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WIESS 2000 Abstract
Stub-Code Performance is Becoming Important
Andreas Haeberlen and Jochen Liedtke, Karlsruhe University; Yoonho Park, IBM
Watson; Lars Reuther, Dresden University; and Volkmar Uhlig,
Karslruhe University
Abstract
As IPC mechanisms become faster, stub-code efficiency
becomes a performance issue for local client/server
RPCs and inter-component communication. Inefficient
and unnecessary complex marshalling code can almost
double communication costs. We have developed an
experimental new IDL compiler that produces near-optimal
stub code for gcc and the L4 microkernel. The
current experimental IDL4 compiler cooperates with the
gcc compiler and its x86 code generator. Other compilers
or target machines would require different optimizations.
In most cases, the generated stub code is approximately
3 times faster (and shorter) than the code
generated by a commonly used portable IDL compiler.
Benchmarks have shown that efficient stubs can increase
application performance by more than 10 percent. The
results are applied within IBM’s SawMill project that
aims at technology for constructing multi-server operating
systems.
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