On Apr 30, 2012, at 6:41 AM, Erik Cederstrand wrote:
>
> Can anyone explain to me why the dynamically linked version is significantly
> slower? What are the extra steps involved compared to a statically linked
> binary?
At the risk of dramatically over-simplifying….
When a static binary is started by the kernel, it does the following:
* Initializes some libc internals.
* Calls main.
When a dynamic binary is started by the kernel, it does the following:
* Initializes some libc internals.
* For every dynamic library referenced by this executable:
- loads the dynamic library into memory
- fixes up references
* Calls main
The process of loading the required libraries and fixing up references
can be quite time-consuming.
Cheers,
Tim
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