Bottleneck At Heaven's Gates (Part Seven)

Bottleneck At Heaven's Gates (Part Seven)




tes t re por ter s
tha n c om put er m
aga zin es?
*si gh*
F00 26
CS /EE
58 10
CS /EE
68 10
Oth er P
rob lem s
eL et's
as sum
e th at y ou can
ge t th e te
st j ig s
pec ifie d
pro per ly
eW hic h is
be tter
?
eB y h ow mu
ch?
eA re t he pro
gra ms eq ual ly i mp ort ant
?
Ma chi ne A
Ma chi ne B
Ma chi ne
C
Pro g 1 (s ec)
1 10 20
Pro g 2 (s ec)
100 0
100
20
To tal Tim
e ( sec
)
100 1
110
40
F00 27
CS /EE
58 10
CS /EE
68 10
How to S umm
ariz e Pe
rfor man
ce
eA rith me tic me an (we
igh ted ari thm
etic me an)
tra cks
ex ecu
tion tim e: Sigma (T
i)/n
or Sigma (W
i*T i)
eH arm
oni c m
ean (w eig hte d h arm
oni c m
ean ) of
rat es (e.g
., M FLO
PS ) tr ack
s e xec
utio
n ti me :
n/ Sigma (1/R
i) o r n /Sigma (W
i/R i)
eN orm
aliz ed exe
cut ion tim
e is ha ndy
for sc alin
g
per for ma nce
(e. g., X t ime
s fa ste r th
an
SP AR Cs tati
on 10)
kA rith me tic me an imp
act ed by cho
ice of ref ere
nce
ma chi ne
eU se the ge om etr ic m
ean for co mp aris
on:
O~(T
i)^1 /n
kI nde
pen den t of ch ose
n m ach ine
kb ut n
ot g ood me tric for tot al e xec utio
n ti me
F00 28
CS /EE
58 10
CS /EE
68 10
Per form
anc e Ev
alua tion
e" For
be tter
or wo
rse , be
nch ma rks sh ape
a f ield
"
eG ood pro duc ts c rea ted wh
en hav
e:
kG ood be nch
ma rks
kG ood wa ys to s
um ma rize
pe rfo rm anc
e
eG ive n s ale s is
a f unc
tion in par t of pe rfo rm anc
e
rela tive to com
pet itio n, i nve
stm ent in imp
rov ing
pro duc
t as rep ort ed by per for ma nce
su mm
ary
eIf be nch
ma rks /su mm
ary ina
deq uat e, t hen
ch oos
e
bet we en imp
rov ing pro
duc t fo r re al p rog ram
s v s.
imp rov ing pr odu
ct t o g et m
ore sa les ;
Sal es alm
ost alw
ays wi ns!
eE xec utio n ti me is the
me
asu re o f co mp ute r
per for ma nce
!
F00 29
CS /EE
58 10
CS /EE
68 10
Mak e th e Co
mm on C
ase Fas
t!
Mo st p
erv asi ve prin
cip le i n d esi gn
eE asy to say
, ha rd to d
o?
kN eed to val ida te t hat it i s c om mo n o r un
com mo n
kH W = fas t, S W =
slo w
kH W t hat isn
't u sed
sti ll c ost s y ou
kS W d
one rig ht t hat isn
't u sed
pro bab ly d oes n't cos
t yo u
eIt s o ften
the ca se tha t
kc om mo n c ase
s a re s
imp ler tha n u nco
mm on one
s
"e .g. exc
ept ion s, o
ver flow
, in ter rup
ts, etc .
kT rul y s imp
le i s o ften
bo th c
hea p a nd fas t, b est of bot h w orl ds


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