diff options
| author | schnetter <schnetter@17b73243-c579-4c4c-a9d2-2d5706c11dac> | 2006-06-23 04:16:13 +0000 |
|---|---|---|
| committer | schnetter <schnetter@17b73243-c579-4c4c-a9d2-2d5706c11dac> | 2006-06-23 04:16:13 +0000 |
| commit | a5554988d7b607ddb66ac499f3f9ceb74a35f31d (patch) | |
| tree | c030a082c7512f973e8859911a2ec74f2a969c6e /doc | |
| parent | 4d5f9ed6fdc103aa509c79e14d1ec4680e643925 (diff) | |
Add a new command line option to select the buffering mode of stdout.
The option is "-b <mode>", or "-buffering=<mode>", where mode can be
"no", "line", or "full". This option uses the ANSI C function call
setvbuf() to select the corresponding buffering mode.
The buffering mode can be selected only once in a portable programme,
and it has to be selected before the first output occurs. This means
that it has to be implemented in the flesh.
git-svn-id: http://svn.cactuscode.org/flesh/trunk@4329 17b73243-c579-4c4c-a9d2-2d5706c11dac
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/UsersGuide/RunningCactus.tex | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/doc/UsersGuide/RunningCactus.tex b/doc/UsersGuide/RunningCactus.tex index 41d8b09d..3ce4f1bf 100644 --- a/doc/UsersGuide/RunningCactus.tex +++ b/doc/UsersGuide/RunningCactus.tex @@ -1266,6 +1266,8 @@ Short Version & Long Version \\ \hline -r[o|e|oe|eo] & -redirect=[o|e|oe|eo]\\ \hline + -b <\var{mode}> & -buffering=<\var{mode}>\\ +\hline -i & -ignore-next \\ \hline & -parameter-level=<\var{level}> \\ @@ -1324,6 +1326,22 @@ will abort the Cactus run. Redirects the standard output (`\texttt{o}') and/or standard error (`\texttt{e}') of each processor to a file. By default the standard outputs from processors other than processor 0 are discarded. + +\item [\texttt{-b <\var{mode}>} or \texttt{-buffering=<\var{mode}>}] + Set the \texttt{stdout} buffering mode. \var{mode} can be one of + \texttt{no}, \texttt{line}, and \texttt{full}. Buffered I/O is a + standard feature of C programmes. This delays writing the actual + output; instead, the output is collected into an internal buffer, + and is then written in large chunks. This improves performance + considerably. Line buffering means that output is written whenever + a newline character is encountered; full buffering means that output + is written once e.g.\ 1000 characters have accmulated. The default + setting is line buffering for I/O that goes to a terminal, and full + buffering for I/O that goes to a file. For debugging purposes, it + is sometimes useful to reduce the amount of buffering. Error + messages, i.e.\ the \texttt{stderr} stream, is always unbuffered + (and hence usually slower than \texttt{stdout}). + \item [\texttt{-i} or \texttt{-ignore-next}] Causes the next argument on the command line to be ignored. \item [\texttt{-parameter-level=<\var{level}>}] |