Posix transport should fail if you try to read past EOF

source/adios2/engine/bp5/BP5Reader.cpp

@@ -225,6 +225,12 @@ std::pair<double, double> BP5Reader::ReadData(adios2::transportman::TransportMan
         }
         FileManager.OpenFileID(subFileName, SubfileNum, Mode::Read, m_IO.m_TransportsParameters[0],
                                /*{{"transport", "File"}},*/ false);
+        if (!m_WriterIsActive)
+        {
+            Params transportParameters;
+            transportParameters["FailOnEOF"] = "true";
+            FileManager.SetParameters(transportParameters, -1);
+        }
     }
     TP endSubfile = NOW();
     double timeSubfile = DURATION(startSubfile, endSubfile);
@@ -300,6 +306,11 @@ void BP5Reader::PerformLocalGets()
                 m_WriterMap[m_WriterMapIndex[r2.Timestep]].RankToSubfile[r2.WriterRank]);
     };
 
+    if (!m_InitialWriterActiveCheckDone)
+    {
+        CheckWriterActive();
+        m_InitialWriterActiveCheckDone = true;
+    }
     // TP start = NOW();
     PERFSTUBS_SCOPED_TIMER("BP5Reader::PerformGets");
     m_JSONProfiler.Start("DataRead");

source/adios2/engine/bp5/BP5Reader.h

@@ -113,6 +113,8 @@ class BP5Reader : public BP5Engine, public Engine
 
     Minifooter m_Minifooter;
 
+    bool m_InitialWriterActiveCheckDone = false;
+
     void Init();
     void InitParameters();
     void InitTransports();

source/adios2/toolkit/transport/file/FilePOSIX.cpp

@@ -2,13 +2,12 @@
  * Distributed under the OSI-approved Apache License, Version 2.0.  See
  * accompanying file Copyright.txt for details.
  *
- * FileDescriptor.cpp file I/O using POSIX I/O library
+ * FilePOSIX.cpp file I/O using POSIX I/O library
  *
- *  Created on: Oct 6, 2016
- *      Author: William F Godoy [email protected]
  */
 #include "FilePOSIX.h"
 #include "adios2/helper/adiosLog.h"
+#include "adios2/helper/adiosString.h"
 
 #ifdef ADIOS2_HAVE_O_DIRECT
 #ifndef _GNU_SOURCE
@@ -22,7 +21,8 @@
 #include <fcntl.h>     // open
 #include <sys/stat.h>  // open, fstat
 #include <sys/types.h> // open
-#include <unistd.h>    // write, close, ftruncate
+#include <thread>
+#include <unistd.h> // write, close, ftruncate
 
 /// \cond EXCLUDE_FROM_DOXYGEN
 #include <ios> //std::ios_base::failure
@@ -398,6 +398,7 @@ void FilePOSIX::WriteV(const core::iovec *iov, const int iovcnt, size_t start)
 void FilePOSIX::Read(char *buffer, size_t size, size_t start)
 {
     auto lf_Read = [&](char *buffer, size_t size) {
+        size_t backoff_ns = 20;
         while (size > 0)
         {
             ProfilerStart("read");
@@ -417,6 +418,25 @@ void FilePOSIX::Read(char *buffer, size_t size, size_t start)
                     "Toolkit", "transport::file::FilePOSIX", "Read",
                     "couldn't read from file " + m_Name + " " + SysErrMsg());
             }
+            else if (readSize == 0)
+            {
+                if (m_FailOnEOF)
+                {
+                    helper::Throw<std::ios_base::failure>(
+                        "Toolkit", "transport::file::FilePOSIX", "Read",
+                        "Read past end of file on " + m_Name + " " + SysErrMsg());
+                }
+                else
+                {
+                    // read past EOF, but we're to wait for data.  Exponential backoff with a limit
+                    // of .5 sec (500,000,000 nanosec)
+                    std::this_thread::sleep_for(std::chrono::nanoseconds(backoff_ns));
+                    constexpr size_t backoff_limit = 500 * 1000 * 1000;
+                    backoff_ns *= 2;
+                    if (backoff_ns > backoff_limit)
+                        backoff_ns = backoff_limit;
+                }
+            }
 
             buffer += readSize;
             size -= readSize;
@@ -595,5 +615,14 @@ void FilePOSIX::Truncate(const size_t length)
 
 void FilePOSIX::MkDir(const std::string &fileName) {}
 
+void FilePOSIX::SetParameters(const Params &params)
+{
+    // Parameters are set from config parameters if present
+    // Otherwise, they are set from environment if present
+    // Otherwise, they remain at their default value
+
+    helper::GetParameter(params, "FailOnEOF", m_FailOnEOF);
+}
+
 } // end namespace transport
 } // end namespace adios2

source/adios2/toolkit/transport/file/FilePOSIX.h

@@ -4,8 +4,6 @@
  *
  * FileDescriptor.h wrapper of POSIX library functions for file I/O
  *
- *  Created on: Oct 6, 2016
- *      Author: William F Godoy [email protected]
  */
 
