公开(公告)号：JP2004164606A

公开(公告)日：2004-06-10

申请号：JP2003325290

申请日：2003-09-17

Applicant: Internatl Business Mach Corp ,  インターナショナル・ビジネス・マシーンズ・コーポレーションInternational Business Maschines Corporation

Inventor： JOHN T ROBINSON

IPC: G06F12/12 ,  G06F12/02 ,  G06F12/08

CPC classification number: G06F12/0813 ,  G06F12/127

Abstract: PROBLEM TO BE SOLVED: To provide a method and a device for replacing a cache line in a computer system having a set associative cache memory.
SOLUTION: In this method, a ranking guideline is established by means of a writable cache replacement control array 430. This guideline can be dynamically changed when data are written in the cache replacement control array 430. Various cache line conditions are ranked according to the ranking guideline, and if a cache error occurs, the cache line in the highest rank in these ranks is replaced.
COPYRIGHT: (C)2004,JPO

公开(公告)号：JP2000347935A

公开(公告)日：2000-12-15

申请号：JP2000135299

申请日：2000-05-09

Applicant: IBM

Inventor： CAROLINE D BENBENISUTO ,  FRANASZEK PETER A ,  JOHN T ROBINSON ,  CHARLES O SCHULZ

IPC: G06F12/04 ,  G06F12/08 ,  G06F12/10

Abstract: PROBLEM TO BE SOLVED: To shorten excessive memory access duration by storing the set of non-compression segments including a virtual non-compression cache arranging all data segments in a memory at random. SOLUTION: In a compression controller 260, respective segments referred to by a directory index 410 of a FIFO are stored in a non-compression format and the set of all these segments forms the virtual non-compression cache and is managed by an expansion control logic 420. Then, the controller 260 checks the status index of a data segment to be accessed for cache error operation, processes any one of compression data segments from a common memory area according to that status and continuously updates a FIFO 410 and the status index of a directory entry corresponding to the time of processing the non- compression data segments. Thus, the data retrieval duration can be shortened.

公开(公告)号：JP2000227874A

公开(公告)日：2000-08-15

申请号：JP2000000285

申请日：2000-01-05

Applicant: IBM

Inventor： FRANASZEK PETER A ,  JOHN T ROBINSON

IPC: G06F12/04 ,  G06F12/02

Abstract: PROBLEM TO BE SOLVED: To provide a system by which a processor can directly access the contents of the main memory of a compression memory system by formatting entries so that address possibility to the prescribed number of entries is given and permitting second directory structure to make a response to a real memory address. SOLUTION: An address for a directory 220 uses the directory (D2) 410 of a second level, which contains plural directory entries formatted so that address possibility to all the directories 220 is supplied. In a directory 410, a directory entry 412 supplies the address possibility of 64c continuous directory entries 420 corresponding to addresses A1-A64 430 in the directory 220. Thus, the memory of 1024 bytes, which contains the directory entry corresponding to addresses A1-A64 430, can be accessed by using an address A0 414.