Tenho uma aplicação que executa diversos arquivos .bat, desenvolvidos em outras linguagens de programação.
Quando eu chamo esses bats através do comando Runtime.getRuntime().exec(), o tempo de I/O é muito maior do que se eles tivessem sido executados foram do meu programa em java.
The Runtime.exec methods may not work well for special processes on certain native platforms, such as native windowing processes, daemon processes, Win16/DOS processes on Microsoft Windows, or shell scripts. The created subprocess does not have its own terminal or console. All its standard io (i.e. stdin, stdout, stderr) operations will be redirected to the parent process through three streams (Process.getOutputStream(), Process.getInputStream(), Process.getErrorStream()). The parent process uses these streams to feed input to and get output from the subprocess. Because some native platforms only provide limited buffer size for standard input and output streams, failure to promptly write the input stream or read the output stream of the subprocess may cause the subprocess to block, and even deadlock.
http://download.oracle.com/javase/1.4.2/docs/api/java/lang/Process.html
Talvez essa classe lhe interesse, eu a usava há algum tempo: http://download.oracle.com/javase/1.5.0/docs/api/java/lang/ProcessBuilder.html
Muito obrigado renamed.
Fiz os testes e o desempenho continuou o mesmo. Muito lento ainda.