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Full Discussion: Soft kill a process to redirect the last kbytes output to a file
Top Forums Shell Programming and Scripting Soft kill a process to redirect the last kbytes output to a file Post 302952542 by Corona688 on Wednesday 19th of August 2015 04:45:35 PM
Old 08-19-2015
Quote:
Originally Posted by Mastaer
thank you jim mcnamar,

but the problem is not the python script. it is ok to hard kill the python script.
It doesn't hurt the script or your system to hard-kill it, no -- but it certainly doesn't do what you want.

Python does single writes every 4096 bytes because this more efficient than doing 50 tinier writes. Python streams do this on the assumption the stream will end naturally, not get hard-killed while waiting for the 4096th byte. This is not a shell thing, a redirection thing, or any kind of system buffer -- the buffer is in Python, part of Python's code, controlled by Python, and must be configured in Python to disable Python's write buffer.

This is not the same as system disk cache, that's transparent, you'd see a correct result if the system knew it was supposed to be there.

This is not the same as the buffers used for pipes. Those don't apply when not using pipes.

You cannot force Python or any other program to not buffer from the outside, unless there's some mysterious NEVER_BUFFER environment variable Python responds to or something.
This User Gave Thanks to Corona688 For This Post:
Mastaer
 

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LEARN ABOUT DEBIAN

update-python-modules

UPDATE-PYTHON-MODULES(8)				      System Manager's Manual					  UPDATE-PYTHON-MODULES(8)

NAME

       update-python-modules - byte-compile python modules

SYNOPSIS

       update-python-modules [options] [package.public [...]]

DESCRIPTION

       The update-python-modules command is part of the python-support bundle.

       update-python-modules  is  responsible for the byte-compilation of python modules. When used in byte-compilation mode, it will byte-compile
       modules references in the files given on the command line. When used in	installation  mode,  it  will  byte-compile  them  once  for  each
       installed python version, and will make them available for all of them.

       At  each  invocation,  with  or without arguments, update-python-modules will check for installed python versions, and will build or remove
       modules according to new or removed versions since the last time it was run.

ARGUMENTS

       Arguments must be files or directories located in the /usr/share/python-support directory. Depending on their extension, they  are  treated
       differently.

       package.public
	      A file listing public modules to install for each version. These modules must lie in /usr/share/pyshared or /usr/lib/pyshared.

       package.private
	      A file listing private modules to byte-compile for one Python version.

       package/
	      A legacy directory hierarchy of public modules. The C extensions and portions that change with the Python version are to be found in
	      /usr/lib/python-support/pythonX.Y/package/.

       package.dirs
	      A legacy file listing directories where to find private modules.

OPTIONS

       -h, --help
	      Show summary of options.

       -v, --verbose
	      Detail all actions while they are performed.

       -b, --bytecompile
	      Only accept to work on private modules. When given this option, update-python-modules will fail if passed references to public  mod-
	      ules.

       -i, --install
	      Only  accept  to work on public modules. When given this option, update-python-modules will fail if passed references to public mod-
	      ules.

       -c, --clean
	      Clean modules instead of installing them.

       -a, --rebuild-all
	      Rebuild all private modules. This is necessary when the default python version was changed, for example.

       -f, --force-rebuild-all
	      Clean all modules (public and private), and rebuild them.

FILES

       /usr/lib/pymodules/pythonX.Y/
	      These directories contain the byte-compiled modules for version pythonX.Y.

SEE ALSO

       /usr/share/doc/python-support/README.gz

AUTHOR

       Josselin Mouette <joss@debian.org>.

								    18 Feb 2009 					  UPDATE-PYTHON-MODULES(8)
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