A s a c om pl e men t t o da ta d edupli cat ion , de lta c om p ress i on fu r-
t he r r edu c es t h e dat a vo l u m e by c o m pr e ssi n g n o n - dup li c a t e
d ata chunk s r e l a t iv e to t h e i r s i m il a r chunk s (bas e chunk s).
H ow ever, ex is t i n g p o s t - d e dup li c a t i o n d e l t a c o m pr e ssi o n a p-
p ro a ches fo r bac kup s t or ag e e i t h e r su ffe r f ro m t h e l ow s i m -
il a r i t y b e twee n m any de te c ted c hun ks o r m i ss so me po t e n -
t i a l s i m il a r c hunks , o r su ffer f r om l ow (ba ckup and r es t ore )
th r oug hpu t du e t o extr a I/ Os f or r e a d i n g b a se c hun ks o r a dd
a dd i t i on a l s e r v i c e - d i s r up t ive op e r a t i on s to b a ck up s ys t em s.
I n t h i s pa p e r, w e pr opo se L oop D e l t a t o a dd ress the above -
m e n t i on e d prob l e m s by an e nha nced em b e ddi n g d e l t a c o m p -
r e ss i on sc heme i n d e dup li c a t i on i n a non - i n t ru s ive way. T h e
e nha nce d d elt a c o mpr ess ion s che m e co m b in e s f our key t e c h -
ni qu e s : (1) du a l - l o c a li t y - b a s e d s i m il a r i t y t r a c k i n g to d e t ect
po t e n t i a l si m il a r chun k s b y e x p l o i t i n g both l o g i c a l and ph y -
s i c a l l o c a li t y, ( 2 ) l o c a li t y - a wa r e pr e f e t c h i n g to pr efe tc h ba se
c hun ks to a vo i d ex t ra I/ Os fo r r e a d i n g ba s e chun ks on t h e
w r i t e p at h , (3) c a che -aware fil t e r to avo i d ext r a I/Os f or b a se
c hunk s on t he read p at h, a nd (4) i nver sed de l ta co mpressi on t o
perf orm de lt a co mpress i o n fo r d at a chunk s t hat a re o th e r wi se
f o r b i dd e n to s er ve as ba se c hunk s by r ew r i t i n g t e c hn i qu e s
d e s i g n e d t o i m p r ove r es t o re pe rf o rma nc e.
E x p e r i m e n t a l re su lts indi ca te t hat L oop D e l t a i ncr ea se s t he
c o m pr e ss i o n r a t i o by 1 .2410 .97 t i m e s on t op of d e dup li c a -
t i on , wi t hou t no t a b l y a ffe c t i n g th e ba ck up th rou ghpu t, a nd i t
i m p r ove s t he res to re p er fo r m an ce b y 1.23.57 t i m e
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Spectroscopy of A=9 hyperlithium with the (e,e′K+) reaction
- Award ID(s):
- 1913257
- NSF-PAR ID:
- 10244164
- Date Published:
- Journal Name:
- Physical review
- Volume:
- 103
- Issue:
- 4
- ISSN:
- 2470-0010
- Page Range / eLocation ID:
- 1-5
- Format(s):
- Medium: X
- Sponsoring Org:
- National Science Foundation