The fastbind
tool improves the start-up time of programs that use shared libraries.
When fastbind
is invoked, it caches relocation information
inside the executable file. The next time the executable file runs,
the dynamic loader uses this cached information to bind the executable
instead of searching for symbols.
The syntax for fastbind is:
fastbind [-n] [-u] incomplete executable...
where:
- -n
Removes fastbind
data from the executable.
- -u
Performs fastbind
even when unresolved symbols are found. (By default, fastbind stops
when it cannot resolve symbols.)
Using fastbind |
 |
You can create and delete fastbind
information for an executable file after it has been linked with
shared libraries. You can invoke fastbind
from the linker or use the fastbind
tool directly. You can set the _HP_DLDOPTS
environment variable to find out if fastbind
information is out-of-date and to turn off fastbind
at run time.
Invoking the fastbind Tool |
|
To invoke fastbind
on an incomplete executable file, verify
that your executable has write access (because fastbind writes to
the file) and then run fastbind.
$ ls -l main
-rwxrwxrwx 1 janet 191 28722 Feb 20 09:11 main
$ fastbind main |
The fastbind
tool generates fastbind
information for main
and rewrites main
to contain this information.
Invoking fastbind from the Linker |
|
To invoke fastbind from ld,
pass the request to the linker from your compiler by using the -Wl,+fb
options. For example:
$ ld -b convert.o volume.o -o libunits.sl Build the shared library. $ cc -Aa -Wl,+fb main.c -o main \ Link main to the shared
libunits.sl -lc library. Perform fastbind.
|
The linker performs fastbind
after it creates the executable file.
How to Tell if fastbind Information is Current |
|
By default, when the dynamic loader finds that fastbind
information is out-of-date, it silently reverts back to the standard
method for binding symbols. To find out if an executable file has
out-of-date fastbind information, set the _HP_DLDOPTS
environment variable as follows:
$ export _HP_DLDOPTS=-fbverbose
$ main
/usr/lib/dld.sl: Fastbind data is out of date |
The dynamic loader provides a warning when the fastbind
information is out-of-date.
Removing fastbind Information from a File |
|
To remove fastbind
information from a file, use the fastbind
tool with the -n
option. For example:
$ fastbind -n main Remove fastbind information from main. |
Turning off fastbind at Run Time |
|
To use the standard search method for binding symbols, instead
of the fastbind
information in an executable file, set the _HP_DLDOPTS
environment variable as follows:
export _HP_DLDOPTS=-nofastbind Turns off fastbind at run time. |
For More Information: |
|
See the fastbind(1) man page.
Printable version
