[issue36670] regrtest: win_utils decodes typeperf output from the wrong encoding (test suite broken due to cpu usage feature on win 10/ german)

[STINNER Victor]

STINNER Victor  added the comment:


New changeset b894b669c98cc365b84cbb8d20f531f1d0686f59 by Victor Stinner in 
branch '3.7':
Update libregrtest from master (GH-19517)
https://github.com/python/cpython/commit/b894b669c98cc365b84cbb8d20f531f1d0686f59


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[issue36670] regrtest: win_utils decodes typeperf output from the wrong encoding (test suite broken due to cpu usage feature on win 10/ german)

[miss-islington]

miss-islington  added the comment:


New changeset f9016e5fc9424d41c8e53de84f8699e78769a14a by Miss Islington (bot) 
in branch '3.7':
[3.8] bpo-36670, regrtest: Fix WindowsLoadTracker() for partial line (GH-16550) 
(GH-16560)
https://github.com/python/cpython/commit/f9016e5fc9424d41c8e53de84f8699e78769a14a


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[issue36670] regrtest: win_utils decodes typeperf output from the wrong encoding (test suite broken due to cpu usage feature on win 10/ german)

[STINNER Victor]

STINNER Victor  added the comment:

Thanks for the bug report. I was impacted by the bug with my French locale as 
well.

I pushed a fix based on Lorenz Mende's work, with minor changes. I also 
enhanced WindowsLoadTracker to handle partial write and report parsing errors 
as warnings rather than exception.

I pushed other changes to enhance regrtest in general.

The load average is not updated every second and it's value is initialized from 
the arithmetic mean of the first 5 values of the Processor Queue Length.

--
resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed

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[issue36670] regrtest: win_utils decodes typeperf output from the wrong encoding (test suite broken due to cpu usage feature on win 10/ german)

[miss-islington]

Change by miss-islington :


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[issue36670] regrtest: win_utils decodes typeperf output from the wrong encoding (test suite broken due to cpu usage feature on win 10/ german)

[STINNER Victor]

STINNER Victor  added the comment:


New changeset de3195c937d5fca0d79cc93dbafa76c0f89ca5b8 by Victor Stinner in 
branch '3.8':
[3.8] bpo-36670, regrtest: Fix WindowsLoadTracker() for partial line (GH-16550) 
(GH-16560)
https://github.com/python/cpython/commit/de3195c937d5fca0d79cc93dbafa76c0f89ca5b8


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[issue36670] regrtest: win_utils decodes typeperf output from the wrong encoding (test suite broken due to cpu usage feature on win 10/ german)

[STINNER Victor]

Change by STINNER Victor :


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[issue36670] regrtest: win_utils decodes typeperf output from the wrong encoding (test suite broken due to cpu usage feature on win 10/ german)

[STINNER Victor]

Change by STINNER Victor :


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[issue36670] regrtest: win_utils decodes typeperf output from the wrong encoding (test suite broken due to cpu usage feature on win 10/ german)

[STINNER Victor]

STINNER Victor  added the comment:


New changeset 098e25672f1c3578855d5ded4f5147795c9ed956 by Victor Stinner in 
branch 'master':
bpo-36670: Enhance regrtest (GH-16556)
https://github.com/python/cpython/commit/098e25672f1c3578855d5ded4f5147795c9ed956


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[issue36670] regrtest: win_utils decodes typeperf output from the wrong encoding (test suite broken due to cpu usage feature on win 10/ german)

[STINNER Victor]

Change by STINNER Victor :


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[issue36670] regrtest: win_utils decodes typeperf output from the wrong encoding (test suite broken due to cpu usage feature on win 10/ german)

[STINNER Victor]

Change by STINNER Victor :


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[issue36670] regrtest: win_utils decodes typeperf output from the wrong encoding (test suite broken due to cpu usage feature on win 10/ german)

[STINNER Victor]

Change by STINNER Victor :


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[issue36670] regrtest: win_utils decodes typeperf output from the wrong encoding (test suite broken due to cpu usage feature on win 10/ german)

