Newsgroups: comp.parallel.mpi From: Stephen O'Sullivan Subject: io problems on shared files Organization: Dublin Institute for Advanced Studies Date: Mon, 28 Apr 1997 18:03:02 +0100 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <3364D846.2C8C@cp.dias.ie> I am having a lot of trouble getting multiple processes to append output to a single file. The results look like there is a synchronization problem or that the streams are not properly established when connecting to a file which another process has written. The output is sometimes overwritten completely or partially. This happens for both the standard io library (in C) and the low level system io library functions. I have tried explicitly flushing the buffer, locking the file, clearing the file pointer to NUll after use and more. Outputting to standard output and piping to file gives the complete output without the problems described above-I have no idea what this could mean. If anyone has come across this sort of problem I would be grateful for their correspondence because I'm about to give up.  -- =========================================================================== Stephen O'Sullivan | Telephone: +353-1-6621333 School of Cosmic Physics | Facsimile: +353-1-6621477 Dublin Institute for Advanced Studies | email: so@cp.dias.ie 5 Merrion Square | Dublin 2 Ireland | WWW: http://atlas.cp.dias.ie/~so/ ===========================================================================