JPH0644262B2 - Multiprocessor system - Google Patents

Description

The present invention relates to a multiprocessor system.

[Conventional technology]

In load control of conventional multiprocessor system,
As a queuing format, the total reception signal capacity in each processor (central processing unit) has been realized by ensuring the total transmission signal capacity in all the central processing units.

Referring to FIG. 3, in the central processing unit 1a on the transmitting side, when a communication request is issued to the central processing unit 1b on the receiving side, a transaction for transmission in the central processing unit 1a is captured (31), and this transaction for transmission is acquired. Is used to transmit to the receiving side central processing unit 1b (33). Upon receipt of the communication request from the transmission side central processing unit 1a, the reception side central processing unit 1b captures a reception transaction (34), receives communication data (35), and then executes internal processing (36). , End report sending central processing unit 1a
(37) and releases the receiving transaction (38). After transmitting to the receiving side central processing unit 1b, the transmitting side central processing unit 1a waits for an end report from the receiving side central processing unit 1b with the transaction for transmission being held (39), and sends it by the end report reception (40). Release 41 the trusted transaction. As a result, it is not possible to communicate with another central processing unit more than the number of transactions on the transmitting side, and thus load control becomes possible. In the sending side central processing unit 1a, after the sending transaction is captured, when the sending transaction is completely blocked, waiting is performed (42).

[Problems to be Solved by the Invention]

In the above-mentioned conventional system, it is necessary to return the end report from the receiving side central processing unit to the transmitting side central processing unit in order to release the transmitting side transaction, and the number of times of communication always occurs twice with one request. However, the communication capability of the system is inevitable.

[Means for Solving the Problems]

A multiprocessor system of the present invention includes a plurality of processors connected to each other via a communication bus and a common memory shared by the plurality of processors, and sets a congestion state of a plurality of receiving transactions included in each of the plurality of processors. A means for displaying is provided in the common memory, and when communicating between the plurality of processors, the transmitting processor identifies the congestion state of the receiving transaction of the receiving processor based on the means of the common memory and is not in the congestion state. It is a configuration for transmitting.

〔Example〕

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

Referring to FIGS. 1 and 2 showing an embodiment, the multiprocessor system comprises a plurality of central processing units 1a, 1b, 1n interconnected by a communication bus 2. The central processing units 1a to 1n individually provide the common memory 3 with the signal lines 4
It is connected via a, 4b, and 4n. In this configuration, when a communication request occurs in the central processing unit 1a on the transmitting side, the state of the transaction for reception of the central processing unit 1b on the receiving side is read from the common memory 4 (11),
If it is not in the congestion state (12), it is transmitted via the communication bus 2 (13), and the communication processing of the transmission side central processing unit 1a is ended. On the other hand, the receiving side central processing unit 1b captures the receiving transaction (15). After this, the number of remaining receiving transactions is checked (16), and if the number is below the reference value (17), a congestion state is set in the corresponding area of the common memory 3 in order to stop the communication of the subsequent transactions. (18). Next, the communication information is received (19), the internal process is executed (20), and the reception transaction is released at the end of the process (21). Then, in order to restart communication from another central processing unit, after releasing the receiving transaction, the empty number of the remaining receiving transactions is checked again (22), and if it is larger than the reference value (23 ), The congestion display of the common memory 3 is canceled (24). When the identification effect in the transmitting side central processing unit 1a and the receiving transaction are in a congested state, the central processing unit 1a performs waiting (14).

〔The invention's effect〕

As described above, according to the present invention, the communication capability of the system can be improved.

[Brief description of drawings]

1 and 2 are diagrams showing an embodiment of the present invention, and FIG. 3 is a diagram for explaining a conventional operation. 1a, 1b, 1n ... Central processing unit, 2 ... Communication bus,
3 ... Common memory, 4a, 4b, 4n ... Signal line.

Claims (1)

[Claims] 1. A means for displaying a congestion state of a plurality of receiving transactions included in each of the plurality of processors, comprising a plurality of processors connected to each other via a communication bus and a common memory shared by the plurality of processors. Is provided in the common memory, and in communication between the plurality of processors, the transmitting processor identifies the congestion state of the receiving transaction of the receiving processor based on the means of the common memory, and transmits when it is not in the congestion state. A multiprocessor system characterized by.