Bob Friesenhahn wrote: > On Fri, 10 Jul 2009, Roland Mainz wrote: > > Does anyone know where the default buffer size for pipes (e.g. $ ulimit > > -p #) is defined and how it can be changed (or turned into a system > > tuneable) ? The current default of 5120 bytes is AFAIK not always > > optimal (originally defined when systems only had single-byte locales, > > with the rise of multibyte locales the number of _characters_ which can > > be buffered shrunk a lot) and a larger buffer size may be nice... > > Some applications may misbehave or lock-up if the size of the pipe > buffer is changed.
Erm... why ? > It seems rather dangerous to change it > system-wide. Well, my final goal was to make it an rlimit tuneable (e.g. $ ulimit -p <newpipesize> #) ... in the meantime I found that the fifofs (pipes go through fifofs) simply uses |PIPE_BUF| which is defined as |5120| ... ... the question is now whether we can add a new member to |fifonode_t| which is initalised based on the rlimit values and used instead of the hardcoded |PIPE_BUF|. ---- Bye, Roland -- __ . . __ (o.\ \/ /.o) roland.ma...@nrubsig.org \__\/\/__/ MPEG specialist, C&&JAVA&&Sun&&Unix programmer /O /==\ O\ TEL +49 641 3992797 (;O/ \/ \O;) _______________________________________________ perf-discuss mailing list perf-discuss@opensolaris.org
