Re: [APC-DEV] Ideas for APC 3.0.15/16

Hey Gopal,

I'm currently working on a binary dump that will dump the entire user  
cache and file cache (with filter options as well) into a binary file  
which can then be reloaded into APC.  I have a nearly working copy  
that's still a little buggy, so I'm re-factoring the code and should  
be done fairly soon.  This should give you the ability to do your  
second option, and possibly the first idea as well.  One limitation  
of this is that it is binary, so it is not compatible between  
different architectures ie: endianess/64-32-bit.

The PHP API is currently:

string data apc_bindump(array file_filter, array user_filter);
string data apc_bindump_file(string file, array file_filter, array  
user_filter);
int apc_binload(string data);
int apc_binload_file(string file);

The *_file can also except url's etc.  I believe I also added a way  
to pass in a file descriptor as well.  Let me know if you have any  
suggestions, perhaps a better name than "bindump" is in order but I  
just haven't though up anything better yet.


The JSON mode for apc.php would be useful.  I currently use a much  
simpler version to grab statistics from the apc_cache_info with the  
limited flag set. Something built in to apc.php would be useful for a  
number of things, possibly including getting stats from users  
reporting bugs.


Some additional ideas I have or have partial code for:

Least recently used algorithm for cleaning up the cache.
Multiple memory segment support, which would allow you to create two  
segments with different configurations.


Do you have plans to rework some of the memory management?

-shire

On Jun 19, 2007, at 10:37 PM, Gopal V wrote:

> Hi,
>
> I'm sort of playing around with a lot of ideas for apc 3.0.15,
> to be planned out slowly now and done in the 1st week of Jul.
>
> First up, how about a persistant APC user cache ? Something which
> dumps everything without a TTL into a serialized data dump
> on MSHUTDOWN and re-loads it in MINIT.
>
> Second, a way to compile a large number of files and throw them
> into cache in one go. sort of like apc_compile(), but in batch
> mode, without inserting them as and when they are compiled ?
> This in combination with the nostat mode should make it relatively
> easy to avoid cache slams.
>
> And then a trivial mod - have a JSON mode for apc.php and a
> quick cache health monitoring cron script. Basically checks
> for fragments, cache insert rate, expunge count.
>
> Just sort of a heads-up, so if anybody has any suggestions or
> caveats (especially about #2), shoot :)
>
> Cheers,
> Gopal
> -- 
> The difference between insanity and genius is measured by success
>
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