 #ifndef ADIOS2_TOOLKIT_TRANSPORT_FILE_FILEDESCRIPTOR_H_
@@ -68,10 +66,13 @@ class FilePOSIX : public Transport
 
     void MkDir(const std::string &fileName) final;
 
+    void SetParameters(const Params &params) final;
+
 private:
     /** POSIX file handle returned by Open */
     int m_FileDescriptor = -1;
     int m_Errno = 0;
+    bool m_FailOnEOF = false; // default to false for historic reasons
     bool m_IsOpening = false;
     std::future<int> m_OpenFuture;
     bool m_DirectIO = false;

source/adios2/toolkit/transportman/TransportMan.cpp

@@ -4,8 +4,6 @@
  *
  * TransportMan.cpp
  *
- *  Created on: May 23, 2017
- *      Author: William F Godoy [email protected]
  */
 
 #include "TransportMan.h"
@@ -410,6 +408,26 @@ void TransportMan::ReadFile(char *buffer, const size_t size, const size_t start,
     itTransport->second->Read(buffer, size, start);
 }
 
+void TransportMan::SetParameters(const Params &params, const int transportIndex)
+{
+    if (transportIndex == -1)
+    {
+        for (auto &transportPair : m_Transports)
+        {
+            auto &transport = transportPair.second;
+
+            transport->SetParameters(params);
+        }
+    }
+    else
+    {
+        auto itTransport = m_Transports.find(transportIndex);
+        CheckFile(itTransport,
+                  ", in call to SetParameters with index " + std::to_string(transportIndex));
+        itTransport->second->SetParameters(params);
+    }
+}
+
 void TransportMan::FlushFiles(const int transportIndex)
 {
     if (transportIndex == -1)

source/adios2/toolkit/transportman/TransportMan.h

@@ -4,8 +4,6 @@
  *
  * TransportMan.h : manages a vector of transports
  *
- *  Created on: May 23, 2017
- *      Author: William F Godoy [email protected]
  */
 
 #ifndef ADIOS2_TOOLKIT_TRANSPORT_TRANSPORTMANAGER_H_
@@ -210,6 +208,13 @@ class TransportMan
      */
     bool FileExists(const std::string &name, const Params &parameters, const bool profile);
 
+    /**
+     * Set Transport Paramers
+     * @param params
+     * @param transportIndex
+     */
+    void SetParameters(const Params &params, const int transportIndex = -1);
+
 protected:
     core::IO &m_IO;
     helper::Comm const &m_Comm;

