<s>
HTCondor	B-Operating_System
is	O
an	O
open-source	B-Application
high-throughput	B-Operating_System
computing	I-Operating_System
software	O
framework	O
for	O
coarse-grained	O
distributed	O
parallelization	O
of	O
computationally	O
intensive	O
tasks	O
.	O
</s>
<s>
It	O
can	O
be	O
used	O
to	O
manage	O
workload	O
on	O
a	O
dedicated	O
cluster	B-Architecture
of	I-Architecture
computers	I-Architecture
,	O
or	O
to	O
farm	O
out	O
work	O
to	O
idle	O
desktop	O
computersso-called	O
cycle	O
scavenging	O
.	O
</s>
<s>
HTCondor	B-Operating_System
runs	O
on	O
Linux	B-Application
,	O
Unix	B-Application
,	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
,	O
FreeBSD	B-Operating_System
,	O
and	O
Microsoft	B-Application
Windows	I-Application
operating	I-Application
systems	I-Application
.	O
</s>
<s>
HTCondor	B-Operating_System
can	O
integrate	O
both	O
dedicated	O
resources	O
(	O
rack-mounted	O
clusters	O
)	O
and	O
non-dedicated	O
desktop	O
machines	O
(	O
cycle	O
scavenging	O
)	O
into	O
one	O
computing	O
environment	O
.	O
</s>
<s>
HTCondor	B-Operating_System
is	O
developed	O
by	O
the	O
HTCondor	B-Operating_System
team	O
at	O
the	O
University	O
of	O
Wisconsin	O
–	O
Madison	O
and	O
is	O
freely	O
available	O
for	O
use	O
.	O
</s>
<s>
HTCondor	B-Operating_System
follows	O
an	O
open-source	B-Application
philosophy	O
and	O
is	O
licensed	O
under	O
the	O
Apache	B-Application
License	I-Application
2.0	O
.	O
</s>
<s>
While	O
HTCondor	B-Operating_System
makes	O
use	O
of	O
unused	O
computing	O
time	O
,	O
leaving	O
computers	O
turned	O
on	O
for	O
use	O
with	O
HTCondor	B-Operating_System
will	O
increase	O
energy	O
consumption	O
and	O
associated	O
costs	O
.	O
</s>
<s>
Starting	O
from	O
version	O
7.1.1	O
,	O
HTCondor	B-Operating_System
can	O
hibernate	O
and	O
wake	O
machines	O
based	O
on	O
user-specified	O
policies	O
,	O
a	O
feature	O
previously	O
available	O
only	O
via	O
third-party	O
software	O
.	O
</s>
<s>
The	O
development	O
of	O
HTCondor	B-Operating_System
started	O
in	O
1988	O
.	O
</s>
<s>
HTCondor	B-Operating_System
was	O
formerly	O
known	O
as	O
Condor	O
;	O
the	O
name	O
was	O
changed	O
in	O
October	O
2012	O
to	O
resolve	O
a	O
trademark	O
lawsuit	O
.	O
</s>
<s>
HTCondor	B-Operating_System
was	O
the	O
scheduler	O
software	O
used	O
to	O
distribute	O
jobs	O
for	O
the	O
first	O
draft	O
assembly	O
of	O
the	O
Human	O
Genome	O
.	O
</s>
<s>
The	O
NASA	B-Device
Advanced	I-Device
Supercomputing	I-Device
facility	I-Device
(	O
NAS	O
)	O
HTCondor	B-Operating_System
pool	O
consists	O
of	O
approximately	O
350	O
SGI	O
and	O
Sun	O
workstations	O
purchased	O
and	O
used	O
for	O
software	O
development	O
,	O
visualization	O
,	O
email	O
,	O
document	O
preparation	O
,	O
and	O
other	O
tasks	O
.	O
</s>
<s>
Each	O
workstation	O
runs	O
a	O
daemon	B-Operating_System
that	O
watches	O
user	O
I/O	B-General_Concept
and	O
CPU	O
load	O
.	O
</s>
<s>
When	O
a	O
workstation	O
has	O
been	O
