# US 9,519,572 B2 · Creating a software performance testing environment on a virtual machine system

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- Number: US 9,519,572 B2
- Document ID: US9519572B2
- Status: Granted
- Kind: B2
- Application number: 14/674,619
- Filed: 2015-03-31
- Published: 2015-10-01
- Granted: 2016-12-13
- Earliest claimed: 2014-03-31
- Assignees: International Business Machines Corporation
- Applicants: International Business Machines Corporation
- Inventors: Xin Hao Cheng; Guo Qiang Hu; Jun Chi Yan; Jun Zhu
- Web page: https://patentgrep.com/patent/US9519572B2

## CPC

- G06F 11/3466: {Performance evaluation by tracing or monitoring}
- G06F 3/0601: {Interfaces specially adapted for storage systems}
- G06F 3/0611: {in relation to response time}
- G06F 3/0659: {Command handling arrangements, e.g. command buffers, queues, command scheduling}
- G06F 3/0689: {Disk arrays, e.g. RAID, JBOD}
- G06F 9/45533: {Hypervisors; Virtual machine monitors}
- G06F 9/45558: {Hypervisor-specific management and integration aspects}
- G06F 9/4881: {Scheduling strategies for dispatcher, e.g. round robin, multi-level priority queues}
- G06F 9/4887: {involving deadlines, e.g. rate based, periodic}
- G06F 11/073: {in a memory management context, e.g. virtual memory or cache management (memory management G06F12/00; testing of static memory units G11C29/00)}
- G06F 11/301: {where the computing system is a virtual computing platform, e.g. logically partitioned systems (virtual machines G06F9/45533; logical partitioning of resources G06F9/5077)}
- G06F 11/302: {where the computing system component is a software system}
- G06F 11/3024: {where the computing system component is a central processing unit [CPU]}
- G06F 11/3037: {where the computing system component is a memory, e.g. virtual memory, cache (accessing, addressing or allocating within memory systems or architectures G06F12/00; checking stores for correct operation G11C29/00)}
- G06F 11/3051: {Monitoring arrangements for monitoring the configuration of the computing system or of the computing system component, e.g. monitoring the presence of processing resources, peripherals, I/O links, software programs (verification or detection of system hardware configuration G06F11/2247)}
- G06F 11/3419: {by assessing time}
- G06F 11/3485: {for I/O devices}
- G06F 11/3688: {for test execution, e.g. scheduling of test suites}
- G06F 11/3698: Environments for analysis, debugging or testing of software
- G06F 2009/45591: {Monitoring or debugging support}
- G06F 2201/815: Virtual
- G06F 2201/865: Monitoring of software
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)

## Abstract

The present invention relates to a virtual machine, and specifically discloses a method and apparatus for creating a software performance testing environment based on a virtual machine, wherein the method comprises: in response to obtaining a hard disk read/write request triggered by a virtual CPU of the virtual machine, notifying a virtual CPU scheduler to record a CPU time quota t1 already consumed by the virtual CPU in a current CPU schedule period; in response to detecting completion of hard disk read/write processing corresponding to the hard disk read/write request, predicting a hard disk read/write latency t corresponding to the hard disk read/write request in a target environment; notifying the virtual CPU scheduler to determine a CPU time quota already consumed by the virtual CPU in the current CPU schedule period based on the recorded CPU time quota t1 and the hard disk read/write latency t; and adjusting a system clock of the virtual machine based on the determined CPU time quota already consumed by the virtual CPU in the current CPU schedule period. The method according to the embodiments of the present invention may obtain, in the created software performance testing environment, a software performance testing result consistent with the result obtained under a highly configured server in the target environment.

