JPH01102668A - Input/output control system - Google Patents

Abstract

PURPOSE:To shorten the overall time required for input/output actions to plural input/output devices by making an input/output controller receive plural commands at one time. CONSTITUTION:A processor 100 and an input/output controller 4 contain an input/output device parallel control means 300 and an input/output device state information means 400 respectively. The controller 4 analyzes the propriety for processing a received command and is ready to receive the next command after sending back the result of analysis as a status. Thus a central controller receives the status to a command and then immediately transmits the next command to ensure the input/output actions is parallel with each other. As a result, the controller 4 can receive plural commands at one time and therefore the overall time required for input/output actions is shortened to plural input/ output devices.

Description

[Detailed Description of the Invention] [Summary] This invention relates to an information processing system, and particularly to an input/output control method in an information processing system that includes a processing device and an input/output control device that controls input/output operations of a plurality of input/output devices. In particular, we aim to minimize the time required for input/output operations even in input/output control devices connected to many input/output devices that require long input/output operations. In an information processing system equipped with an input/output control device that controls input/output operations of multiple input/output devices based on a command, a command transmitted to the input/output control device to the processing device is subject to input/output control. If identification information that identifies the input/output device is added, and a status with the identification information added is returned from the input/output control device in response to the command, the input/output device determines that the next command to the input/output control device can be transmitted. A device parallel control means is provided, and when a command with identification information added is transmitted to the input/output control device from the processing device, it analyzes whether input/output control is possible for the input/output device specified by the identification information, and performs the analysis. As a result, a status notification with identification information for identifying the input/output device subject to input/output control is generated and sent back to the processing device. The configuration is such that an output device status notification means is provided.

[Industrial application field]

The present invention relates to an information processing system, and more particularly to an input/output control method in an information processing system that includes a processing device and an input/output control device that controls input/output operations of a plurality of input/output devices.

In an information processing system, an input/output control device that controls input/output operations of an input/output device that operates at low speed is attached to a processing device that operates at high speed, and the processing device inputs/outputs commands for input/output operations to the input/output device. A widely used method is to execute other processing after the signal is given to the control device, and leave control of the input/output operations of the input/output device to the input/output control device.

[Conventional technology]

FIG. 6 is a diagram illustrating an example of a conventional information processing system, and FIG. 7 is a diagram illustrating an input/output control method in FIG. 6.

In FIG. 6, a central control unit (CC) 1, a main memory W
(MM>2 and a channel control device (CHC) 3 are connected by a processor bus 11, and a channel control device 3 and an input/output control device (IOC) 4 are connected to an input/output bus 1
2.

The input/output control device 4 includes magnetic disk devices (DK) 5 and 6, a flexible disk device 7, and small computers 8 and 9 (input/output device 200 as necessary).
) are connected.

The input/output control device 4 controls input/output operations for the various input/output devices 200 based on commands transmitted from the central control device 1 via the channel control device 3.

6 and 7, the central controller 1 transfers data stored in the main storage device 2 to the magnetic disk device 5.
to the input/output controller 4 via the processor bus 11, the channel controller 3 and the input/output bus 12 in order to write to the
A write command a instructs to write data to the magnetic disk device 5.

After transmitting the data, a DMA transfer request C8 instructing the channel control device 3 to read the data to be written to the magnetic disk device 5 from the main storage device 2 and transfer it to the input/output control device 4 using the direct memory access control method. Communicate.

The channel control device 3 that received the DMA transfer request C3,
The write data dI specified by the DMA transfer request C1 is sequentially read from the main memory device 2 via the processor bus 11 and transmitted to the input/output control device 4 via the input/output bus 12.

On the other hand, the input/output control device 4 transmits an activation signal e1 to start a write operation to the magnetic disk device 5 designated by the received write command a1, and then transmits the start signal e1 to the channel control device 3.
After performing necessary format changes, etc. on the write data d transferred by , the write data d1 is sequentially transmitted to the magnetic disk device 5 as write data d1''.

