<s>
The	O
IBM	B-Language
System	I-Language
z	I-Language
Application	I-Language
Assist	I-Language
Processor	I-Language
(	O
zAAP	B-Language
)	O
,	O
previously	O
known	O
as	O
the	O
zSeries	B-Language
Application	I-Language
Assist	I-Language
Processor	I-Language
,	O
is	O
a	O
mainframe	B-Device
processor	O
introduced	O
by	O
IBM	O
in	O
2004	O
.	O
zAAP	B-Language
engines	O
are	O
dedicated	O
to	O
running	O
specific	O
Java	B-Device
and	O
XML	B-Protocol
workloads	O
under	O
z/OS	B-Application
,	O
accelerating	O
performance	O
.	O
</s>
<s>
zAAPs	B-Language
are	O
available	O
for	O
zSeries	O
990	O
and	O
890	O
servers	O
and	O
later	O
zSeries	O
and	O
zEnterprise	O
models	O
.	O
</s>
<s>
Beginning	O
with	O
the	O
IBM	O
z13	O
,	O
the	O
zAAP	B-Language
functionality	O
is	O
integrated	O
with	O
zIIP	B-Device
processors	O
(	O
zAAP	B-Language
on	O
zIIP	B-Device
)	O
.	O
</s>
<s>
Currently	O
a	O
zAAP	B-Language
engine	O
contains	O
the	O
same	O
underlying	O
hardware	O
as	O
any	O
other	O
mainframe	B-Device
engine	O
.	O
</s>
<s>
However	O
,	O
IBM	O
uses	O
microcode	B-Device
to	O
limit	O
code	O
execution	O
to	O
Java	B-Device
and	O
XML	B-Protocol
workloads	O
only	O
.	O
</s>
<s>
As	O
with	O
Integrated	B-Application
Facility	I-Application
for	I-Application
Linux	I-Application
(	O
IFL	O
)	O
and	O
zIIP	B-Device
,	O
zAAPs	B-Language
are	O
not	O
specifically	O
optimized	O
to	O
run	O
Java	B-Device
faster	O
or	O
better	O
.	O
</s>
<s>
IBM	O
does	O
not	O
change	O
the	O
"	O
software	O
model	O
"	O
or	O
MSU	O
rating	O
on	O
its	O
mainframes	O
with	O
the	O
installation	O
of	O
zAAPs	B-Language
.	O
</s>
<s>
Consequently	O
,	O
IBM	O
's	O
customers	O
do	O
not	O
incur	O
software	O
license	O
charges	O
for	O
their	O
zAAPs	B-Language
,	O
reducing	O
their	O
costs	O
of	O
running	O
Java	B-Device
-	O
and	O
XML-oriented	O
applications	O
.	O
</s>
<s>
The	O
number	O
of	O
zAAPs	B-Language
cannot	O
exceed	O
the	O
number	O
of	O
central	O
processors	O
(	O
CPs	O
,	O
general	O
purpose	O
engines	O
)	O
within	O
a	O
zSeries/z9	O
machine	O
.	O
</s>
<s>
IBM	O
made	O
the	O
zAAP	B-Language
feature	O
(	O
i.e.	O
</s>
<s>
the	O
microcode	B-Device
)	O
generally	O
available	O
on	O
June	O
30	O
,	O
2004	O
,	O
although	O
the	O
required	O
z/OS	B-Application
release	O
was	O
not	O
generally	O
available	O
until	O
September	O
24	O
,	O
2004	O
.	O
zAAPs	B-Language
work	O
with	O
z/OS	B-Application
V1R6	O
and	O
higher	O
,	O
and	O
Java	B-Device
1.4.1	O
and	O
higher	O
.	O
</s>
<s>
IBM	O
modified	O
the	O
z/OS	B-Application
dispatcher	O
and	O
Workload	B-Application
Manager	I-Application
(	O
WLM	O
)	O
to	O
switch	O
pure	O
Java	B-Device
workload	O
to	O
the	O
dedicated	O
engines	O
.	O
</s>
<s>
These	O
modifications	O
are	O
completely	O
transparent	O
to	O
Java	B-Device
applications	O
.	O
</s>
<s>
However	O
,	O
because	O
Java	B-Device
must	O
at	O
least	O
occasionally	O
call	O
native	O
system	O
services	O
(	O
