The future of "frozen" types as the number of CPU cores increases

John Nagle nagle at animats.com
Sun Feb 21 03:58:42 CET 2010


sjdevnull at yahoo.com wrote:
> On Feb 18, 2:58 pm, John Nagle <na... at animats.com> wrote:
>>     Multiple processes are not the answer.  That means loading multiple
>> copies of the same code into different areas of memory.  The cache
>> miss rate goes up accordingly.
> 
> A decent OS will use copy-on-write with forked processes, which should
> carry through to the cache for the code.

    That doesn't help much if you're using the subprocess module.  The
C code of the interpreter is shared, but all the code generated from
Python is not.

    This will get even worse when Unladen Swallow starts generating vast
swaths of unshared x86 instructions.

				John Nagle



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