<s>
Blackfire	B-Language
Profiler	I-Language
is	O
a	O
tool	O
that	O
instruments	O
PHP	B-Application
applications	O
to	O
gather	O
data	O
about	O
consumed	O
server	O
resources	O
like	O
memory	O
,	O
CPU	O
time	O
,	O
and	O
I/O	O
operations	O
.	O
</s>
<s>
Blackfire	O
is	O
also	O
a	O
SaaS	B-Architecture
service	I-Architecture
to	O
visualize	O
any	O
callgrind-compatible	B-Application
profile	O
.	O
</s>
<s>
Its	O
architecture	O
is	O
based	O
on	O
a	O
Probe	O
,	O
which	O
is	O
a	O
PHP	B-Application
extension	O
that	O
gathers	O
the	O
raw	O
performance	O
profiles	O
and	O
an	O
Agent	O
,	O
which	O
is	O
a	O
server-side	O
daemon	O
that	O
aggregates	O
and	O
forwards	O
profiles	O
to	O
blackfire.io	O
servers	O
to	O
visualize	O
them	O
.	O
</s>
<s>
Blackfire	O
has	O
been	O
used	O
by	O
some	O
popular	O
PHP	B-Application
projects	O
such	O
as	O
ownCloud	B-Language
,	O
Drupal	B-Application
,	O
Symfony	B-Language
and	O
Laravel	B-Language
to	O
improve	O
their	O
performance	O
and	O
to	O
spot	O
performance	O
bottlenecks	O
.	O
</s>
<s>
Compatible	O
with	O
the	O
profiles	O
generated	O
with	O
XHProf	O
,	O
Xdebug	B-Language
and	O
Google	O
Chrome	O
CPU	O
Profiler	O
.	O
</s>
<s>
Automatic	O
aggregation	O
of	O
negligible	O
internal	O
PHP	B-Application
functions	O
.	O
</s>
<s>
Detection	O
of	O
PHP	B-Application
Garbage	O
Collector	O
cycles	O
.	O
</s>
<s>
Application	B-Application
performance	I-Application
management	I-Application
(	O
APM	O
)	O
.	O
</s>
