Pacing the frequency at which systems of a multisystem environment compress log streams

• US 6,539,389 B1
• Filed: 03/04/1999
• Issued: 03/25/2003
• Est. Priority Date: 03/04/1999
• Status: Expired due to Fees

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Kinder, Stephen Joseph, Geiner, Robert Vaughn, Zobre, Douglas Michael, Greenspan, Steven Jay
• Primary Examiner(s): Alam, Hosain T.
• Assistant Examiner(s): Ly, Anh
• Application Number:
  US09/262,587
• Time in Patent Office: 1,482 Days
• Field of Search: 707/1-10, 707/101, 709/203, 709/216, 709/321, 717/203, 717/207, 717/206
• US Class Current: 1/1
• CPC Class Codes: G06F 11/3495 for systems
• CPC Class Codes: G06F 2201/88 Monitoring involving counting
• CPC Class Codes: Y10S 707/99931 Database or file accessing
• CPC Class Codes: Y10S 707/99938 Concurrency, e.g. lock management in shared database
• CPC Class Codes: Y10S 707/99942 Manipulating data structure, e.g. compression, compaction, compilation

Abstract

The frequency at which a multisystem log stream is compressed by a system of a multisystem environment is adjusted in real-time. The rate at which the multisystem log stream is compressed by the system is ascertained. That rate is relative to how frequently the multisystem log stream is compressed by other systems of the multisystem environment. The frequency with which the system compresses the multisystem log stream is then adjusted in real-time. Thus, the frequency at which one system of the multisystem environment compresses the log stream is relative to the frequency at which other systems of the multisystem environment are compressing the log stream.

Claims

1. A pacing system for pacing the frequency at which multisystem log streams are compressed, said pacing system comprising:

means for ascertaining a rate at which a multisystem log stream is compressed by one system of a multisystem environment, said rate being relative to how frequently said multisystem log stream is compressed by at least one other system of said multisystem environment; and

means for adjusting, in real-time, the frequency at which said one system compresses said multisystem log stream.

2. The pacing system of claim 1, wherein said means for ascertaining comprises checking a compress lag count of said one system, said compress lag count representing the rate at which said one system is compressing said multisystem log stream relative to how frequently said multisystem log stream is compressed by said at least one other system.

3. The pacing system of claim 2, further comprising means for updating said compress lag count when said one system compresses said multisystem log stream.

4. The pacing system of claim 3, further comprising means for setting at least one other compress lag count of said at least one other system, when said one system compresses said multisystem log stream.

5. The pacing system of claim 1, wherein said means for adjusting comprises means for increasing the frequency at which said one system compresses said multisystem log stream, when said ascertained rate indicates that said one system is compressing said multisystem log stream at a slower rate than said at least one other system.

6. The pacing system of claim 5, wherein said means for increasing comprises forcing a compression to be performed by said one system.

7. The pacing system of claim 5, further comprising means for determining, at predefined time intervals, whether said ascertained rate is indicating that the frequency at which said one system compresses is to be increased.

8. The pacing system of claim 7, further comprising means for decreasing the time of said predefined time intervals, when it is determined that the ascertained rate of said one system has a predetermined relationship with a selected value.

9. The pacing system of claim 8, wherein said means for decreasing comprises decreasing by half the time of said predefined time intervals, when it is determined that the ascertained rate is greater than two times (a number of systems coupled to said multisystem log stream minus one).

10. The pacing system of claim 1, further comprising means for comparing, at predefined time intervals, said ascertained rate to a predefined value to determine whether the frequency at which said one system compresses is to be adjusted.

11. The pacing system of claim 10, wherein said adjusting is performed when said ascertained rate has a predefined relationship with said predefined value.

12. The pacing system of claim 10, further comprising means for decreasing the time of said predefined time intervals, when it is determined that the ascertained rate of said one system has a predetermined relationship with a selected value.

13. The pacing system of claim 10, further comprising means for increasing the time of said predefined time intervals, when it is determined that said comparing is to be performed less frequently.

14. The pacing system of claim 1, wherein said multisystem log stream is at least partially located within a coupling facility, said coupling facility being coupled to said one system and said at least one other system of said multisystem environment.

15. A pacing system for pacing the frequency at which multisystem log streams are compressed, said pacing system comprising:

means for ascertaining a rate at which a multisystem log stream is compressed by one system of a multisystem environment, said rate being relative to how frequently said multisystem log stream is compressed by at least one other system of said multisystem environment;

means for comparing, at predefined time intervals, said ascertained rate to a predefined value to determine whether the frequency at which said one system compresses said multisystem log stream is to be adjusted;

means for adjusting, in real-time, the frequency at which said one system compresses said multisystem log stream, when said comparing indicates adjusting;

means for determining whether the time of said predefined time intervals is to be modified; and

means for modifying the time of said predefined time intervals to adjust how often said comparing is performed, when it is determined that the time is to be modified.

16. The pacing system of claim 15, wherein said means for comparing indicates that the frequency of compression by said one system is to be increased.

17. The pacing system of claim 16, wherein said means for determining indicates the time is to be decreased, wherein said comparing is performed more frequently.

18. The pacing system of claim 15, wherein said means for determining indicates the time is to be increased, wherein said comparing is performed less frequently.

19. A pacing system for pacing the frequency at which multisystem log streams are compressed, said pacing system comprising:

a system of a multisystem environment adapted to ascertain a rate at which a multisystem log stream is compressed by said system, said rate being relative to how frequently said multisystem log stream is compressed by at least one other system of said multisystem environment; and

said system being further adapted to adjust, in real-time, the frequency at which said system compresses said multisystem log stream.