公开(公告)号：JP2001022464A

公开(公告)日：2001-01-26

申请号：JP18476499

申请日：1999-06-30

Applicant: IBM

Inventor： MATSUTANI YUKA ,  KOMODA NAOYA ,  ITO KAZUMI

IPC: G06F1/30 ,  G06F1/00 ,  G06F1/32 ,  G06F3/06 ,  G06F9/445 ,  G06F12/00 ,  G06F12/16

Abstract: PROBLEM TO BE SOLVED: To optimize compressing and extracting operation at hibernation/wake- up time by determining whether or not memory contents are compressed at next hibernation time and later according to the evaluation of the performance of a system. SOLUTION: On a recording device, an area for hibernation is generated in the form of a file, etc., and the contents of an actual memory are compressed and recorded in the generated area (S2). At this time, the size C reduced by the compression is found from the sizes of the contents of the memory before and after compression (S3). At wake-up time, the time X needed to read the contents of some data of size A out of the generated area on the recording device is measured (S6). Further, the time Y needed to read out the contents of memory size B after the compression of the whole memory and extract them on the actual memory is measured (S7). Then it is decided whether Y-BX/ A