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IO_SS(3)							      IO_SS(3)

NAME    [Toc]    [Back]

     io_ss - SpeedShop I/O tracing library

SYNOPSIS    [Toc]    [Back]

     See the prototypes	for the	various	I/O system calls

DESCRIPTION    [Toc]    [Back]

     The SpeedShop Performance Tools contain an	I/O tracing library, -lio_ss,
     which provides tracing for	various	I/O system calls.  The library
     provides intercept	functions for calls to open, creat, read, write,
     close, dup, and pipe.

     The tracing library defines both strong and weak symbols for each of
     these calls, and, at initialization time, uses dlopen and dlsym to	find
     the standard libc addresses for the real functions.  Programs that
     attempt to	provide	their own versions for any of these routines may fail,
     or	may trace incorrectly, or may otherwise	behave unexpectedly, as	one of
     either the	tracing	versions, or the user-supplied versions	will never be

     The library is normally not linked	or invoked directly; the ssrun(1)
     command will use rld to ensure that the library is	in the process'
     address space when	an I/O tracing experiment is run.

SEE ALSO    [Toc]    [Back]

     ssrun(1), prof(1),	ssdump(1), speedshop(1).

DIAGNOSTICS    [Toc]    [Back]

     As	ouput from the library routines.

									PPPPaaaaggggeeee 1111
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prof IRIX analyze SpeedShop performance data
ssrun IRIX set up and run a process to collect SpeedShop performance data
pixdump IRIX print out the tables in SpeedShop instrumented executables
kernprof IRIX special executable for SpeedShop performance measurements on the unix kernel
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