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MPI-DB

MPI-DB. A parallel software library providing database services to scientific computing processes. E. Givelberg Department of Physics IDIES JHU. MPIDB: create data structures. 1 #include ”mpidb.h”  22  23  24 int  25 main( int  argc, char  **argv)  26 {

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MPI-DB

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  1. MPI-DB A parallel software library providing database services to scientific computing processes E. Givelberg Department of Physics IDIES JHU

  2. MPIDB: create data structures 1 #include ”mpidb.h”  22  23  24 int  25 main(int argc, char **argv)  26 {  27     mpidb::start(argc, argv);  28  29 if (mpidb::NumberOfProcessors() != 2)  30         mpidb::exit("This demo is for 2 processors only.");  31  32 // create the data structures  33  34 // int n = 128;  35 int n = 8;  36 int halfn = n / 2;  37 int n1 = n;  38 int n2 = n;  39 int n3 = n;  40 int n31 = mpidb::MyID() * halfn;  41 int n32 =  mpidb::MyID() * halfn + halfn - 1;  42  43     mpidb::Domain * domain1  44         = new mpidb::Domain(0, n1 - 1, 0, n2 - 1, n31, n32);  45  46     mpidb::Array * a = new mpidb::Array(domain1, mpidb::DOUBLE);

  3. MPIDB: create data structures  48 int N = n * n * halfn;  49 double * data = newdouble[N];  50  51 for (int i1 = 0;  i1 < n1; i1 ++)  52 for (int i2 = 0;  i2 < n2; i2 ++)  53 for (int i3 = 0;  i3 < halfn; i3 ++)  54     {  55         data[i1 * n2 * n3 + i2 * n3 + i3] = 100.0 + mpidb::MyID();  56     }  57  58     ostringstream name;  59     name << "test" << mpidb::MyID();  60  61     mpidb::DataStream * s = new mpidb::DataStream(a, name.str().c_str());  62  63     mpidb::DataSet * d = new mpidb::DataSet(name.str().c_str());  64  65     d->AddStream(s);  66

  4. MPIDB: connect to server 66  67  68 // get the port name of the master server for MPI-DB  69  70     std::ifstream i;  71     i.open(mpidb::ServerAddressFilename);  72 char ServerAddress [MPI_MAX_PORT_NAME];  73     i.getline(ServerAddress, MPI_MAX_PORT_NAME);  74     i.close();  75  76  77 if (mpidb::MyID() == 0)  78         cerr << "Connecting to server address: " << ServerAddress << endl;  79  80     mpidb::Connection * c = new mpidb::Connection();  81  82 if (!c->ConnectToServer(ServerAddress))  83     {  84         mpidb::exit("failed to connect to server... disconnecting");  85     }  86  87  88

  5. MPIDB: access database server 93  94  95     mpidb::DBType dbtype;  96 #ifdef MySQL  97     dbtype = mpidb::MySQLDB;  98 #endif  99 #ifdef SQLServer 100     dbtype = mpidb::SQLServerDB; 101 #endif 102 103 104 if (!c->AccessDBServer(dbtype, "localhost", "mpidb", ”testuser", ”password")) 105     { 106 delete c; 107         mpidb::exit("failed to access the database"); 108     } 109

  6. MPIDB: create data set 115 116 if (!d->CreateAndBindToDatabase(c)) 117     { 118 delete c; 119         mpidb::exit("failed to create a new data set"); 120     } 121 124 125 if (!s->PushData(c, data)) 126     { 127 delete c; 128         mpidb::exit("failed to store the data"); 129     } 130 131     c->DisconnectFromServer(); 136 139     mpidb::finish(); 140 141 return0; 142 143 }   // main

  7. User Management Layer client server Simulation Data Layer client server Database Access Layer client server database MPI Transport Layer client server network connection

  8. Thank you!

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