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Change default thread pool sizes to respect processor affinity (#6604)

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Instead of using the number of processors in the host, use the number of
processors available to the process, respecting cpu affinity
assignments. Without pthreads, fall back and use the number of
processors in the host as before.

This is now applied everywhere so runing `nuamctl -C 0-3 verilator` or
`numactl -C 0-3 Vsim` should behave as if the host has 4 cores (e.g.
like in CI jobs)
This commit is contained in:
Geza Lore
2025-10-28 18:10:40 +00:00
committed by GitHub
parent 5642de432b
commit ffbb3229a8
12 changed files with 72 additions and 45 deletions
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include/verilated.cpp
+5 -5
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@@ -2807,11 +2807,11 @@ void VerilatedContext::threads(unsigned n) {
if (m_threads == n) return; // To avoid unnecessary warnings
m_threads = n;
const unsigned hardwareThreadsAvailable = std::thread::hardware_concurrency();
if (m_threads > hardwareThreadsAvailable) {
VL_PRINTF_MT("%%Warning: System has %u hardware threads but simulation thread count set "
"to %u. This will likely cause significant slowdown.\n",
hardwareThreadsAvailable, m_threads);
const unsigned threadsAvailableToProcess = VlOs::getProcessDefaultParallelism();
if (m_threads > threadsAvailableToProcess) {
VL_PRINTF_MT("%%Warning: Process has %u hardware threads available, but simulation thread "
"count set to %u. This will likely cause significant slowdown.\n",
threadsAvailableToProcess, m_threads);
}
}