Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Fix LLC cache issue on Apple M1 #64576

Merged
merged 3 commits into from
Feb 1, 2022
Merged

Fix LLC cache issue on Apple M1 #64576

Changes from 1 commit
Commits
Show all changes
3 commits
Select commit Hold shift + click to select a range
8c84f7e
Better way to get LLC size on Apple M1 (macOS 12.0+)
EgorBo Jan 31, 2022
dde8edb
Address feedback
EgorBo Jan 31, 2022
2168a75
Address feedback
EgorBo Feb 1, 2022
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
9 changes: 8 additions & 1 deletion src/coreclr/pal/src/misc/sysinfo.cpp
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -613,9 +613,16 @@ PAL_GetLogicalProcessorCacheSizeFromOS()
{
int64_t cacheSizeFromSysctl = 0;
size_t sz = sizeof(cacheSizeFromSysctl);
const bool success = sysctlbyname("hw.l3cachesize", &cacheSizeFromSysctl, &sz, nullptr, 0) == 0
const bool success = false
EgorBo marked this conversation as resolved.
Show resolved Hide resolved
// macOS-arm64: Since macOS 12.0, Apple added ".perflevelX." to determinate cache sizes for efficiency
// and performance cores separetely. "perflevel0" stands for "performance"
EgorBo marked this conversation as resolved.
Show resolved Hide resolved
|| sysctlbyname("hw.perflevel0.l3cachesize", &cacheSizeFromSysctl, &sz, nullptr, 0) == 0
|| sysctlbyname("hw.perflevel0.l2cachesize", &cacheSizeFromSysctl, &sz, nullptr, 0) == 0
// macOS-arm64: these report cache sizes for efficiency cores only
|| sysctlbyname("hw.l3cachesize", &cacheSizeFromSysctl, &sz, nullptr, 0) == 0
|| sysctlbyname("hw.l2cachesize", &cacheSizeFromSysctl, &sz, nullptr, 0) == 0
|| sysctlbyname("hw.l1dcachesize", &cacheSizeFromSysctl, &sz, nullptr, 0) == 0;

if (success)
{
_ASSERTE(cacheSizeFromSysctl > 0);
Expand Down