Load Test Statistics
Load Tester collects an extensive measurements during a load test. This data is collected in samples. Each sample has multiple measurements associated with it. Depending on the measurement type, some measurements may not ba applicable during each sample and may therefore appear empty in some displays, such as the Statistics View. Unless otherwise noted, the value of each measurement in a sample pertains only to events that completed
While the term sample is used for our data storage units, it is important to understand that Load Tester does not rely on sampled
Test statistics
Test statistics are collected by the Virtual Users as the testcases are executed. The data is collected at four levels: Test Summary, Testcase, Web Page and Transaction. These levels represent narrowing scopes of data - for example: web pages may contain many transactions and a testcase may contain many web pages. In many cases, the higher levels are not simply aggregations of lower levels but measurements tailored specifically for each level.
Average Duration
Average Page Duration
Average Page Wait Time
Average Speed - The average data transfer rate of the item. For testcases, this measurement includes the total bytes transferred for all web pages and transactions and the total duration of the testcase, including think time but not repeat delay. For web pages, this includes the bytes transferred for all transactions and the total duration of the page, not including think time. For transactions, this includes bytes sent and received (the total of the size of the HTTP request and response messages) and the duration of the transaction.
Average Wait Time
Average TTFB - The average TTFB for the transaction. The Time To First Byte
Bytes/sec
Current Page Users - The number of users working on a web page at the end of the sample period. Note that working on a web page refers to the process of requesting and receiving the contents of a URL. Users that are not working on pages will either be executing think time or the repeat delay.
Errors
Hits/sec - The number of transactions completed per second. "Transactions/sec" would be more technically accurate but is not used for two reasons: (1) hits/sec is a standard industry term and (2) the term transaction
Maximum Duration
Maximum Page Duration
Maximum TTFB
Minimum Duration
Minimum Page Duration
Minimum TTFB
Pages/sec
Repeats
Time
Total Size
Users
Load Engine statistics
Load Engine statistics are collected by the load engines in the process of monitoring its own performance.
Time
CPU %
Memory % - The amount of VM memory that is available. Note that the load testing and/or the load engine, by default, is configured, by default, to use 200M of RAM. There may be more memory available. If so, see the Configuring Memory Usage page for configuration instructions.
Users - The number of VUs running in this load engine.
Total Capacity - The estimated
Engine Status
Server statistics
Server statistics are collected by the Server Agents to help assess the performance of the server OS and application servers during a load test.
Operating System
CPU %
Memory %
Context Switches / sec
Process Queue Length
Page reads/sec
Page writes/sec
Disk I/O Time %
Avg Disk Service Time
Disk Queue Length
Disk Reads/sec
Disk Writes/sec
Network bytes sent
Network bytes received
Network packets received / sec
Network packets sent / sec
Network Packets Received Errors
Network Packets Sent Errors
Network Collisions
TCP Connections Established
TCP Connection Failures
TCP Segments Retransmitted / sec
ASP.NET (Active Server Pages)
ASP.NET Active Sessions
ASP.NET Application Restarts
ASP.NET Cache Entries
ASP.NET Cache Hit Ratio
ASP.NET Cache Hits
ASP.NET Cache Misses
ASP.NET Cache Turnover Rate
ASP.NET Compilations
ASP.NET Current Requests
ASP.NET Disconnected Requests
ASP.NET Errors/sec
ASP.NET Last Request Execution Time
ASP.NET Pipeline Instance count
ASP.NET Queued Requests
ASP.NET Rejected Requests
ASP.NET Request Wait Time
ASP.NET Requests Executing
ASP.NET Requests Not Found
ASP.NET Requests Not Authorized
ASP.NET Requests Queue Length
ASP.NET Requests Succeeded
ASP.NET Requests Timed Out
ASP.NET Requests/sec
ASP.NET Sessions Timed Out
ASP.NET Sessions Abandoned
ASP.NET Unhandled Execution Errors/sec
.NET CLR (Common Language Runtime)
.NET CLR Class loader Heap Size
.NET CLR Current AppDomains
.NET CLR Current Assemblies
.NET CLR Exceptions / sec
.NET CLR Heap Size
.NET CLR Generation 0 Collections
.NET CLR Generation 1 Collections - The number of times the generation 1 objects are garbage collected. Higher generation GCs include all lower generation GCs.
.NET CLR Generation 2 Collections
.NET CLR Lock Contention Queue Length
.NET CLR Lock Contention / sec
.NET CLR Lock Contentions
.NET CLR Logical Thread Count
.NET CLR Percent Time in GC
.NET CLR Physical Thread Count
.NET CLR Recognized Thread Count
IIS (Internet Information Server)
IIS CGI Requests/sec
IIS Connection Attempts/sec
IIS Current Connections
IIS File Cache Entries
IIS File Cache Hits
IIS File Cache Hit %
IIS File Cache Misses
IIS ISAPI Extension Requests/sec
IIS Kernel URI Cache Entries
IIS Kernel URI Cache Hits
IIS Kernel URI Cache Hit %
IIS Kernel URI Cache Misses
IIS Requests/sec
IIS URI Cache Entries
IIS URI Cache Hits
IIS URI Cache Hit %
IIS URI Cache Misses
IIS+App
These statistics represent the combined processes for IIS (inetinfo), ASP.NET (aspnet_wp) and the Application Pool Process (w3wp).
IIS+App Handle Count
IIS+App Private Bytes
IIS+App Thread Count
IIS+App Virtual Bytes
IIS+App % Processor Time
http://www.webperformanceinc.com/support/suite/manual/Load_Test_Statistics.htm