[ET-VK] Print op breakdown with tab separator

Pull Request resolved: #7740

Use boolean flag to switch between nicely-formatted space separator and spreadsheet-ready tab operator. Motiviation is similar to #7035 in facilitating copy-paste of results to a gsheet.
ghstack-source-id: 261985673

Differential Revision: [D68345444](https://our.internmc.facebook.com/intern/diff/D68345444/)

backends/vulkan/runtime/vk_api/QueryPool.cpp

@@ -233,9 +233,45 @@ std::string QueryPool::generate_string_report() {
   return ss.str();
 }
 
-void QueryPool::print_results() {
+
+std::string QueryPool::generate_tsv_string_report() {
+  std::lock_guard<std::mutex> lock(mutex_);
+
+  std::stringstream ss;
+
+  ss << "Kernel Name\t";
+  ss << "Global Workgroup Size\t";
+  ss << "Local Workgroup Size\t";
+  ss << "Duration (ns)\t";
+  ss << std::endl;
+
+  ss << "===========\t";
+  ss << "=====================\t";
+  ss << "====================\t";
+  ss << "=============\t";
+  ss << std::endl;
+
+  for (ShaderDuration& entry : shader_durations_) {
+    std::chrono::duration<size_t, std::nano> exec_duration_ns(
+        entry.execution_duration_ns);
+
+    ss << entry.kernel_name << "\t";
+    ss << stringize(entry.global_workgroup_size) << "\t";
+    ss << stringize(entry.local_workgroup_size) << "\t";
+    ss << exec_duration_ns.count() << "\t";
+    ss << std::endl;
+  }
+
+  return ss.str();
+}
+
+void QueryPool::print_results(const bool tsv_format) {
   EARLY_RETURN_IF_UNINITIALIZED();
-  std::cout << generate_string_report() << std::endl;
+  if (tsv_format) {
+    std::cout << generate_tsv_string_report() << std::endl;
+  } else {
+    std::cout << generate_string_report() << std::endl;
+  }
 }
 
 unsigned long QueryPool::get_total_shader_ns(std::string kernel_name) {

backends/vulkan/runtime/vk_api/QueryPool.h

@@ -99,14 +99,16 @@ class QueryPool final {
 
   std::vector<std::tuple<std::string, uint32_t, uint64_t, uint64_t>>
   get_shader_timestamp_data();
-  std::string generate_string_report();
-  void print_results();
+  void print_results(const bool tsv_format = false);
   unsigned long get_total_shader_ns(std::string kernel_name);
   unsigned long get_mean_shader_ns(std::string kernel_name);
 
   operator bool() const {
     return querypool_ != VK_NULL_HANDLE;
   }
+ private:
+  std::string generate_string_report();
+  std::string generate_tsv_string_report();
 };
 
 } // namespace vkapi