IIS stop responding - W3WP massive memory Usage

A very common problem in SharePoint portal is W3WP that going crazy. In some cases the memory usage is 900MB to 1GB. Obviously, in this situation the IIS on the Front-End Servers will stop responding.

Two things must be considered.
One – we need to solve the problem, taking into consideration the existing situation. And it will expand down.

Two– we need to consider whether the system hardware can deal with the amount of references to applications. This is because such problems are usually lack of resources - mainly processing capabilities (CPU) or a lack of available memory (RAM).
In such situation I recommend to re-edit the SharePoint Capacity planning…

How to fix the problem:
First we need to log on to the front end servers.
Start the IIS Console. On the portal application pool right-click the mouse and mark properties.
The properties window will open and in the Recycling tab we need to check the "Maximum used memory".




The value that I found is working for me – 500-600MB.

How to fix Blank IIS

From time to time I came across SharePoint farms that have a blank IIS server, in some cases the IIS MMC stops responding at all. Those errors accompany by event log errors:
o Event ID 6398
o Event ID 6482
o Event ID 7076

My first action is to reset the IIS – this fix the problem for a short while…

To fix this errors permanently we need to install the appropriate hotfix and restart the server. If you have multiple servers farm, the hotfix must be apply on all servers

The link to download the fix:
link