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Re: application start up and library load performance


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Are you using RTLD_LAZY or RTLD_NOW with the dlopen call? The differences are not huge, and using RTLD_NOW would cause some level of slowdown.

You might want to try gcc 3.2, also, to see if that makes a difference.

- -Corey

Robert Schweikert wrote:

|Hi,
|
|Sorry if this is the wrong list.
|
|I have a question/concern about application startup and shared library
|load performance. We have a large interactive application that uses a
|lot of shared libraries. The application startup time and the load times
|of the shared libraries on Linux is very bad when compared to W2K. I do
|not have a number for the startup time but as an example here are the
|load times for a couple of libraries.
|
|The times on Linux:
|
|Here are the numbers on Linux
|
|Loading /exec/PartGui.so ...
|Load time: 1.26768 seconds
|Begin dynamic initialization ...
|Dynamic initialization time: 0.219152 seconds
|Loading /exec/Part.so ...
|Load time: 17.993 seconds
|Begin dynamic initialization ...
|Dynamic initialization time: 0.732228 seconds
|Loading /exec/PropertyGui.so ...
|Load time: 1.49174 seconds
|Begin dynamic initialization ...
|Dynamic initialization time: 0.099248 seconds
|Loading /exec/Property.so ...
|Load time: 2.13095 seconds
|Begin dynamic initialization ...
|Dynamic initialization time: 0.653313 seconds
|
|
|Here are the numbers on W2K
|
|Loading d:\exec\PartGui.dll ...
|Load time: 0.515 seconds
|Begin dynamic initialization ...
|Dynamic initialization time: 0.188 seconds
|Loading d:\exec\Part.dll ...
|Load time: 4.234 seconds
|Begin dynamic initialization ...
|Dynamic initialization time: 0.0779999 seconds
|Loading d:\exec\PropertyGui.dll ...
|Load time: 0.422 seconds
|Begin dynamic initialization ...
|Dynamic initialization time: 0.109 seconds
|Loading d:\exec\Property.dll ...
|Load time: 0.25 seconds
|Begin dynamic initialization ...
|Dynamic initialization time: 0.438 seconds
|
|
|These times were collected on PIII !GHz machines with identical I/O
|hardware. Since Linux does everything else faster the W2K I was
|wondering if anyone has any tips on how we can improve on the load times
|on Linux.
|
|We use dlopen call for the shared libraries, the code is compiled with
|the Intel C/C++ compiler.
|
|Any insight/help on this topic is much appreciated.
|
|Thanks,
|Robert
|
|

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