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[AIX] Raise soft memory limits to hard limits #167928

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Merged
merged 2 commits into from
Nov 17, 2025
Merged

[AIX] Raise soft memory limits to hard limits #167928

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[AIX] Raise soft memory limits to hard limits
daltenty Nov 7, 2025
6234b76
clang-format
daltenty Nov 13, 2025
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29 changes: 29 additions & 0 deletions llvm/lib/Support/InitLLVM.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -32,6 +32,34 @@
#endif
#endif

static void RaiseLimits() {
#ifdef _AIX
// AIX has restrictive memory soft-limits out-of-box, so raise them if needed.
auto RaiseLimit = [](int resource) {
struct rlimit r;
getrlimit(resource, &r);

// Increase the soft limit to the hard limit, if necessary and
// possible.
if (r.rlim_cur != RLIM_INFINITY && r.rlim_cur != r.rlim_max) {
r.rlim_cur = r.rlim_max;
setrlimit(resource, &r);
}
};

// Address space size.
RaiseLimit(RLIMIT_AS);
// Heap size.
RaiseLimit(RLIMIT_DATA);
// Stack size.
RaiseLimit(RLIMIT_STACK);
#ifdef RLIMIT_RSS
// Resident set size.
RaiseLimit(RLIMIT_RSS);
#endif
#endif
}

void CleanupStdHandles(void *Cookie) {
llvm::raw_ostream *Outs = &llvm::outs(), *Errs = &llvm::errs();
Outs->flush();
Expand Down Expand Up @@ -67,6 +95,7 @@ InitLLVM::InitLLVM(int &Argc, const char **&Argv,
StackPrinter.emplace(Argc, Argv);
sys::PrintStackTraceOnErrorSignal(Argv[0]);
install_out_of_memory_new_handler();
RaiseLimits();

#ifdef __MVS__

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