FrozenGene commented on a change in pull request #5492:
URL: https://github.com/apache/incubator-tvm/pull/5492#discussion_r421605666
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File path: src/runtime/threading_backend.cc
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@@ -255,6 +255,17 @@ int MaxConcurrency() {
max_concurrency = std::thread::hardware_concurrency();
#if defined(_M_X64) || defined(__x86_64__)
max_concurrency /= 2; // ignore hyper-threading
+#elif defined(__hexagon__)
+ // With unsigned PDs, getting the number of available hardware threads
+ // is not supported in earlier versions of QuRT. In such cases assume 4.
+ // If running on simulator, set max_concurrency to 1.
+ if (max_concurrency == 0) {
+ if (dlsym(RTLD_DEFAULT, "running_in_sim_dev_17bc90206f6cf5a7")) {
+ max_concurrency = 1;
+ } else {
+ max_concurrency = 4;
Review comment:
Could we use `std::thread::hardware_concurrency();` here instead of `4`?
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