src/share/vm/runtime/advancedThresholdPolicy.cpp

*** 40,60 ****
                                 threshold_scale(CompLevel_full_optimization, Tier4LoadFeedback));
  
  }
  
  void AdvancedThresholdPolicy::initialize() {
    // Turn on ergonomic compiler count selection
    if (FLAG_IS_DEFAULT(CICompilerCountPerCPU) && FLAG_IS_DEFAULT(CICompilerCount)) {
      FLAG_SET_DEFAULT(CICompilerCountPerCPU, true);
    }
-   int count = CICompilerCount;
    if (CICompilerCountPerCPU) {
      // Simple log n seems to grow too slowly for tiered, try something faster: log n * log log n
      int log_cpu = log2_intptr(os::active_processor_count());
      int loglog_cpu = log2_intptr(MAX2(log_cpu, 1));
      count = MAX2(log_cpu * loglog_cpu, 1) * 3 / 2;
    }
  
    set_c1_count(MAX2(count / 3, 1));
    set_c2_count(MAX2(count - c1_count(), 1));
    FLAG_SET_ERGO(intx, CICompilerCount, c1_count() + c2_count());
  
--- 40,73 ----
                                 threshold_scale(CompLevel_full_optimization, Tier4LoadFeedback));
  
  }
  
  void AdvancedThresholdPolicy::initialize() {
+   int count = CICompilerCount;
+ #ifdef _LP64
    // Turn on ergonomic compiler count selection
    if (FLAG_IS_DEFAULT(CICompilerCountPerCPU) && FLAG_IS_DEFAULT(CICompilerCount)) {
      FLAG_SET_DEFAULT(CICompilerCountPerCPU, true);
    }
    if (CICompilerCountPerCPU) {
      // Simple log n seems to grow too slowly for tiered, try something faster: log n * log log n
      int log_cpu = log2_intptr(os::active_processor_count());
      int loglog_cpu = log2_intptr(MAX2(log_cpu, 1));
      count = MAX2(log_cpu * loglog_cpu, 1) * 3 / 2;
    }
+ #else
+   // On 32-bit systems, the number of compiler threads is limited to 3.
+   // On these systems, the virtual address space available to the JVM
+   // is usually limited to 2-4 GB (the exact value depends on the platform).
+   // As the compilers (especially C2) can consume a large amount of
+   // memory, scaling the number of compiler threads with the number of
+   // available cores can result in the exhaustion of the address space
+   /// available to the VM and thus cause the VM to crash.
+   if (FLAG_IS_DEFAULT(CICompilerCount)) {
+     count = 3;
+   }
+ #endif
  
    set_c1_count(MAX2(count / 3, 1));
    set_c2_count(MAX2(count - c1_count(), 1));
    FLAG_SET_ERGO(intx, CICompilerCount, c1_count() + c2_count());