I am using python in arcmap 10.0 to execute "Topo To Raster" tool. I am successful to execute this in blocking/sync mode. but I want to execute this tool with python in async mode.

workspacePath = sys.argv[1] 
input = sys.argv[2]
output = sys.argv[3]    

It sounds like what you are after is Background Geoprocessing, which was introduced at ArcGIS Desktop 10.0.

However, I think ArcPy only became "Background Geoprocessing aware" with the introduction of Python Toolboxes at 10.1 - see Setting "Always run in foreground" within ArcPy code?

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