JPH05313924A - Measuring mechanism for virtual computer - Google Patents

Abstract

PURPOSE:To maintain the performance of a virtual computer system and to secure the high measuring accuracy of the operating time of a virtual computer by providing a mechanism to measure the operating time of the virtual computer kept in a wait state. CONSTITUTION:When a working virtual computer 104 is brought into a wait state, a wait state measuring mechanism starts to measure the time when an interruption is applied to the computer 104 and accumulates these measured time. This operation is repeated every time the computer 104 is brought into a wait state after the operation of the computer 104 is interrupted and the control is given again to a virtual computer control program VMCP 102. When the VMCP 102 is controlled again, the accumulated value of time is given to the VMCP 102. Thus, the VMCP 102 adds the received value to the value (the time measured by an SIE instruction and covering from the start of operation of the virtual computer to the return of control to the VMCP 102) measured by a conventional method in order to know the operating time of the computer 104. In such a constitution, the performance of a virtual computer system is maintained and the high measuring accuracy is secured for the operating time of a virtual computer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to control and tuning of a virtual computer system, and in particular, enables tuning of a virtual computer system of a method of maintaining the performance of the virtual computer by continuing the operation of the virtual computer. Related to the mechanism.

[0002]

2. Description of the Related Art In a virtual computer system, a virtual computer control program (hereinafter referred to as VMCP) operates each virtual computer on a real computer in time division based on an execution ratio designated by an operator. I am letting you.

At this time, the VMCP allocates a divided execution time (hereinafter referred to as a time slice) to each virtual computer according to a given execution ratio, but since the operation of the virtual computer fluctuates, the execution time of the virtual computer is measured, It is necessary for the operator to tune the execution ratio based on the execution time information and give an optimum time slice to each virtual computer.

As a publicly known example for disclosing a technique related to the resource management of this kind of virtual computer system, Japanese Patent Laid-Open No. 64-64-
2145 and so on.

[0005]

As described above, the measurement of the execution time of the virtual machine is a technique necessary for the operation of the virtual machine system. Generally, the virtual machine operation command (hereinafter referred to as SIE command) issued by the virtual machine control program is used. This is realized by measuring the time until the operation of the virtual machine is started, the operation of the virtual machine is interrupted, and the control returns to VMCP (hereinafter referred to as interception).

[0006] Here, when the virtual machine falls into the wait state, interception is caused to eliminate the overhead of the wait time and guarantee the accuracy of the measured execution time of the virtual machine.

At this time, the processing of the interrupt reported to the virtual machine is realized by the simulation by VMCP, but since it consumes a large processing step as compared with the case where the virtual machine itself processes the interrupt, the virtual machine is processed. There was a problem that system performance deteriorated.

Therefore, when the virtual machine falls into the wait state, it is possible to suppress the interception and suppress the deterioration of the system performance. In this case, however, since the wait time of the virtual machine is included in the measurement time, the execution time is reduced. There was a problem that the measurement accuracy was not guaranteed.

An object of the present invention is to provide a method for guaranteeing the measurement accuracy of the execution time of a virtual machine in which the interception is suppressed when the virtual machine is waiting.

[0010]

In order to achieve the above object, the present invention is provided with a mechanism for measuring the operating time of a virtual computer in a wait state, and the measured information is given to a VMCP to obtain the conventional measured information. Together with this, the VMCP obtains accurate execution time information of the virtual machine.

[0011]

When a virtual computer in operation enters a wait state, a mechanism for measuring the wait state is activated, and the time until an interrupt is input to the virtual computer is measured and accumulated. This interrupts the operation of the virtual computer and the VMCP. It repeats every time the virtual machine enters the wait state until control is returned to. When the control returns to VMCP, the cumulative value is given to VMCP, and VMCP is the value measured by the conventional method (the operation of the virtual machine by the SIE instruction). (Measurement value until starting and returning to VMCP)
You can know the execution time of the virtual machine together with
In this way, the present invention can maintain the performance of the virtual computer system and secure the measurement accuracy of the virtual computer execution time.

[0012]

1 is a block diagram of an embodiment of a virtual computer system according to the present invention.

The computer 101 is a VM that controls a virtual computer.
CP 102, virtual machine 104 operating under VMCP 102, SIE mechanism 105 for realizing SIE instructions,
It has a state description 108, which is an operand of the SIE instruction, and a timing mechanism (hereinafter referred to as TOD) 125 of a calculator.

The VMCP 102 is stored in an external storage device (not shown) in the initial state of the computer, and is loaded and activated in a main storage device (not shown) by an activation operation by an operator of the virtual computer system. The virtual computer 104 and the state description 108 are generated on the storage device.

It is also assumed that the operator can operate the setting of the virtual computer operating environment of the VMCP 102 by a console device (not shown).

