2010/2/5 Chap Harrison: > > This is wordy but I've tried to make it clear :-)
Its completely clear, thanks. > I have a Perl app running in Cygwin 1.7.1, whose job is to monitor the log > files being written by a Java program on another Windows Server 2003 box > elsewhere on the LAN. (I'm using the CPAN File::Tail module, which provides > 'tail -f' functionality, to monitor the log.) > > > The actual I/O is fine. File::Tail responds very quickly to new data being > written by the Java program to the log files in the shared folder on the > LAN. > > The Perl app watches for log messages from the Java program that say, in > effect, "I just closed file foo.txt". It then moves foo.txt into another > directory. > > However, it is frequently the case that the Perl program cannot move > (File::Move) the file - sometimes even after trying 5 times at one-second > intervals. My suspicion is that the file is slow to be seen as officially > "closed" by all interested parties. Correct. Closing or deleting a file is insanely from by the windows kernel side, compared to other systems. I usually have to wait 30ms until I can move the file away. > And even when the Java program has halted, and has presumably closed all the > files it created, but has not yet been "Quit" from the GUI, the Perl program > is glacially slow to move the remaining files. What's more, at this point > any other bash shells I'm running in Cygwin become almost completely > unresponsive, even just moving the cursor. 5s looks more like a race. But I have no idea what could cause the race. Could be that Java is still holding the handle until the gc frees it. But I have no idea about java, only lisp. > When I quit the Java app from its GUI, everything instantly returns to > normal. > > I'm guessing this has something to do with concurrency control over > network-shared resources (the output files Java wrote and I'm trying to > move). > > Just to add another layer of complexity, the Cygwin host OS (WinServer 2003) > is running as a virtual machine hosted by a real box running WinServer 2003 > and Virtual Server 2005. > > Any explanations, solutions, or workarounds? > > Thanks, > Chap -- Reini Urban http://phpwiki.org/ http://murbreak.at/ -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
