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APC showing wrong pages Reply

Group: php.apc.dev Subscribe Posted:3/18/2007 1:41:55 PM Replies:0 Views:13 Items(0)
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Hello,

I noticed APC returning the cached values of the wrong pages. I'd bring up
x.php in my browser and see (apparently cached) content from y.php, then
reload again and see the (correct) content from x.php.

Is this a known problem? Is the current version of APC recommended for prod
environments?

Thanks,
--Craig

Version info:
- APC 3.0.13
- Apache/2.0.55 (Ubuntu)
- PHP/5.1.2

------=_Part_12570_21496387.1174225315035--
cr...@memorizable.org ("Craig Muth")
3/18/2007 1:41:55 PM




Craig Muth wrote:
> I noticed APC returning the cached values of the wrong pages. I'd bring up
> x.php in my browser and see (apparently cached) content from y.php, then
> reload again and see the (correct) content from x.php.

I've never seen this happen myself - so if you have a decent enough
testcase, I'll be able to poke around it.

Some of the common issues happen with cvs/svn based sites which munge
mtime to make a file look older, eventhough it has been rewritten to
disk - BSD has known issues with that, but I assumed linux was immune
to it. So, if you are using something other than ext3, that would be
useful information to know.

On the other hand, you can also put printfs in apc_cache.c in a couple
of places (wherever slot->key.* is compared to key.*) to get some
debug info out of it.

> Is this a known problem? Is the current version of APC recommended for
> prod environments?

No, this isn't a known problem. And there are a couple of fixes in APC
HEAD which are sort of good/necessary to run APC 3.0.13 in production.
See the patches marked in

http://pecl.php.net/bugs/bug.php?id=10314

Cheers,
Gopal
--
The difference between insanity and genius is measured by success
gop...@yahoo-inc.com (Gopal V)
3/20/2007 2:20:02 AM


There is this open bug: http://pecl.php.net/bugs/bug.php?id=9969, but
we haven't received feedback on it.

You may want to try the ctime option in the latest release to see if
it corrects your problem, if so the files are probably getting
backdated/updated in some way that should possibly be corrected
depending on your configuration/setup.

-shire

On Mar 19, 2007, at 7:20 PM, Gopal V wrote:

> Craig Muth wrote:
>> I noticed APC returning the cached values of the wrong pages. I'd
>> bring up
>> x.php in my browser and see (apparently cached) content from
>> y.php, then
>> reload again and see the (correct) content from x.php.
>
> I've never seen this happen myself - so if you have a decent enough
> testcase, I'll be able to poke around it.
>
> Some of the common issues happen with cvs/svn based sites which munge
> mtime to make a file look older, eventhough it has been rewritten to
> disk - BSD has known issues with that, but I assumed linux was immune
> to it. So, if you are using something other than ext3, that would be
> useful information to know.
>
> On the other hand, you can also put printfs in apc_cache.c in a couple
> of places (wherever slot->key.* is compared to key.*) to get some
> debug info out of it.
>
>> Is this a known problem? Is the current version of APC
>> recommended for prod environments?
>
> No, this isn't a known problem. And there are a couple of fixes in APC
> HEAD which are sort of good/necessary to run APC 3.0.13 in production.
> See the patches marked in
>
> http://pecl.php.net/bugs/bug.php?id=10314
>
> Cheers,
> Gopal
> --
> The difference between insanity and genius is measured by success
>
> --
> APC Development Mailing List (http://pecl.php.net/APC)
> To unsubscribe, visit: http://www.php.net/unsub.php
>

- Shire
shire@facebook.com
shire@php.net
sh...@php.net (Brian Shire)
3/20/2007 2:34:36 AM


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