<s>
HECToR	B-Device
(	O
High	O
End	O
Computing	O
Terascale	O
Resource	O
)	O
was	O
a	O
British	O
academic	O
national	O
supercomputer	B-Architecture
service	O
funded	O
by	O
EPSRC	O
,	O
Natural	O
Environment	O
Research	O
Council	O
(	O
NERC	O
)	O
and	O
BBSRC	O
for	O
the	O
UK	O
academic	O
community	O
.	O
</s>
<s>
The	O
HECToR	B-Device
service	O
was	O
run	O
by	O
partners	O
including	O
EPCC	B-Device
,	O
Science	O
and	O
Technology	O
Facilities	O
Council	O
(	O
STFC	O
)	O
and	O
Numerical	O
Algorithms	O
Group	O
(	O
NAG	O
)	O
.	O
</s>
<s>
The	O
supercomputer	B-Architecture
itself	O
(	O
currently	O
a	O
Cray	B-Device
XE6	I-Device
)	O
was	O
located	O
at	O
the	O
University	O
of	O
Edinburgh	O
in	O
Scotland	O
.	O
</s>
<s>
HECToR	B-Device
's	O
hardware	O
configuration	O
has	O
been	O
progressively	O
upgraded	O
since	O
the	O
system	O
was	O
first	O
commissioned	O
.	O
</s>
<s>
HECToR	B-Device
's	O
initial	O
configuration	O
,	O
known	O
as	O
Phase	O
1	O
,	O
featured	O
60	O
Cray	B-Device
XT4	I-Device
cabinets	O
containing	O
1416	O
compute	O
blades	O
,	O
giving	O
a	O
total	O
of	O
11,328	O
2.8GHz	O
AMD	B-General_Concept
Opteron	I-General_Concept
processor	O
cores	O
,	O
connected	O
to	O
576	O
terabytes	O
of	O
RAID	B-Architecture
backing	O
storage	O
,	O
later	O
increased	O
to	O
934	O
TB	O
.	O
</s>
<s>
In	O
August	O
2008	O
,	O
28	O
Cray	B-Device
X2	I-Device
Black	O
Widow	O
vector	O
compute	O
nodes	O
were	O
added	O
to	O
the	O
system	O
.	O
</s>
<s>
Each	O
node	O
had	O
4	O
vector	B-Operating_System
processors	I-Operating_System
,	O
giving	O
a	O
total	O
of	O
112	O
processors	O
.	O
</s>
<s>
In	O
the	O
summer	O
of	O
2009	O
,	O
the	O
XT4	B-Device
cabinets	O
were	O
upgraded	O
with	O
quad-core	B-Architecture
2.3GHz	O
Opteron	B-General_Concept
processors	O
with	O
8	O
GB	O
memory	O
each	O
.	O
</s>
<s>
The	O
Phase	O
2b	O
upgrade	O
,	O
performed	O
in	O
2010	O
,	O
involved	O
installation	O
of	O
a	O
new	O
20-cabinet	O
Cray	B-Device
XT6	I-Device
system	O
featuring	O
12-core	O
Opteron	B-General_Concept
6100	O
processors	O
,	O
giving	O
a	O
total	O
of	O
44,544	O
cores	O
and	O
a	O
peak	O
performance	O
of	O
over	O
360	O
teraflops	O
.	O
</s>
<s>
At	O
the	O
same	O
time	O
the	O
existing	O
XT4	B-Device
system	O
was	O
reduced	O
to	O
approximately	O
half	O
its	O
original	O
size	O
.	O
</s>
<s>
It	O
involved	O
extending	O
the	O
XT6	O
system	O
to	O
30	O
cabinets	O
containing	O
704	O
compute	O
blades	O
,	O
and	O
upgrading	O
the	O
processors	O
to	O
16-core	O
,	O
2.3GHz	O
Interlagos	O
Opterons	B-General_Concept
,	O
giving	O
a	O
total	O
of	O
90,112	O
cores	O
.	O
</s>
<s>
The	O
operating	B-General_Concept
system	I-General_Concept
was	O
also	O
upgraded	O
to	O
CLE	O
4.0	O
.	O
</s>
<s>
HECToR	B-Device
's	O
operating	B-General_Concept
system	I-General_Concept
is	O
Cray	B-Operating_System
Linux	I-Operating_System
Environment	O
(	O
CLE	O
)	O
,	O
formerly	O
known	O
as	O
UNICOS/lc	B-Operating_System
.	O
</s>
<s>
HECToR	B-Device
supports	O
four	O
compiler	O
suites	O
:	O
</s>
<s>
PGI	B-Application
compilers	I-Application
(	O
v7.1-4	O
)	O
-	O
pgf90	O
,	O
pgf77	O
,	O
pgcc	O
,	O
pgCC	O
.	O
</s>
<s>
GNU	B-Operating_System
compilers	O
(	O
v4.2.3	O
)	O
-	O
gfortran	O
,	O
gcc	O
.	O
</s>
<s>
Compilation	O
for	O
the	O
HECToR	B-Device
backend	O
nodes	O
is	O
facilitated	O
through	O
the	O
Cray	O
compilation	O
scripts	O
:	O
ftn	O
,	O
cc	O
,	O
and	O
CC	O
.	O
</s>
