Bottleneck At Heaven's Gates (Part Five)

Bottleneck At Heaven's Gates (Part Five)


app lica tion (a cal cul ato r)
eO f to day
s m icro pro ces sor s
k9 5% go int o e mb edd
ed app
lica tion s
"S SH 3/4 (H itac
hi): be st s
elli ng RIS
C m
icro pro ces sor
k5 0% of mic
rop roc ess or rev
enu
e s tem
s fr om em
bed ded
sys tem s
eO ften foc use d o n p art icu
lar app
lica tion are a
kM icro con tro ller
s
kD SP s
kM edi a P roc ess ors
kG rap hic s P roc ess ors
kN etw ork an d C
om mu nic atio
n P roc ess ors
F00 15
CS /EE
58 10
CS /EE
68 10
Mea sure men t To ols
eH ard wa re: Co
st, del ay, are
a, p ow er e
stim
atio n
eB enc hm ark s, T
rac es, Mi xes
eS imu
lati on (m any
le vel s)
kI SA , R T, G
ate , C ircu
it
eQ ueu ing Th eor y
eR ule s o f Th
um b
eF und
am ent al " Law
s"/ Pri nci ple s
F00 16
CS /EE
58 10
CS /EE
68 10
Rev iew :
Per form
anc e, C ost, Pow
er
F00 17
CS /EE
58 10
CS /EE
68 10
Met ric 1
: Pe rfor man
ce
*T ime
to run the tas k
-E xec utio n ti me , re spo
nse tim e, l ate ncy
*T ask s p er d
ay, ho ur, we ek, se c, n
s …
-T hro ugh
put , ba ndw
idth
Pla ne
Bo ein g 7 47
Co nco
rde
Sp eed
610 mp h
135 0 m ph
DC to Par is
6.5 ho urs
3 h our s
Pas sen ger s
470 132
Thr oug
hpu t
286 ,70 0
178 ,20 0
In p ass eng er-m
ile/ hou
r
F00 18
CS /EE
58 10
CS /EE
68 10
Mea suri ng P
erfo rma nce
e2 ke y a spe
cts
kE xec utio n ti me
kT hro ugh
put
kM aki ng one
fas ter ma
y s low
the oth er
eC om par ing pe rfo rm anc
e
kp erf orm
anc e = 1/e
xec utio n ti me
kI f X is n ti me s fa
ste r th
an Y
kI mp
rov ed per for ma nce
== > d ecr eas ing XE Q t ime
Exe cut ion tim
e Y
Exe cut ion tim
e X
= N
Pag e 4
F00 19
CS /EE
58 10
CS /EE
68 10
Mea suri ng P
erfo rma nce
Go od ide a, b
ut w
hat do we co unt ?
eS eve ral kin ds of "
tim e"
kS top wa tch
tim
e - it's wh
at t he use
r ca res ab out , bu
t is
dep end ent on
"L oad , I/O de lay s, O
S o ver hea
d
kC PU tim
e - tim e s pen
t co mp utin
g y our
pro
gra m
"F act ors ou t tim
e s pen
t w aiti ng for I/O
de lay s
"B ut, inc lud es the OS
+ y our pr ogr
am
kH enc e s yst em CP
U t ime
an d u ser CP
U t ime
F00 20
CS /EE
58 10
CS /EE
68 10
OS Tim e
eU nix "ti me " c om
ma nd rep ort s
ku ser CP
U t ime
ks yst em CP
U t ime
kt ota
l el aps
ed tim e
k% of ela pse
d ti me tha
t is us er +
sy ste m C
PU tim
e
"T ells ho w m
uch tim e y ou spe
nt w
aiti ng
eB ew are !
kO S's ha ve a w
ay of u


august highland

muse apprentice guild
–"expanding the canon into the 21st century"
www.muse-apprentice-guild.com

culture animal
–"following in the footsteps of tradition"
www.cultureanimal.com















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