From eb4684531307f1f1278a1e0869c8ebaf8ced4dc0 Mon Sep 17 00:00:00 2001
From: Xin Pan <panxin.grad@gmail.com>
Date: Wed, 7 Mar 2018 18:07:42 -0800
Subject: [PATCH] Add warning

---
 paddle/fluid/platform/device_tracer.cc | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/paddle/fluid/platform/device_tracer.cc b/paddle/fluid/platform/device_tracer.cc
index 6efe703e22..8e1691efb5 100644
--- a/paddle/fluid/platform/device_tracer.cc
+++ b/paddle/fluid/platform/device_tracer.cc
@@ -201,6 +201,7 @@ class DeviceTracerImpl : public DeviceTracer {
                      uint32_t correlation_id, uint64_t bytes) {
     // 0 means timestamp information could not be collected for the kernel.
     if (start_ns == 0 || end_ns == 0) {
+      LOG(WARNING) << name << " cannot be traced";
       return;
     }
     std::lock_guard<std::mutex> l(trace_mu_);
@@ -212,6 +213,7 @@ class DeviceTracerImpl : public DeviceTracer {
                         uint32_t stream_id, uint32_t correlation_id) {
     // 0 means timestamp information could not be collected for the kernel.
     if (start == 0 || end == 0) {
+      LOG(WARNING) << correlation_id << " cannot be traced";
       return;
     }
     std::lock_guard<std::mutex> l(trace_mu_);
-- 
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