I/O	B-General_Concept
services	O
,	O
for	O
example	O
)	O
,	O
some	O
conventional	O
processor	O
(	O
CP	O
)	O
capacity	O
must	O
be	O
available	O
to	O
initiate	O
and	O
sustain	O
a	O
zAAP	B-Language
engine	O
.	O
</s>
<s>
Major	O
software	O
subsystems	O
that	O
could	O
benefit	O
from	O
zAAP	B-Language
(	O
i.e.	O
</s>
<s>
that	O
rely	O
on	O
Java	B-Device
workloads	O
)	O
include	O
WebSphere	B-Language
Application	O
Server	O
,	O
WebSphere	B-Language
Business	O
Integration	O
Server	O
Foundation	O
,	O
WebSphere	B-Language
Process	O
Server	O
,	O
WebSphere	B-Language
Message	O
Broker	O
,	O
Db2	B-Application
,	O
CICS	B-Application
Transaction	I-Application
Server	I-Application
,	O
CICS	B-Application
Transaction	I-Application
Gateway	I-Application
,	O
IMS	B-Application
,	O
and	O
(	O
JZOS	O
and	O
z/OS	B-Application
UNIX	B-Operating_System
System	I-Operating_System
Services	I-Operating_System
)	O
Batch	O
,	O
among	O
others	O
.	O
</s>
<s>
In	O
2007	O
,	O
IBM	O
added	O
zAAP	B-Language
support	O
to	O
the	O
XML	B-Protocol
System	O
Services	O
for	O
z/OS	B-Application
,	O
so	O
now	O
products	O
such	O
as	O
DB2	B-Application
9	O
for	O
z/OS	B-Application
can	O
also	O
take	O
advantage	O
of	O
zAAPs	B-Language
for	O
XML-related	O
processing	O
.	O
</s>
<s>
The	O
first	O
commercial	O
production	O
workload	O
for	O
zAAP	B-Language
began	O
on	O
September	O
1	O
,	O
2004	O
,	O
at	O
an	O
undisclosed	O
Midwestern	O
U.S.	O
insurance	O
company	O
performing	O
claims	O
processing	O
.	O
</s>
<s>
The	O
company	O
used	O
Java	B-Device
1.4.2	O
,	O
WebSphere	B-Language
Application	O
Server	O
Version	O
5.1	O
,	O
and	O
a	O
near-final	O
z/OS	B-Application
V1R6	O
build	O
on	O
a	O
zSeries	O
990	O
(	O
2084-304/A08	O
with	O
two	O
zAAPs	B-Language
)	O
.	O
</s>
<s>
This	O
deployment	O
is	O
probably	O
a	O
mainframe	B-Device
record	O
for	O
speed	O
of	O
both	O
development	O
and	O
adoption	O
,	O
since	O
IBM	O
only	O
began	O
its	O
zAAP	B-Language
design	O
project	O
in	O
2003	O
.	O
</s>
<s>
Third-party	O
independent	B-Application
software	I-Application
vendors	I-Application
(	O
ISVs	O
)	O
have	O
introduced	O
support	O
for	O
execution	O
of	O
their	O
products	O
on	O
zAAP	B-Language
Specialty	O
Engines	O
by	O
using	O
Java	B-Device
or	O
XML	B-Protocol
Services	O
toolkit	O
from	O
IBM	O
.	O
</s>
<s>
For	O
example	O
,	O
Ivory	O
Server	O
for	O
z/OS	B-Application
and	O
Ivory	O
Server	O
for	O
CICS	B-Application
from	O
GT	O
Software	O
,	O
Inc	O
.	O
provide	O
zAAP	B-Language
support	O
for	O
XML	B-Protocol
parsing	O
using	O
the	O
optional	O
IBM	B-Application
z/OS	I-Application
XML	B-Protocol
Services	O
feature	O
.	O
</s>
<s>
The	O
Ivory	O
Server	O
for	O
Java	B-Device
will	O
also	O
take	O
advantage	O
of	O
the	O
zAAP	B-Language
in	O
addition	O
to	O
supporting	O
zIIP	B-Device
and	O
the	O
Integrated	B-Application
Facility	I-Application
for	I-Application
Linux	I-Application
(	O
IFL	O
)	O
.	O
</s>
