• 2019 Update 3
  • 03/07/2019
  • Public Content
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Contents

Syntax
PCTRACE-FAST [on|off]
Variable
VT_PCTRACE_FAST
Default
on
for performance tracing,
off
for correctness checking
Description
Controls whether the fast, but less reliable stack unwinding is used or the slower, but less error-prone unwinding through
libunwind
. The fast unwinding relies on frame pointers, therefore all code must be compiled accordingly for it to work correctly.

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