The VMCP 102, the SIE mechanism 105, and the virtual machine 104 are provided with an interface 106 for realizing the activation and interception of the virtual machine 104, and a normal storage device access is provided between the VMCP 102 and the state description 108. The means 110, the SIE mechanism 105 and the state description 108 are provided with access means 111 for reading and writing operands.

Inside the SIE mechanism 105, the virtual computer 10
The weight state measuring mechanism 107 which is a mechanism for measuring the weight state of No. 4 is provided, and the flag 12 is provided therein.
3, the time storage means 121 and 122 are provided as registers, and the weight state measuring mechanism 107 is TOD.
The time can be read out from 125, and the value has sufficient accuracy for measurement.

The state description 108 is provided with a flag 120 for activating / deactivating the weight state measuring mechanism 107, and time information 124 which is a storage unit for referring to the time measured by the VMCP 102.

Next, the operation of the virtual computer system shown in FIG. 1 will be described with reference to FIGS.

Here, it is assumed that the VMCP 102 is already in an operable state and the virtual machine 104 has been created in the main storage device.

When the VMCP 102 starts the operation of the virtual machine, the 102 sets the initial value in the time information 124, sets the flag 120, and issues the SIE instruction (step 20).
1), SIE mechanism 105 and weight state measuring mechanism 10
7 starts operation. After that, when the SIE mechanism 105 starts its operation, the weight state measuring mechanism 107 automatically starts its operation.

At this time, whether the flag 120 is set or not set depends on the setting operation of the virtual computer operating environment of the VMCP 102 by the operator.

The activated SIE mechanism 105 has a flag 12
If 0 is determined (step 202) and the flag 120 is set, the weight state measuring mechanism 107 sets the value of the time information 124 to which the initial value is set in the time storing means 122 (step 203), and then the SIE mechanism 105. This causes the virtual computer 104 to start operating.

When the virtual computer 104 enters a wait state while operating (step 204), the SIE mechanism 105 intervenes to determine the flag 120 (step 205), 120
If is set, the weight state measuring mechanism 107 reads the time from the TOD and sets the time in the time storage means 121 (step 206). Further, a flag 123 indicating that the weight state is being measured is set (step 207), and then 105. The wait state is continued until the intervention is ended and an interrupt occurs. If 120 is not set, the SIE mechanism 105 intercepts and transfers control to the VMCP 102 (step 208). In this case, the same processing as in the conventional case is performed.

When an interrupt occurs in the virtual computer 104 in the wait state (step 209), the SIE mechanism 105 intervenes, and the wait state measuring mechanism 107 judges the flag 123 (step 210). The time is read from TOD and the difference between the time and the value of the time storage means 121 is calculated to calculate the time during which the wait state of the virtual machine 104 continues, and the value and the content of the time storage means 122 are added to 122 (Step 211), and then the flag 123 is cleared to indicate that the measurement of the weight state is completed (step 212),
The process returns to normal interrupt processing (step 213). With this, the wait time of the virtual computer 104 is stored in the time storage means 122.
Was added to.

The weight processing of the virtual computer 104 may be repeated a plurality of times during the operation of the virtual computer. In that case, steps 204 to 213 are repeated and the measurement time is accumulated in the time storage means 122.

The flag 123 is provided here in step 2 when an interrupt occurs during normal operation of the virtual machine.
This is to prevent the operation of 11 and prevent malfunction.

When interception occurs in the virtual machine 104 by the SIE mechanism 105 (step 214),
Reference numeral 105 determines the flag 120 to determine the weight state measuring mechanism 1
07 sets the value of the time storage means 122 in the time information 124.

As a result, when the control returns to the VMCP 102, the wait time of the virtual computer 104 can be known. Interception occurs when the virtual machine 104 runs out of time slices, or when the SIE mechanism 105 determines that a privileged instruction issued at 104 affects the virtual machine system.

The VMCP 102 uses SI as in the conventional method.
The time from issuing the E instruction to the time when the virtual computer 104 operates and the control returns to 102 by the interception is measured, and it is necessary to know the accurate execution time of the virtual computer 104 together with the wait time information obtained above. You can

It should be noted here that the flag 120 is set by the VMCP 102 so that the interception during the wait of the virtual machine is suppressed and the interrupt is directly executed by the virtual machine.

Further, by not setting the flag 120, it is possible to cause an interception in the virtual machine and measure the execution time of the virtual machine by the same method as the conventional method.

Here, it may be considered that the time storage means 122 is not provided and the wait time information is directly accumulated in the time information 124 in step 211. In that case, step 203,
Although 216 can be omitted, the SIE instruction and interception processing, which causes a non-negligible overhead accompanied with access to the main storage device in the interrupt processing and affects the virtual computer execution performance, generally involves a lot of processing. Step 203 by accessing the main memory to spend steps
The 216 overhead is less of a problem.

