Public bug reported:
On one of my PCs perf stat stopped working. On another the -d switch doesn't
make much difference.
For Intel(R) Core(TM) i5-10400 CPU @ 2.90GHz (cpuinfo) 'perf stat ls', 'perf
stat -d ls', 'perf stat -d -d ls', 'perf stat -d -d -d ls' print the same error:
Error:
No supported events found.
??
However for 'perf stat -e cycles ls' the output is
Performance couter stats for 'ls':
6,557,256 cycles
0.002429424 seconds time elapsed
0.002426000 seconds user
0.000000000 seconds sys
For perf -d -d -d -p it used to give (kernel 6.19, 6.17):
Performance counter stats for process id '21020':
89,013,725,950 task-clock # 1.019 CPUs
utilized
164,370 context-switches # 1.847 K/sec
964 cpu-migrations # 10.830 /sec
132 page-faults # 1.483 /sec
702,190,440,392 instructions # 2.00 insn per
cycle (38.50%)
351,059,449,841 cycles # 3.944 GHz
(38.52%)
127,592,277,452 branches # 1.433 G/sec
(38.50%)
1,276,835,496 branch-misses # 1.00% of all
branches (38.51%)
196,325,279,137 L1-dcache-loads # 2.206 G/sec
(38.48%)
15,842,212,125 L1-dcache-load-misses # 8.07% of all
L1-dcache accesses (30.76%)
5,213,263,291 LLC-loads # 58.567 M/sec
(30.77%)
90,090,352 LLC-load-misses # 1.73% of all
LL-cache accesses (30.72%)
1,677,044,351 L1-icache-load-misses
(30.73%)
196,328,420,757 dTLB-loads # 2.206 G/sec
(30.73%)
272,990,900 dTLB-load-misses # 0.14% of all
dTLB cache accesses (30.73%)
4,901,254 iTLB-loads # 55.062 K/sec
(30.76%)
24,079,359 iTLB-load-misses # 491.29% of all
iTLB cache accesses (30.80%)
87.358273505 seconds time elapsed
Running perf stat -v ls prints:
Using CPUID GenuineIntel-6-A5-3
Control descriptor not initialized
Error:
No supported events found.
??
On another PC (11th Gen Intel(R) Core(TM) i5-1135G7 @ 2.40GHz = CPUID
GenuineIntel-6-8C-1) no matter now many -d I use (0 to 3) I always get:
Performance counter stats for 'ls':
1 context-switches # 271,3 cs/sec
cs_per_second
0 cpu-migrations # 0,0
migrations/sec migrations_per_second
488 page-faults # 132406,5 faults/sec
page_faults_per_second
3,69 msec task-clock # 0,3 CPUs
CPUs_utilized
25 455 branch-misses # 1,7 %
branch_miss_rate (72,81%)
1 371 012 branches # 372,0 M/sec
branch_frequency (72,95%)
5 309 952 cpu-cycles # 1,4 GHz
cycles_frequency (60,81%)
6 947 321 instructions # 1,3
instructions insn_per_cycle
TopdownL1 # 24,2 %
tma_backend_bound
# 10,4 %
tma_bad_speculation
# 35,6 %
tma_frontend_bound (93,43%)
# 29,8 %
tma_retiring (93,43%)
0,005194625 seconds time elapsed
0,000000000 seconds user
0,005173000 seconds sys
> perf -v
perf version 7.0.0-rc4
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Attachment added: "Version log"
https://bugs.launchpad.net/bugs/2145818/+attachment/5955311/+files/version.log
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/2145818
Title:
perf stat does not work - regression
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2145818/+subscriptions
--
ubuntu-bugs mailing list
[email protected]
https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