[STINNER Victor]

STINNER Victor  added the comment:


New changeset c65119d5bfded03f80a9805889391b66fa7bf551 by Victor Stinner in 
branch 'master':
bpo-36670: Enhance regrtest WindowsLoadTracker (GH-16553)
https://github.com/python/cpython/commit/c65119d5bfded03f80a9805889391b66fa7bf551


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[issue36670] regrtest: win_utils decodes typeperf output from the wrong encoding (test suite broken due to cpu usage feature on win 10/ german)

[STINNER Victor]

Change by STINNER Victor :


--
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stage: resolved -> patch review
pull_request: https://github.com/python/cpython/pull/16553

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[issue36670] regrtest: win_utils decodes typeperf output from the wrong encoding (test suite broken due to cpu usage feature on win 10/ german)

[STINNER Victor]

STINNER Victor  added the comment:


New changeset 3e04cd268ee9a57f95dc78d8974b21a6fac3f666 by Victor Stinner in 
branch 'master':
bpo-36670, regrtest: Fix WindowsLoadTracker() for partial line (GH-16550)
https://github.com/python/cpython/commit/3e04cd268ee9a57f95dc78d8974b21a6fac3f666


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[issue36670] regrtest: win_utils decodes typeperf output from the wrong encoding (test suite broken due to cpu usage feature on win 10/ german)

[STINNER Victor]

STINNER Victor  added the comment:

Ok, I managed to reproduce the bug using this change:

diff --git a/Lib/test/libregrtest/win_utils.py 
b/Lib/test/libregrtest/win_utils.py
index f0c17b906f..78429faa89 100644
--- a/Lib/test/libregrtest/win_utils.py
+++ b/Lib/test/libregrtest/win_utils.py
@@ -14,7 +14,7 @@ BUFSIZE = 8192
 LOAD_FACTOR_1 = 0.9200444146293232478931553241
 
 # Seconds per measurement
-SAMPLING_INTERVAL = 5
+SAMPLING_INTERVAL = 0
 # Windows registry subkey of HKEY_LOCAL_MACHINE where the counter names
 # of typeperf are registered
 COUNTER_REGISTRY_KEY = (r"SOFTWARE\Microsoft\Windows NT\CurrentVersion"


I wrote PR 16550 to handle partial lines.

--
resolution: fixed -> 
status: closed -> open

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[issue36670] regrtest: win_utils decodes typeperf output from the wrong encoding (test suite broken due to cpu usage feature on win 10/ german)

[STINNER Victor]

Change by STINNER Victor :


--
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pull_request: https://github.com/python/cpython/pull/16550

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[issue36670] regrtest: win_utils decodes typeperf output from the wrong encoding (test suite broken due to cpu usage feature on win 10/ german)

[David Bolen]

David Bolen  added the comment:

I've confirmed the partial read with some local modifications, and the failures 
are always split between time stamp and value:

Warning -- Failed to parse typeperf output: '"10/02/2019 17:42:26.229"'
0.0
Warning -- Missing first field: ,"0.00"
0.0

Adding multiple variables to the typeperf command can vary the split position, 
but I've only seen it at a variable boundary (starting with the comma).  So I'm 
guessing with the current implementation the above is probably the only point 
where the I/Os can be interleaved.

Also, CRLF seems to only appear at the start of each read, never at the end.  
You can see that behavior interactively too where the cursor waits at the end 
of the line between samples.  So changes to wait for a complete line to be read 
would also delay load values by one sample interval.

So I'm thinking just reverting to silently ignoring this case is probably 
simplest.

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[issue36670] regrtest: win_utils decodes typeperf output from the wrong encoding (test suite broken due to cpu usage feature on win 10/ german)

[David Bolen]

David Bolen  added the comment:

Oh, I agree it's just a warning, and I suspect few people look into warnings, 
but since it's not from an actual test, I'm not sure the overall build should 
be flagged.

