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[pull] master from wolfpld:master #25

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Jun 8, 2020
Merged

[pull] master from wolfpld:master #25

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1e8c842
Update manual.
wolfpld Jun 8, 2020
284d49b
Change rdtscp check to rdtsc check.
wolfpld Jun 8, 2020
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Change rdtscp check to rdtsc check.
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@wolfpld
wolfpld committed Jun 8, 2020
commit 284d49b34ba160b3f8e7b555bf162bf767e978ff
2 changes: 1 addition & 1 deletion client/TracyProfiler.cpp
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Expand Up @@ -224,7 +224,7 @@ static int64_t SetupHwTimer()
#ifndef TRACY_TIMER_QPC
uint32_t regs[4];
CpuId( regs, 0x80000001 );
if( !( regs[3] & ( 1 << 27 ) ) ) InitFailure( "CPU doesn't support RDTSCP instruction." );
if( !( regs[3] & ( 1 << 4 ) ) ) InitFailure( "CPU doesn't support RDTSC instruction." );
CpuId( regs, 0x80000007 );
if( !( regs[3] & ( 1 << 8 ) ) )
{
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2 changes: 1 addition & 1 deletion manual/tracy.tex
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Expand Up @@ -452,7 +452,7 @@ \subsubsection{Problematic platforms}

\paragraph{Cloud service providers}

In some cases you actually don't own the hardware, but lend it from someone else. In such circumstances you might be running inside a virtual machine, which may be configured to prohibit you from using the bare metal facilities needed by Tracy\footnote{Or you might just be using a quite old CPU, which doesn't have support for required features.}. One example of such limitation would be lack of access to a reliable time stamp register readings, which will prevent the application from starting with either 'CPU doesn't support RDTSCP instruction' or 'CPU doesn't support invariant TSC' error message. If you are using Windows, you may workaround this issue by rebuilding the profiled application with the \texttt{TRACY\_TIMER\_QPC} macro, but be aware that it will severely lower the resolution of timer readings.
In some cases you actually don't own the hardware, but lend it from someone else. In such circumstances you might be running inside a virtual machine, which may be configured to prohibit you from using the bare metal facilities needed by Tracy\footnote{Or you might just be using a quite old CPU, which doesn't have support for required features.}. One example of such limitation would be lack of access to a reliable time stamp register readings, which will prevent the application from starting with either 'CPU doesn't support RDTSC instruction' or 'CPU doesn't support invariant TSC' error message. If you are using Windows, you may workaround this issue by rebuilding the profiled application with the \texttt{TRACY\_TIMER\_QPC} macro, but be aware that it will severely lower the resolution of timer readings.

\subsubsection{Changing network port}

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