JPS6238739B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control device for efficiently operating an information processing system.

Recently, there has been a trend to incorporate the concept of virtual memory into computer architectures to improve the efficiency of software memory management. A paging method is one of the virtual memory methods. This divides the program (including data) into pages of appropriate size (usually 2KB or 4KB), and allocates and loads memory areas for the program in units of pages. Programs are created without being aware of the concept of pages or the memory size of the system. When the program is executed, if a page that is not allocated in memory is accessed, an interrupt is generated (missing page interrupt), and the operating system's memory management routine evicts other unnecessary pages (page out). ), after calling the necessary page (page-in), the program starts executing. By adopting such a virtual memory approach, the operating system and the programs executed under it can perform multi-job control (a job is one execution unit of a program) or be programmable without being limited by the actual memory capacity. It has the following advantages. However, in a system that employs a virtual memory method, the memory capacity can be considered infinite, so if jobs are continuously input using multi-jobs and the degree of job multiplicity is increased, the number of page-ins and page-outs described above will increase. In general, the number of page-ins/page-outs per unit time is called the paging rate, and as this value increases, the system spends more time processing interrupts, input/output, etc. associated with page-ins/page-outs than actual job processing. Since it takes time, so-called system overhead increases and the throughput of the system decreases. On the other hand, when the paging rate decreases, there is a tendency for the system to spend more time doing nothing, that is, idle time, and there is room to further increase the throughput of the system by increasing the job multiplicity. Therefore, the operating system constantly monitors this paging rate, and if the paging rate becomes high, it stops submitting jobs and rescheduling, and conversely, if the paging rate decreases, it allows jobs to be submitted and starts new scheduling. It is necessary to ensure that the system operates in a well-balanced manner. However, this method has the disadvantage that monitoring the paging rate itself involves overhead.

An object of the present invention is to automatically execute operator commands to control job submission and scheduling when a condition that requires some change in job submission and scheduling is detected, without making any changes to the operating system. The object of the present invention is to provide a control device that solves the above-mentioned drawbacks and operates the system in a well-balanced manner.

The present invention comprises: a measuring means for outputting measured values in time series; a first storing means for storing an upper limit value; a second storing means for storing a lower limit value; a first operation mode in which a first interrupt signal is output when the output value of the measuring means exceeds the upper limit value stored in the second storage means; and If one of the second operation modes is adopted in which a second interrupt signal is output when the signal falls below the first and second interrupt signals, and one of the first and second interrupt signals is output. a comparison means for shifting the operating mode of the computer to the other, a message generation means for generating control commands corresponding to the first and second interrupt signals, and a control command generated by the message generation means and input to the console device. The control device is characterized by having a switching means for switching messages and transmitting the messages to an information processing subsystem.

Next, the present invention will be explained in detail with reference to the drawings. In FIG. 1 showing an embodiment of the present invention, this control device inputs a missing page interrupt signal 111 generated in the information processing subsystem 7, and outputs an interrupt signal indicating when to submit a job and when to stop or start a schedule. 121 and 122, the console device 5, the interrupt signals 121 and 122 of the monitoring device 1, the message transmission signal 151 of the console device 5, and the console input message transmission signal 152 as inputs, and an information processing subsystem. 7, and a message generating device 3 which outputs message transmission signals 137 and 138. The monitoring device 1 is the information processing subsystem 7
The missing page interrupt signal 111 is input, and the paging rate (number of missing page interrupts occurring per unit time) is calculated while counting it. If the paging rate exceeds a predetermined upper limit, an interrupt signal 121 is sent to the message generating device 3, and if the paging rate is below a lower limit, an interrupt signal 122 is sent to the message generating device 3.
The message generator 3 receives an interrupt signal 121 or 1
22 to send a message transmission signal 137 to the information processing subsystem 7, an interrupt signal 121 to generate an operator command to submit a job and stop scheduling, and an interrupt signal 122 to submit a job and start scheduling. The message transmission signal 138 is transmitted to the information processing subsystem 7 by generating an operator command to perform the same. Incidentally, when the console device 5 is transmitting a message to the information processing subsystem 7 via the message generating device 3, it waits for the transmission to be completed before generating the message transmitting signal 137 and the operator command. The information processing subsystem 7 inputs jobs and stops or starts scheduling in response to operator commands inputted through a signal 138, and operates so as not to reduce the throughput of the system while adjusting the multiplicity of jobs. The monitoring device 1 takes care not to interrupt continuously under the same conditions so as not to cause overhead to the information processing subsystem 7.

