Update tracing of benchmark only when env var is set (#2409)

src/targets/gpu/compile_ops.cpp

@@ -168,6 +168,7 @@ struct compile_plan
     }
     const compiled_result& benchmark(problem_cache& pc) const
     {
+        const auto trace_level = value_of(MIGRAPHX_TRACE_BENCHMARKING{});
         if(results.empty())
             MIGRAPHX_THROW("No configs to tune");
         if(results.size() == 1)
@@ -178,9 +179,10 @@ struct compile_plan
         }
         if(not config)
             MIGRAPHX_THROW("Multiple kernels without config");
+        if(trace_level > 0)
             std::cout << "Benchmarking " << preop.name() << ": " << results.size() << " configs"
                       << std::endl;
-        if(enabled(MIGRAPHX_TRACE_BENCHMARKING{}))
+        if(trace_level > 1)
             std::cout << "Problem: " << config->problem << std::endl;
         std::vector<double> times;
         times.reserve(results.size());
@@ -189,21 +191,22 @@ struct compile_plan
                        config->solutions.begin(),
                        std::back_inserter(times),
                        [&](const auto& cr, const auto& solution) {
-                           if(enabled(MIGRAPHX_TRACE_BENCHMARKING{}))
+                           if(trace_level > 1)
                                std::cout << "Benchmarking solution: " << solution << std::endl;
                            if(not cr.has_value())
                            {
-                               if(enabled(MIGRAPHX_TRACE_BENCHMARKING{}))
+                               if(trace_level > 1)
                                    std::cout << "No binary" << std::endl;
                                return std::numeric_limits<double>::max();
                            }
                            auto t = time_op(
                                *ctx, cr->replace.code_object, to_shapes(cr->ins->inputs()), 20);
-                           if(enabled(MIGRAPHX_TRACE_BENCHMARKING{}))
+                           if(trace_level > 1)
                                std::cout << t << "ms" << std::endl;
                            return t;
                        });
         auto i = std::distance(times.begin(), std::min_element(times.begin(), times.end()));
+        if(trace_level > 0)
             std::cout << "Fastest solution: " << config->solutions.at(i) << std::endl;
         pc.insert(preop.name(), config->problem, config->solutions.at(i));
         if(not results[i].has_value())