Re: Shared var between processes

On 22.10.2017 18:59, John Dunlap wrote:
> In our case, we do not use Windows for anything. Even our desktops are Linux. We already
> employ Redis, which performs the same function as memcache, however, this doesn't really
> solve the problem because each virtualhost also relies on its own redis database so, even
> in that case, we would still need a per virtualhost configuration mechanism to tell us
> which redis database to use.
>
> At present, I kinda like Ben Rubson's suggestion of a read only hash in a startup script
> which is keyed by hostname

Yes, no doubt about that. But this does not answer the question : where do you store this 
hash (or a reference to it), so that a handler, later, would have access to it ?

startup_script :

my $big_hash = {
	hostname1 => { ... },
	hostname2 => { ... },
	};
# save $big_hash "somewhere"
exit;

... later ...

sub handler {
# how do I access $big_hash ? (where is it ?)

return OK;
}




>
> On Sun, Oct 22, 2017 at 6:29 AM, André Warnier (tomcat) <[email protected]
> <mailto:[email protected]>> wrote:
>
>     On 22.10.2017 09:45, Ben RUBSON wrote:
>
>         On 21 Oct 2017 08:53, André Warnier (tomcat) wrote:
>
>             On 20.10.2017 17:15, Adam Prime wrote:
>
>                 On 17-10-20 05:17 AM, André Warnier (tomcat) wrote:
>
>                     On 20.10.2017 10:50, Ben RUBSON wrote:
>
>                         On 20 Oct 2017 10:38, André Warnier (tomcat) wrote:
>
>                     I believe that there is much more of a performance hit, when asking
>                     the server to set up
>                     an environment ($ENV) for sub-processes, than via the PerlSetVar
>                     mechanism.
>
>
>                 You don't need to use $ENV. If you're using handlers you could use
>                 $r->server()->server_hostname.
>
>                 You could certainly create a big hash at startup and grab stuff out of it
>                 that way, where
>                 the top level key is the hostname.
>
>
>             Assuming that you wanted to do this, where would you put this big hash, so
>             that it is
>             persistent across requests, and can be accessed by mod_perl handlers ?
>
>
>         If it's a read-only hash, then a startup script (PerlPostConfigRequire) as Adam
>         proposed
>         before seems to be the right way.
>
>
>     Yes, but where exactly do you keep that hash, so that it is accessible later on by
>     mod_perl handlers ? (across requests)
>
>
>
>
> --
> John Dunlap
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