Add example with ref-counted copy from unmanaged region

examples/region/CMakeLists.txt

@@ -7,5 +7,6 @@
 ################################################################################
 
 add_example(NAME region
-  DEVICE sampler sink keep-alive
+  DEVICE sampler processor sink keep-alive
+  SCRIPT region region-advanced
 )

examples/region/fairmq-start-ex-region-advanced.sh.in

@@ -0,0 +1,53 @@
+#!/bin/bash
+
+export FAIRMQ_PATH=@FAIRMQ_BIN_DIR@
+
+transport="shmem"
+msgSize="1000000"
+
+if [[ $1 =~ ^[a-z]+$ ]]; then
+    transport=$1
+fi
+
+if [[ $2 =~ ^[0-9]+$ ]]; then
+    msgSize=$1
+fi
+
+SAMPLER="fairmq-ex-region-sampler"
+SAMPLER+=" --id sampler1"
+# SAMPLER+=" --sampling-rate 10"
+SAMPLER+=" --severity debug"
+SAMPLER+=" --msg-size $msgSize"
+SAMPLER+=" --transport $transport"
+SAMPLER+=" --shm-monitor true"
+SAMPLER+=" --chan-name data1"
+SAMPLER+=" --channel-config name=data1,type=push,method=bind,address=tcp://127.0.0.1:7777"
+xterm -geometry 120x60+0+0 -hold -e @EX_BIN_DIR@/$SAMPLER &
+
+PROCESSOR="fairmq-ex-region-processor"
+PROCESSOR+=" --id processor1"
+PROCESSOR+=" --severity debug"
+PROCESSOR+=" --transport $transport"
+PROCESSOR+=" --shm-monitor true"
+PROCESSOR+=" --channel-config name=data1,type=pull,method=connect,address=tcp://127.0.0.1:7777"
+PROCESSOR+="                  name=data2,type=push,method=bind,address=tcp://127.0.0.1:7778"
+PROCESSOR+="                  name=data3,type=push,method=bind,address=tcp://127.0.0.1:7779"
+xterm -geometry 120x60+750+0 -hold -e @EX_BIN_DIR@/$PROCESSOR &
+
+SINK1="fairmq-ex-region-sink"
+SINK1+=" --id sink1"
+SINK1+=" --severity debug"
+SINK1+=" --chan-name data2"
+SINK1+=" --transport $transport"
+SINK1+=" --shm-monitor true"
+SINK1+=" --channel-config name=data2,type=pull,method=connect,address=tcp://127.0.0.1:7778"
+xterm -geometry 120x32+1500+0 -hold -e @EX_BIN_DIR@/$SINK1 &
+
+SINK2="fairmq-ex-region-sink"
+SINK2+=" --id sink2"
+SINK2+=" --severity debug"
+SINK2+=" --chan-name data3"
+SINK2+=" --transport $transport"
+SINK2+=" --shm-monitor true"
+SINK2+=" --channel-config name=data3,type=pull,method=connect,address=tcp://127.0.0.1:7779"
+xterm -geometry 120x32+1500+500 -hold -e @EX_BIN_DIR@/$SINK2 &

