Message 353556 - Python tracker

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Author	vstinner
Recipients	LorenzMende, ammar2, eryksun, heckad, paul.moore, skoslowski, steve.dower, tim.golden, vstinner, zach.ware
Date	2019-09-30.08:56:15
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1569833775.66.0.0569298657094.issue36670@roundup.psfhosted.org>
In-reply-to

Content
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.

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.

History
Date	User	Action	Args
2019-09-30 08:56:15	vstinner	set	recipients: + vstinner, paul.moore, tim.golden, zach.ware, eryksun, steve.dower, ammar2, LorenzMende, skoslowski, heckad
2019-09-30 08:56:15	vstinner	set	messageid: <1569833775.66.0.0569298657094.issue36670@roundup.psfhosted.org>
2019-09-30 08:56:15	vstinner	link	issue36670 messages
2019-09-30 08:56:15	vstinner	create