The manual typeperf looks fine, but there's no way I could tell visually how 
the I/O is being done under the covers.  My bet is typeperf is probably issuing 
multiple output calls, one for the leading timestamp and then one for each 
value.  So regrtest just happens to interleave its own read in between the two. 
 The subsequent read would then get the trailing "," which the current code 
would parse normally as it only cares about the second field.  In which case 
it's not even affecting the load monitoring, other than the warning message.

I suspect it's happening on the Windows 10 buildbot as the machine is 
reasonably fast.  But to your earlier comment about things just working 
previously, I'm not sure there's that much value in adding code to deal with 
this case.

I'd probably just remove the warning to restore the earlier behavior.  The 
current code still ignores other issues like an actual read failure in 
read_output.  Or, if there's a way to generate the message without it being 
considered an overall test build warning, that would work too.

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[issue36670] regrtest: win_utils decodes typeperf output from the wrong encoding (test suite broken due to cpu usage feature on win 10/ german)

[STINNER Victor]

STINNER Victor  added the comment:

> Just an FYI that this change is generating warnings on my Windows 10 buildbot 
> with some regularity about a failure to parse testperf output, such as:

Warning -- Failed to parse typeperf output: '"10/01/2019 07:58:50.056"'

Aha, interesting. I added a warning to debug the code.

> Now, clearly there's no queue length in that output so the parsing warning is 
> accurate, but does the overall build have to reflect a warning in such cases, 
> given that it's just a test harness issue, and not anything going wrong with 
> the actual tests?

The build is marked as "warning" (orange) which is different than "fail" (red). 
Warnings are used to detect bugs or interesting issues, but not considered as a 
regression.

> I don't know why both fields aren't present although it seems plausible that 
> it's just a partial line from the I/O (I don't think it guarantees it 
> receives full lines), and the queue length field would appear on the 
> following read.

Right, the code doesn't ensure that a line ends with a newline character. Could 
you try to run manually the following command to check its output?

   typeperf "\System\Processor Queue Length" -si 1

Maybe uncomplete lines should be buffered in read_output().

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[issue36670] regrtest: win_utils decodes typeperf output from the wrong encoding (test suite broken due to cpu usage feature on win 10/ german)

[David Bolen]

David Bolen  added the comment:

Just an FYI that this change is generating warnings on my Windows 10 buildbot 
with some regularity about a failure to parse testperf output, such as:

Warning -- Failed to parse typeperf output: '"10/01/2019 07:58:50.056"'

from https://buildbot.python.org/all/#/builders/217/builds/487

Now, clearly there's no queue length in that output so the parsing warning is 
accurate, but does the overall build have to reflect a warning in such cases, 
given that it's just a test harness issue, and not anything going wrong with 
the actual tests?  Previously any such cases would be ignored silently, so this 
probably isn't a new issue but just one that is now shows up as an overall 
build warning.

I don't know why both fields aren't present although it seems plausible that 
it's just a partial line from the I/O (I don't think it guarantees it receives 
full lines), and the queue length field would appear on the following read.

--
nosy: +db3l

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[issue36670] regrtest: win_utils decodes typeperf output from the wrong encoding (test suite broken due to cpu usage feature on win 10/ german)

[miss-islington]

miss-islington  added the comment:


New changeset a72de9338882b8013a4bb8adb930fe3308682e28 by Miss Islington (bot) 
in branch '3.8':
bpo-36670: regrtest bug fixes (GH-16537)
https://github.com/python/cpython/commit/a72de9338882b8013a4bb8adb930fe3308682e28


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[issue36670] regrtest: win_utils decodes typeperf output from the wrong encoding (test suite broken due to cpu usage feature on win 10/ german)

[miss-islington]

Change by miss-islington :


--
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pull_request: https://github.com/python/cpython/pull/16538

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[issue36670] regrtest: win_utils decodes typeperf output from the wrong encoding (test suite broken due to cpu usage feature on win 10/ german)

[STINNER Victor]

STINNER Victor  added the comment:


