Minimum TAO

We have added support for the new minimumCORBA specification to TAO. The minimumCORBA specification removes the following features from the CORBA 2.2 specification.

To minimize the footprint of TAO, we first configure ACE to support only those components that are required by TAO. Secondly, we configure TAO to only support the components specified by the minimumCORBA specification. The following two tables show the footprint reduction achieved. Note that the IDL Compiler column refers to the code required to collaborate between the IDL compiler and the ORB, and not to the code for the IDL compiler itself.


Note: All measurement are for ACE 5.0 and TAO 1.0 using egcs-2.91.60 on SunOS5.7

The make flags options used were:

debug=0 optimize=1 static_libs_only=1 DEFFLAGS=-DACE_USE_RCSID=0

These options translate into:

To build a TAO static library, if shared libraries are the default, use make static_libs_only=1 (make sure to do this for ACE, as well). If you're using recent versions of GNU GCC, you can use the -frepo option, which typically reduces the footprint by another 25 percent.


Configuration Component Total OS Utils Logging Threads Demux Connection Sockets IPC Svcconf Streams Memory Token Other
ACE (all components) Size, bytes 709.5 11.9 115.3 13.7 63.0 88.0 68.6 16.9 43.0 99.8 21.4 29.2 76.0 62.9
Percentage of
total size
100 1.7 16.2 1.9 8.9 12.4 9.7 2.4 6.0 14.1 3.0 4.1 10.7 8.9
ACE (TAO components) Size, bytes 570.7 11.9 115.3 13.7 63.0 88.0 68.6 16.9 43.0 99.8 21.4 29.2 0 0
Percentage of
total size
100 2.1 20.2 2.4 11.0 15.4 12.0 3.0 7.5 17.5 3.7 5.1 0 0
Reduction % 19.6 0 0 0 0 0 0 0 0 0 0 0 100 100


Configuration Component Total POA Pluggable Protocols Default Resources Interpretive Marshaling IDL Compiler ORB Core Dynamic Any
Complete TAO Size, Kbytes 1617.2 412.5 281.0 32.1 73.4 10.7 595.2 212.3
Percentage of
total size
100 25.5 17.4 2.0 4.5 0.7 36.8 13.1
Minimum TAO Size, Kbytes 1359.2 376.2 281.0 32.1 73.4 10.7 585.5 0.0
Percentage of
total size
100 27.7 20.7 2.4 5.4 0.8 43.1 0.0
Reduction % 16.0 8.8 0 0 0 0 1.6 100