diff --git a/trunk/src/app/srs_app_http_stream.cpp b/trunk/src/app/srs_app_http_stream.cpp
index fb7bd54b3..3225aa8a4 100755
--- a/trunk/src/app/srs_app_http_stream.cpp
+++ b/trunk/src/app/srs_app_http_stream.cpp
@@ -29,6 +29,7 @@
 #include <sys/stat.h>
 #include <fcntl.h>
 #include <stdlib.h>
+#include <unistd.h>
 
 #include <sstream>
 using namespace std;
@@ -1132,8 +1133,8 @@ srs_error_t SrsHttpStreamServer::hijack(ISrsHttpMessage* request, ISrsHttpHandle
     
     // trigger edge to fetch from origin.
     bool vhost_is_edge = _srs_config->get_vhost_is_edge(r->vhost);
-    srs_trace("flv: source url=%s, is_edge=%d, source_id=%d[%d]",
-        r->get_stream_url().c_str(), vhost_is_edge, s->source_id(), s->source_id());
+    srs_trace("flv: source url=%s, is_edge=%d, source_id=[%d][%d]",
+        r->get_stream_url().c_str(), vhost_is_edge, ::getpid(), s->source_id());
     
     return err;
 }
diff --git a/trunk/src/app/srs_app_rtc_conn.cpp b/trunk/src/app/srs_app_rtc_conn.cpp
index ad09f51fb..13e74f636 100644
--- a/trunk/src/app/srs_app_rtc_conn.cpp
+++ b/trunk/src/app/srs_app_rtc_conn.cpp
@@ -662,8 +662,8 @@ srs_error_t SrsRtcSenderThread::cycle()
         return srs_error_wrap(err, "rtc fetch source failed");
     }
 
-    srs_trace("source url=%s, source_id=%d[%d]",
-        rtc_session->request.get_stream_url().c_str(), source->source_id(), source->source_id());
+    srs_trace("source url=%s, source_id=[%d][%d]",
+        rtc_session->request.get_stream_url().c_str(), ::getpid(), source->source_id());
 
 	SrsConsumer* consumer = NULL;
     if ((err = source->create_consumer(NULL, consumer)) != srs_success) {
diff --git a/trunk/src/app/srs_app_rtmp_conn.cpp b/trunk/src/app/srs_app_rtmp_conn.cpp
index c7e943337..bd70381e6 100644
--- a/trunk/src/app/srs_app_rtmp_conn.cpp
+++ b/trunk/src/app/srs_app_rtmp_conn.cpp
@@ -507,8 +507,8 @@ srs_error_t SrsRtmpConn::stream_service_cycle()
     }
     
     bool enabled_cache = _srs_config->get_gop_cache(req->vhost);
-    srs_trace("source url=%s, ip=%s, cache=%d, is_edge=%d, source_id=%d[%d]",
-        req->get_stream_url().c_str(), ip.c_str(), enabled_cache, info->edge, source->source_id(), source->source_id());
+    srs_trace("source url=%s, ip=%s, cache=%d, is_edge=%d, source_id=[%d][%d]",
+        req->get_stream_url().c_str(), ip.c_str(), enabled_cache, info->edge, ::getpid(), source->source_id());
     source->set_cache(enabled_cache);
     
     switch (info->type) {