Bottleneck At Heaven's Gates (Part Six)

[August Highland]

Bottleneck At Heaven's Gates (Part Six)


nde r-m eas uri ng
the ms elv es
F00 21
CS /EE
58 10
CS /EE
68 10
Whi ch P
rog ram
s do
you Ch oos e?
eR eal Pr ogr
am s
kC lea rly the rig ht c
hoi ce!
"T oo bad
the re i s a po rtin g p rob lem ...
kP lus the
bu rde n is
on the
us er t o k now
wh ich pr ogr
am s to
ca re
abo ut
eK ern els
kC om put atio
nal ly i nte nse
pie ce of a
rea l pr ogr am
kL ive rm ore
Lo ops
an d L inp ack
are ex am ple s
kN OT rea
l pr ogr am s h ow eve
r!
"N o u ser rea
lly use
s th em , he
nce ca n b e m
isle adi ng
eO the r id eas ?
F00 22
CS /EE
58 10
CS /EE
68 10
Ben chm arks
eT oy Ben
chm ark s
kq uic kso
rt, 8-q
uee
ns, etc
kP ret ty f
eeb
le r eal ly...
"T hat wo
n't sto p u s fr om us ing the
m f or the
lab
s, j ust to ma ke the
m
tra cta
ble ...
eS ynt het ic B
enc hm ark s
kW het sto ne, Dh rys ton es
kT hey try to mim
ic r eal pr ogr
am s
kB ut t hey
do n't do a v ery go od job ... eac
h s uite
ha s it s o wn bia
s
kN o u ser ev er r
eal ly r uns
the m
kT hey are n't eve
n p iec es of r
eal pr ogr
am s
kT hey typ ica lly res ide in cac
he and
do n't tes t m em ory sy ste m
kA t th e v ery lea st, und
ers tan d w
hat it d
oes , an d w hat it t est s!
eA lwa ys Be wa re!
F00 23
CS /EE
58 10
CS /EE
68 10
Ben chm ark Dise
ase
eL ots of sui tes of ben
chm
ark s o ut t her e
kD hry sto ne trie s to
me asu re i nte ger pe rfo rm anc
e
kL oop
s a nd Lin pac
k ta rge t flo
atin g p oin t m atr ix s
tuf f
eW hat ab out co mp ilat ion ? O S? Etc
?
eF or tod
ay' s m
ach ine s, S
PE C i s o
ne ans
we r
kT ry t o s tan dar diz e o n a se t of
rea
l pr ogr am s th
at e xer cis e
diff ere nt a
spe cts of the co mp ute r sy
ste m
SPE C: S yste m P erfo rma nce Eva
luat ion
Coo pera tive
eF irst Ro und
19 89, 10 pr ogr
am s y ield
ing a s
ing le
num ber ("S
PE Cm
ark s")
eS eco nd Ro und
19 92
kS PE CIn
t92 (6 inte
ger pr ogr
am s) a
nd SP EC fp9 2 (1
4 fl oat ing po int
pro gra ms )
"C om pile
r F lag
s u nlim
ited . M arc
h 9 3 o f D EC 40 00 Mo del 61 0:
sp ic e: u ni x. c: /d ef =( sy sv ,h as _b co py ," bc op y( a, b, c) =
me mc py (b ,a ,c )"
wa ve 5: / al i= (a ll ,d co m= na t) /a g= a/ ur =4 /u r= 20 0
na sa 7: / no re cu /a g= a/ ur =4 /u r2 =2 00 /l c= bl as
eT hir d R
oun
d 1 995
kn ew se t of
pr ogr
am s: S
PE Cin
t95 (8 inte
ger pr ogr
am s) a
nd
SP EC fp9 5 (1
0 fl oat ing po int)
k" ben
chm
ark s u sef ul f or 3 y ear s"
kS ing le f lag se ttin
g fo
r al l pr ogr am s: S
PE Cin
t_b ase
95,
SP EC fp_ bas
e95
Pag e 5
F00 25
CS /EE
58 10
CS /EE
68 10
Bew are of R
epo rted Per form
anc e
eC laim
tha t Sp ice tak
es X s eco
nds on ma
chi ne Y
kW hic h s pic e v ers ion ?
kI npu
t? W
hat wa s th
e c ircu
it?
kO per atio
nal pa ram
ete rs? Tim
e s tep ? D ura tion
?
kC om pile
r an d v ers ion ? C om pile
r o ptim
iza tion
se ttin
gs?
kM ach ine co nfig
ura tion
? D isk ? M
em ory ?
eR epr odu
cib ility
is a m
ust
eS ad tha t ca
r m aga
zin es are
be tter



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