idle	O
for	O
two	O
hours	O
,	O
a	O
job	O
from	O
the	O
batch	O
queue	O
is	O
assigned	O
to	O
the	O
workstation	O
and	O
will	O
run	O
until	O
the	O
daemon	B-Operating_System
detects	O
a	O
keystroke	O
,	O
mouse	O
motion	O
,	O
or	O
high	O
non-HTCondor	O
CPU	O
usage	O
.	O
</s>
<s>
HTCondor	B-Operating_System
can	O
run	O
both	O
sequential	O
and	O
parallel	O
jobs	O
.	O
</s>
<s>
Sequential	O
jobs	O
can	O
be	O
run	O
in	O
several	O
different	O
"	O
universes	O
"	O
,	O
including	O
"	O
vanilla	O
"	O
which	O
provides	O
the	O
ability	O
to	O
run	O
most	O
"	O
batch	O
ready	O
"	O
programs	O
,	O
and	O
"	O
standard	O
universe	O
"	O
in	O
which	O
the	O
target	O
application	O
is	O
re-linked	O
with	O
the	O
HTCondor	B-Operating_System
I/O	B-General_Concept
library	O
which	O
provides	O
for	O
remote	O
job	O
I/O	B-General_Concept
and	O
job	O
checkpointing	O
.	O
</s>
<s>
HTCondor	B-Operating_System
also	O
provides	O
a	O
"	O
local	O
universe	O
"	O
which	O
allows	O
jobs	O
to	O
run	O
on	O
the	O
"	O
submit	O
host	O
"	O
.	O
</s>
<s>
In	O
the	O
world	O
of	O
parallel	O
jobs	O
,	O
HTCondor	B-Operating_System
supports	O
the	O
standard	O
Message	B-Application
Passing	I-Application
Interface	I-Application
and	O
Parallel	B-Operating_System
Virtual	I-Operating_System
Machine	I-Operating_System
(	O
Goux	O
,	O
et	O
al	O
.	O
</s>
<s>
HTCondor-G	O
allows	O
HTCondor	B-Operating_System
jobs	O
to	O
use	O
resources	O
not	O
under	O
its	O
direct	O
control	O
.	O
</s>
<s>
It	O
is	O
mostly	O
used	O
to	O
talk	O
to	O
grid	B-Architecture
and	O
cloud	B-Architecture
resources	O
,	O
like	O
pre-WS	O
and	O
WS	O
Globus	O
,	O
Nordugrid	B-Operating_System
ARC	I-Operating_System
,	O
UNICORE	B-General_Concept
and	O
Amazon	B-General_Concept
Elastic	I-General_Concept
Compute	I-General_Concept
Cloud	I-General_Concept
.	O
</s>
<s>
But	O
it	O
can	O
also	O
be	O
used	O
to	O
talk	O
to	O
other	O
batch	O
systems	O
,	O
like	O
Torque/PBS	B-Application
and	O
LSF	B-Operating_System
.	O
</s>
<s>
Support	O
for	O
Sun	B-Operating_System
Grid	I-Operating_System
Engine	I-Operating_System
is	O
currently	O
under	O
development	O
as	O
part	O
of	O
the	O
EGEE	O
project	O
.	O
</s>
<s>
HTCondor	B-Operating_System
supports	O
the	O
DRMAA	B-Operating_System
job	O
API	O
.	O
</s>
<s>
This	O
allows	O
DRMAA	B-Operating_System
compliant	O
clients	O
to	O
submit	O
and	O
monitor	O
HTCondor	B-Operating_System
jobs	O
.	O
</s>
<s>
The	O
SAGA	B-Operating_System
C++	I-Operating_System
Reference	I-Operating_System
Implementation	I-Operating_System
provides	O
an	O
HTCondor	B-Operating_System
plug-in	O
(	O
adaptor	O
)	O
,	O
which	O
makes	O
HTCondor	B-Operating_System
job	O
submission	O
and	O
monitoring	O
available	O
via	O
SAGA	B-Operating_System
's	O
Python	O
and	O
C++	O
APIs	O
.	O
</s>
<s>
Other	O
HTCondor	B-Operating_System
features	O
include	O
"	O
DAGMan	O
"	O
which	O
provides	O
a	O
mechanism	O
to	O
describe	O
job	O
dependencies	O
.	O
</s>
