Shared cache with IPC::Shareable

[Mark Maunder <ma...@swiftcamel.com>]

Hi all,

I'm sharing memory between httpd processes using IPC::Shareable. It is working
but seems to behave inconsistently (memory is often not being freed etc..). I'm
using it for creating common cached areas for file and database contents shared
between httpd children. Is there a better way to do this i.e. Am I stuck with
IPC::Shareable? I'm running mod_perl and the whole application is running as a
single content handler.

It also isn't as fast as I thought it would be  - sure it takes a long time to
do the initial load of all caches on the first request, but I just thought it
would be a little faster than it is. Are there any performance issues I should
be aware of with IPC::Shareable or shared mem in general?

Thanks!

~mark

Re: Shared cache with IPC::Shareable

[Olivier Poitrey <ol...@pas-tres.net>]

You should try Apache::Cache, it's under developpement but seem to be
stable.

For a real documentation look at the CVS version, the actual release is
poorelly
documented.

http://www.rhapsodyk.net/cgi-bin/cvsweb/Apache-Cache/

--
___________________________________________________________________________
 O  l  i  v  i  e  r    P  o  i  t  r  e  y

USA disaster support http://www.osdn.com/911.shtml
----- Original Message -----
From: "Mark Maunder" <ma...@swiftcamel.com>
To: <mo...@apache.org>
Sent: Wednesday, September 19, 2001 5:21 PM
Subject: Shared cache with IPC::Shareable


> Hi all,
>
> I'm sharing memory between httpd processes using IPC::Shareable. It is
working
> but seems to behave inconsistently (memory is often not being freed
etc..). I'm
> using it for creating common cached areas for file and database contents
shared
> between httpd children. Is there a better way to do this i.e. Am I stuck
with
> IPC::Shareable? I'm running mod_perl and the whole application is running
as a
> single content handler.
>
> It also isn't as fast as I thought it would be  - sure it takes a long
time to
> do the initial load of all caches on the first request, but I just thought
it
> would be a little faster than it is. Are there any performance issues I
should
> be aware of with IPC::Shareable or shared mem in general?
>
> Thanks!
>
> ~mark
>
>
>
>

Re: Shared cache with IPC::Shareable

[Perrin Harkins <pe...@elem.com>]

> I'm sharing memory between httpd processes using IPC::Shareable. It is
working
> but seems to behave inconsistently (memory is often not being freed
etc..). I'm
> using it for creating common cached areas for file and database contents
shared
> between httpd children. Is there a better way to do this i.e. Am I stuck
with
> IPC::Shareable? I'm running mod_perl and the whole application is running
as a
> single content handler.
>
> It also isn't as fast as I thought it would be  - sure it takes a long
time to
> do the initial load of all caches on the first request, but I just thought
it
> would be a little faster than it is. Are there any performance issues I
should
> be aware of with IPC::Shareable or shared mem in general?

Yes, shared memory can be pretty slow.  You should look at Cache::Cache
(specifically the file cache) or MLDBM::Sync.
- Perrin