JPH02121039A - Load prediction simulation system for computer system - Google Patents

Abstract

PURPOSE:To raise the precision of load prediction in various kinds of supposed systems by operating a load predicted object CPU under operating surroundings simulated by a simulating CPU, and measuring load in this operating state by the load predicted object CPU itself. CONSTITUTION:The load predicted object CPU 11 operates under the operating surroundings of the supposed system simulated by channel alternation interfaces 4, 15 to alternate a channel in response to a request from the simulating CPU 21. The load predicted object CPU 11 predicts the load in the supposed system of various scales simulated by the simulating CPU 21 by measuring the load in the operating state of itself by a load measuring tool 11a built in the CPU 11. Thus, simulation for the load prediction of large-scale computer system can be executed at high precision without constructing actual operating system.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a load prediction simulation method suitable for predicting the load of a computer system.

(Prior Art) External events input to a CPU (Central Processing Unit) of a computer system are generally represented by inputs from channels connected to an input/output bus or a DMA bus. The number of channels varies from system to system, and therefore the (CPU) load of the system also differs. A simple method to verify system operation against this load is to construct a system with the same configuration as in actual operation, but this method is difficult to apply to large-scale systems. Therefore, particularly in large-scale systems, CPU load prediction is performed by simulation.

Conventionally, for load prediction of a large-scale computer system (CPU thereof), it has been common to apply a simulation method using software possessed by the CPU to be subjected to load prediction. However, although software simulations are effective for rough simulations, they have various problems, such as difficulty in modeling to improve the accuracy of simulations and the enormous amount of time it takes to model. Ta. Also, large-scale computer system (CPU)
In order to increase the accuracy of load prediction, it is also known to prepare all the peripheral devices that make up the system and actually use these devices to perform load prediction (measurement). However, with this method, for example, the login of the terminal
For testing, etc., the required number of “terminals” and “
It was difficult to apply, as it required gathering human resources, which was almost equivalent to building an actual operational system.

(Problems to be Solved by the Invention) As mentioned above, in the conventional method of performing simulations for predicting the load of a computer system using the software of the CPU targeted for load prediction, the simulation is performed with high accuracy without constructing an actual operational system. The problem was that it was difficult to do so.

Therefore, the problem to be solved by this invention is that the simulation for predicting the load of a large-scale computer system is
The goal is to be able to perform this with high accuracy without building an actual operational system.

[Structure of the Invention] (Means for Solving the Problem) The present invention connects interface means for substituting various channels to several buses of a CPU subject to load prediction, and executes a simulation program. , generate various conditions simulating the operation of various channels necessary for simulation for load prediction according to the assumed system, and send a series of requests to access the target CPU for load prediction to the target bus connected to the target bus. A simulation CPU is provided to sequentially notify the interface means, and the interface means creates a protocol on the bus that corresponds to the request from the simulation CPU in a simulated manner, and performs alternative access to the load prediction target CPU in place of the assumed channel. Accordingly, the present invention is characterized in that the load corresponding to the operating state of the CPU to be subjected to load prediction is measured and the load is predicted.

(Operation) According to the above configuration, when the simulation CPU executes the simulation program and generates various conditions for load prediction simulating the assumed system,
The interface means sequentially creates a simulated protocol on the bus that meets the conditions and accesses the CPU subject to load prediction.

As a result, the load prediction target CPU operates in an operating environment simulated by the simulation CPU, so by measuring the load in this operating state by the load prediction target CPU itself, load prediction in various assumed systems can be performed with high accuracy. You can do it with

(Embodiment) FIG. 1 is a block configuration diagram showing an embodiment of the present invention, and 11 is a CPU to be subjected to load prediction (constituting the center of the actual operation system) (load prediction target CPU). The load prediction target CPU II has a built-in load measurement tool (load measurement program) lla for measuring the load corresponding to its own operating state. 12 is the load prediction target CP
UII's high-speed MA (direct memory access) bus 13 is also a low-speed input/output bus. 14
15 is a channel replacement interface that connects to the DMA bus 12 and replaces some channels used in the actual operation system, and 15 connects to the human output bus 13 and replaces some channels used in the actual operation system. Channel alternative interface. Channel alternate interface 14 is connected to DMA bus I2, and channel alternate interface 15 is connected to input/output bus 13.

