JPS5994152A - High-speed logging system - Google Patents

Abstract

PURPOSE:To perform the logging processing in a high speed, by providing collectively a program and a buffer for logging in an area corresponding to actual addresses following an NUCLIAS of a virtual storage area. CONSTITUTION:A program area 1b for logging and a logging buffer area 1c are provided collectively just after the NUCLIAS so that they correspond to actual addresses. Consequently, in the state where the program and the buffer area for logging are read into a main storage device 2, the program area 2b and the buffer area 2c for logging are stored collectively just after an NUCLIAS 2a. In this manner, the program area and the buffer area are read into actual addresses in the same unit as an NUCLIAS 1a.

Description

DETAILED DESCRIPTION OF THE INVENTION (a1) Technical Field of the Invention The present invention relates to a logging method in a virtual memory data processing system.

(Background of BL technology) Malfunctions in data processing systems can be caused by hardware alone, such as hardware failure or design error, or if the cause is due to microprogram or software design. There are various cases where programs and software are intricately intertwined.

Generally, when such a failure occurs, it is difficult to find out the cause and it takes a long time. Logging is performed to trace the operational status of the system in order to investigate the cause of such failures and measure performance.

(11.1 Prior Art and Its Problems Conventional logging methods include a constant logging method and a mid-start logging method.The constant logging method always uses a buffer area in the main memory to store the logging program and logging results. This method reduces the efficiency of the system as a whole because logging that is not necessary in normal operation is performed, and the real storage area required for logging remains occupied, so the storage capacity of the main storage device is reduced. lower.

FIG. 1 shows the mid-startup logging method, in which in the virtual storage area 1, in addition to the area NUCLIUS (nucleus) where the virtual address and the real address match, there is a program area 1b for logging, a sofa area 1c for logging, A program and data area 1d for normal data processing are provided. NUCLIUS has a fixed area starting from address 0 of the system, in which programs that serve as an interface between hardware and software and must be made resident are located. 2 is a main storage device, and when executing logging, the contents of the logging program area 1b and buffer area IC in the virtual storage area 1 are stored at the paged address 2b of the main storage device 2;
The data is transferred to 2C and logging is performed.

In this way, the program area 1b and buffer area 1c for logging are contiguous in virtual memory, but the real addresses are discontinuous, so if the pages at the real addresses are different, paging is performed for each page. Since channel commands must be generated, the input/output channel command I. becomes large, input/output error retry processing becomes complicated, and efficiency decreases. In addition, in the case of performance measurement, etc., the measurement results are transferred to the magnetic tape device 3.
However, in such a case, when writing to the magnetic tape device using a channel command, if the measurement results in the buffer area are discontinuous on the real address, the data will be saved to the external medium 3 such as magnetic tape. It takes time to evacuate, and the efficiency of the system as a whole decreases. This poses a serious problem, especially in small systems.

fd+ Purpose of the Invention The present invention solves these problems in the conventional logging method, and provides a method that allows high-speed logging processing without reducing the storage capacity of the main storage device or reducing efficiency. The purpose is to

(e1 Structure of the Invention In order to achieve this object, the present invention provides a data processing device using a virtual address system that has an area (NUCLIUS) where virtual addresses and real addresses match. The logging program and logging buffer area are provided together in the area where the NUC
A method is adopted in which the logging program and buffer area immediately after LIUS are read into the corresponding real address of the main storage device and logging is executed.

ff) Embodiments of the Invention Next, examples will explain how the high-speed logging method according to the present invention is actually implemented. FIGS. 2 and 3 are diagrams showing an embodiment of the high-speed logging method according to the present invention. Whether to adopt the method shown in FIG. 2 or the method shown in FIG. 3 is set at the time of IPL.

In FIG. 2, ■ is a virtual storage area, and 2 is a main storage device. In addition to NUCLItlS, the virtual storage area 1 includes a logging program area 1b and a logging buffer area IC.
It is located all together immediately after ICLIUS. Moreover, like the NUCLIUS area,
It is arranged so as to correspond to the corresponding real address in the main memory. 1d is a program and data area for data processing.

As mentioned above, the logging program area 1b and the logging buffer area 1c are provided together immediately after NUCLItlS so as to correspond to the real address, so the logging program and buffer area are stored in the main memory 2. When loaded into NUCLIUS,
Immediately after 2a, a logging program area 2b and a buffer area 2c are stored together.

In this way, similar to N[1CLtllS, the virtual memory area and real address of the logging program area and buffer area correspond, so the program area and buffer area can also be read into the real address in the same unit as NUCLIUS 1 a. By doing so, a decrease in efficiency due to paging can be prevented and logging can be executed quickly.

Area 2d contains data processing programs and 6- and data are stored.

Whether or not to perform logging as described above is determined by the settings at IPL depending on the operation. In other words, if you specify to perform logging at IPL1, N
When the program that loads the UCLIUS program to the real address and initializes the system is loaded, the program 1b in the virtual storage area and the buffer area I are automatically loaded.
C is read into the real address and logging is performed.

If it is specified that logging will not be performed during IPL, the program 1b and buffer area IC will not be read into the real address and no logging will be performed. That is, as shown in FIG. 3, even if NUCLIUS is read into a real address, the logging program and buffer area are not read and the logging area is not used.

When logging is not performed in this way, the real address area is larger than when logging is performed as shown in Figure 2, and as in the conventional constant logging method, the real address area is occupied and the There is no such thing as inviting.

+g+Effects of the Invention As described above, according to the present invention, the logging program area and buffer area are provided in the virtual storage area by NUCLIUS.
is provided in the same unit immediately after NUCLIUS so that it is read at the real address at the same time as NUCLIUS, and whether or not to perform logging is specified at IPL.

Therefore, by specifying logging in IPL only when logging is required, and not specifying logging when logging is not required, you can minimize the impact of logging on system operation due to power supply, and maximize system efficiency. can be converted into

Even when logging is performed, there is no speed reduction due to paging, and data can only be saved to external media once.
This speeds up the logging operation as it can be done quickly with just one command. Therefore, the present invention is extremely effective for small-sized systems that perform logging relatively frequently.

[Brief explanation of drawings]

Figure 1 is a diagram showing the conventional logging method using mid-start.
FIGS. 2 and 3 are diagrams illustrating a high-speed logging method according to the present invention. In the figure, ■ is a virtual storage area, and 1a is NUCLIIJ
S, 1b is the logging program area, IC is the logging buffer area, 1d is the energized data processing program and data area, 2 is the real address, 2a is the NUCLI [IS] on the real address, 2b is on the real address A logging program area, 2C a logging buffer area on a real address, 2d a data processing program and data area on a real address, and 3 an external medium. Patent applicant Fujitsu Ltd. agent Patent attorney Minoru Aoyagi 9-

Claims (1)

[Claims] Area where virtual address and real address match (NOCLI
In a data processing device using a virtual address system that has a virtual memory area (NUCLI A high-speed logging method characterized in that logging is executed by reading the logging program and buffer area immediately after the NUCLIUS into the corresponding real address of the main storage device.