In the embodiment of FIG. 1, the number of virtual machines is one. However, when operating a plurality of virtual machines, the number of virtual machines operating at one time point is one. Therefore, as shown in FIG. Even if it is expressed by one, the generality is not lost.

Next, FIG. 4 is a part of a configuration diagram of another embodiment of the virtual computer system according to the present invention. The overlapping part with the previous embodiment is omitted, that is, the SIE mechanism 10 in FIG.
5 is the SIE mechanism 300 and program state word 30 of FIG.
The whole picture is replaced with 3.

Here, the SIE mechanism 300 has a weight state measuring mechanism 301 inside, and 301 is the time storage means 30.
A counter 305 capable of periodically counting up the contents of 2 and 302 is provided. The SIE mechanism 300 is wired so that it can receive the state of the wait bit 304 of the program state word 303 indicating the wait state of the computer, and when the SIE mechanism 304 stands up and the computer enters the wait state, it is SI.
The weight state measuring mechanism 301 is instructed by the E mechanism 300.
Started counting up in parallel with the operation of the computer, 30
It is configured to stop counting when 4 is dropped.

The operation of the time storage means 302 for explaining the operation of the virtual computer system shown in FIG. 4 is the same as that of the time storage means 122 in FIG. 1, that is, the initial value is set from the time information 124 in the SIE instruction and the interface is set. Write back to 124 with the separation.

Next, the count-up processing in this embodiment will be described with reference to FIG. 5. The SIE instruction and interception processing are the same as in the previous embodiment, and will be omitted. When the virtual computer enters the wait state (step 310), the SIE mechanism 3
00 intervenes to determine the flag 120 (step 31
1) If 120 is standing, the SIE mechanism 300 issues a count start instruction to the weight state measuring mechanism 301 (step 314), and the counter 305 starts counting up in parallel with the operation of the computer (step 311). The time interval for counting up should be sufficient for measurement accuracy. Thereafter, the intervention of 300 is completed and the wait state is continued until an interrupt occurs (step 315). If 120 is not set, the SIE mechanism 301 performs the interception and the control is transferred to the VMCP (step 31).
2).

When an interrupt occurs in the virtual computer in the wait state (step 316), the interrupt process of the virtual computer causes the program status word 303 to be loaded with data from the storage device. At this time, the wait bit 304 is interrupted. It is cleared by the processing (step 317), the count stop signal is sent to the weight state measuring mechanism 301, the counter 305 is stopped, and the wait time of the virtual machine is accumulated in the time storage means 302.

As described above, in this embodiment, the same effect as that of the previous embodiment can be obtained, and the step 20 in FIG.
6, 207 and steps 211 and 212 in FIG. 3 are unnecessary, and the wait and interrupt processing is speeded up. However, although the previous embodiment can be realized by a microprogram,
In this embodiment, since it cannot be realized without using a logic circuit,
It cannot be implemented easily and inexpensively as compared with the previous embodiment.

[0041]

As described above, according to the present invention, the performance of the virtual computer system can be maintained and the measurement accuracy of the virtual computer execution time can be secured.

[0042]

[Brief description of drawings]

[Figure 1]

FIG. 4 is a diagram showing an embodiment of a method for measuring virtual computer execution time by the virtual computer system according to the present invention.

[Fig. 2]

[Figure 3]

FIG. 5 is a diagram showing a processing flow of a method for measuring a virtual computer execution time.

[Explanation of symbols]

101 computer 102 VMCP 104 virtual computer 105 SIE mechanism 106 SIE interface 107 weight status measuring mechanism 108 state description 110 storage access means between 102 and 108 access means for operand reading and writing between 105 and 108 120 flag 121 time storage means 122 time storage means 123 flag 124 time information 125 TOD 300 SIE mechanism 301 wait state measuring mechanism 302 time storage means 303 program state word 304 weight bit 305 counter

Claims (2)

[Claims] 1. In order to control at least two or more virtual machines, a virtual machine operation command issued by a virtual machine control program starts the operation of the virtual machine, and the operation of the virtual machine is performed by a virtual machine system. When the virtual machine enters the wait state so that the virtual machine can directly execute an interrupt, it has an execution mode machine that interrupts the operation of the virtual machine and returns control to the virtual machine control program when it affects the operation. In a virtual machine system having a mechanism in which control is not returned to the virtual machine, the virtual machine system is characterized by having a mechanism for measuring the operating time of the virtual machine in a wait state and a mechanism for giving the measurement information to the virtual machine control program. 2. The operator of a virtual computer system according to claim 1, wherein a mechanism for measuring a wait time of the virtual computer is interlocked with a mechanism that does not return control of the virtual computer that has entered the wait state to the virtual computer control program. A virtual computer system characterized by being restrained or operated by a virtual computer control program triggered by an operation by.