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Re: posix shared memory
On Fri, 29 Mar 2013 15:48:49 +0000
Mindaugas Rasiukevicius <rmind%netbsd.org@localhost> wrote:
> We should go with the userland implementation.
Indeed. Until today I'd never heard of "Posix shared memory". Having
read Takashi's code and the Linux documentation, I have to wonder why
it's not just called "open/close wrappers for use with mmap".
> However, I would say it would be better to create tmpfs partition
> for this.
It is the user's option to mount tmpfs at /var/shm, right?
I would think, though, that tmpfs must impose some overhead relative to
ordinary shared memory i.e. shmget. Another way to gain efficiency
would be to ensure that mmap uses MAP_ANON for descriptors
opened with shm_open.
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