When the required write data dl ° has been transmitted to the magnetic disk device 5 and the magnetic disk device 5 returns a completion signal f indicating the completion of writing the write data dI °, the input/output control device 4 Returns an end status gI indicating the end status of the input/output control device 4 and magnetic disk device 5 in response to the write operation by the write command a1 to the central control device 1 via the output bus 12, channel control device 3, and processor bus 11. do.

When the end status g1 is returned from the input/output control device 4, the central control device 1 performs the same process as described above in order to write other data stored in the main storage device 2 to the flexible disk device 7. After transmitting a write command a2 that instructs the input/output control device 4 to write data to the flexible disk device 7, the channel control device 3 stores the data to be written in the flexible disk device 7 in the main memory. When the device 2 transmits the DMA transfer request C2 to the input/output control device 4, the channel control device 3 and the input/output control device 4 send the activation signal e2 to the specified flexible disk device 7, as described above. After transmitting the data, the designated write data d2 is sequentially read out from the main storage device 2, converted to write data d21, and then sent to the flexible disk device 7.
When writing of the required write data d21 to the flexible disk device 7 is completed and a completion signal f2 is returned from the flexible disk device 7, a completion status g2 is sent back to the central control device 1.

[Problem that the invention seeks to solve]

As is clear from the above explanation, in a conventional information processing system, the input/output control device 4 can only receive one command at a time, and the central control device 1 has an end time for the transmitted write command a. Until the command g1 was received, no other write command a2 could be transmitted.

Therefore, especially in the input/output control device 4 to which a large number of input/output devices that require long input/output operations are connected, the overall input/output operation time may be extended.

An object of the present invention is to make it possible to shorten the input/output operation time as much as possible even in an input/output control device in which a large number of input/output devices that require long input/output operations are connected.

[Means for solving problems]

FIG. 1 is a diagram showing the principle of the present invention.

In FIG. 1, 100 is a processing device, 200 is an input/output device, and 4 is an input/output control device that controls input/output operations of a plurality of input/output devices 200 based on commands from the processing device.

300 is input/output device parallel control means provided in the processing device 100 according to the present invention.

Reference numeral 400 denotes input/output device status notification means provided in the input/output control device 4 according to the present invention.

[Effect]

The input/output device parallel control means 300 includes input/output devices 2 to be subjected to input/output control in a command transmitted to the input/output control device 4.
00 is added, and when a status with the identification information added is returned from the input/output control device 4 in response to the command, it is determined that the next command to the input/output control device 4 can be transmitted.

When the input/output device status notification means 400 receives a command with identification information added from the processing bag W100, it analyzes whether input/output control is possible for the input/output device 200 specified by the identification information, and applies the analysis result to the input/output device status notification means 400. A status notification with identification information for identifying the input/output device 200 to be input/output controlled is generated and sent back to the processing device 100, and after the status notification is returned, the next command can be received.

Therefore, the input/output control device can receive multiple commands at the same time, and the input/output operation time for multiple input/output devices can be reduced overall.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

2 is a diagram showing an information processing system according to an embodiment of the present invention, FIG. 3 is a diagram illustrating the input/output control method in FIG. 2, and FIG. 4 is a diagram illustrating the command configuration in FIG. 3. FIG. 5 is a diagram illustrating the status configuration in FIG. 3. Note that the same reference numerals indicate the same objects throughout the figures.

In FIG. 2, a parallel control unit (IDC) 101 is provided in the central control unit (CC) 1 as the input/output device parallel control means 300 in FIG. 1, and the input/output device status notification means in FIG. As 400, a status return unit (ISS) 401 is provided within the input/output control device (IOC) 4.

Further, in FIG. 4, identification information (ID) indicating the input/output device 200 to be subjected to input/output control is included in various commands (CMD) transmitted from the central control device 1 to the input/output control device 4.
are added, and in FIG. 5, various statuses (S
TT), identification information (10) indicating the input/output device 200 to be subjected to input/output control is added.