## Claims

### Claim 1

An apparatus for creating a software performance testing environment on a virtual machine system, the virtual machine system running at least one virtual machine (VM) on a single hardware platform, the single hardware platform configured to simulate a target environment on which software is to be run, said apparatus comprising at least one central processor unit (CPU) and a memory coupled with the CPU, the CPU configured to:
obtain a hard disk read/write request triggered by a virtual CPU of the virtual machine, and in response to obtaining said triggered request, notify a virtual CPU scheduler to record a CPU time duration t1 already consumed by the virtual CPU in a current CPU schedule period, said time duration t1 having a corresponding physical CPU processing time consumed by the VM;
in response to detecting completion of hard disk read/write processing corresponding to the hard disk read/write request, predict a hard disk read/write latency t corresponding to the hard disk read/write request in a target environment, said latency t based a time when the hard disk read/write processing is completed;
notify the virtual CPU scheduler to determine a CPU processing time already consumed by the virtual CPU in the current CPU schedule period based on the recorded CPU time duration t1 and the predicted hard disk read/write latency t; and
adjust a system clock of the virtual machine forward based on the determined CPU processing time already consumed by the virtual CPU in the current CPU schedule period, wherein the CPU is further configured to:
determine that the hard disk read/write request belongs to a hard disk read/write request that would not occur in the target environment, and predict that, in the target environment, the hard disk read/write latency t corresponding to the hard disk read/write request is equal to 0, wherein to determine that the hard disk read/write request belongs to a hard disk read/write request that would not occur in the target environment, said CPU is further configured to:
determine from the memory access request a virtual memory address of the content to be accessed,
query a virtual memory address mapping table maintained by a memory manager to determine, whether the virtual memory address is mapped to the physical memory address of the virtual machine system; and
if determined that the virtual memory address is not mapped to the physical memory address of the virtual machine system, it is determined that the memory access request needs the physical machine for the virtual machine to perform the hard disk read/write operation; and
wherein the CPU is further configured to:
notify the virtual CPU scheduler to cause the virtual CPU to suspend its work;
notify the virtual CPU scheduler to cause the suspended virtual CPU to resume its work; and
notify the virtual CPU scheduler to set the CPU time duration already consumed by the virtual CPU in the current CPU schedule period to t1.

### Claim 2 (depends on 1)

The apparatus according to claim 1, wherein the CPU is further configured to: determine that the hard disk read/write request belongs to a hard disk read/write request that would occur in the target environment, and predict the hard disk read/write latency t corresponding to the hard disk read/write request in the target environment based on a time when the hard disk read/write processing is completed, wherein to determine that the hard disk read/write request belongs to a hard disk read/write request that would occur in the target environment, said CPU is further configured to:
determine from the memory access request a virtual memory address of the content to be accessed,
query a virtual memory address mapping table of the target environment maintained in a virtual machine manager to determine whether the virtual memory address is mapped to the physical memory address of the target environment; and
if the virtual memory address is mapped to the physical memory address of the target environment, it is determined that the memory access request does need the hard disk read/write operation to be performed in the target environment.

### Claim 3 (depends on 1)

The apparatus according to claim 1, wherein the CPU is further configured to notify the hard disk read/write latency t to the virtual CPU scheduler and notify the virtual CPU scheduler to cause the suspended virtual CPU to resume its work;
set the CPU time duration already consumed by the virtual CPU in the current CPU schedule period to t+t1.

### Claim 4 (depends on 1)

The apparatus according to claim 1, wherein the CPU is further configured to record a CPU time quota t2 already consumed by the virtual CPU in the current CPU schedule period; to determine that the hard disk read/write request belongs to a hard disk read/write request that would not occur in the target environment, and to predict that, in the target environment, the hard disk read/write latency t corresponding to the hard disk read/write request is equal to 0; and
notify the virtual CPU scheduler to determine a CPU time quota already consumed by the virtual CPU in the current CPU schedule period based on the recorded CPU time quotas t1, t2 already consumed by the virtual CPU in the CPU schedule period and the hard disk read/write latency t equal to 0.

### Claim 5 (depends on 4)

The apparatus according to claim 4, wherein the CPU is further configured to notify the virtual CPU scheduler to set the CPU time quota already consumed by the virtual CPU in the current CPU schedule period to t2.

### Claim 6 (depends on 2)

The apparatus according to claim 2, wherein the CPU is further configured to record a CPU time quota t2 already consumed by the virtual CPU in the current CPU schedule period; to determine that the hard disk read/write request belongs to a hard disk read/write request that would occur in the target environment, and to predict the hard disk read/write latency t corresponding to the hard disk read/write request in the target environment based on a time when the hard disk read/write processing is completed; and
notify the virtual CPU scheduler to determine a CPU time quota already consumed by the virtual CPU in the current CPU schedule period based on the recorded CPU time quotas t1, t2 already consumed by the virtual CPU and the hard disk read/write latency t.

### Claim 7 (depends on 6)

The apparatus according to claim 6, wherein the CPU is further configured to:
in response to t being less than or equal to (t2−t1), set the CPU time quota already consumed by the virtual CPU in the current CPU schedule period; and
in response to t being greater than (t2−t1), set the CPU time quota already consumed by the virtual CPU in the current CPU schedule period to t1+t.

### Claim 8 (depends on 1)

The apparatus according to claim 1, wherein to determine that the hard disk read/write request belongs to a hard disk read/write request that would not occur in the target environment said CPU is further configured to: obtain a memory access request of the virtual machine; determine that the memory access request needs a physical machine of the virtual machine to perform a hard disk read/write operation; in response to determining that the memory access request needs the hard disk read/write operation to be performed in the target environment, marking the hard disk read/write request triggered by the memory access request in the physical machine of the virtual machine.