JPH02287749A - Input/output actuation system - Google Patents

Abstract

PURPOSE:To eliminate unnecessary access and to reduce the overhead in an input/output processor by referring to a storage means and recognizing an actuation queue where input/output actuation requests having an access path under the control of the input/output processor are present, and extracting an input/output actuation request and starting input/output operation. CONSTITUTION:If an input/output actuation request for input/output devices 104 - 106 is generated, input/output processors 102 and 103 which are informed of that store the connection of the input/output actuation request when the request corresponds to actuation queues in their 1st storage means 108 and 109. Then the input/output processors 102 and 103 refer their 1st storage means 108 and 109 and 2nd storage means 110 and 111 to recognize the actuation queue 107 where the input/output actuation request having the access path under their control is present and extracts the input/output actuation request from the actuation queue 107 to start input/output operation. Consequently, the overhead of the input/output processors 102 and 103 is reduced to eliminate unnecessary access to the actuation queue 107 and prevent the system performance from deteriorating.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an input/output activation method when an input/output processing unit independent of a central processing unit performs input/output activation to an input/output device.

[Conventional technology]

Conventionally, in this type of I/O activation method, multiple I/O processing devices actively access multiple activation queues to which I/O activation requests are connected, and the I/O activation requests are connected to the activation queues. If it is connected, extract one of the input/output activation requests, select one of the multiple access routes to the input/output device, and activate the input/output.
'tlJ was scheduled to be produced.

[Problem to be solved by the invention]

However, in the conventional I/O activation method described above, each I/O processing device actively accesses each activation queue to determine whether an I/O activation request is connected to the activation queue. The startup queue was accessed even when there was no I/O startup request, and the startup queue was accessed even when there were no I/O startup requests in all startup queues. This causes a large overhead in the input/output processing unit, and generally the startup queue is located in a system common area such as the main memory so that it can be accessed by multiple input/output processing units, resulting in unnecessary access. This has the disadvantage of reducing system performance.

The present invention improves these conventional drawbacks, and its purpose is to reduce the overhead in the input/output processing unit, prevent unnecessary access to the startup queue, and prevent deterioration of system performance. The objective is to provide a possible input/output activation method.

[Means to solve the problem]

The input/output activation method of the present invention includes a first storage means for storing information on which activation queue to which an input/output activation request is connected among a plurality of activation queues; A second storage means for storing information as to whether or not an access path used for input/output activation exists under the internal input/output processing device is provided in each input/output processing device, and the input/output processing device is configured to perform input/output activation. At the same time, by referring to the first and second storage means, an activation queue in which an input/output activation request having an access route exists under the internal input/output processing device is recognized;
The input/output activation request is extracted from the activation queue and the input/output activation is performed.

[Effect]

When an input/output activation request for an input/output device is issued, the input/output processing device that received the knowledge connects the input/output activation request to the location corresponding to the activation queue of the first storage means in its own device. remember what happened. Next, the input/output processing device refers to the first storage means and the second storage means in the own device, and recognizes an activation queue in which an input/output activation request having an access route exists under the own device, The input/output activation request is extracted from this activation queue and the input/output activation is performed. When the activation queue is recognized and it is, for example, "0#," the input/output processing device does not access the activation queue.

〔Example〕

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

FIG. 1 is a block diagram of one embodiment of the present invention.

Referring to FIG. 1, a main storage device 101 and input/output processing devices 102 and 103 are connected to the central processing unit 100.
5, and the input/output processing device 103 is the input/output device lO5.

106.

In the main storage device 101, there is generally one activation queue 107 for each logical control unit, which is a group of input/output devices that may use the same access route.

Also, within the input/output processing device 102, a first storage means 10 is provided.
8 and a second storage means 110 are provided.
Similarly, within the input/output processing device 103, storage means 1 of layer 1 is also stored.
09 and a second storage means 111 are provided. The first storage means 108, 109 of these input/output processing devices 102, 103 stores information on which startup queue of the plurality of startup queues 107 each input/output processing device 102, 103 is in.
Information indicating whether an input/output activation request is connected is stored in the second storage devices 110, 111, and the access path used for input/output activation for each activation queue 107 is stored in the second storage device 110, 111. Information as to whether or not it exists under the control is stored.