New changeset 2ea71a07d0a720707094ee55f78fd232c40724bc by Victor Stinner in 
branch 'master':
bpo-36670: regrtest bug fixes (GH-16537)
https://github.com/python/cpython/commit/2ea71a07d0a720707094ee55f78fd232c40724bc


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[issue36670] regrtest: win_utils decodes typeperf output from the wrong encoding (test suite broken due to cpu usage feature on win 10/ german)

[STINNER Victor]

Change by STINNER Victor :


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pull_request: https://github.com/python/cpython/pull/16537

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[issue36670] regrtest: win_utils decodes typeperf output from the wrong encoding (test suite broken due to cpu usage feature on win 10/ german)

[STINNER Victor]

Change by STINNER Victor :


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[issue36670] regrtest: win_utils decodes typeperf output from the wrong encoding (test suite broken due to cpu usage feature on win 10/ german)

[STINNER Victor]

STINNER Victor  added the comment:

> We could avoid typeperf command by accessing directly performance counters: 
> (...)

Honestly, it sounds very complicated. I don't think that it's worth it. With 
Lorenz's fix, regrtest now "just works". So I think that it's good enough.

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[issue36670] regrtest: win_utils decodes typeperf output from the wrong encoding (test suite broken due to cpu usage feature on win 10/ german)

[miss-islington]

miss-islington  added the comment:


New changeset d6a92b55944bf1ef4992e4375f02a7132717bf53 by Miss Islington (bot) 
in branch '3.7':
bpo-36670: Multiple regrtest bugfixes (GH-16511)
https://github.com/python/cpython/commit/d6a92b55944bf1ef4992e4375f02a7132717bf53


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[issue36670] regrtest: win_utils decodes typeperf output from the wrong encoding (test suite broken due to cpu usage feature on win 10/ german)

[STINNER Victor]

STINNER Victor  added the comment:

Thanks Lorenz Mende for the nice bug report, investigating the issue and 
proposing fix. I wrote a PR based on your work with some minor changes. I 
included it in a large regrtest change to fix other bugs.

regrtest should work again with locales other than English.

--
resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed

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[issue36670] regrtest: win_utils decodes typeperf output from the wrong encoding (test suite broken due to cpu usage feature on win 10/ german)

[miss-islington]

miss-islington  added the comment:


New changeset 6b4c70abcaa348c84a2c1bb6f5a46596cf358e36 by Miss Islington (bot) 
in branch '3.8':
bpo-36670: Multiple regrtest bugfixes (GH-16511)
https://github.com/python/cpython/commit/6b4c70abcaa348c84a2c1bb6f5a46596cf358e36


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[issue36670] regrtest: win_utils decodes typeperf output from the wrong encoding (test suite broken due to cpu usage feature on win 10/ german)

[miss-islington]

Change by miss-islington :


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pull_request: https://github.com/python/cpython/pull/16514

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[issue36670] regrtest: win_utils decodes typeperf output from the wrong encoding (test suite broken due to cpu usage feature on win 10/ german)

[miss-islington]

Change by miss-islington :


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pull_request: https://github.com/python/cpython/pull/16513

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[issue36670] regrtest: win_utils decodes typeperf output from the wrong encoding (test suite broken due to cpu usage feature on win 10/ german)

[STINNER Victor]

STINNER Victor  added the comment:


New changeset 982bfa4da07b2e5749a0f4e68f99e972bcc3a549 by Victor Stinner in 
branch 'master':
bpo-36670: Multiple regrtest bugfixes (GH-16511)
https://github.com/python/cpython/commit/982bfa4da07b2e5749a0f4e68f99e972bcc3a549


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[issue36670] regrtest: win_utils decodes typeperf output from the wrong encoding (test suite broken due to cpu usage feature on win 10/ german)

[STINNER Victor]

Change by STINNER Victor :


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[issue36670] regrtest: win_utils decodes typeperf output from the wrong encoding (test suite broken due to cpu usage feature on win 10/ german)

[STINNER Victor]

STINNER Victor  added the comment:

We could avoid typeperf command by accessing directly performance counters:

