User and Reference Guide

  • 2020
  • 10/23/2020
  • Public Content

Enabling and Disabling Tracing

To start recording trace data (enable tracing), use the
!enable
command. To stop recording trace data (disable tracing), use the
!disable
command.
As long as tracing is enabled, the trace output buffer gets filled. When the buffer is full, older trace data is overwritten by newer trace data. To make sure useful trace data is not overwritten, it is recommended to disable tracing as early as possible.
To show the current enable state, use the
!showenable
command.
The following is an example how to use the
!enable
and
!disable
commands together with
!showenable
:
2: kd> !showenable <0> Tracing is disabled. <1> Tracing is disabled. <2> Tracing is disabled. <3> Tracing is disabled. 2: kd> !enable 2: kd> !showenable <0> Tracing is enabled. <1> Tracing is enabled. <2> Tracing is enabled. <3> Tracing is enabled. 2: kd> !disable /here 2: kd> !showenable <0> Tracing is enabled. <1> Tracing is enabled. <2> Tracing is disabled. <3> Tracing is enabled. 2: kd> !disable 2: kd> !showenable <0> Tracing is disabled. <1> Tracing is disabled. <2> Tracing is disabled. <3> Tracing is disabled.

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