User Guide

Contents

Warnings about Accurate CPU Time Collection

The following table lists warning messages you may encounter on Windows* OS when collecting data in the highly accurate CPU time detection mode (enabled by default) and suggests solutions.
Warning
Cause and Possible Solution
Accurate CPU time detection was disabled. Another collection in this mode is already running on the system.
Cause
Another collection with accurate CPU time detection is running on the system or was not terminated properly.
Solution
Make sure the other collection has finished and try again. Only one
VTune
Profiler
collection can run with accurate CPU time detection on the system at a time.
Accurate CPU time detection was disabled. The NT Kernel Logger is already in use
.
Cause
VTune
Profiler
requires the Microsoft* NT Kernel Logger to capture precise CPU time data. The NT Kernel Logger is a system-wide resource which cannot be shared by different processes. Other tools, such as the Xperf utility of the Windows* Performance Tools Kit may use the NT Kernel Logger at the same time.
Solution
Make sure that other tools do not use the NT Kernel Logger and try again.
Accurate CPU time detection was disabled. Drive <drive name> has not enough disk space
.
Cause
The temporary folder for storing accurate CPU time data is located on a drive with insufficient free space.
Solution
Make sure you have enough space on the drive. The free space must be not less than specified in the
Limit collected data by: Result size from collection start
option on the
WHAT
pane of the
Configure Analysis
window.
Highly accurate CPU time collection is disabled for this analysis. To enable this feature, run the product with the administrative privileges.
Cause
VTune
Profiler
requires administrative privileges to enable accurate CPU time detection.
Solution
Make sure you are running the collection as a local administrator.
Accurate CPU time detection was disabled. The temporary data path <full path to file> is longer than 1024 symbols.
Cause
VTune
Profiler
uses temporary files to collect precise CPU time data. The length of the path to the temporary files cannot be longer than 1024 symbols.
Solution
Make sure the TEMP environment variable for the path to the temporary files is no longer than 1024 symbols.
Accurate CPU time detection was disabled. This mode is not supported on this OS.
Cause
Some operating systems may not support accurate CPU time detection. For the list of supported operating systems, please see the
System Requirements
section of the product
Release Notes
.

Product and Performance Information

1

Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors. These optimizations include SSE2, SSE3, and SSSE3 instruction sets and other optimizations. Intel does not guarantee the availability, functionality, or effectiveness of any optimization on microprocessors not manufactured by Intel. Microprocessor-dependent optimizations in this product are intended for use with Intel microprocessors. Certain optimizations not specific to Intel microarchitecture are reserved for Intel microprocessors. Please refer to the applicable product User and Reference Guides for more information regarding the specific instruction sets covered by this notice.

Notice revision #20110804