(1) The Performance Data Helper (PDH) interface, which provides high-level 
access to data from both version 1 and version 2 performance counter providers.
(2) The registry interface, which provides low-level access to data from 
performance counter providers.
(3) The performance library interface, which provides direct access to data 
from version 2 performance counter providers.

https://docs.microsoft.com/en-us/windows/win32/perfctrs/consuming-counter-data

(2) in short: RegQueryValueEx() with HKEY_PERFORMANCE_DATA and the 
PPERF_DATA_BLOCK structure

Documentation:
https://docs.microsoft.com/en-us/windows/win32/perfctrs/using-the-registry-functions-to-consume-counter-data

PERF_DATA_BLOCK structure fields:
https://docs.microsoft.com/en-us/windows/win32/api/winperf/ns-winperf-perf_data_block

Example: 
https://docs.microsoft.com/en-us/windows/win32/api/winreg/nf-winreg-regqueryvalueexw

Some examples mention "RegQueryValueEx function. Use HKEY_PERFORMANCE_DATA".

Performance Data Format:
https://docs.microsoft.com/en-us/windows/win32/perfctrs/performance-data-format

--

PDH & friends was discussed in bpo-34060 which added the feature to libregrtest.

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[issue36670] regrtest: win_utils decodes typeperf output from the wrong encoding (test suite broken due to cpu usage feature on win 10/ german)

[STINNER Victor]

STINNER Victor  added the comment:

I tested attached win_utils.py on my Windows 10. I uses the command:

['typeperf', '"\\Système\\Longueur de la file du processeur"', '-si', '5']

Oh wait, counter names are now translated? Oh ok.

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[issue36670] regrtest: win_utils decodes typeperf output from the wrong encoding (test suite broken due to cpu usage feature on win 10/ german)

[STINNER Victor]

STINNER Victor  added the comment:

On my Windows 10 version 1903, I get:

C:\> typeperf "\System\Processor Queue Length" -si 1
Fin du programme, veuillez patienter...
Erreur : aucun compteur valide.

C:\> echo %errorlevel%
-268435454

Error message in english: "Error: No valid counters"

Because of this error, regrtest fails with:

...
  File "C:\vstinner\python\master\lib\test\libregrtest\win_utils.py", line 85, 
in getloadavg
typeperf_output = self.read_output()
  File "C:\vstinner\python\master\lib\test\libregrtest\win_utils.py", line 82, 
in read_output
return overlapped.getbuffer().decode()
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xff in position 74: 
invalid start byte


I'm using:

platform.architecture: 64bit WindowsPE
platform.platform: Windows-10-10.0.18362-SP0
sys.windowsversion: sys.getwindowsversion(major=10, minor=0, build=18362, 
platform=2, service_pack='')

Note: same error when testing as an administrator. It's not a permission issue.

--

On the other side, "wmic cpu get loadpercentage" works as expected:

C:\> wmic cpu get loadpercentage
LoadPercentage
1
1

--

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[issue36670] regrtest: win_utils decodes typeperf output from the wrong encoding (test suite broken due to cpu usage feature on win 10/ german)

[Lorenz Mende]

Change by Lorenz Mende :


--
pull_requests: +16036
pull_request: https://github.com/python/cpython/pull/16456

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[issue36670] regrtest: win_utils decodes typeperf output from the wrong encoding (test suite broken due to cpu usage feature on win 10/ german)

[Lorenz Mende]

Change by Lorenz Mende :


--
keywords: +patch
pull_requests: +15175
stage: needs patch -> patch review
pull_request: https://github.com/python/cpython/pull/15488

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[issue36670] regrtest: win_utils decodes typeperf output from the wrong encoding (test suite broken due to cpu usage feature on win 10/ german)

[STINNER Victor]

Change by STINNER Victor :


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title: test suite broken due to cpu usage feature on win 10/ german -> 
regrtest: win_utils decodes typeperf output from the wrong encoding (test suite 
broken due to cpu usage feature on win 10/ german)

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