Author Archives: Nikolay Mitikov

Case study: polluted reports

Agenda Analytics reports have suspicious statistics with lower conversion rates compared to other systems. Can we find out why? It seem that healthy data is diluted with junk/empty interactions with no value. We assume robot/crawlers activity gets recorded. Is there any OOB protection in Sitecore? Filter out robots by user agents Sitecore blacklists robots viaContinue reading “Case study: polluted reports”

Performance crime: config to kill performance

Would you as a developer allow a setting that can make system 15 550 times slower? I’ve received a few memory dumps with high CPU; each scavenges AccessResultCache: How big is the cache so that every snapshot contains the operation? Detecting cache size from the snapshot A ClrMD code snippet locates objects in Sitecore.Caching.Generics.Cache namespaceContinue reading “Performance crime: config to kill performance”

Performance crime: wrong size detection

The amount of memory cache can use is defined in config: That is needed to protect against disk thrashing – running out of physical RAM so that disk is used to power virtual memory (terribly slow). That is a big hazard in Azure WebApps – much less RAM compared to old-school big boxes. Sitecore keepsContinue reading “Performance crime: wrong size detection”

Performance crime: careless allocations

I was investigating Sitecore Aggregation case a time back and my attention was caught by GC Heap Allocation mentioning RequiresValidator in top 10: Combining all generic entries together leads to over 7% of total allocations making it second most expensive type application wide! Yes, all it does is check object is not null Yes, itContinue reading “Performance crime: careless allocations”