I was interested to try rr in a PD virtual machine. rr is record-replay tool debugging tool, which relies on CPU "performance counters" for its work.
Luckily, Parallels seems to support this with "Configure -> Hardware -> CPU & Memory -> Enable PMU virtualization".
However, when I tried this on Ubuntu 14.04 it doesn't seem to work (see below [1]).
My questions are:
- Am I right that "Broken PMU hardware detected" means the PMU virtualization didn't work with the guest I'm using?
- Is there a known good guest that works for someone else? I'm guessing success might depend on the guest...
- Any other debugging tips or links? There's virtually zero information on this feature that I can find.
Parallels Desktop 10.2.1, OS X 10.9.5, late 2013 retina 15-inch MacBook Pro.
Linux ubuntu 3.13.0-58-generic #97-Ubuntu SMP Wed Jul 8 02:56:15 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
[1]
dmesg has this:
[ 1.252008] smpboot: CPU0: Intel(R) Core(TM) i7-4850HQ CPU @ 2.30GHz (fam: 06, model: 46, stepping: 01)
[ 1.360353] Performance Events: PEBS fmt2+, 16-deep LBR, Haswell events, full-width counters, Broken PMU hardware detected, using software events only.
[ 1.363856] Failed to access perfctr msr (MSR 4c1 is 0)
[ 1.427860] NMI watchdog: disabled (cpu0): hardware events not enabled
If I try 'perf stat', it reports this:
Performance counter stats for 'yes':
141.697409 task-clock (msec) # 0.278 CPUs utilized
174,445 context-switches # 1.231 M/sec
0 cpu-migrations # 0.000 K/sec
172 page-faults # 0.001 M/sec
<not supported> cycles
<not supported> stalled-cycles-frontend
<not supported> stalled-cycles-backend
<not supported> instructions
<not supported> branches
<not supported> branch-misses
