Electrical computers and digital processing systems: memory – Address formation – Address mapping
Reexamination Certificate
2008-01-08
2008-01-08
Bataille, Pierre-Michel (Department: 2186)
Electrical computers and digital processing systems: memory
Address formation
Address mapping
C711S170000, C711S169000, C711S167000, C711S213000
Reexamination Certificate
active
07318142
ABSTRACT:
A system and method for dynamically altering a Virtual Memory Manager (VMM) Sequential-Access Read Ahead settings based upon current system memory conditions is provided. Normal VMM operations are performed using the Sequential-Access Read Ahead values set by the user. When low memory is detected, the system either turns off Sequential-Access Read Ahead operations or decreases the maximum page ahead (maxpgahead) value based upon whether the amount of free space is simply low or has reached a critically low level. The altered VMM Sequential-Access Read Ahead state remains in effect until enough free space is available so that normal VMM Sequential-Access Read Ahead operations can be performed (at which point the altered Sequential-Access Read Ahead values are reset to their original levels).
REFERENCES:
patent: 5606685 (1997-02-01), Frandeen
patent: RE36462 (1999-12-01), Chang et al.
patent: 6327642 (2001-12-01), Lee et al.
patent: 6408313 (2002-06-01), Campbell et al.
patent: 2002/0091895 (2002-07-01), Haines et al.
patent: 2003/0105940 (2003-06-01), Cooksey et al.
patent: 2004/0080512 (2004-04-01), McCormack et al.
patent: 2004/0268124 (2004-12-01), Narayanan
“Evaluating Advanced Time Sharing Systems,” IBM TDB, Oct. 1971, p. 1462-65.
“Redirector Multimedia Streaming Using Asynchronous Read Ahead,” IBM TDB, May 1994, p. 65-68.
“Performance Overview of Management of Fixed Disk Storage,” AIX Ver. 3.2 and 4 Performance Tuning Guide, http:/
scp.upen.edu/aix4.3html/aixbman/prftungd/fdiskman.htm, 5pages.
“Tuning with vmtune,” Performance Management Guide, http://publibn.boulder.ibm.com/doc.sub.—link/enUS/a.sub.—doc.sub.—lib/- aixbman/prftungd/2365c89.htm, 6 pages.
“Performance Overview of the Virtual Memory Manager (VMM),” Performance Management, Guide, http://publibn.boulder.ibm.com/pseries/en.sub.—US/aixbman/prftungd/2365c- 22.htm, 9 pages.
“Virtual Memory Manager (VMM) Overview,” System Management Concepts: Operating System and Devices, http://publib16.boulder.ibm.com/pseries/en.sub.—US/aixbman/admnconc/vmm.- sub.—overview.htm, 2 pages.
Accapadi Jos Manuel
Dunshea Andrew
Hepkin David Alan
Li Li
Neuman Grover Herbert
Bataille Pierre-Michel
Flynn John D.
International Business Machines - Corporation
VanLeeuwen & VanLeeuwen
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