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    <title>Intel Software Network Comments Feed</title>
    <link>http://software.intel.com/en-us/articles/intel-gpa-tip-cannot-sychronize-cpu-timestamps</link>
    <description></description>
    <language>en-us</language>
    <item>
      <title>By Evgeny Korostelev</title>
      <description><![CDATA[ Does any solution exist for getting synchronized timestamp clocks on Core 2 Duo ? 
I use version 4.1 of GPA and it writes that "Intel GPA The timestamp counter (TSC) in this computer may be unsynchronized among the multiple CPU cores. Tracing is disabled." ]]></description>
      <link>http://software.intel.com/en-us/articles/intel-gpa-tip-cannot-sychronize-cpu-timestamps/#comment-62882</link>
      <pubDate>Fri, 12 Aug 2011 06:04:27 -0700</pubDate>
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      <title>By Evgeny Korostelev</title>
      <description><![CDATA[ I have thought that Intel GPA is better then PIX, but it writes that "Intel GPA The timestamp counter (TSC) in this computer may be unsynchronized among the multiple CPU cores. Tracing is disabled.". And so I can't get trace capture file. Why can PIX (MS's tool) measure time, but GPA can't? ]]></description>
      <link>http://software.intel.com/en-us/articles/intel-gpa-tip-cannot-sychronize-cpu-timestamps/#comment-62883</link>
      <pubDate>Fri, 12 Aug 2011 06:09:46 -0700</pubDate>
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    </item>
    <item>
      <title>By Jeff Freeman</title>
      <description><![CDATA[ GPA uses the high resolution RTDSC (time stamp counter) for quick access to time stamp clock information. As I recall, PIX uses QueryPerformanceCounter (Perfmon style) statistics which is still susceptible to the same timing issues as RTDSC reads.  Unfortunately, my experience has noted that QueryPerformanceCounter, unlike RTDSC, has a high performance overhead which excludes it's use for real time tracing when the data volume is high such as tracing of task related data where individual reads would be done on the basis of fractions of a millisecond. ]]></description>
      <link>http://software.intel.com/en-us/articles/intel-gpa-tip-cannot-sychronize-cpu-timestamps/#comment-63408</link>
      <pubDate>Tue, 23 Aug 2011 10:06:11 -0700</pubDate>
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    <item>
      <title>By Neal P. (Intel)</title>
      <description><![CDATA[ As the modified version of this article discusses, the Intel GPA team has removed the check with the latest Intel GPA 4.1 release (4.1.153262), so you won't get this error any more -- all CPU's should be able to capture both frame files and trace files.

If you still have issues, please see the Intel GPA support forum for more info or to submit a question/issue:
   http://software.intel.com/en-us/forums/intel-graphics-performance-analyzers/

Thanks!

Neal
 ]]></description>
      <link>http://software.intel.com/en-us/articles/intel-gpa-tip-cannot-sychronize-cpu-timestamps/#comment-63762</link>
      <pubDate>Fri, 02 Sep 2011 16:08:31 -0700</pubDate>
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    <item>
      <title>By Neal P. (Intel)</title>
      <description><![CDATA[ Hello,

As a follow-on to Jeff Freeman's comments, the overhead alone of QueryPerformanceCounter can be larger than the duration of the time slices that you are trying to measure! This is "not a good thing" when trying to accurately measure events and understand the synchronization of the these events across both the CPU cores and the GPU.

Regards,

Neal ]]></description>
      <link>http://software.intel.com/en-us/articles/intel-gpa-tip-cannot-sychronize-cpu-timestamps/#comment-63763</link>
      <pubDate>Fri, 02 Sep 2011 16:12:23 -0700</pubDate>
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    </item>
    <item>
      <title>By Evgeny Korostelev</title>
      <description><![CDATA[ Thanks. The latest GPA works. ]]></description>
      <link>http://software.intel.com/en-us/articles/intel-gpa-tip-cannot-sychronize-cpu-timestamps/#comment-69639</link>
      <pubDate>Tue, 24 Jan 2012 05:37:01 -0800</pubDate>
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    </item>
    <item>
      <title>By Neal P. (Intel)</title>
      <description><![CDATA[ Hello,

Good to hear the latest version works for you. For any other questions or issues with the product, please create a new post in the GPA Support Forum: 
   http://software.intel.com/en-us/forums/intel-graphics-performance-analyzers/

Thanks!

Neal ]]></description>
      <link>http://software.intel.com/en-us/articles/intel-gpa-tip-cannot-sychronize-cpu-timestamps/#comment-69642</link>
      <pubDate>Tue, 24 Jan 2012 07:08:01 -0800</pubDate>
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