> On 22 Jun 2020, at 08:15, Inada Naoki <songofaca...@gmail.com> wrote:
>
> On Mon, Jun 22, 2020 at 12:00 AM Guido van Rossum <gu...@python.org> wrote:
>>
>>
>> I believe this was what Greg Stein's idea here was about. (As well as
>> Jonathan Fine's in this thread?) But the current use of code objects makes
>> this hard. Perhaps the code objects could have a memoryview object to hold
>> the bytecode instead of a bytes object.
>>
>
> memoryview is heavy object. Using memoryview instead of bytes object
> will increase memory usage.
> I think lightweight bytes-like object is better. My rough idea is:
>
> * New code and pyc format
> * pyc has "rodata" segment
> * It can be copied into single memory block, or can be mmapped.
> * co_code should be aligned at least 2 bytes.
Would higher alignment help? malloc is use 8 or 16 byte alignment isn't it?
Would that better load the code into cache lines?
> * code.co_code can point to memory block in "rodata".
> * docstring, signature, and lnotab can be lazy load from "rodata".
> * signature is serialized in JSON like format.
> * Allow multiple modules in single file
> * Reduce fileno when using mmap
> * Merge more constants
> * New Python object: PyROData.
> * It is like read-only bytearray.
> * But body may be mmap-ped, instead of malloc-ed
> * code objects owns reference of PyROData.
> * When PyROData is deallocated, it munmap or free "rodata" segment.
>
> Regards,
> --
> Inada Naoki <songofaca...@gmail.com>
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