The IBM Large System Performance Reference (LSPR) ratios represent IBM's assessment of relative processor capacity in an unconstrained environment for the specific benchmark workloads and system control programs specified in the tables. Ratios are based on measurements and analysis. The amount of analysis as compared to measurement varies with each processor. The data that follows is based solely on IBM's measurements and analysis of the processors in the tables. For machines not listed in the tables, contact the corresponding vendor for performance information.

Many factors, including but not limited to the following, may result in the variances between the ratios provided herein and actual operating environments:

IBM does not guarantee that your results will correspond to the ratios provided herein. This information is provided "as is", without warranty, express or implied.

For some details on how LSPR data is obtained see measurements.


LSPR data


LSPR workloads including the latest changes/updates


z/OS V2 R1 LSPR ITR ratios


z/OS V1 R13 LSPR ITR ratios


z/OS V1 R11 LSPR ITR ratios


Linux on z Systems SLES11 SP3 LSPR ITR ratios


Linux on z Systems SLES11 LSPR ITR ratios


KVM on z Systems V1.1.0 LSPR ITR ratios


z/VM V6 R3 ITR ratios


z/VM V6 R1 ITR ratios


System Resources Manager (SRM) constants


Download LSPR

Optionally, download the full LSPR document (SC28-1187-19) in PDF format:


Additional information

The following links provide additional sources for performance information for z/VM and z/VSE.