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We have 3 sites running in Umbraco v7.1.8 with a total of about 4500 documents. We have 2 load balanced servers which are pointing to a single file share.
This week we have started having huge preformance issues where the CPU hits 100% and the memory keeps on increasing to about 1.5GB where it kills our servers. There is not a large amount of load on the sites.
I've set the Private Memory Limit to 1GB on each of the webservers (each one has 3GB in total) so that the app pool recycles once it hits this limit.
This site was originally v6.1.6 and was upgraded to v7.1.8 in February this year.
We have about 150 rewrite rules using the legacy UrlRewriting.Net module. I have removed 50 of the rules as this is what we have last week with no issues, however the memory is still slowly climbing.
I would like to remove all the rewrite rules and use IIS URL Rewrite instead however this will take some testing before we can go Live. I would also like to upgrade to the latest version of Umbraco but again we will have to do testing before we can put the upgrade live.
Is there anything else I can do in the meantime to ensure my sites are stable?
I should mention that the following errors are also getting logged (not sure if they're related):
2015-04-28 15:27:26,480  ERROR Umbraco.Web.Scheduling.ScheduledPublishing - [Thread 23] An error occurred with the scheduled publishingSystem.Net.WebException: The operation has timed out at System.Net.WebClient.UploadDataInternal(Uri address, String method, Byte data, WebRequest& request) at System.Net.WebClient.UploadString(Uri address, String method, String data) at Umbraco.Web.Scheduling.ScheduledPublishing.Start(ApplicationContext appContext)
2015-04-28 13:12:18,734  ERROR Umbraco.Web.Scheduling.KeepAlive - [Thread 8] Error in pingSystem.Net.WebException: The operation has timed out at System.Net.WebClient.DownloadDataInternal(Uri address, WebRequest& request) at System.Net.WebClient.DownloadString(Uri address) at Umbraco.Web.Scheduling.KeepAlive.Start(Object sender)
We found something similar to what you described in 7.1.8, also on load balanced servers - and there is a fixed issue that indicates there was a problem with that version that might be the cause. Pleased to say we ugraded to latest version without any side-effects and this solved the issue.
So that may be your best move.
In 7.2.2 I still have this problem. It took so much RAM over time and then CPU at 100% soon when there is not enough RAM.
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