Apparatus and method for managing dump data for cause analysis of a memory leak

• US 10,204,000 B2
• Filed: 03/29/2016
• Issued: 02/12/2019
• Est. Priority Date: 05/01/2015
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Takamiya, Masatoshi
• Primary Examiner(s): Schell, Joseph O
• Application Number:
  US15/083,414
• Publication Number:
  US 20160321130A1
• Time in Patent Office: 1,050 Days
• CPC Class Codes: G06F 11/073 in a memory management context, e.g. virtual memory or cache management memory management G06F12/00; testing of static memory units G11C29/00
• CPC Class Codes: G06F 11/0751 Error or fault detection not based on redundancy power supply failures G06F1/30; network fault management H04L41/06
• CPC Class Codes: G06F 11/0778 Dumping, i.e. gathering error/state information after a fault for later diagnosis
• CPC Class Codes: G06F 11/079 Root cause analysis, i.e. error or fault diagnosis in a hardware test environment G06F11/22; in a software test environment G06F11/36
• CPC Class Codes: G06F 12/0253 Garbage collection, i.e. reclamation of unreferenced memory

Abstract

An apparatus includes a memory to store objects of a plurality of classes, and a storage device to store plural pieces of dump data acquired at different times from the memory. The apparatus generates object-count information indicating a number of objects belonging to each of a plurality of classes, based on the plural pieces of dump data acquired at different times from a memory storing objects of the plurality of classes. The apparatus determines, for each class, at least a portion of dump data that includes a locally minimum number of objects in time variation of the number of objects of the each class, as first dump data that is candidate for storage, based on the generated object-count information. When reducing a total amount of dump data, the apparatus excludes the first dump data determined for each class from second dump data that is to be deleted.

Claims

1. A non-transitory, computer-readable recording medium having stored therein a program that causes a computer to execute a process, the process comprising:

generating object-count information indicating a number of objects belonging to each of a plurality of classes, based on plural pieces of dump data acquired at different times from a memory storing objects of the plurality of classes, the plural pieces of dump data being stored in a storage when the plural pieces of dump data are acquired, each piece of dump data being associated with one or more objects and one or more classes;

determining, for each class, at least first dump data from among the plural pieces of dump data, in accordance with the object-count information, the first dump data being associated with a number of objects belonging to each class which, in at least one class, is smaller than numbers of objects belonging to each class associated with second dump data and third dump data, the second dump data being acquired before the first dump data, the third dump data being acquired after the first dump data;

determining deletion candidate data from among the plural pieces of dump data except the first dump data; and

executing a deletion of the deletion candidate data from the storage.

2. The non-transitory, computer-readable recording medium of claim 1, wherein the deletion candidate data is determined from among the plural pieces of dump data except the first dump data and a fourth dump data, the fourth dump data being latest dump data of the plural pieces of dump data.

3. The non-transitory, computer-readable recording medium of claim 1, wherein

a number of objects belonging to a first class associated with the first dump data is smaller than each number of objects belonging to the first class associated with each other dump data acquired after the first dump data, the other dump data being included in the plural pieces of dump data.

4. The non-transitory, computer-readable recording medium of claim 1, wherein the process further includes:

when a total amount of dump data exceeds a threshold value after the deletion, identifying, for each class, fifth dump data in accordance with the object-count information, the fifth dump data being associated with a minimum number of objects belonging to each class; and

determining second deletion candidate data from among the plural pieces of dump data except the fifth dump data and latest dump data; and

executing a deletion of the second deletion candidate data from the storage.

5. The non-transitory, computer-readable recording medium of claim 1, wherein the process further includes:

selecting two or more classes, out of the plurality of classes, in descending order of an increased rate of a number of objects belonging to each class; and

wherein the deletion candidate data is determined from among the plural pieces of dump data except the first dump data associated with the two or more classes.

6. A method for managing dump data for cause analysis of a memory leak, the method comprising:

generating object-count information indicating a number of objects belonging to each of a plurality of classes, based on plural pieces of dump data acquired at different times from a memory storing objects of the plurality of classes, the plural pieces of dump data being stored in a storage when the plural pieces of dump data are acquired, each dump data being associated with one or more objects and one or more classes;

determining, for each class, at least first dump data from among the plural pieces of dump data in accordance with the object-count information, the first dump data being associated with a number of objects belonging to each class smaller than each of numbers of objects belonging to each class associated with second dump data and third dump data, the second dump data being acquired before the first dump data, the third dump data being acquired after the first dump data;

determining deletion candidate data from among the plural pieces of dump data except the first dump data; and

executing a deletion of the deletion candidate data from the storage.

7. An apparatus for managing dump data for cause analysis of a memory leak, the apparatus comprising:

a memory configured to a store objects of a plurality of classes;

a storage device configured to store plural pieces of dump data acquired at different times from the memory, the plural pieces of dump data being stored in the storage device when the plural pieces of dump data are acquired, each dump data being associated with one or more objects and one or more classes; and

a processor coupled to the memory and configured to;

generate object-count information indicating a number of objects belonging to each of a plurality of classes, based on the plural pieces of dump data acquired at different times from the memory configured to store objects of the plurality of classes,

determine, for each class, at least first dump data from among the plural pieces of dump data in accordance with the object-count information, the first dump data being associated with a number of objects belonging to each class smaller than each of numbers of objects belonging to each class associated with second dump data and third dump data, the second dump data being acquired before the first dump data, the third dump data being acquired after the first dump data;

determine deletion candidate data from among the plural pieces of dump data except the first dump data; and

execute a deletion of the deletion candidate data from the storage device.