In FIGS. 2 to 5, the central controller 1 activates the parallel control unit 101 in order to write data stored in the main memory (MM) 2 to the magnetic disk device (DK) 5,
As shown in FIG. 4, a write command a is created with the identification information ID of the magnetic disk device 5 targeted for input/output control, and the processor bus 11 and channel control device (CH
C) 3 and the input/output control device 4 via the input/output bus 12
to communicate.

The input/output control device 4 that received the write command a activates the status return unit 401 and sends the received write command a,
The individual response unit 403, which directly controls input/output operations for the magnetic disk device 5 specified by the identification information ID, is operable or not. If it is determined to be operable, further input/output operations are performed. A transfer common control unit (MTC) 402 that commonly controls data transfer for each input/output device 200 controlled by the output control device 4 analyzes whether or not it is operable, and if it is determined that it is operable, the write As shown in FIG. 5, the identification information ID of the magnetic disk device 5 to be subjected to input/output control is added to the command reception status b indicating that the input command a can be processed, and the input/output bus 12, Channel controller 3 and processor bus 11
The data is sent back to the central control device 1 via.

The central control unit 1 that received the command reception status b
Based on the write command a1 (determines that input/output control is executable), sets the parallel control unit 101 to a state in which a new input/output control command can be transmitted, and also sends a command to the channel control device 3. A DMA transfer request c is transmitted to instruct that data to be written in the magnetic disk device 5 be read from the main storage device 2 and transferred to the input/output control device 4 using the direct memory access control method.

The channel control device 3 that received the DMA transfer request C optically sends the DMA transfer request C.
The write data d specified by the DMA transfer request c is sequentially read from the main memory device 2 via the processor bus 11 and transmitted to the input/output control device 4 via the input/output bus 12.

On the other hand, the input/output control device 4 transmits, based on the received write command a, an activation signal e for starting a write operation to the designated magnetic disk device 5 through the individual handling unit 403, and then After the control unit (MTC) 402 and the individual handling unit 403 perform necessary format changes on the write data d transferred by the channel control device 3,
The data is sequentially transmitted to the magnetic disk device 5 as write data dl'.

On the other hand, when a request to write other data stored in the main storage device 2 to the flexible disk device 7 occurs, the central control device 1 activates the parallel control section 101 in the same manner as described above, and controls input/output. A write command a2 to which the identification information ID of the flexible disk device 7 is added is transmitted to the device 4. - Input/output control device 4 that received write command a2
As described above, the individual response unit 404 starts the status return unit 401, analyzes the received write command a2, and directly controls the input/output operation for the flexible disk device 7 specified by the identification information ID. If it is determined to be operable, the transfer common control unit 402 further analyzes whether or not it is operable, and if it is determined to be operable, write command a2 The identification information 10 of the flexible disk device 7 is added to the command reception status b indicating that the command can be processed, and the information is returned to the central control device 1.

Further, the input/output control device 4 sends a start signal e2 to the individual support unit 40 to start a write operation to the designated flexible disk device 7 based on the received write command a2.
4.

On the other hand, the transfer common control unit 402 and the individual handling unit 403 have finished transmitting the required write data d, l to the magnetic disk device 5, and the magnetic disk device 5 sends a completion signal f indicating the end of writing the write data d, l. .

is returned, the input/output control device 4 sends the central control device 1 an end status g+ indicating the end status of the input/output control device 4 and the magnetic disk device 5 for the write command a.
to be sent back.

After the completion status gI is returned from the input/output control device 4, the central control device 1 instructs the channel control device 3 to transfer the data to be written to the flexible disk device 7 from the main storage device 2 to the input/output control device 4. DMA transfer request Ct to be transferred
Communicate.

Similarly to the above, the channel control device 3 and the input/output control device 4 sequentially read the specified write data d2 from the main storage device 2, convert it into write data d2'', and sequentially transmit it to the flexible disk device 7. do.

On the other hand, when the central controller 1 receives the command acceptance status b2 for the write command a2, the parallel controller 10
1 is in a state where new input/output control commands can be transmitted, so when a request to write other data stored in the main storage device 2 to the flexible disk device 7 occurs, the same process as described above occurs. A write command a to which the identification information ID of the flexible disk device 7 is added is transmitted to the input/output control device 4.