testing/adios2/engine/bp/operations/TestBPWriteReadBZIP2.cpp

@@ -148,6 +148,134 @@ void BZIP2Accuracy1D(const std::string accuracy)
     }
 }
 
+void BZIP2Accuracy1DLocal(const std::string accuracy)
+{
+    // Each process would write a 1x8 array and all processes would
+    // write a Nx 1D array
+    const std::string fname("BPWR_BZIP2_1D_Local_" + accuracy + ".bp");
+
+    int mpiRank = 0;
+    // Number of rows
+    const size_t Nx = 1000;
+
+    // Number of steps
+    const size_t NSteps = 1;
+
+    std::vector<float> r32s(Nx);
+    std::vector<double> r64s(Nx);
+
+    // range 0 to 999
+    std::iota(r32s.begin(), r32s.end(), 0.f);
+    std::iota(r64s.begin(), r64s.end(), 0.);
+
+#if ADIOS2_USE_MPI
+    MPI_Comm_rank(MPI_COMM_WORLD, &mpiRank);
+#endif
+
+#if ADIOS2_USE_MPI
+    adios2::ADIOS adios(MPI_COMM_WORLD);
+#else
+    adios2::ADIOS adios;
+#endif
+    {
+        adios2::IO io = adios.DeclareIO("TestIO");
+
+        if (!engineName.empty())
+        {
+            io.SetEngine(engineName);
+        }
+        else
+        {
+            // Create the BP Engine
+            io.SetEngine("BPFile");
+        }
+
+        const adios2::Dims shape{};
+        const adios2::Dims start{};
+        const adios2::Dims count{Nx};
+
+        adios2::Variable<float> var_r32 =
+            io.DefineVariable<float>("r32", shape, start, count, adios2::ConstantDims);
+        adios2::Variable<double> var_r64 =
+            io.DefineVariable<double>("r64", shape, start, count, adios2::ConstantDims);
+
+        // add operations
+        adios2::Operator BZIP2Op =
+            adios.DefineOperator("BZIP2Compressor", adios2::ops::LosslessBZIP2);
+
+        var_r32.AddOperation(BZIP2Op, {{adios2::ops::bzip2::key::blockSize100k, accuracy}});
+        var_r64.AddOperation(BZIP2Op, {{adios2::ops::bzip2::key::blockSize100k, accuracy}});
+
+        adios2::Engine bpWriter = io.Open(fname, adios2::Mode::Write);
+
+        for (size_t step = 0; step < NSteps; ++step)
+        {
+            bpWriter.BeginStep();
+            bpWriter.Put<float>("r32", r32s.data());
+            bpWriter.Put<double>("r64", r64s.data());
+            bpWriter.EndStep();
+        }
+
+        bpWriter.Close();
+    }
+
+    {
+        adios2::IO io = adios.DeclareIO("ReadIO");
+
+        if (!engineName.empty())
+        {
+            io.SetEngine(engineName);
+        }
+        else
+        {
+            // Create the BP Engine
+            io.SetEngine("BPFile");
+        }
+
+        adios2::Engine bpReader = io.Open(fname, adios2::Mode::Read);
+
+        unsigned int t = 0;
+        std::vector<float> decompressedR32s;
+        std::vector<double> decompressedR64s;
+
+        while (bpReader.BeginStep() == adios2::StepStatus::OK)
+        {
+            auto var_r32 = io.InquireVariable<float>("r32");
+            EXPECT_TRUE(var_r32);
+            ASSERT_EQ(var_r32.ShapeID(), adios2::ShapeID::LocalArray);
+            ASSERT_EQ(var_r32.Steps(), NSteps);
+
+            auto var_r64 = io.InquireVariable<double>("r64");
+            EXPECT_TRUE(var_r64);
+            ASSERT_EQ(var_r64.ShapeID(), adios2::ShapeID::LocalArray);
+            ASSERT_EQ(var_r64.Steps(), NSteps);
+            auto r32_info = bpReader.BlocksInfo(var_r32, -1);
+            auto r64_info = bpReader.BlocksInfo(var_r64, -1);
+
+            var_r32.SetBlockSelection(mpiRank);
+            var_r64.SetBlockSelection(mpiRank);
+
+            bpReader.Get(var_r32, decompressedR32s);
+            bpReader.Get(var_r64, decompressedR64s);
+            bpReader.EndStep();
+
+            for (size_t i = 0; i < Nx; ++i)
+            {
+                std::stringstream ss;
+                ss << "t=" << t << " i=" << i << " rank=" << mpiRank;
+                std::string msg = ss.str();
+                ASSERT_EQ(decompressedR32s[i], r32s[i]) << msg;
+                ASSERT_EQ(decompressedR64s[i], r64s[i]) << msg;
+            }
+            ++t;
+        }
+
+        EXPECT_EQ(t, NSteps);
+
+        bpReader.Close();
+    }
+}
+
 void BZIP2Accuracy2D(const std::string accuracy)
 {
     // Each process would write a 1x8 array and all processes would
@@ -830,6 +958,7 @@ class BPWriteReadBZIP2 : public ::testing::TestWithParam<std::string>
 };
 
 TEST_P(BPWriteReadBZIP2, ADIOS2BPWriteReadBZIP21D) { BZIP2Accuracy1D(GetParam()); }
+TEST_P(BPWriteReadBZIP2, ADIOS2BPWriteReadBZIP21DLocal) { BZIP2Accuracy1DLocal(GetParam()); }
 TEST_P(BPWriteReadBZIP2, ADIOS2BPWriteReadBZIP22D) { BZIP2Accuracy2D(GetParam()); }
 TEST_P(BPWriteReadBZIP2, ADIOS2BPWriteReadBZIP23D) { BZIP2Accuracy3D(GetParam()); }
 TEST_P(BPWriteReadBZIP2, ADIOS2BPWriteReadBZIP21DSel) { BZIP2Accuracy1DSel(GetParam()); }

testing/adios2/unit/CMakeLists.txt

@@ -4,4 +4,7 @@
 #------------------------------------------------------------------------------#
 
 gtest_add_tests_helper(ChunkV MPI_NONE "" Unit. "")
+if(UNIX)
+  gtest_add_tests_helper(PosixTransport MPI_NONE "" Unit. "")
+endif()