examples/region/processor.cxx

@@ -0,0 +1,74 @@
+/********************************************************************************
+ * Copyright (C) 2014-2021 GSI Helmholtzzentrum fuer Schwerionenforschung GmbH  *
+ *                                                                              *
+ *              This software is distributed under the terms of the             *
+ *              GNU Lesser General Public Licence (LGPL) version 3,             *
+ *                  copied verbatim in the file "LICENSE"                       *
+ ********************************************************************************/
+
+#include <fairmq/Device.h>
+#include <fairmq/runDevice.h>
+#include <memory>
+
+namespace bpo = boost::program_options;
+using namespace std;
+using namespace fair::mq;
+
+namespace {
+
+struct Processor : Device
+{
+    void InitTask() override
+    {
+        fMaxIterations = fConfig->GetProperty<uint64_t>("max-iterations");
+        GetChannel("data1", 0).Transport()->SubscribeToRegionEvents([](RegionInfo info) {
+            LOG(info) << "Region event: " << info.event << ": "
+                      << (info.managed ? "managed" : "unmanaged") << ", id: " << info.id
+                      << ", ptr: " << info.ptr << ", size: " << info.size
+                      << ", flags: " << info.flags;
+        });
+    }
+
+    void Run() override
+    {
+        Channel& dataIn = GetChannel("data1", 0);
+        Channel& dataOut1 = GetChannel("data2", 0);
+        Channel& dataOut2 = GetChannel("data3", 0);
+
+        while (!NewStatePending()) {
+            auto msg(dataIn.Transport()->CreateMessage());
+            dataIn.Receive(msg);
+
+            fair::mq::MessagePtr msgCopy1(NewMessage());
+            msgCopy1->Copy(*msg);
+            fair::mq::MessagePtr msgCopy2(NewMessage());
+            msgCopy2->Copy(*msg);
+
+            dataOut1.Send(msgCopy1);
+            dataOut2.Send(msgCopy2);
+
+            if (fMaxIterations > 0 && ++fNumIterations >= fMaxIterations) {
+                LOG(info) << "Configured max number of iterations reached. Leaving RUNNING state.";
+                break;
+            }
+        }
+    }
+
+    void ResetTask() override
+    {
+        GetChannel("data1", 0).Transport()->UnsubscribeFromRegionEvents();
+    }
+
+  private:
+    uint64_t fMaxIterations = 0;
+    uint64_t fNumIterations = 0;
+};
+
+}   // namespace
+
+void addCustomOptions(bpo::options_description& options)
+{
+    options.add_options()("max-iterations", bpo::value<uint64_t>()->default_value(0), "Maximum number of iterations of Run/ConditionalRun/OnData (0 - infinite)");
+}
+
+unique_ptr<Device> getDevice(ProgOptions& /*config*/) { return make_unique<Processor>(); }

examples/region/sampler.cxx

@@ -8,6 +8,7 @@
 
 #include <fairmq/Device.h>
 #include <fairmq/runDevice.h>
+#include <fairmq/tools/RateLimit.h>
 
 #include <cstdint>
 #include <mutex>
@@ -23,8 +24,10 @@ struct Sampler : fair::mq::Device
         fMsgSize = fConfig->GetProperty<int>("msg-size");
         fLinger = fConfig->GetProperty<uint32_t>("region-linger");
         fMaxIterations = fConfig->GetProperty<uint64_t>("max-iterations");
+        fChanName = fConfig->GetProperty<std::string>("chan-name");
+        fSamplingRate = fConfig->GetProperty<float>("sampling-rate");
 
-        GetChannel("data", 0).Transport()->SubscribeToRegionEvents([](fair::mq::RegionInfo info) {
+        GetChannel(fChanName, 0).Transport()->SubscribeToRegionEvents([](fair::mq::RegionInfo info) {
             LOG(info) << "Region event: " << info.event << ": "
                     << (info.managed ? "managed" : "unmanaged")
                     << ", id: " << info.id
@@ -43,7 +46,7 @@ struct Sampler : fair::mq::Device
         regionCfg.lock = !fExternalRegion; // mlock region after creation
         regionCfg.zero = !fExternalRegion; // zero region content after creation
         fRegion = fair::mq::UnmanagedRegionPtr(NewUnmanagedRegionFor(
-            "data", // region is created using the transport of this channel...
+            fChanName, // region is created using the transport of this channel...
             0,      // ... and this sub-channel
             10000000, // region size
             [this](const std::vector<fair::mq::RegionBlock>& blocks) { // callback to be called when message buffers no longer needed by transport
@@ -59,8 +62,11 @@ struct Sampler : fair::mq::Device
 
     void Run() override
     {
+
+        fair::mq::tools::RateLimiter rateLimiter(fSamplingRate);
+
         while (!NewStatePending()) {
-            fair::mq::MessagePtr msg(NewMessageFor("data", // channel
+            fair::mq::MessagePtr msg(NewMessageFor(fChanName, // channel
                                                 0, // sub-channel
                                                 fRegion, // region
                                                 fRegion->GetData(), // ptr within region
@@ -70,11 +76,14 @@ struct Sampler : fair::mq::Device
 
             std::lock_guard<std::mutex> lock(fMtx);
             ++fNumUnackedMsgs;
-            if (Send(msg, "data", 0) > 0) {
+            if (Send(msg, fChanName, 0) > 0) {
                 if (fMaxIterations > 0 && ++fNumIterations >= fMaxIterations) {
                     LOG(info) << "Configured maximum number of iterations reached. Stopping sending.";
                     break;
                 }
+                if (fSamplingRate > 0.001) {
+                    rateLimiter.maybe_sleep();
+                }
             }
         }
 
