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<base href="http://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Test failing because cycleFrequency unable to determine CPU frequency for TSC accounting"
href="http://bugs.llvm.org/show_bug.cgi?id=32620">32620</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Test failing because cycleFrequency unable to determine CPU frequency for TSC accounting
</td>
</tr>
<tr>
<th>Product</th>
<td>XRay
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Runtime
</td>
</tr>
<tr>
<th>Assignee</th>
<td>dberris@google.com
</td>
</tr>
<tr>
<th>Reporter</th>
<td>douglas_yung@playstation.sony.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>On my machine, an x86_64 Linux VM that does not expose support for rdtscp, the
timestamp emulation is unable to determine the CPU frequency causing the test "
XRay-x86_64-linux :: TestCases/Linux/fdr-mode.cc" to fail.
When trying to run the xray instrumented binary, here is the output generated:
Command: XRAY_OPTIONS="patch_premain=false xray_naive_log=false
xray_logfile_base=fdr-logging-test- xray_fdr_log=true verbosity=1
xray_fdr_log_func_duration_threshold_us=0"
/home/dyung/src/git/merge/build/projects/compiler-rt/test/xray/X86_64LinuxConfig/TestCases/Linux/Output/fdr-mode.cc.tmp
Output:
==32513==Missing rdtscp support.
==32513==WARNING: Required CPU features missing for XRay instrumentation, using
emulation instead.
Logging before init.
==32513==XRay FDR init successful.
Init status 2
Patching...
==32513==Missing rdtscp support.
==32513==Unable to determine CPU frequency for TSC accounting.
==32513==Missing rdtscp support.
==32513==Missing rdtscp support.
==32513==Missing rdtscp support.
==32513==Missing rdtscp support.
==32513==Missing rdtscp support.
==32513==Missing rdtscp support.
==32513==Missing rdtscp support.
==32513==Missing rdtscp support.
==32513==Missing rdtscp support.
==32513==Missing rdtscp support.
==32513==Missing rdtscp support.
==32513==Missing rdtscp support.
==32513==Missing rdtscp support.
==32513==Missing rdtscp support.
==32513==Missing rdtscp support.
==32513==Missing rdtscp support.
==32513==Missing rdtscp support.
==32513==Missing rdtscp support.
==32513==Missing rdtscp support.
==32513==Missing rdtscp support.
==32513==Unable to determine CPU frequency for TSC accounting.
==32513==Missing rdtscp support.
==32513==Missing rdtscp support.
==32513==Missing rdtscp support.
==32513==Missing rdtscp support.
==32513==Missing rdtscp support.
==32513==Missing rdtscp support.
==32513==Missing rdtscp support.
==32513==Missing rdtscp support.
==32513==Missing rdtscp support.
==32513==Missing rdtscp support.
==32513==Missing rdtscp support.
Joined
Finalize status 4
==32513==Missing rdtscp support.
==32513==Missing rdtscp support.
Main execution var = 6
==32513==XRay: Log file in 'fdr-logging-test-fdr-mode.cc.tmp.njhGht'
==32513==Unable to determine CPU frequency for TSC accounting.
Flush status 2
Then when the resulting file is run through llvm-xray:
Command: /home/dyung/src/git/merge/build/./bin/llvm-xray convert --symbolize
--output-format=yaml
-instr_map=/home/dyung/src/git/merge/build/projects/compiler-rt/test/xray/X86_64LinuxConfig/TestCases/Linux/Output/fdr-mode.cc.tmp
"`ls fdr-unwrite-test-* | head -1`"
Output:
header:
version: 1
type: 1
constant-tsc: true
nonstop-tsc: true
cycle-frequency: 0
records:
- { type: 0, func-id: 3, function: 'fA()', cpu: 0, thread: 32513, kind:
function-enter, tsc: 1491898914518840766 }
...
On my Linux VM, here is the output of /proc/cpuinfo:
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 60
model name : Intel(R) Core(TM) i7-4790 CPU @ 3.60GHz
stepping : 3
microcode : 0xffffffff
cpu MHz : 3201.432
cache size : 8192 KB
physical id : 0
siblings : 8
core id : 0
cpu cores : 8
apicid : 0
initial apicid : 0
fpu : yes
fpu_exception : yes
cpuid level : 13
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
pat pse36 clflush mmx fxsr sse sse2 ss ht syscall nx lm constant_tsc rep_good
nopl eagerfpu pni pclmulqdq ssse3 fma cx16 sse4_1 sse4_2 movbe popcnt aes xsave
avx f16c rdrand hypervisor lahf_lm abm fsgsbase bmi1 avx2 smep bmi2 erms
xsaveopt
bugs :
bogomips : 6402.86
clflush size : 64
cache_alignment : 64
address sizes : 39 bits physical, 48 bits virtual
power management:
Additionally, neither of the files that cycleFrequency() is looking for to find
the CPU frequency are present on my system.</pre>
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