4.5.4 Parallelization

Many of things MathGL do in parallel by default (if MathGL was built with pthread). However, there is function which set the number of threads to be used.

C function: int mgl_set_num_thr (int n)

Set the number of threads to be used by MathGL. If n<1 then the number of threads is set as maximal number of processors (cores). If n=1 then single thread will be used (this is default if pthread was disabled).

Another option is combining bitmap image (taking into account Z-ordering) from different instances. This method is most appropriate for computer clusters when the data size is so large that it exceed the memory of single computer node.

Method on mglGraph: int Combine (const mglGraph *g)

C function: int mgl_combine_gr (HMGL gr, HMGL g)

Combine drawing from instance g with gr (or with this) taking into account Z-ordering of pixels. The width and height of both instances must be the same.

Method on mglGraph: int MPI_Send (int id)

C function: int mgl_mpi_send (HMGL gr, int id)

Send graphical information from node id using MPI. The width and height in both nodes must be the same.

Method on mglGraph: int MPI_Recv (int id)

C function: int mgl_mpi_send (HMGL gr, int id)

Receive graphical information from node id using MPI. The width and height in both nodes must be the same.

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