1 .NET Framework FunctionDetails Consider using StringBuilder for string concatenations. Or 5 mscorlib.ni.dll System.String.Concat(.*) InclSamplesPercent false 5 mscorlib.dll System.String.Concat(.*) InclusiveApplicationTimePercent false vs.performance.rules.DA0001 Warning 2 Tool Guidance Summary It appears that the file was collected without properly setting the environment variables with VSPerfCLREnv.cmd. Symbols for managed binaries may not resolve. IsVsPerfCorProfMissing vs.performance.rules.DA0002 Error 3 Tool Guidance Summary You have a high proportion of samples in Kernel Mode. This might indicate a high volume of I/O activity or a high rate of context switching. Consider profiling your application again using Instrumentation Mode. And IsSampling And NumKernelSamples TotalSamples 75 TotalSamples 750 GreaterThan vs.performance.rules.DA0003 Warning 4 Tool Guidance Marks Your processor usage is consistently above 75%. Consider using Sampling mode for CPU-bound applications. And IsInstrumentation \Processor(_Total)\% Processor Time 75 Average false 10 vs.performance.rules.DA0004 Warning 5 .NET Framework Summary Many of your objects are being collected in generation 2 garbage collection. ManyGC2Collections vs.performance.rules.DA0005 Warning 6 .NET Framework FunctionDetails Override Equals and equality operator on value types. 3 mscorlib.ni.dll System.ValueType.Equals(object) InclSamplesPercent false vs.performance.rules.DA0006 Warning 7 .NET Framework Marks A high number of exceptions are consistently being thrown. Consider reducing the use of exceptions in program logic. \.NET CLR Exceptions(@Instance)\# of Exceps Thrown / sec 10 Average true 25 vs.performance.rules.DA0007 Warning 8 Tool Guidance Summary Only a small number of samples were collected. Consider a longer run or faster sampling rate for more significant results. And IsSampling And IsAllocation true TotalSamples 300 LessThan vs.performance.rules.DA0008 Warning 10 .NET Framework FunctionDetails GetHashCode functions should be cheap and not allocate any memory. Reduce complexity of hash code function if possible. Or 5 .* .*.GetHashCode() InclSamplesPercent false Or 5 .* .*.GetHashCode() InclusiveApplicationTimePercent false 0 .* (?!System).*\.GetHashCode\(\) InclAllocsPercent true vs.performance.rules.DA0010 Warning 11 .NET Framework FunctionDetails CompareTo functions should be cheap and not allocate any memory. Reduce complexity of CompareTo function if possible. Or 5 .* .*CompareTo(object) InclSamplesPercent false Or 5 .* .*CompareTo(object) InclusiveApplicationTimePercent false 0 .* .*CompareTo(object) InclAllocsPercent false vs.performance.rules.DA0011 Warning 12 .NET Framework FunctionDetails You may be using Reflection excessively. It is an expensive operation. Or Or 5 mscorlib.ni.dll System.Type.InvokeMember(.*) InclSamplesPercent false 5 mscorlib.ni.dll System.Reflection.*.Get.*(.*) InclSamplesPercent false Or 5 mscorlib.dll System.Type.InvokeMember(.*) InclusiveApplicationTimePercent false 5 mscorlib.dll System.Reflection.*.Get.*(.*) InclusiveApplicationTimePercent false vs.performance.rules.DA0012 Warning 13 .NET Framework FunctionDetails Consider reducing use of String.Split and String.Substring functions. Or Or 3 mscorlib.ni.dll System.String.Substring(.*) InclSamplesPercent false 3 mscorlib.ni.dll System.String.Split(.*) InclSamplesPercent false Or 3 mscorlib.dll System.String.Substring(.*) InclusiveApplicationTimePercent false 3 mscorlib.dll System.String.Split(.*) InclusiveApplicationTimePercent false vs.performance.rules.DA0013 Warning 14 MemoryAndPaging Marks An extremely high rate of paging active memory to disk is occurring. Your application may be memory-bound. \Memory\Pages/sec 500 Average false 25 17 vs.performance.rules.DA0014 Warning 17 .NET Framework Marks A high rate of paging active memory to disk is occurring. Your application may be memory-bound. \Memory\Pages/sec 300 Average false 10 vs.performance.rules.DA0017 Information 18 .NET Framework Marks Managed memory allocations approaching the default limit for a 32-bit process. Your application may be memory-bound. And Is64Bit true Or \.NET CLR Memory(@Instance)\# Bytes in all Heaps 750000000 Maximum true 10 \.NET CLR Memory(@Instance)\# Total committed bytes 750000000 Maximum true 10 vs.performance.rules.DA0018 Warning 21 .NET Framework Marks Relatively high rate of Gen 1 garbage collections is occurring. If, by design, most of your program's data structures are allocated and persisted for a long time, this is not ordinarily a problem. However, if this behavior is unintended, your app may be pinning objects. If you are not certain, you can gather .NET memory allocation data and object lifetime information to understand the pattern of memory allocation your application uses. And \.NET CLR Memory(@Instance)\# Gen 0 Collections 30 Maximum true 10 \.NET CLR Memory(@Instance)\# Gen 0 Collections \.NET CLR Memory(@Instance)\# Gen 1 Collections 5 LessThan true 10 vs.performance.rules.DA0021 Information 22 .NET Framework Marks There is a relatively high rate of Gen 2 garbage collections occurring. If, by design, most of your program's data structures are allocated and persisted for a long time, this is not ordinarily a problem. However, if this behavior is unintended, your app may be pinning objects. If you are not certain, you can gather .NET memory allocation data and object lifetime information to understand the pattern of memory allocation your application uses. And \.NET CLR Memory(@Instance)\# Gen 0 Collections 50 Maximum true 10 \.NET