APCu Caching not working?

Milton Ngan

6 Jul 2021 6 Jul '21

11:39 a.m.

I have noticed that when I enable webUI caching, that the page loads don’t speed up. It regularly takes 3 seconds to render a page, although the tool tip at the bottom shows APCu caching is enabled. However, if I force the cache driver to “files”, then I see a huge speed up (page loads drop to about 100-200ms).

Is there some extra config to get APCu working correctly? I didn’t see anything in the docs, but I could have missed it.

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Markus Klock

6 Jul 6 Jul

12:24 p.m.

Did you install the php-apcu package? sudo apt-get install -y php-apcu

/Markus

Den tis 6 juli 2021 kl 18:40 skrev Milton Ngan via observium < observium@observium.org>:

...

I have noticed that when I enable webUI caching, that the page loads don’t speed up. It regularly takes 3 seconds to render a page, although the tool tip at the bottom shows APCu caching is enabled. However, if I force the cache driver to “files”, then I see a huge speed up (page loads drop to about 100-200ms).

Is there some extra config to get APCu working correctly? I didn’t see anything in the docs, but I could have missed it.

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Milton Ngan

1 p.m.

APCu is definitely installed. PHP sees it, Observium sees it. But when you use /cache_info in the URL you can see it constantly writing back to the cache, and never getting any hits.

[cid:4C52A6D3-703A-4C3D-8A3D-12A2015D5F2D][cid:D5B4B8B5-7869-4266-A35A-89C1A9BB2984]

On Jul 6, 2021, at 10:24 AM, Markus Klock via observium <observium@observium.orgmailto:observium@observium.org> wrote:

Did you install the php-apcu package? sudo apt-get install -y php-apcu

/Markus

Den tis 6 juli 2021 kl 18:40 skrev Milton Ngan via observium <observium@observium.orgmailto:observium@observium.org>: I have noticed that when I enable webUI caching, that the page loads don’t speed up. It regularly takes 3 seconds to render a page, although the tool tip at the bottom shows APCu caching is enabled. However, if I force the cache driver to “files”, then I see a huge speed up (page loads drop to about 100-200ms).

Is there some extra config to get APCu working correctly? I didn’t see anything in the docs, but I could have missed it.

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Adam Armstrong

7 Jul 7 Jul

4:35 a.m.

What version of PHP is this to have a 3 year old apcu?

Adam.

Sent from my iPhone

...

On 7 Jul 2021, at 10:32, Milton Ngan via observium observium@observium.org wrote:

APCu is definitely installed. PHP sees it, Observium sees it. But when you use /cache_info in the URL you can see it constantly writing back to the cache, and never getting any hits.

<Screen Shot 2021-07-05 at 2.20.18 PM.png> <Screen Shot 2021-07-06 at 10.57.39 AM.png>

...
On Jul 6, 2021, at 10:24 AM, Markus Klock via observium observium@observium.org wrote:

Did you install the php-apcu package? sudo apt-get install -y php-apcu

/Markus

Den tis 6 juli 2021 kl 18:40 skrev Milton Ngan via observium observium@observium.org:

...
I have noticed that when I enable webUI caching, that the page loads don’t speed up. It regularly takes 3 seconds to render a page, although the tool tip at the bottom shows APCu caching is enabled. However, if I force the cache driver to “files”, then I see a huge speed up (page loads drop to about 100-200ms).

Is there some extra config to get APCu working correctly? I didn’t see anything in the docs, but I could have missed it.

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Milton Ngan

9:47 a.m.

this is running on ubuntu18.04 with php7.2. but i repro’ed the issue on ubuntu 20.04 with php7.4.

Sent from my iPad

On Jul 7, 2021, at 2:35 AM, Adam Armstrong via observium observium@observium.org wrote:

What version of PHP is this to have a 3 year old apcu?

Adam.

Sent from my iPhone

On 7 Jul 2021, at 10:32, Milton Ngan via observium observium@observium.org wrote:

APCu is definitely installed. PHP sees it, Observium sees it. But when you use /cache_info in the URL you can see it constantly writing back to the cache, and never getting any hits.

On Jul 6, 2021, at 10:24 AM, Markus Klock via observium <observium@observium.orgmailto:observium@observium.org> wrote:

Did you install the php-apcu package? sudo apt-get install -y php-apcu

/Markus

Is there some extra config to get APCu working correctly? I didn’t see anything in the docs, but I could have missed it.

_______________________________________________ observium mailing list observium@observium.org http://postman.memetic.org/cgi-bin/mailman/listinfo/observium _______________________________________________ observium mailing list observium@observium.org http://postman.memetic.org/cgi-bin/mailman/listinfo/observium

Graeme Davis

8 Jul 8 Jul

7:07 a.m.

Our main Observium instance has been loading very slow recently ... I disabled APCu (caching was set to auto) and it's soooo much faster now! We're on CentOS 7 / PHP 7.4 / MariaDB 10.2

Thanks, Graeme

On Wed, Jul 7, 2021 at 10:47 AM Milton Ngan via observium < observium@observium.org> wrote:

...

this is running on ubuntu18.04 with php7.2. but i repro’ed the issue on ubuntu 20.04 with php7.4.

Sent from my iPad

On Jul 7, 2021, at 2:35 AM, Adam Armstrong via observium < observium@observium.org> wrote:

What version of PHP is this to have a 3 year old apcu?

Adam.

Sent from my iPhone

On 7 Jul 2021, at 10:32, Milton Ngan via observium < observium@observium.org> wrote:

APCu is definitely installed. PHP sees it, Observium sees it. But when you use /cache_info in the URL you can see it constantly writing back to the cache, and never getting any hits.

