[Python-Dev] Embedded Python startup is slow

[James Y Knight]

On Mar 24, 2011, at 11:58 AM, bruce bushby wrote:
> My main concern was that a freshly compiled Python attempts to open 168 non-existent files before starting. 
> 
> I understand that an interpreted language is probably not the best choice for an embedded device (although it's very nice for prototyping) , Python really should know what exists after it's just been compiled....ie before any corrupting modules or other nonsense has been added.
> 
> It appears it is hard coded to open these files regardless of any "configure" options.
> 
> On my desktop pc, when I run the most simple "Hello World" .... 78% of the overall execution time is spent opening files....most of which don't exist. 
> 
> Some form of "cache" would help the startup time on the "second go" ..... but arguably just a "band aid" covering a deeper problem.

The deeper problem on your Desktop PC being that MS-Windows' file system calls are horrifically expensive for no good reason? :)

James