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近期用java写的email服务器经常出现 broken pipe 错误。 经查验

有可能是linux的线程机制会产生JVM出错的问题，特别是在连接高峰期间经常出现这样的问题，tomcat在linux下也出现类似情况。
　　解决办法是在环境变量中设置： _JAVA_SR_SIGNUM = 12 基本就可以解决。

在WIN环境变量中设置： _JAVA_SR_SIGNUM =12, 若Linux下用 export _JAVA_SR_SIGNUM =12, 基本就可以解决.
　　sun的解释：
　　－－posted by: cooper
　　Below is a clipping from Sun on working around JVM crashes under high
　　thread counts in the JVM 1.3 for Linux
　　On Linux, use a larger signal number for hotspot thread
　　suspension/resumption handler. The signal number being used is
　　specified by environment variable _JAVA_SR_SIGNUM. Setting it to a
　　number larger than SIGSEGV (11) will solve the problem. A good number
　　to use is 12, which is SIGUSR2. Using signal 16 to work around the
　　problem might have potential problems. So on tcsh, "setenv
　　_JAVA_SR_SIGNUM 12" can solve the problem.
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