more.
Download area - current: Query Capacity library package
|2018-04-10||qclib-1.4.0.tgz / MD5||Add SMT support.|
Previous qclib releases
|2018-01-18||qclib-1.3.1.tgz / MD5||Bugfix release.|
|2017-10-27||qclib-1.3.0.tgz / MD5||Support STHYI instruction in LPAR environments.|
|2016-06-10||qclib-1.2.0.tgz / MD5||Add support for LPAR group capping. Expand hypfs usage. Provide detailed CPU counts for KVM hosts and guests.|
|2016-02-15||qclib-1.1.0.tgz / MD5||Second release: minor enhancements and bug fixes.|
|2015-08-28||qclib-1.0.0.tgz / MD5||Initial release.|