JPH05151033A - Logging control system - Google Patents

Abstract

PURPOSE:To surely and easily retrieve information without the entire information length which is conventionally required for retrieving information due to the missing of part of information by taking a logging unit as the variable length in the logging control system recording the variable length information on a buffer in circulation. CONSTITUTION:By adding discrimination information 1 of the same value through the information to represent the end of 1 byte of each logging information, the discrimination information 1 for each 1 byte to be added to the logging information to be 2-bit codes taken a value 1n different from discrimination information 1n-1 one byte ahead of the leading byte of the logging information and discrimination information 1n+1 one byte later the final byte.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to logging in which a CPU-controlled system records and manages information such as faults that occur in time series on a buffer memory, and in particular, circulates generated variable-length information in a buffer. Relates to a logging control method for dynamically logging. Along with the sophistication and complexity of information in recent years, the obstacles to devices for processing the information have also become more complex. For this reason, it is desired to develop a method capable of obtaining a large amount of various kinds of information as a failure analysis means when a failure occurs and quickly.

[0002]

2. Description of the Related Art Conventionally, in the case of cyclically logging information generated in time series in a buffer, as shown in FIG.
When the unit of 1 logging is information length A, information length B, ─ variable length logging with variable information length and information length D, a part of the oldest information A is the latest information due to circular writing to the buffer. It may be lost due to D, and later, the information search for the oldest information A cannot be performed normally, and the information search becomes difficult. Therefore, as shown in FIG. 4, fixed length logging is generally used in which one logging unit is fixed length N. When the length of the generated information is not constant, the one logging unit is usually the fixed length of the maximum length of the generated information.

[0003]

For this reason, when the length of the generated information is less than one logging unit, there is an empty area in the buffer as shown in FIG. In particular, when the difference between the maximum length and the minimum length of the generated information is large, the useless empty area in the buffer becomes very large. However, if the logging unit is set to a variable length, as mentioned above, some information will be lost, and it will not be possible to search because the entire information length required for information search cannot be obtained. was there. An object of the present invention is to search for information even if some of the information is lost and the entire information length required in the conventional information search cannot be obtained when the generated variable length information is circularly logged in the buffer. Is to realize a logging control method that can be performed reliably and easily.

[0004]

The basic structure of the present invention for achieving this object is shown in FIGS. 1A and 1B of the principle diagram of FIG. In (a) of the figure corresponding to claim 1, in addition to adding the information length 10 of the information to the head of each information to be logged as in the conventional case, the entire information indicating the end of each byte of the logging information Add discrimination information 1 with the same value. Then, the discrimination information 1 for each byte added to certain information to be logged
Is set so as to take a different value 1 _n from the discrimination information 1 _n-1 immediately before the first byte of the information and the discrimination information 1 _{n + 1} immediately after the last byte. Therefore, it is sufficient for the discrimination information 1 to have three values, that is, two bits. Moreover, in order to speed up and simplify information processing by reducing an increase in the amount of information due to the addition of the discrimination information 1 of the means of (a),
As shown in (b), the information to be logged is handled in units of blocks composed of a plurality of bytes, and 2-bit discrimination information 1 is added to each block.

[0005]

In the present invention, in order to express the end of the unit information for each byte of the logging information (Claim 1) or for each block of a plurality of bytes (Claim 2), the same value is used throughout the information. Discrimination information 1 is added. Then, the discrimination information 1 of the certain unit information n is the discrimination information 1 _n-1 immediately before the first byte of the information n and the discrimination information 1 _{n + 1} after the last byte of the information _n.
It is set with a 2-bit code so as to take a value 1 _n different from. Therefore, even when the information length 10 at the beginning of the information is not referred to at the time of information retrieval, the discrimination information 1 of the information is 1 _n-1 to 1 _n.
Or by detecting the change from 1 _n to 1 _{n + 1} , it is possible to judge the end of each byte of each information or each block. Therefore, by cyclically logging information to the buffer with variable length, a part of the logged information is lost, and the information search can be performed reliably even if the entire information length that was conventionally required at the time of information search cannot be obtained. Can be done easily.

[0006]

FIG. 2 is a diagram showing an arrangement of variable-length information in a buffer of a logging control system according to an embodiment of the present invention. (A) of the figure shows the arrangement of the previously logged information. The first information length = 4 is the 2-bit code discrimination information 01, and the next information length = 3 is the 2-bit discrimination information. Is added. 2-bit discrimination information 01 is added to the third information length = 5 information, and 2-bit discrimination information 10 is added to the fourth information length = 4 information. Then, the write pointer is located at the final position of the information of the fourth information length = 4, and the discrimination information 00 is added to the blank portion below. Figure (b)
Indicates the location of the information to be logged this time, and the new information length =
When logging the information of the discrimination information 01 in 4 in the buffer, from the discrimination information 01 of the 2-bit code of the write pointer indicating the first position of the information of the information length = 4, and the discrimination information 10 of the last position logged last time. , A continuous 2-bit code 11 is obtained and used as the discrimination information of the blank portion. Then, from the blank part of the discrimination information 11, logging is started with information length = 12,
Two pieces of information in the latter half of the information length 4 of the discrimination information 01 and the discrimination information
Information of information length 3 of 10, information of information length 5 of discrimination information 01, and information of information length 4 of discrimination information 10 are logged. Therefore, in the embodiment of the present invention, when the information of the logged information is searched for, even if the information length 12 at the head of the logging information is not referred, the discrimination information of the information is from 11 to 01, from 01 to 10 and 10
It is possible to determine the end of each information byte by byte or block by detecting the change points from 01 to 01, 01 to 10, and 10 to 11. Therefore, by circularly logging information to the buffer with variable length, a part of the logged information disappears as a blank part, and even if it is not possible to obtain the entire information length that was conventionally needed when searching for information, The search will be reliable and easy.

[0007]

As described above, according to the present invention, when the information of the logged information is searched, the change point of the discrimination information is detected without referring to the information length added to the head of the information. By doing so, it can be determined that one piece of information has been completed, and therefore, even if there is a variation in the length of each piece of information, it is possible to obtain the effect of reducing the useless area in the buffer.

[Brief description of drawings]

FIG. 1 is a principle diagram showing an arrangement of logging information in a buffer that determines a basic configuration of a logging control system of the present invention.

FIG. 2 is a layout diagram of logging information in a buffer according to the embodiment of this invention.

FIG. 3 is a layout diagram of information in a buffer for variable-length logging of a conventional logging control method.

FIG. 4 is a layout diagram of information in a buffer for fixed-length logging of a conventional logging control method.

[Explanation of symbols]

 1 is the discrimination information, and 10 is the information length of the variable length information.

Claims (2)

[Claims] 1. A logging control method in which variable length information generated in time series is cyclically recorded in a buffer by adding the information length (10) to the head of the information and managing the information. The discrimination information (1) having the same value is added to each information throughout the information representing the end of each byte, and the discrimination information (1) for each byte to be added to certain information is added to the leading byte of the information. Logging which is a 2-bit code having a different value (1 _n ) from the discrimination information (1 _n-1 ) immediately before the last byte and the discrimination information (1 _{n + 1} ) immediately after the last byte. control method. 2. In the above-mentioned logging control method, each piece of information to be logged is treated as a unit of a block consisting of a plurality of bytes, and 2-bit code discrimination information (1) indicating the end of logging information is added to each block. A logging control method characterized by being performed.