[llvm] 36a4f10 - Fix computeHostNumPhysicalCores() for Linux on POWER and Linux on Z
Ettore Tiotto via llvm-commits
llvm-commits at lists.llvm.org
Thu Jul 30 11:06:06 PDT 2020
Author: Ettore Tiotto
Date: 2020-07-30T18:05:36Z
New Revision: 36a4f1037628683f2a10c0f3a84904f0463432ff
URL: https://github.com/llvm/llvm-project/commit/36a4f1037628683f2a10c0f3a84904f0463432ff
DIFF: https://github.com/llvm/llvm-project/commit/36a4f1037628683f2a10c0f3a84904f0463432ff.diff
LOG: Fix computeHostNumPhysicalCores() for Linux on POWER and Linux on Z
ThinLTO is run using a single thread on Linux on Power. The
compute_thread_count() routine calls getHostNumPhysicalCores which
returns -1 by default, and so `MaxThreadCount is set to 1.
unsigned llvm::ThreadPoolStrategy::compute_thread_count() const {
int MaxThreadCount = UseHyperThreads
? computeHostNumHardwareThreads()
: sys::getHostNumPhysicalCores();
if (MaxThreadCount <= 0)
MaxThreadCount = 1;
…
}
Fix: provide custom implementation of getHostNumPhysicalCores for
Linux on Power and Linux on Z.
Reviewed By: Kai, uweigand
Differential Revision: https://reviews.llvm.org/D84764
Added:
Modified:
llvm/lib/Support/Host.cpp
llvm/unittests/Support/Host.cpp
Removed:
################################################################################
diff --git a/llvm/lib/Support/Host.cpp b/llvm/lib/Support/Host.cpp
index 658c1ee74cfe..01ede62c755a 100644
--- a/llvm/lib/Support/Host.cpp
+++ b/llvm/lib/Support/Host.cpp
@@ -1271,6 +1271,12 @@ int computeHostNumPhysicalCores() {
}
return CPU_COUNT(&Enabled);
}
+#elif (defined(__linux__) && \
+ (defined(__ppc__) || defined(__powerpc__) || defined(__s390x__)))
+#include <unistd.h>
+
+// Gets the number of *physical cores* on the machine.
+int computeHostNumPhysicalCores() { return sysconf(_SC_NPROCESSORS_ONLN); }
#elif defined(__APPLE__) && defined(__x86_64__)
#include <sys/param.h>
#include <sys/sysctl.h>
diff --git a/llvm/unittests/Support/Host.cpp b/llvm/unittests/Support/Host.cpp
index 7d43366631c5..41c7227dd94e 100644
--- a/llvm/unittests/Support/Host.cpp
+++ b/llvm/unittests/Support/Host.cpp
@@ -40,7 +40,9 @@ class HostTest : public testing::Test {
// x86_64 Linux and Darwin.
return (Host.isOSWindows() && llvm_is_multithreaded()) ||
(Host.isX86() &&
- (Host.isOSDarwin() || Host.getOS() == Triple::Linux));
+ (Host.isOSDarwin() || Host.getOS() == Triple::Linux)) ||
+ (Host.getOS() == Triple::Linux &&
+ (Host.isPPC64() || Host.isSystemZ()));
}
HostTest() : Host(Triple::normalize(sys::getProcessTriple())) {}
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