JPH0434637A - Input/output starting system for information processor - Google Patents

Abstract

PURPOSE:To reduce the load of the uppermost microprogram and to improve the processing performance of the whole I/O processor by checking whether a channel is in use or not by the 1st channel control part controlled by a lower microprogram. CONSTITUTION:Whether a channel is in use or not is checked by the 1st channel control part 51 (52) controlled by a lower microprogram and it is unnecessary for the 2nd channel control part 4 controlled by the uppermost microprogram to recognize whether the channel is in use or not. since the uppermost microprogram is not required to check the status of the lower microprogram, communication between microprograms is not complicated and a useless start request is not generated from the uppermost microprogram. Consequently, the load of the upper most microprogram can be reduced and the processing performance of the whole I/O device 31 (32) can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an input/output activation method for selecting an access path to an input/output device and performing an input/output operation in an information processing device.

[Prior Art] In a conventional input/output activation method for an information processing device, a queue is provided in a common area of a storage device that can be accessed by the central processing unit and the input/output processing unit, and input/output operation activation from the central processing unit is performed. Connect the request to that queue. The input/output processing unit then sequentially extracts activation requests from the queue,
Input/output operations were performed by selecting an access path.

[Problem to be solved by the invention]

The above-mentioned input/output processing device is controlled by a microprogram, and in recent years, this microprogram control has become more hierarchical. Under hierarchical microprogram control, the top layer microprogram is in charge of the above-mentioned access path selection process.

By the way, when the top layer microprogram performs access path selection processing, the top layer microprogram checks the status of the bottom layer microprogram at any time to confirm whether the channel is in use. However, as a result, communication between microprograms becomes complicated, making it impossible to take advantage of the benefits of hierarchical microprogram control.

It is possible for the top layer microprogram to perform access path selection processing without recognizing whether a channel is used or not, but in that case, it is necessary to send input/output operation activation request communication to the lower layer microprogram. This results in a waste of time, and the benefits of layered microprogram control cannot be utilized.

An object of the present invention is to solve such problems, and to improve the input/output of an information processing device without complicating communication between microprograms and without generating wasteful startup request communication to lower layer microprograms. The purpose is to provide a startup method.

[Means to solve the problem]

The present invention provides an input/output activation method for an information processing device equipped with an input/output processing device that selects an access path to the input/output device and executes an input/output operation. a first storage device that is accessed by the input/output processing device; and a second storage device that is accessed by the input/output processing device, and a first queue for connecting an input/output operation activation request to the first storage device. group to the second storage device,
A second queue group for connecting input/output operation startup requests is provided, and the input/output processing device extracts the startup request from the second queue group and provides an access path to the input/output device. one or more first channel control units that select and execute an input/output operation; and one or more first channel control units that select an input/output operation by extracting an input/output operation activation request from the central processing unit from the first queue group and executing the input/output operation. Select an access path to the device and select the first access path with that access path.
A second channel controller that selects a channel controller, connects an input/output operation activation request to the second queue group, and notifies the selected first channel controller of the input/output operation activation request.
A channel control unit is provided.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of an information processing device configured based on the input/output startup method of the present invention. In FIG. 6, 1 is a central processing unit, and 2 is a main unit connected to the central processing unit Storage devices 31 and 32 are input/output processing devices connected to the central processing unit 1 and the main storage device 2. And 7.
8 are a first queue group and a second queue group provided in the main storage device 2, respectively. 4 is a second channel control section provided in the input/output processing device 31; 51.
52 is a first channel control section connected to the second channel control section 4. First channel control section 51.
A plurality of channels are connected to 52 , and channel 6 is one of the channels connected to first channel control section 51 .

Next, the operation will be explained using the flowcharts shown in FIGS. 2 and 3. When the central processing unit 1 issues a start request for an input/output operation, it is connected to the first queue group 7 in the main memory 2, and the issue of the start request is notified to the input/output processing unit 31, for example. Be notified. This notification is received by the second channel control unit 4 in the input/output processing device 31, and the second channel control unit 4 extracts the activation request from the first queue group 7 (step 101).
One arbitrary access path for the input/output device specified by the activation request is selected (step 102).

