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Improving Program Start-up with fastbind(1)

Improving Program Start-up with fastbind(1)

The fastbind(1) command prepare an incomplete executable for faster program start-up. It can improve the start-up time of programs that use shared libraries (incomplete executables) by storing information about needed shared library symbols in the executable file.

fastbind performs analysis on the symbols used to bind an executable and all of its dependent shared libraries, and stores this information in the executable file. The next time the executable is run, the dynamic loader (/usr/lib/dld.sl for 32-bit mode or /usr/lib/pa20_64/dld.sl for 64-bit mode) detects that this information is available, and uses it to bind the executable instead of using the standard search method for binding the symbols.

Because fastbind writes the fastbind information in the executable file, you must have write permission on the executable file. If the executable file being analyzed is being run as another process or the file is locked against modifications by the kernel, the fastbind command fails.

If the shared libraries that an executable is dependent on are modified after the fastbind information is created, the dynamic loader silently reverts to standard search method for binding the symbols. The fastbind information can be re–created by running fastbind on the executable again. fastbind automatically erases the old fastbind information and generate the new one.

To do this

Use this

option

 

 

 

Remove the fastbind information from the executable,

-n

returning it to the same state it as was in before you

 

ran fastbind on it.

 

 

 

Normally, if fastbind detects any unsatisfied symbols

-u

while building the fastbind information, it generates an

 

error message and does not modify the executable file.

 

When you invoke fastbind with the -uoption

 

however, it allows unresolved symbols.

 

 

 

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Chapter 4

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Kenwood HP 9000 manual Improving Program Start-up with fastbind1, 118
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