Next, referring to FIG. 2, the monitoring device 1 shown in FIG.
An example of the configuration and its operation will be explained. In FIG. 2, 1 indicates a monitoring device, 11 a counter,
12 and 13 are registers for storing upper and lower limit values, respectively; 14 is a flip-flop; and 15 is a timing generation circuit. The counter 11 is a normal counter that constantly counts the pulses of the missing page interrupt signal 111, is reset by the timing circuit 15, and then resumes counting. The value of register 12 (upper limit value) and the value of register 13 (lower limit value) are stored in flip-flop 14.
is selected based on the value of , and compared with the value of the counter 11 in the comparator circuit 19 . 16 and 17 are AND gate groups, and 18 is an OR gate group. When the flip-flop 14 is "0", the comparator circuit 1
If the flip-flop 14 is "1", the value of the input signal 118 of the comparator 19 becomes the value of the register 13 (lower limit). The meaning of the output signal of the comparison circuit 19 changes depending on the value of the flip-flop 14. That is, when the value of the flip-flop 14 is "0", the value of the counter 11≧the value of the register 12; when the value of the flip-flop 14 is "1", the value of the counter 11≦the value of the register 13, the output signal 119 becomes " It becomes 1”. The configuration of the comparator circuit 19 can be easily realized by a subtraction circuit of (value of counter 11) - (value of counter 12 or 13) and an exclusive OR circuit of the most significant bit representing the positive or negative of the result and the value of flip-flop 14. can.

The timing generation circuit 15 outputs a pulse 113 at regular intervals. By outputting this pulse, the comparison circuit 19 is enabled through the AND gate 20 and becomes the output signal line 120. AND gates 21 and 22 output interrupt signals 121 and 12, respectively, by ANDing signal 120 with output signal 116 or 117 of flip-flop 14.
Outputs 2. Interrupt signal 121 indicates that the paging rate has exceeded the upper limit, and interrupt signal 122 indicates that the paging rate has fallen below the lower limit. Interrupt signals 121 and 122 are outputs of the monitoring device 1, and if either value is "1", the state of the flip-flop 14 is inverted through the OR gate 23.

Now, consider the case where the value of flip-flop 14 is "0". In this case, the monitoring device 1 generates a counter 1 every time an output pulse of the timing generation circuit 15 is generated.
It monitors whether the value of 1 ≧ the value of register 12 (upper limit value), and when this condition is satisfied, interrupt signal 121 is output.
At the same time, the value of the flip-flop 14 is inverted and becomes "1". From then on, the monitoring device 1 monitors whether the value of the counter 11 ≦ the value of the register 13 (lower limit value) every time the output pulse of the timing circuit 15 is generated, and when this condition is met, the interrupt signal 122 is When the value is set to "1", the value of the flip-flop 14 is inverted and becomes "0". This operation is repeated in the same manner.

Next, an example of the configuration and operation of the message generating device 3 shown in FIG. 1 will be described with reference to FIG. 3. 3 indicates a message generator, 31 and 3
2 designates latch circuits that hold interrupt signals 121 and 122 from the monitoring device 1, respectively, and 151
and 152 indicate a message transmission signal line and a console input message transmission signal of the console device 5, respectively, 36 a register storing operator commands for submitting a job and stopping scheduling, and 37 for submitting a job and starting a schedule. A register storing an operator command is shown, and 38 is a selector for selecting either register 36 or 37 according to the output signal 132 of latch circuit 32. The output signal 133 of the OR gate 33 indicates that the output of the monitoring device 1 has been received. The AND gate 34 suppresses the transmission of operator commands while the message transmission signal 151 of the console device is “1” even if the output of the interrupt signal 121 or 122 from the monitoring device 1 is “1”, and Device message transmission signal 15
1 is “0” and interrupt signal 12 from monitoring device 1
When the output of 1 or 122 is "1", it operates as a changeover switch to enable transmission of operator commands. The output signal 134 of the AND gate 34 transmits a message transmission signal 137 to the information processing subsystem 7 through the OR gate 35.
The operator command selected by the selector 38 is validated and a message is sent to the information processing subsystem 7 through the OR gate group 40.

