ASCONTEXTforthisbook,computermemoryhierarchyrangesfromcache(fastestandmostexpensive)tomainmemory,tomassstorage(slowestandleastexpensive).Cachememory,immediatelyaccessiblebythecentralprocessingunit,isusuallystaticrandom-accessmemory(SRAM).Mainmemoryisusuallydynamicrandom-accessmemory(DRAM);likeSRAM,itrequirespowertomaintainitsmemorystate,butadditionallymustbeelectricallyrefreshed,typicallyevery64ms(1).Massstorageisexemplifiedbynonvolatileflashmemory(oftheNANDandNORvarieties)andmagnetichard-diskdrives.
2021-11-10 11:17:00
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随机存储器
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