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\begin_body

\begin_layout Title
OS bypass performance without OS bypass
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\begin_layout Date
Usenix 2010
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Outline
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\begin_layout Section
Currying and process-private system calls
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Standard path
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	filename ospath.eps
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OS overhead known to be primary limit even with very efficient devies
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OS Bypass
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\begin_layout Itemize
Move Os functionality into the library
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As long as you can relink 
\emph on
every
\emph default
 program that uses the network, it's fine
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And single-user
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Pushing IO back into the kernel via currying and process-private system
 calls
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How it is used
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fd = open( 
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/dev/torusctl
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)
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newsyscall = write(fd, 
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fastpath pointer size
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);
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paramters and operation 
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curried
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 into new system all
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newsyscall attached to this process and its children only
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newsyscall(); -- no parameters, fast path
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no parameters and bypasses all system call checking 
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\begin_layout Itemize
700 ns measured time on barrier
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Now any program, not just mpi programs, can use the network
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\begin_layout Itemize
Being integrated into new mpi library now
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