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Overhead time is the time the system takes to deliver a shared resource from a releasing owner to an acquiring owner. Spin time, the Overhead time should be close spin time zero because it means the resource is spin time being wasted through idleness. However, not all CPU time in a parallel application may be spent on doing real payload work.
For example, if you increase the number of threads performing some fixed load of work in parallel, each thread gets less work and the overhead, as a relative measure, will get larger.
It is a basic application of Amdahl's Law. VTune Amplifier classifies the stack layers into user, system, and overhead layers and attributes the CPU time spent in system functions called by overhead functions to the overhead functions.
Spin spin time is spin time Wait time during which the CPU is busy. This often occurs when a synchronization API causes australia casino map CPU to poll while the software thread is waiting. Some Spin time may be preferable to the alternative of increased thread context spin time. Too much Spin time, however, can reflect lost opportunity for productive work.
VTune Amplifier provides the combined Overhead and Spin Time metric in the grid and Timeline view of the Hotspots spin time CPU Usage, Hotspots by Thread Concurrency, and Spin time viewpoints. To view the Overhead and Spin time values separately, expand the column by clicking the casino caribbean. A significant portion spin time CPU time is spent in synchronization or threading overhead.
Consider increasing task granularity or the scope of data synchronization. Join today Log in. Knights Landing Analysis Workflow MPI Application Analysis Workflow Key Concepts Analysis Target Clockticks Vs.
Application Sets Its Own Handler for Signal Error Message: Cannot Load Data File Error Message: Cannot Open Data Error Message: Make Read article You Have Root Privileges to Analyze Processor Graphics Hardware Events Error Message: No Carson casinos city nv Driver Exists for This System Error Message: Problem Accessing the Sampling Driver Error Message: Required Key Not Available Error Message: Stack Size Is Too Small Error Message: Symbol Spin time Is Not Found Problem: Guessed Stack Frames Problem: Inaccurate Sum in the Grid Spin time No GPU Usage Data Is Collected Problem: Platform Not Http://freekeylogger.biz/casino-stories.php Problem: Same Functions Are Compared As Different Instances Problem: Skipped Stack Frames Problem: Stack in the Top-Down Tree Window Is Incorrect Problem: Stacks in Call Stack and Bottom-Up Panes Are Different Problem: System Functions Appear in the User Functions Only Mode Problem: VTune Click the following article is Slow to Respond When Collecting or Displaying Data Problem: Unexpected Paused Time Problem: Unknown Critical Error Due to Disabled Loopback Interface Problem: Call Stack Pane Context Menus: Project Navigator Context Menus: Application Parameters Dialog Box: Select Package Dialog Box: Select Process Dialog Box: Source Search Dialog Box: User-defined Environment Variables Hot Keys Menu: Intel VTune Amplifier Pane: Spin time - General Pane: Options - Result Location Pane: Bandwidth - Platform Power Analysis Window: Bottom-up - Memory Spin time Window: Core Wake-ups - Platform Power Analysis Window: Correlate Metrics - Platform Power Analysis Window: Event Count - Hardware Events Window: Graphics - GPU Hotspots Window: Graphics - Hotspots Window: NC Device States - Platform Power Analysis Window: Platform Power Analysis Spin time Power - Platform Power Analysis Window: Sample Spin time - Hardware Events Window: SC Device States - Platform Power Analysis Window: Summary - Disk Input and Output Summary Window: Spin time - General Exploration Window: Summary - GPU Hotspots Window: Summary - Hardware Events Window: Summary - Hardware Issues Window: Summary - Hotspots Window: Summary - Hotspots by CPU Usage Window: Summary - Hotspots by Thread Concurrency Window: Summary - HPC Performance Characterization Window: Summary - Locks and Waits Window: Summary - Memory Consumption Window: Summary - Memory Usage Window: Summary - Platform Power Analysis Window: Summary - TSX Exploration Window: System Sleep States - Platform Power Analysis Window: Temperature - Platform Power Analysis Window: Timer Resolution - Platform Power Analysis Window: Uncore Event Count - Hardware Events Window: Spin and Overhead Time Overhead Time Overhead time is the time the system takes to deliver a shared resource from a releasing owner to an acquiring owner.
Spin Time Spin time is the Wait time during which the CPU is busy. Overhead and Spin See more VTune Amplifier provides the read article Overhead and Spin Time metric in the grid and Timeline view of the Hotspots by CPU Usage, Hotspots by Thread Concurrency, and Hotspots viewpoints.
Note VTune Amplifier ignores the Overhead and Spin time when spin time the CPU Usage metric. Possible Issues A significant portion of CPU time is spent in synchronization or threading overhead. Atomics Creation Other Reduction Scheduling Tasking See Also Self Time and Total Time. For more complete information about compiler optimizations, see our Optimization Notice. Look for us on: