loading very large graph failed

I have installed graphviz on windows and it works fine when i load small graphs and also able to apply some layouts algo but when i load very large graph about 300000 nodes and 800000 edges it stops working and gives message to stop the application. PLease help me its urgent, thank you in advance

Graphviz has many features.

Graphviz has many features. To provide these, nodes and edges have to be several hundred bytes in size. This means that it probably can't handle very large graphs. The core layout algorithm for sfdp uses sparse matrices. It would not be hard to wrap the core with routines to read and write the relevant matrices.