[ARROW-17281] [C++] Windows reports aggregated L-Cache sizes

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 9.0.0
• Fix Version/s: 10.0.0
• Component/s: C++
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/32560
• Assignee: Yibo Cai
• Reporter: Jacob Wujciak
• Created: 02/Aug/22 09:48
• Updated: 11/Jan/23 11:49
• Resolved: 09/Aug/22 06:05

Description

On Windows 10 Version 10.0.19044 Build 19044 CpuInfo::CacheLevel over reports the L-cache size:
640K for L1
10M for L2
These values are also reported by Windows resource monitor.
It seems that windows is reporting the total size of cache for each core aggregated as one value. Possibly due to "intel smart cache" cache sharing?

[----------] 1 test from CpuInfo
[ RUN      ] CpuInfo.Basic
C:/tmp/arrow-verify-release/apache-arrow-9.0.0/cpp/src/arrow/util/io_util_test.cc(1036): error: Value of: l1 >= 4 * 1024 && l1 <= 512 * 1024
  Actual: false
Expected: true
unexpected L1 size: 655360
[  FAILED  ] CpuInfo.Basic (0 ms)
[----------] 1 test from CpuInfo (0 ms total)

Issue Links

• links to: GitHub Pull Request #13813