2) is a simulation CPU that includes a simulation program 21a that simulates program access on the CPU II in order to predict the load on the CPU II. In the simulation program 21a, parameters for simulation are prepared for each assumed system of various scales, and each parameter includes the type of channel (assumed channel), the number of channels for each type, and the channel number specific to each assumed channel. , and the access frequency for each assumed channel (estimated access frequency according to the assumed system).

The above parameters also include channel information such as the bus exclusive time of the channel corresponding to each type of assumed channel. Note that the type of assumed channel is unique to the bus to which the channel is connected in the actual operational system.

22 is a high-speed input/output bus for the simulation CPU 21, and MA bus 23 is also a low-speed input/output bus.

24 connects the simulation CPU 21 to the DMA bus 22
A connection interface 25 connects the simulation CPU 21 to the input/output bus 2 by connecting it to the channel alternative interface 14 via the load prediction target CPU II and the simulation CPU 2L.
This is a connection interface that connects the CPU II to be subjected to load prediction and the simulation CPU 21 to each other by connecting to the channel alternative interface 15 via the channel substitution interface 15 via the CPU 21.

Next, the operation of one embodiment of the present invention will be explained.

First, the load prediction target CPU 11 is designed to be able to operate in almost the same environment as in actual operation, and therefore is connected to at least a disk device (not shown) for storing programs. Now, the simulation CPU21
When the simulation program 21a is executed to start the simulation, various conditions simulating the assumed system are created according to the parameters set in the program, and several types of conditions within the assumed system indicated by the above parameters are created. The request for simulating access to the load-predicted CPU II from the assumed channel is handled at the frequency and interval according to the access frequency, bus exclusive time, etc. in the above parameters (the DMA to which the assumed channel should originally be connected Bus 12 or input/output bus 13
The channel alternate interface 14 or 15 connected to the DMA bus 22 or the input/output bus 23 is then notified one after another.

When the channel alternative interface 14 or 15 receives the notification from the simulation CPU 21, it replaces the bus (
A protocol signal on the DMA bus 12 or input/output bus 13) is generated in a simulated manner, and an access request is made to the load prediction target CPU II via the corresponding DMA bus 12 or input/output bus 13. This request causes the load prediction target CPU to
1l operates as if it were an access from various terminals (peripheral devices) or an interrupt from another computer.

As described above, the load prediction target CPU II operates in the operating environment (of the assumed system) simulated by the simulation CPU 21 (the channel substitution interfaces 14 and 15 that substitute channels in response to requests from the simulation CPU 21). The load prediction target CPU II measures the load in its own operating state using the load measurement tool lla built into the CPU II.
Load prediction is performed in hypothetical systems of various sizes simulated by the PU 21.

[Effects of the Invention] As detailed above, according to the present invention, systems of various sizes can be operated by operating the interface means for channel substitution by a simulation CPU independent of the CPU subject to load prediction. Since a simulated operating environment can be provided, simulations for predicting the load of large-scale computer systems can be performed with high accuracy without constructing an actual operational system.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention. 11... Load prediction target CPU, lla... Load measurement tool, 12.22... DMA bus, 13.23...
- Input/output bus, 14, 15...Channel alternative interface, 21...CPU for simulation, 21a
...Simulation program.

Claims (1)

[Claims] The various channels are connected to one or more connectable buses,
In a computer system equipped with a load prediction target CPU that has a built-in load measurement tool, there is an interface means that is independently connected to the bus and substitutes for various channels, and a A simulation program with parameters including the expected channel type, the number of channels of each type, the channel number of each channel, and the access frequency of each channel is executed, and a simulation program is executed according to the assumed system for accessing the CPU subject to the load prediction. and a simulation CPU that sequentially notifies the interface means connected to the target bus of a series of requests in accordance with the parameters, and the interface means transmits a protocol on the corresponding bus according to the requests from the simulation CPU. The load prediction target CPU is accessed by creating a simulation of the load prediction target CPU, and the load prediction target CPU measures the load corresponding to its own operating state accessed from the interface means using the load measurement tool to perform load prediction. A load prediction simulation method for a computer system characterized by being configured as follows.