an im for testing 100,000 concurrent tcp connections
usage:
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route_server: ./route_server route_server will listen on port 8000
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im_server: ./im_server im_server_ip route_server_ip if route_server is not on, the the im_server can work as a single server
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im_client: ./imclient im_server_ip src_start_id src_end_id dst_start_id dst_end_id pkt_per_second pkt_size