SYSTEM FOR MODELING LPAR BEHAVIORS IN A SIMULATION TOOL

• US 20090192779A1
• Filed: 04/08/2009
• Published: 07/30/2009
• Est. Priority Date: 02/27/2004
• Status: Active Grant

• Current Assignee: Martin Deitch
• Original Assignee: Martin Deitch
• Inventors: Deitch, Martin
• Granted Patent: US 7,827,021 B2
• Time in Patent Office: Days
• US Class Current: 703/21
• CPC Class Codes: G06F 11/3442 for planning or managing the needed capacity
• CPC Class Codes: G06F 11/3447 Performance evaluation by modeling
• CPC Class Codes: G06F 11/3457 Performance evaluation by simulation
• CPC Class Codes: G06F 2201/86 Event-based monitoring

Abstract

A simulation tool for modeling LPAR behavior in a mainframe computer. The simulation tool comprises: a system for calculating a resource percentage, wherein the resource percentage represents a percentage of total resources allocated to the LPAR, wherein the resource percentage is equal to: 100%—a percentage of resources allocated to all other LPARs running in the simulated computer; a system for calculating a time slice percentage for the LPAR based on the resource percentage and CP (central processor) data, wherein: time slice percentage=((resource percentage)×(# of physical CPs))/(# of logical CPs); a system for determining a CP (central processor) percentage, wherein the CP percentage represents a percentage of time that all physical CPs in the computer being modeled have been allocated to the LPAR; a system for determining causing the computer simulation not to dispatch CPs to the LPAR for a current modeling interval if the CP percentage is greater than the time slice percentage; and a system for outputting and displaying the behavior of the modeling.

Claims

1. A tool for simulating operation of a computer having a system for modeling a behavior of an LPAR operating in a time slice dispatch mode, the modeling system comprising:

a system for calculating a resource percentage, wherein the resource percentage represents a percentage of total resources allocated to the LPAR, wherein the resource percentage is equal to;

100%—

a percentage of resources allocated to all other LPARs running in the simulated computer;

a system for calculating a time slice percentage for the LPAR based on the resource percentage and CP (central processor) data, wherein;

$\mathrm{time}<br><br><br><br>\mathrm{slice}<br><br><br><br>\mathrm{percentage}=\frac{\begin{array}{c}\left(\mathrm{resource}<br><br><br><br>\mathrm{percentage}\right)\times <br><br>\\ \left(\#<br><br><br><br>\mathrm{of}<br><br><br><br>\mathrm{physical}<br><br><br><br>\mathrm{CPs}\right)\end{array}}{\left(\#<br><br><br><br>\mathrm{of}<br><br><br><br>\mathrm{logical}<br><br><br><br>\mathrm{CPs}\right);<br><br>}$

a system for determining a CP (central processor) percentage, wherein the CP percentage represents a percentage of time that all physical CPs in the computer being modeled have been allocated to the LPAR;

a system for determining causing the computer simulation not to dispatch CPs to the LPAR for a current modeling interval if the CP percentage is greater than the time slice percentage; and

a system for outputting and displaying the behavior of the modeling.

2. The tool of claim 1, wherein the percentage of resources allocated to all other LPARs is based on a weighting factor specified for each LPAR, a number of logical CPs allocated to each LPAR, and a MIPs (million instructions per second) value for each LPAR.

3. The tool of claim 2, wherein the MIPs value represents a maximum consumption that each LPAR could consume in an unrestrained processor.

4. A program product stored on a computer readable medium for modeling a behavior of an LPAR (logical partition) in a simulated computer operating in a time slice dispatch mode, comprising:

means for calculating a resource percentage, wherein the resource percentage represents a percentage of total resources allocated to the LPAR, wherein the resource percentage is equal to;

100%—

a percentage of resources allocated to all other LPARs;

means for calculating a time slice percentage for the LPAR based on the resource percentage and CP (central processor) data, wherein;

$\mathrm{time}<br><br><br><br>\mathrm{slice}<br><br><br><br>\mathrm{percentage}=\frac{\begin{array}{c}\left(\mathrm{resource}<br><br><br><br>\mathrm{percentage}\right)\times <br><br>\\ \left(\#<br><br><br><br>\mathrm{of}<br><br><br><br>\mathrm{physical}<br><br><br><br>\mathrm{CPs}\right)\end{array}}{\left(\#<br><br><br><br>\mathrm{of}<br><br><br><br>\mathrm{logical}<br><br><br><br>\mathrm{CPs}\right);<br><br>}$

means for determining a CP (central processor) percentage, wherein the CP percentage represents a percentage of time that all physical CPs in the computer being modeled have been allocated to the LPAR;

means for determining causing the computer simulation not to dispatch CPs to the LPAR for a current modeling interval if the CP percentage is greater than the time slice percentage; and

means for outputting and displaying the behavior of the modeling.

5. The program product of claim 4, wherein the percentage of resources allocated to all other LPARs is based on a weighting factor specified for each LPAR, a number of logical CPs allocated to each LPAR, and a MIPs (million instructions per second) value for each LPAR.

6. The program product of claim 5, wherein the MIPs value represents a maximum consumption that each LPAR could consume in an unrestrained processor.