CLR Memory(@Instance)\# Gen 1 Collections \.NET CLR Memory(@Instance)\# Gen 2 Collections 5 LessThan true 10 21 vs.performance.rules.DA0022 Warning 23 .NET Framework Marks % Time in GC is relatively high. This indication of excessive amount of garbage collection overhead could be impacting the responsiveness of your application. You can gather .NET memory allocation data and object lifetime information to understand the pattern of memory allocation your application uses better. And \.NET CLR Memory(@Instance)\# Gen 0 Collections 30 Maximum true 10 \.NET CLR Memory(@Instance)\% Time in GC 10 GreaterThan true 10 vs.performance.rules.DA0023 Information 24 .NET Framework Marks % Time in GC is very high. There is an excessive amount of garbage collection overhead. And \.NET CLR Memory(@Instance)\# Gen 0 Collections 30 Maximum true 10 \.NET CLR Memory(@Instance)\% Time in GC 40 GreaterThan true 10 23 vs.performance.rules.DA0024 Warning 25 ProcessorUsage Marks Relatively high amount of kernel mode CPU time was measured. You should investigate the source with SysCall sampling enabled. And \Processor(_Total)\% Processor Time 30 Average false 10 \Processor(_Total)\% Privileged Time \Processor(_Total)\% User Time 1 GreaterThan Average false 10 vs.performance.rules.DA0025 Information 26 Tool Guidance Marks Relatively high amount of kernel mode CPU time was measured. Consider investigating the source with SysCall sampling enabled. And \Process(@Instance)\% Processor Time 50 Average true 10 And IsSysCallSampling true \Process(@Instance)\% Privileged Time \Process(@Instance)\% User Time 1 GreaterThan Average true 10 vs.performance.rules.DA0026 Information 29 Tool Guidance Summary An unsupported CLR version was detected during collection. Managed symbols may not resolve correctly. IsUnsupportedCLR vs.performance.rules.DA0029 Warning 30 Tool Guidance FunctionDetails Gathering interaction measurements for multi-tiered applications will help you understand database usage patterns and key data access delays. Try profiling the application again with the Tier Interaction Profiling option enabled. And IsTip true Or Or 2 System.Data.dll System.Data.* InclSamplesPercent false 2 System.Data.ni.dll System.Data.* InclSamplesPercent false 2 System.Data.Linq.ni.dll System.Data.* InclSamplesPercent false vs.performance.rules.DA0030 Information 37 Resource monitoring Marks The Process Private Bytes counter that measures virtual memory allocated by the process you are profiling is approaching the architectural limit of a 32-bit process. The value reported is the maximum observed over all measurement intervals. And Is64Bit true \Process(@Instance)\Private Bytes 1750000000 GreaterThan Maximum true 10 vs.performance.rules.DA0037 Information 38 .NET Framework Marks A high rate of .NET Lock contentions is occurring. Please investigate the reason for this lock contention by running a Concurrency profile. And IsResourceContention true \.NET CLR LocksAndThreads(@Instance)\Contention Rate / sec 1 Average true 25 vs.performance.rules.DA0038 Information 39 .NET Framework Marks A very high rate of .NET Lock contentions is occurring. Please investigate the reason for this lock contention by running a Concurrency profile. And IsResourceContention true \.NET CLR LocksAndThreads(@Instance)\Contention Rate / sec 3 Average true 25 38 vs.performance.rules.DA0039 Warning 40 Tool Guidance Summary User-Mode Scheduling (UMS) sampling profiling is not supported. The application was terminated. IsUmsAppTerminated vs.performance.rules.DA0040 Error 501 Resource monitoring Marks Average CPU consumption by the Process being profiled. \Process(@Instance)\% Processor Time 0 GreaterThan Average true 10 vs.performance.rules.DA0501 Information 502 Resource monitoring Marks This rule is for information only. The Process()\% Processor Time counter measures CPU consumption of the process you are profiling. The value reported is the maximum observed over all measurement intervals. \Process(@Instance)\% Processor Time 0 GreaterThan Maximum true 10 vs.performance.rules.DA0502 Information 503 Resource monitoring Marks This information was gathered for information only. The Process Working Set counter measures physical memory usage by the process you are profiling. The value reported is the average computed over all measurement intervals. \Process(@Instance)\Working Set 0 GreaterThan Average true 10 vs.performance.rules.DA0503 Information 504 Resource monitoring Marks This rule is for information only. The Process Working Set counter measures physical memory usage by the process you are profiling. The value reported is the maximum observed over all measurement intervals. \Process(@Instance)\Working Set 0 GreaterThan Maximum true 10 vs.performance.rules.DA0504 Information 505 Resource monitoring Marks This information was gathered for information only. The Process Private Bytes counter measures virtual memory allocated by the process you are profiling that cannot be shared with other processes. The value reported is the average computed over all measurement intervals. \Process(@Instance)\Private Bytes 0 GreaterThan Average true 10 vs.performance.rules.DA0505 Information 506 Resource monitoring Marks This rule is for information only. The Process Private Bytes counter measures virtual memory allocated by the process you are profiling that cannot be shared with other processes. The value reported is the maximum observed over all measurement intervals. \Process(@Instance)\Private Bytes 0 GreaterThan Maximum true 10 vs.performance.rules.DA0506 Information