<Screen Shot 2021-07-05 at 2.20.18 PM.png> <Screen Shot 2021-07-06 at 10.57.39 AM.png>

On Jul 6, 2021, at 10:24 AM, Markus Klock via observium < observium@observium.org> wrote:

Did you install the php-apcu package? sudo apt-get install -y php-apcu

/Markus

Den tis 6 juli 2021 kl 18:40 skrev Milton Ngan via observium < observium@observium.org>:

...
I have noticed that when I enable webUI caching, that the page loads don’t speed up. It regularly takes 3 seconds to render a page, although the tool tip at the bottom shows APCu caching is enabled. However, if I force the cache driver to “files”, then I see a huge speed up (page loads drop to about 100-200ms).

Is there some extra config to get APCu working correctly? I didn’t see anything in the docs, but I could have missed it.

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Adam Armstrong

7:39 a.m.

The caching stuff is sort of vaguely worthless and should really only be used when you absolutely know you need and and understand what it does.

It caches some db queries so some of the data you see in the UI will be out of date, wrong counts in menus, status summary, etc.

It should really only be used when an instance is so massive it’s not possible to make MySQL fast enough.

Adam.

From: observium observium-bounces@observium.org On Behalf Of Graeme Davis via observium Sent: 08 July 2021 13:07 To: Observium observium@observium.org Cc: Graeme Davis graeme@graeme.org Subject: Re: [Observium] APCu Caching not working?

Our main Observium instance has been loading very slow recently ... I disabled APCu (caching was set to auto) and it's soooo much faster now! We're on CentOS 7 / PHP 7.4 / MariaDB 10.2

Thanks,

Graeme

On Wed, Jul 7, 2021 at 10:47 AM Milton Ngan via observium <observium@observium.org mailto:observium@observium.org > wrote:

this is running on ubuntu18.04 with php7.2. but i repro’ed the issue on ubuntu 20.04 with php7.4.

Sent from my iPad

On Jul 7, 2021, at 2:35 AM, Adam Armstrong via observium observium@observium.org wrote:

What version of PHP is this to have a 3 year old apcu?

Adam.

Sent from my iPhone

On 7 Jul 2021, at 10:32, Milton Ngan via observium <observium@observium.org mailto:observium@observium.org > wrote:

APCu is definitely installed. PHP sees it, Observium sees it. But when you use /cache_info in the URL you can see it constantly writing back to the cache, and never getting any hits.

On Jul 6, 2021, at 10:24 AM, Markus Klock via observium <observium@observium.org mailto:observium@observium.org > wrote:

Did you install the php-apcu package?

sudo apt-get install -y php-apcu

/Markus

Den tis 6 juli 2021 kl 18:40 skrev Milton Ngan via observium <observium@observium.org mailto:observium@observium.org >:

Is there some extra config to get APCu working correctly? I didn’t see anything in the docs, but I could have missed it.

_______________________________________________ observium mailing list observium@observium.org mailto:observium@observium.org http://postman.memetic.org/cgi-bin/mailman/listinfo/observium

Mike Stupalov

9:27 a.m.

Please try update to latest Observium revision (rolling updates).

I upgraded used caching library, there may have been some incompatibilities with recent php versions (>=7.2).

Although personally I had no problems even with php 8.0 and APCu.

Graeme Davis via observium wrote on 08.07.2021 15:07:

...

Our main Observium instance has been loading very slow recently ... I disabled APCu (caching was set to auto) and it's soooo much faster now! We're on CentOS 7 / PHP 7.4 / MariaDB 10.2

Thanks, Graeme

On Wed, Jul 7, 2021 at 10:47 AM Milton Ngan via observium <observium@observium.org mailto:observium@observium.org> wrote:

this is running on ubuntu18.04 with php7.2. but i repro’ed the
issue on ubuntu 20.04 with php7.4. 

Sent from my iPad

...

On Jul 7, 2021, at 2:35 AM, Adam Armstrong via observium
<observium@observium.org <mailto:observium@observium.org>> wrote:

 What version of PHP is this to have a 3 year old apcu?

Adam.

Sent from my iPhone

...

On 7 Jul 2021, at 10:32, Milton Ngan via observium
<observium@observium.org <mailto:observium@observium.org>> wrote:


APCu is definitely installed. PHP sees it, Observium sees it.
But when you use /cache_info in the URL you can see it
constantly writing back to the cache, and never getting any hits. 

<Screen Shot 2021-07-05 at 2.20.18 PM.png>
<Screen Shot 2021-07-06 at 10.57.39 AM.png>

...

On Jul 6, 2021, at 10:24 AM, Markus Klock via observium
<observium@observium.org <mailto:observium@observium.org>> wrote:

Did you install the php-apcu package?
sudo apt-get install -y php-apcu

/Markus 

Den tis 6 juli 2021 kl 18:40 skrev Milton Ngan via observium
<observium@observium.org <mailto:observium@observium.org>>:

    I have noticed that when I enable webUI caching, that the
    page loads don’t speed up. It regularly takes 3 seconds to
    render a page, although the tool tip at the bottom shows
    APCu caching is enabled. However, if I force the cache
    driver to “files”, then I see a huge speed up (page loads
    drop to about 100-200ms).

    Is there some extra config to get APCu working correctly? I
    didn’t see anything in the docs, but I could have missed it.


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    observium mailing list
    observium@observium.org <mailto:observium@observium.org>
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participants (5)

Adam Armstrong
Graeme Davis
Markus Klock
Mike Stupalov
Milton Ngan