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GESTIONE DELLA MEMORIA
GESTORE MEMORIA :
gestisce assegnazioni e
rilasci della memoria ai
processi.
Come?
1. Non limitare la possibilità di
creare altri processi
2. consentire l’avanzamento dei
processi
3. riderre numero e durata delle
sospensioni
Il gestore occupa
tempo di
processore e causa
overhead
Spazio di memoria viene
diviso in PARTIZIONI
DESCRITTORI DI PARTIZIONE:
-solo per partiz. Libere
-tabella con descr.partiz. libere
-tabella di tutte le partiz.
SCELTA PARTIZIONI:
1. First fit
2. Best fit
PARTIZIONE DELLA MEMORIA:
il processo deve accedere solo
all’area di memoria
assegnatagli senza invadere
altre aree.
SEGMENTAZIONE:
Lo spazio logico del programma è
diviso in segmenti e ognuno è
caricato in una partizione
PAGINAZIONE:
Spazio logico diviso in pagine
della stessa dimensione e
ognuna viene memorizzata in
blocchi di memoria

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Mappa mentale Gestione della memoria

  • 1. GESTIONE DELLA MEMORIA GESTORE MEMORIA : gestisce assegnazioni e rilasci della memoria ai processi. Come? 1. Non limitare la possibilità di creare altri processi 2. consentire l’avanzamento dei processi 3. riderre numero e durata delle sospensioni Il gestore occupa tempo di processore e causa overhead Spazio di memoria viene diviso in PARTIZIONI DESCRITTORI DI PARTIZIONE: -solo per partiz. Libere -tabella con descr.partiz. libere -tabella di tutte le partiz. SCELTA PARTIZIONI: 1. First fit 2. Best fit PARTIZIONE DELLA MEMORIA: il processo deve accedere solo all’area di memoria assegnatagli senza invadere altre aree. SEGMENTAZIONE: Lo spazio logico del programma è diviso in segmenti e ognuno è caricato in una partizione PAGINAZIONE: Spazio logico diviso in pagine della stessa dimensione e ognuna viene memorizzata in blocchi di memoria