JPH09171500A - Pointer address converter of interprocessor data sharing control table - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the data block control between plural processors by making a device have a constitution that the pool area that each processor locally has is shared via an external sharing storage part. SOLUTION: Each processor secures memories 21, 21 for pool area and initializes a control block 23, a data block 24 and a pool control table 22. For the control processing part 30 of an external sharing storage part, the definition information on a pool area is notified and the securing of a pool area 2 is requested. In the address conversion processing part 31 within the control part of sharing storage device, the control of an address conversion object location is performed based on the control block length imparted as definition information and pointer positional information. When an interprocessor data sharing processing is further performed, each processor performs the exclusive control specific to the pool area by the unit of a reference/update processing. Therefore, not only a data block but also a control block can be shared by a CPU 10 and a CPU 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for sharing data between processors. In particular, a program having a control block for managing each data in an area for storing a plurality of data using an algorithm such as LRU is an effective method for sharing data between processors.

According to the present invention, a pool management table for storing a block length, a number of blocks, a control block length, and a pointer position within a control block, a control block and a data block are arranged in an external shared memory between processors, and each processor is provided with a pool management table. Providing a mechanism for relatively converting the contents of the pointer portion in correspondence with the pool area address in main memory when accessing the pool area (pool management table, control block, data block area) in main memory This enables data sharing between processors based on a data block management algorithm such as LRU.

[0003]

2. Description of the Related Art Conventionally, in a data sharing process having a pool area used for sharing jobs between processors, when trying to realize data sharing between processors, only a data block is arranged and updated in an external shared storage section. During processing, the data block in the external shared storage unit is updated, and other processors are notified that the data block has become the latest.

At this time, if the same data block exists in the pool area inside the processor, the other processor must invalidate the control block corresponding to the data block or acquire the latest data block in the external shared storage unit. In the reference process, if there is no notification that the data in the external shared storage is the latest, the corresponding data block in the pool area inside the processor can be used as it is, but if it is not in the pool area inside the processor, external sharing is possible. The storage unit and the disk are searched in order to acquire the data.

[0005]

SUMMARY OF THE INVENTION In the prior art,
There were the following problems.

Although a data block management algorithm such as LRU is carried out in each processor, data block management between a plurality of processors is not carried out.

For this reason, a data block for which an update request has not been issued is likely to be evicted from the external shared storage unit even if it is frequently used.

[0008]

According to the present invention, in order to allow a data block management algorithm to be executed among a plurality of processors, a pool area which each processor has locally is shared via an external shared storage unit. To do. But,
For this purpose, there is a problem that the addresses on the main memory where the pool areas of the processors are located do not match.

Therefore, the processor is characterized in that the entire pool area is shared by the processors by converting the address of the pointer section in the pool area shared by each processor between the main memory and the external shared memory section.

The pool area comprises a data block, a control block for managing the data block, and a pool management table having the number of data blocks, the data block length, the control block length, and pointer position information in the control block. And is arranged on the external shared storage unit. On the external shared storage unit, the pointer portion in the control block is arranged after being converted into a relative address with the head of the pool area as 0. When each processor references / updates the pool area on the main memory, the updated part of the pool area is converted from the external shared memory to the main memory by converting the address of the pointer part to perform the data retrieval processing and the data management algorithm. Based on this, the pointer in the control block is updated. The contents changed by updating the pointer are converted into the address of the pointer part and reflected in the external shared storage part.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a system configuration diagram in memory sharing between processors. FIG. 2 is a diagram showing an example of the internal structure in the pool area. In FIG. 2, the pointer address part existing in the control table becomes a relative address in the pool area on the external shared storage part, and becomes a memory address on the main memory on each processor. The control block in FIG. 2 has a fixed length and must be adjacent to the pool management table area. The pointer position information area PI in the pool management table is an area for managing the pointer position in the control block, and is capable of managing a plurality of pointers. The logical start / end pointers of the control block group are not subject to address conversion, but the logical start / end pointer storage area is created in the same table format as the control block, or remembered by relative pointers, etc. Can be dealt with.

Each processor has a memory 21 for pool area,
21 are secured, and the control block 23 and the data block 24
In addition, the pool management table 22 is initialized. Also,
The control processing unit 30 of the external shared storage unit is notified of the definition information of the pool area and requests the pool area 21 to be reserved. In the address translation processing unit 31 in the control unit of the external shared storage device, the control block length C given as the definition information is given.
The address translation target position is managed based on L and pointer position information PI to PI.

When performing data sharing processing between processors,
Each processor performs exclusive control unique to the pool area in units of reference / update processing.

When the CPU 10 updates the control table 23 and the data block 24 in the pool area 21 on the memory, the control processing section 30 of the external shared storage section converts the address of the pointer section PN for the updated section of the pool area. After that, it is reflected in the pool area of the external shared storage unit.

When the CPU 10 refers to the pool area 21 on the memory, if it is the part updated by the CPU 10, the control processing unit 30 of the external shared storage unit will be in the pool area of the CPU 10 from the pool area 21 in the external shared storage unit. Then, the address of the pointer portion PN is converted and then copied.

When the CPU 10 refers to the pool area 21 on the memory, if it has not been updated by the CPU 10, the data is not retrieved from the external shared storage unit 20 and the data retrieval processing is performed as it is.

As described above, the CPU 10 and the CPU 1
With 0, not only the data block but also the control block can be shared, and the data block can be managed between the processors by the data block management algorithm.

[0018]

As described above, the present invention replaces the method of sharing a part of the data of a data set as a reuse buffer in the pool area between jobs in the processor so far with the data sharing between the processors and managing the data. The algorithm can be used as it is.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram in memory sharing between processors.

FIG. 2 is a diagram showing an internal structure in a pool area.

[Explanation of symbols]

10, 10 ... CPU, 20 ... External shared storage unit, 21 ... Pool area in external shared storage unit 21,
21 ... Pool area in CPU, 22 ... Pool management table, 23 ... Control block, 24 ... Data block, BL ... Block length of data block,
N ... number of control blocks, CL ... block length of control block, M ... number of pointer areas existing in control block, PI ... PI ... position of pointer area existing in control block, PN ... existing in control block Pointer area (M number exists in one control block).

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshiaki Shinmura 5030 Totsuka-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Hitachi Ltd. Software Development Division

Claims (1)

[Claims] 1. In a system including a plurality of processors and an external shared storage unit shared by these processors via paths, data secured on a main memory and a control block (hereinafter referred to as a pool area) A control block pointer address conversion device that enables sharing (description) between processors via an external shared storage unit.