Here, it is checked whether there is an accessible access path for the specified input/output device under the white output processing device 31 (step 103), and if it does not exist, an activation request is again made to the first queue group 7. (step 107), but if there is an accessible access path for the specified input/output device under it, it is recognized under which first channel control unit the selected access path exists. For example, the first channel control unit 51 is selected (Step 104), and a startup request is connected to the second queue group 8 in the main storage device 2 (Step 105). The activation request is notified to (step 106).

Next, the first channel control unit 51 that has received the notification of the activation request extracts the activation request from the second queue group 8 (step 201), and extracts the activation request from the selected queue group 8 under the first channel control unit 51. Select an arbitrary access path from among the access paths that can be accessed to the input/output device (step 202), check whether the selected access path can be used (step 203), and check if the selected access path can be used (step 203). If it is not available, it reconnects to the second queue group 8 (step 205), but if it is available, it performs input/output operations (step 204).

In the information processing device adopting the input/output processing method of the present invention, whether or not a channel is in use is determined by the first channel control unit 5, which is controlled by the lower layer microprogram.
1 (52) and controlled by the top layer microprogram.
There is no need to recognize whether a channel is in use or not, so the top layer microprogram does not need to check the status of the lower layer microprograms (communication between microprograms does not become complicated. There is no need for wasteful activation request communication by the top layer microprogram as in the above.Furthermore, since the load on the top layer microprogram is reduced, the processing performance of the entire input/output processing device 3H32) is improved.

In this embodiment, the number of input/output processing devices and first channel control units are both two, but this is just an example, and the numbers can be set to any number as required.

〔Effect of the invention〕

As described above, the present invention provides an input/output activation method for an information processing device that includes an input/output processing device that selects an access path to an input/output device and executes an input/output operation. The first accessed by the device
a storage device, and a second storage device accessed by the input/output processing device; a first queue group for connecting a request to initiate an input/output operation to the first storage device;
A second queue group for connecting input/output operation activation requests is provided in each of the storage devices, and the input/output processing device is configured to
one or more first channel control units that extract activation requests from a second queue group, select access paths to input/output devices, and execute input/output operations; and input/output operations from the central processing unit. The activation request is extracted from the first queue group, an access path to the input/output device is selected, the first channel control unit having the access path is selected, and the input/output operation is performed on the second queue group. and a second channel control unit that notifies the selected first channel control unit of the input/output operation activation request.

Therefore, in an information processing device adopting the input/output processing method of the present invention, whether or not a channel is in use is checked by the first channel control section controlled by the microprogram in the lower layer, and checked by the microprogram in the uppermost layer. The second channel controller does not need to know whether the channel is in use or not. Therefore, the top layer microprogram does not need to check the status of the lower layer microprograms, and communication between microprograms does not become complicated. In addition, there is no wasteful activation request communication by the top layer microprograms as in the past, and the load on the top layer microprograms is reduced.
The processing performance of the entire input/output processing device is improved.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of an information processing device configured based on the input/output startup method of the present invention, and FIGS. 2 and 3 explain the operation of the information processing device shown in FIG. 1. FIG. 1...Central processing unit 2...Main storage device 4...Second channel control unit 6...Channel 7...First queue group 8 ...Second queue group 31, 32...I/O processing device

Claims (1)

[Claims] (1) In an input/output activation method for an information processing device equipped with an input/output processing device that selects an access path to the input/output device and executes an input/output operation, the information processing device is accessed by the central processing unit and the input/output processing device. a first storage device; and a second storage device accessed by the input/output processing device; a first queue group for connecting an input/output operation activation request to the first storage device; to the second storage device,
A second queue group for connecting activation requests for input/output operations is provided, and the input/output processing device extracts the activation request from the second queue group and provides an access path to the input/output device. one or more first channel control units that select and execute an input/output operation; and one or more first channel control units that select an input/output operation by extracting an input/output operation activation request from the central processing unit from the first queue group and executing the input/output operation. Select an access path to the device and select the first access path with that access path.
A second channel controller that selects a channel controller, connects an input/output operation activation request to the second queue group, and notifies the selected first channel controller of the input/output operation activation request.
An input/output activation method for an information processing device, comprising: a channel control unit.