JPH0512199A - Data transfer system - Google Patents

Abstract

PURPOSE:To reduce the waste of a store area at the data receiving side and at the same time to decrease the data copying frequency in a data transfer state. CONSTITUTION:This size information on the largest length, etc., of the transfer data is given to a module B 21 from a module A 11 defore the transfer of data is started. The module 21 forms an area control part in its own data store memory. When the data are transferred between the processors, the module 11 informs the module 21 of the transfer data size. Thus the module 21 searches a pointer out of the area control part for a data receiving area of the minimum capacity that can store the transferred data based on the informed transfer data size. Then the module 21 returns an answer to the module 11. The module 11 copies the transfer data to the pointer showing a store area of its own store memory in an amount equal to the transfer data size.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transfer system between processors.

[0002]

2. Description of the Related Art Conventionally, a data transfer method between processors is a first method in which transferred data is temporarily stored in a temporary storage area (work area) and then transferred to a storage area for management. This is the second method in which a large number of storage areas each having a maximum length of transfer data are provided as a transfer area or a transfer area, and transfer data is directly transferred to and managed by these storage areas.

[0003]

The first method of the conventional data transfer methods is to temporarily transfer the transfer data to a work area and transfer it to a storage area for managing the transfer data. The larger the size, the longer the transfer time and the lower the performance.
Further, since the second conventional method has many areas of the maximum length size of transfer data, if a large amount of small data is taken in each area, the storage area is wasted and the memory resources cannot be effectively used. There was a drawback.

[0004]

A data transfer system according to the present invention is a data transfer system between processors in a system comprising a plurality of processors each including a module and a data storage memory.
When data transfer to the other processor occurs, the data transfer source module of the first processor notifies the data transfer destination module of the second processor of the size of the transfer data, and the data transfer destination module of the data transfer destination module of the own processor. The pointer of the data receiving area of the minimum capacity sufficient to receive and store the transfer data of the storage memory is notified to the first processor in response, and the data transfer destination module follows the pointer of the data storage memory of its own processor. The transferred data is transferred to the data transfer destination module.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1 is a system block diagram showing an embodiment of the present invention, and FIG. 2 is a flow chart showing an operation flow in FIG.

As shown in FIG. 1, the multiprocessor system of this embodiment comprises a processor 1 and a processor 2 connected to each other. The processor 1 comprises a module A11 and a data storage memory 12, and the processor 2 comprises a module B21.
And a data storage memory 22.

Next, the operation of this embodiment will be described with reference to FIG. First, before starting data transfer from the processor 1 to the processor 2, the module A11 notifies the module B21 of size information N such as the maximum length of transfer data (step 1). The module B21 generates the area management unit CTA in the data storage memory 22 (step 2) and waits for the occurrence of data transfer (step 3). When data transfer from the processor 1 to the processor 2 occurs in this state, the module A11 notifies the module B21 of the transfer data size SZ (step 4). The module B21 searches the area management unit CTA for a pointer PT of a data collection area having a minimum capacity for receiving and storing transfer data from the transfer data size SZ (step 5), and notifies the module A11 of a reply (step 6). ). Module A11 is data storage memory 12
The transfer data M of the size is copied to the pointer PT indicating the storage area of. As a result, the transfer data M is transmitted to the storage area in the data storage memory 22 (step 7).

[0008]

As described above, according to the data transfer method of the present invention, the transfer destination module receives the pointer notified from the transfer destination module, and copies the transfer destination data size from the pointer to transfer. Therefore, it is possible to reduce the waste of the storage area on the data receiving side and to reduce the number of times data is copied during transfer.

[Brief description of drawings]

FIG. 1 is a system block diagram showing an embodiment of the present invention.

FIG. 2 is a flowchart showing a flow of operations in FIG.

[Explanation of symbols]

 1, 2 Processors 11, 21 Modules A, B 12, 22 Data storage memory CTA Area management unit M Transfer data N Storage area information PT pointer SZ Transfer data size

Claims (1)

Claim: What is claimed is: 1. In a data transfer system between processors in a system comprising a plurality of processors each including a module and a data storage memory, data transfer from a first processor to a second processor is performed. When it occurs, the data transfer source module of the first processor notifies the size of transfer data to the data transfer destination module of the second processor, and the data transfer destination module is the transfer data of the data storage memory of its own processor. To the first processor, the data transfer destination module notifies the first processor of a pointer of a data receiving area having a minimum capacity enough to receive and store the data, and the data transfer destination module transfers the data according to the pointer of the data storage memory of the own processor. Data transfer characterized by transfer to the destination module Method.