FIG. 2 shows first storage means 108, 109. It is a diagram showing an example of the configuration of information in the second storage means 110, 111, and if there is an access route under each input/output processing device 102, 103 for each startup queue, that is, for each control unit, 1 If there is no "0", it is set in advance.

Next, in such a configuration, the input/output activation processing procedure will be explained using the flowchart of FIG. 3.

In a system such as that shown in FIG.
Since the access acid paths under 2 and 103 are determined by the system configuration, each input/output processing unit [102,
The second storage means 110 and 111 in 103 store '1' if there is an access route under each input/output processing device for each activation queue, that is, for each logical control unit.
If not, set it to 10” in advance.

Now, when the central processing unit 100 issues an input/output activation request for the input/output device 105, the activation queue group 107
The startup queue (here, startup queue #) corresponding to the logical control unit including the input/output device 105 in
Set to 0. ), the input/output activation request is connected to the central processing unit 100, and the input/output processing unit! 102 and 103 are notified that the input/output activation request has been connected to activation queue #0.

The input/output processing device 102 that received the notification
1" is stored in the location corresponding to the activation queue #0 of the storage means 108, and it is stored that the input/output activation request is connected to the activation queue #0 (Stella: 7" 300, 301).

In addition, the input/output processing device 102 refers to the first storage means 108 and the second storage means 110 in the own device at an appropriate time (step 302), and checks the startup queue that has been recognized to be 1'' in each case (step 302). Step 303 to access the main storage device 101 for (startup queue #0 in this case)
304), an input/output activation request to the input/output device 105 is extracted from activation queue #0, and input/output activation is performed (step 306). Input/output device 105 from startup queue #0
As a result, if the startup queue #0 becomes empty, the first storage means 10 in the own device
8 stores the state where there is no input/output activation request in activation queue #0, that is, 0″' (Stella 7'307, 30
8).

When the input/output processing device 102 accessed the startup queue, the input/output startup request for the input/output device 105 had already been extracted by the input/output processing device f103, and startup queue #0 was already empty. If so, a state in which there is no input/output activation request in activation queue #0, that is, "0" is stored in the first storage means 108 in the own device (steps 305 and 308).

In the input/output processing device 103, similar control is performed on the first storage means 109 within the device itself.

In this way, when "0" is stored in a location corresponding to a startup queue in the first storage means 108, 109, the input/output processing device 102, 103 does not access that startup queue. This makes it possible to prevent unnecessary access to the activation queue existing in the common area.

〔Effect of the invention〕

As explained above, in the present invention, the input/output processing device refers to the first and second storage means at the time of input/output activation, so that an input/output activation request with an access route exists under the internal input/output processing device. Since the activation queue is recognized, the input/output activation request is extracted from the activation queue, and the input/output activation is performed, it is possible to prevent unnecessary access to the activation queue existing in the common area. This has the effect of reducing the overhead within the input processing device and preventing a decrease in system performance.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a diagram showing an example of the configuration of information in the first and second storage means provided in the input/output processing device, and FIG. 3 is the input/output processing device. It is a flowchart which shows a start-up processing procedure. In FIG. 1, 100...Central processing unit, 101...Main storage device,
102.1o3...input/output processing device, 104, 10
&106...I/O device, 107...Startup queue group, 108.109...First storage means, 110,
111...Second storage means. Agent Patent Attorney Johei Yamashita

Claims (1)

[Claims] An input/output activation request issued by the central processing unit is connected to an activation queue, and multiple input/output processing units independent of the central processing unit access the activation queue, take out the input/output activation request, and process the input/output. In an input/output activation method that selects one of multiple access routes to a device and performs input/output activation, information on which activation queue among multiple activation queues an input/output activation request is connected to. and a second storage means that stores information as to whether or not an access route used for input/output activation exists under the own input/output processing device for each activation queue. An input/output activation request is provided in each input/output processing device, and the input/output processing device refers to the first and second storage means at the time of input/output activation, so that an input/output activation request having an access route under the own input/output processing device exists. An input/output activation method characterized by recognizing an activation queue, extracting an input/output activation request from the activation queue, and performing input/output activation.