@@ -99,7 +108,7 @@ struct Sampler : fair::mq::Device
     void ResetTask() override
     {
         fRegion.reset();
-        GetChannel("data", 0).Transport()->UnsubscribeFromRegionEvents();
+        GetChannel(fChanName, 0).Transport()->UnsubscribeFromRegionEvents();
     }
 
   private:
@@ -111,12 +120,16 @@ struct Sampler : fair::mq::Device
     fair::mq::UnmanagedRegionPtr fRegion = nullptr;
     std::mutex fMtx;
     uint64_t fNumUnackedMsgs = 0;
+    std::string fChanName;
+    float fSamplingRate = 0.;
 };
 
 void addCustomOptions(bpo::options_description& options)
 {
     options.add_options()
+        ("chan-name", bpo::value<std::string>()->default_value("data"), "name of the output channel")
         ("msg-size", bpo::value<int>()->default_value(1000), "Message size in bytes")
+        ("sampling-rate", bpo::value<float>()->default_value(0.), "Sampling rate (Hz).")
         ("region-linger", bpo::value<uint32_t>()->default_value(100), "Linger period for regions")
         ("max-iterations", bpo::value<uint64_t>()->default_value(0), "Maximum number of iterations of Run/ConditionalRun/OnData (0 - infinite)")
         ("external-region", bpo::value<bool>()->default_value(false), "Use region created by another process");

examples/region/sink.cxx

@@ -22,7 +22,8 @@ struct Sink : Device
     {
         // Get the fMaxIterations value from the command line options (via fConfig)
         fMaxIterations = fConfig->GetProperty<uint64_t>("max-iterations");
-        GetChannel("data", 0).Transport()->SubscribeToRegionEvents([](RegionInfo info) {
+        fChanName = fConfig->GetProperty<std::string>("chan-name");
+        GetChannel(fChanName, 0).Transport()->SubscribeToRegionEvents([](RegionInfo info) {
             LOG(info) << "Region event: " << info.event << ": "
                       << (info.managed ? "managed" : "unmanaged") << ", id: " << info.id
                       << ", ptr: " << info.ptr << ", size: " << info.size
@@ -32,11 +33,11 @@ struct Sink : Device
 
     void Run() override
     {
-        Channel& dataInChannel = GetChannel("data", 0);
+        Channel& dataIn = GetChannel(fChanName, 0);
 
         while (!NewStatePending()) {
-            auto msg(dataInChannel.Transport()->CreateMessage());
-            dataInChannel.Receive(msg);
+            auto msg(dataIn.Transport()->CreateMessage());
+            dataIn.Receive(msg);
 
             // void* ptr = msg->GetData();
             // char* cptr = static_cast<char*>(ptr);
@@ -51,22 +52,22 @@ struct Sink : Device
 
     void ResetTask() override
     {
-        GetChannel("data", 0).Transport()->UnsubscribeFromRegionEvents();
+        GetChannel(fChanName, 0).Transport()->UnsubscribeFromRegionEvents();
     }
 
   private:
     uint64_t fMaxIterations = 0;
     uint64_t fNumIterations = 0;
+    std::string fChanName;
 };
 
 }   // namespace
 
 void addCustomOptions(bpo::options_description& options)
 {
-    options.add_options()(
-        "max-iterations",
-        bpo::value<uint64_t>()->default_value(0),
-        "Maximum number of iterations of Run/ConditionalRun/OnData (0 - infinite)");
+    options.add_options()
+        ("chan-name", bpo::value<std::string>()->default_value("data"), "name of the input channel")
+        ("max-iterations", bpo::value<uint64_t>()->default_value(0), "Maximum number of iterations of Run/ConditionalRun/OnData (0 - infinite)");
 }
 
 unique_ptr<Device> getDevice(ProgOptions& /*config*/) { return make_unique<Sink>(); }