High usage of redis hget with attribute group_price

[midlan]

Preconditions (*)

1. Product attribute group_price installed

Steps to reproduce (*)

1. Visit product page

Result (*)

After we installed the group_price attribute, it really slowed down our product page by many calls to redis hget:

To fix it, I disabled (rewrite) the method Mage_Catalog_Model_Product_Attribute_Backend_Groupprice_Abstract::afterLoad.

Here is newrelic backtrace where I spotted the problem:

[tmotyl]

what exactly do you mean by "Product attribute group_price installed" ?

[midlan]

@tmotyl I mean this attribute:
https://github.com/OpenMage/magento-lts/blob/1.9.4.x/app/code/core/Mage/Catalog/sql/catalog_setup/upgrade-1.6.0.0.9-1.6.0.0.10.php#L127

[joshua-bn]

What did you do to install/enable/disable it?

[midlan]

@joshua-bn
I did this:

class MyRewrite extends Mage_Catalog_Model_Product_Attribute_Backend_Groupprice {

    public function afterLoad($object) {
        return $this; //afterload disabled due to poor performance
    }

}

[fballiano]

So is this the function that's causing the problem?
https://github.com/OpenMage/magento-lts/blob/1.9.4.x/app/code/core/Mage/Catalog/Model/Product/Attribute/Backend/Groupprice/Abstract.php#L221-L252

probably the loadPriceData()?

[midlan]

@fballiano yes the link points to the problematic function