Now, the interrupt signal 121 from the monitoring device 1 is “1”
Consider what happens if you become The interrupt signal 121 from the monitoring device 1 is the output signal 131 from the latch circuit 31.
is set to “1” and output signal 1 from OR gate 33
Set 33 to “1”. If the message transmission signal 151 of the console device 5 is “1”, the output of the AND gate 34 is “0”, and the output of the OR gate 35 is “1”.
The message transmission signal 137 output from the console device 1 is the transmission signal 151 of the console device 1 . or,
Output signal 136 from AND gate 39 is “0”
Therefore, the message transmission signal 138 output from the OR gate group 40 becomes the message input at the console device 5. If the message transmission signal 151 of the console device 5 is “0”, AND
The output signal 134 from the gate 34 becomes "1", and the message transmission signal 137 output from the OR gate 35 is transmitted to the information processing subsystem 7 as the message transmission signal of the message generating device. On the other hand, since the output signal 132 from the latch circuit 32 is "0", the selector 38 outputs the data of the register 36 storing the operator command for stopping job submission and scheduling.
Output signal 134 from AND gate 34 is “1”
Therefore, the output signal 136 from the AND gate group 39 becomes the operator command selected by the selector 38, and is sent to the information processing subsystem 7 as a message transmission signal 138, which executes job input and schedule stop, and sends the information processing subsystem to the information processing subsystem 7. Reduces the overhead of 7. Also, the other interrupt signal 122 from the monitoring device 1 is “1”.
In this case, the message sent to the information processing subsystem 7 becomes an operator command for submitting a job and starting a schedule, and the operation is the same as described above except that the idle time of the information processing subsystem 7 is reduced.

As can be seen from the above description, the features of the present invention are that monitoring, which was conventionally performed by an operating system, is implemented in hardware to reduce overhead;
This reduces overhead by not issuing operator commands for the same event more than once in a row.

In this embodiment, the measured value is explained as the number of missing page interrupts, but other values may include the number of IO interrupts, cache memory no-hit interrupts, etc.

As explained above, the present invention monitors the number of events that occur within a certain period, and when a certain condition is reached, generates a command to control the system load and changes subsequent monitoring conditions. This configuration has the effect of efficiently operating the system without generating extra control commands.

[Brief explanation of the drawing]

1 is a block diagram showing an embodiment of the control device according to the present invention, FIG. 2 is a block diagram showing an example of the monitoring device shown in FIG. 1, and FIG. 3 is a block diagram showing an example of the message generating device shown in FIG. 1. It is a diagram. 1... Monitoring device, 3... Message generator,
5... Console device, 7... Information processing subsystem, 11... Counter, 12, 13... Register, 14... Flip-flop, 15... Timing generation circuit, 19... Comparison circuit, 31, 32...
...Latch circuit, 36, 37...Register, 38...
…selector.

Claims (1)

[Claims] 1. A measuring means for outputting measured values in time series, a first storing means for storing an upper limit value, a second storing means for storing a lower limit value, and an output value of the measuring means is stored in the first storing means. a first operation mode in which a first interrupt signal is output when the output value of the measuring means exceeds the upper limit value stored in the second storage means; one of the second operation modes in which a second interrupt signal is output when the first and second operation modes are output when either one of the first and second interrupt signals is output; a message generating means for generating control commands corresponding to the first and second interrupt signals, respectively, and switching between the control command generated by the message generating means and the input message of the console device. A control device comprising: switching means for transmitting information to an information processing subsystem.