From: Paul H. Hargrove (PHHargrove_at_lbl_dot_gov)
Date: Tue Apr 21 2009 - 11:40:09 PDT
Wei Zhongwei, Answer 1: Checkpointing with BLCR works at the operating system level and does not know or care what language the program was written in, as long as the program does not do things (like network communication) that BLCR can't handle. BLCR has been tested with C, Java, php, perl, python, ruby, tcl, and many other languages. However, if your application needs to interact with BLCR to do something "extra" you currently need to write that interaction in C (see answer #2) Answer 2: You already know that BLCR doesn't support checkpointing with sockets. My only advice to you would be to see if there is some way to close the socket connection before taking a checkpoint and re-establishing the connection after. If you have C source code for your application, you might be able to write a BLCR "callback" to be run in your application when the checkpoint is taken. This callback could close and reopen the socket connection. HOWEVER, I am concerned that there is probably some state associated with the "dialog" between your application and the Database that would not be valid after breaking the connection like this. So, I am worried that there might be no easy solution for your database-connected application. -Paul Weizhongwei wrote: > Dear Pro: > When I use blcr ,I encouter some questions. So I need your help. > Question1: I want to konw what languages does blcr support. Does it > support other programm languages but C,such as Java, php etc. > > Qestion2: There is some Database connection in my programm , but blcr > does'n support socket checkpoint. Can you give me some advice for > dealing with this problem? > > > Thank you very much! > Expect your answers. > > yours > > Wei.Zhongwei > > > ------------------------------------------------------------------------ > 好玩贺卡等你发，邮箱贺卡全新上线！ > <http://cn.rd.yahoo.com/mail_cn/tagline/card/*http://card.mail.cn.yahoo.com/> -- Paul H. Hargrove PHHargrove_at_lbl_dot_gov Future Technologies Group Tel: +1-510-495-2352 HPC Research Department Fax: +1-510-486-6900 Lawrence Berkeley National Laboratory