vvellanki commented on a change in pull request #9833:
URL: https://github.com/apache/arrow/pull/9833#discussion_r608348860
##########
File path:
java/gandiva/src/main/java/org/apache/arrow/gandiva/evaluator/JniLoader.java
##########
@@ -35,7 +37,8 @@
private static volatile JniLoader INSTANCE;
private static volatile long defaultConfiguration = 0L;
- private static volatile long unoptimizedConfiguration = 0L;
+ private static final ConcurrentMap<ConfigurationBuilder.ConfigOptions, Long>
configurationMap
Review comment:
Do we have tests to ensure that this map works as expected?
Using the same Config should return the same long. Release should work as
expected, etc.
##########
File path: cpp/src/gandiva/engine.cc
##########
@@ -133,13 +132,17 @@ Status Engine::Make(const std::shared_ptr<Configuration>&
conf,
// ExecutionEngine but only for the lifetime of the builder. Found by
// inspecting LLVM sources.
std::string builder_error;
- std::unique_ptr<llvm::ExecutionEngine> exec_engine{
- llvm::EngineBuilder(std::move(module))
- .setMCPU(llvm::sys::getHostCPUName())
- .setEngineKind(llvm::EngineKind::JIT)
- .setOptLevel(opt_level)
- .setErrorStr(&builder_error)
- .create()};
+
+ llvm::EngineBuilder engine_builder(std::move(module));
+
+ engine_builder.setEngineKind(llvm::EngineKind::JIT)
+ .setOptLevel(opt_level)
+ .setErrorStr(&builder_error);
+
+ if (conf->target_host_cpu()) {
+ engine_builder.setMCPU(llvm::sys::getHostCPUName());
Review comment:
What is the impact of not setting this? Does LLVM generate sub-optimal
code? or does it internally figure out the CPU and generate appropriate code
for that?
##########
File path:
java/gandiva/src/main/java/org/apache/arrow/gandiva/evaluator/JniLoader.java
##########
@@ -35,7 +37,8 @@
private static volatile JniLoader INSTANCE;
private static volatile long defaultConfiguration = 0L;
- private static volatile long unoptimizedConfiguration = 0L;
+ private static final ConcurrentMap<ConfigurationBuilder.ConfigOptions, Long>
configurationMap
Review comment:
I see a releaseConfig in JNI. Dont we need something similar here to
reduce the size of the Map?
##########
File path: cpp/src/gandiva/engine.cc
##########
@@ -133,13 +132,17 @@ Status Engine::Make(const std::shared_ptr<Configuration>&
conf,
// ExecutionEngine but only for the lifetime of the builder. Found by
// inspecting LLVM sources.
std::string builder_error;
- std::unique_ptr<llvm::ExecutionEngine> exec_engine{
- llvm::EngineBuilder(std::move(module))
- .setMCPU(llvm::sys::getHostCPUName())
- .setEngineKind(llvm::EngineKind::JIT)
- .setOptLevel(opt_level)
- .setErrorStr(&builder_error)
- .create()};
+
+ llvm::EngineBuilder engine_builder(std::move(module));
+
+ engine_builder.setEngineKind(llvm::EngineKind::JIT)
+ .setOptLevel(opt_level)
+ .setErrorStr(&builder_error);
+
+ if (conf->target_host_cpu()) {
+ engine_builder.setMCPU(llvm::sys::getHostCPUName());
Review comment:
This change conflicts with the other change as the call to
getHostCPUName() is done once in the other change
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