The input/output control device 4 that has received the write command a3 activates the status return unit 401, analyzes the received write command a3, and sends the flexible disk device 7 specified by the identification information ID in the same manner as described above. The individual response unit 404 analyzes whether or not it is operable, and if it is determined that it is not operable because the flexible disk device 7 is currently in the writing operation, the write command a2 cannot be processed. The identification information ID of the flexible disk device 7 is added to the in-use status b indicating that the flexible disk device 7 is in use, and the information is returned to the central control device 1.

The central control device 1 analyzes the in-use status b3 returned from the input/output control device 4 using the parallel control unit 101,
If it is determined that the input/output operation based on the write command a is not possible, the input/output operation based on the write command a3 is stopped.

- The friend input/output control device 4 receives a completion signal f from the flexible disk device 7 that has completed the writing operation of the write data d and f.
2 is returned, the end status g! is sent to the central controller 1. to be sent back.

As is clear from the above description, according to this embodiment, when the input/output control device 4 receives one command, it analyzes whether it can be processed and returns the analysis result as a status.
Since the next command can be received, the central control unit 1
After receiving the status for one command, it immediately transmits the next command, enabling parallel input/output operations.

Note that FIGS. 2 to 5 are only one embodiment of the present invention, and for example, the input/output device 200 that is the target of input/output operations.
The types of information and the transmission/reception process of various commands and statuses are not limited to those shown in the drawings, and many other modifications may be considered, but the effects of the present invention remain the same in any case. Furthermore, it goes without saying that the information processing system to which the present invention is applied is not limited to what is illustrated.

〔Effect of the invention〕

As described above, according to the present invention, in the information processing system, the input/output control device can receive a plurality of commands at the same time, and the input/output operation time for the plurality of input/output devices can be reduced overall.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the principle of the present invention, FIG. 2 is a diagram showing an information processing system according to an embodiment of the present invention, FIG. 3 is a diagram illustrating the number input/output control method in FIG. 4 is a diagram illustrating the command configuration in FIG. 3, FIG. 5 is a diagram illustrating the status configuration in FIG. 3, FIG. 6 is a diagram illustrating an example of a conventional information processing system, and FIG. 7 is a diagram illustrating the status configuration in FIG. It is a figure which illustrates the input-output control method in a figure. In the figure, 1 is the central controller (CC), 2 is the main memory (MM), 3 is the channel controller (CHC), 4 is the input/output controller (IOC), and 5 and 6 are the magnetic disk units (DK). , 7 is a flexible disk device, 8
9 is a small-scale computer, 11 is a processor bus, 12 is an input/output bus, 100 is a processing unit, 101 is a parallel control unit (IDC), 200 is an input/output device, 300 is an input/output device parallel control means, 400 is an input/output device Output device status notification means, 401 is a status return unit (ISS), 402 is a transfer common control unit (MTC), and 403 to 406 are individual response units. Agent Patent Attorney Sada Igata - 7-Fist Drawing Shen JA Diagram 1 Figure/Pz Diagram/SJ゛/#Inputffi ForceQ7A'Spear 3 Diagram 1

Claims (1)

[Scope of Claims] A processing device (100) and an input/output control device (4) that controls input/output operations of a plurality of input/output devices (200) based on commands from the processing device (100). In the information processing system, the processing device (100) adds identification information for identifying the input/output device (200) to be subjected to input/output control to a command to be transmitted to the input/output control device (4); In response to the command, the input/output control device (4)
An input/output device parallel control means (300) is provided which determines that the next command to the input/output control device (4) can be transmitted when the status with the identification information added is returned from the input/output control device (4). 4), when a command with the identification information added is transmitted from the processing device (100), analyze whether or not input/output control is possible for the input/output device (200) specified by the identification information; A status notification is generated by adding identification information for identifying the input/output device (200) subject to the input/output control to the result and sent back to the processing device (100), and after returning the status notification, the An input/output control method characterized by providing input/output device status notification means (400) that enables reception of the next command.