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Full Discussion: Named pipe performance
Top Forums Shell Programming and Scripting Named pipe performance Post 302554751 by alister on Tuesday 13th of September 2011 01:39:05 AM
Old 09-13-2011
To my knowledge, increasing the size of pipe and fifo (named pipe) buffers requires tweaking a header file and recompiling the kernel. The parameter in question is PIPE_BUF.

If you're using a recent linux, it's probably 64K. On an older linux, I believe it's 4K. On some other UNIX systems, it may be as low as 512 bytes (I believe this is the minimum allowed by POSIX).

You should be able to check the value with getconf PIPE_BUF pathname, where "pathname" is the path to the named pipe or the directory in which the named pipe will be located.

Regards,
Alister
Last edited by alister; 09-13-2011 at 02:54 AM..
 

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LEARN ABOUT CENTOS

struct_pipe_inode_info

STRUCT 
PIPE_INODE_IN(9) 					     pipes API						   STRUCT PIPE_INODE_IN(9)

NAME

       struct_pipe_inode_info - a linux kernel pipe

SYNOPSIS

       struct pipe_inode_info {
	 struct mutex mutex;
	 wait_queue_head_t wait;
	 unsigned int nrbufs;
	 unsigned int curbuf;
	 unsigned int buffers;
	 unsigned int readers;
	 unsigned int writers;
	 unsigned int files;
	 unsigned int waiting_writers;
	 unsigned int r_counter;
	 unsigned int w_counter;
	 struct page * tmp_page;
	 struct fasync_struct * fasync_readers;
	 struct fasync_struct * fasync_writers;
	 struct pipe_buffer * bufs;
       };

MEMBERS

       mutex
	   mutex protecting the whole thing

       wait
	   reader/writer wait point in case of empty/full pipe

       nrbufs
	   the number of non-empty pipe buffers in this pipe

       curbuf
	   the current pipe buffer entry

       buffers
	   total number of buffers (should be a power of 2)

       readers
	   number of current readers of this pipe

       writers
	   number of current writers of this pipe

       files
	   number of struct file refering this pipe (protected by ->i_lock)

       waiting_writers
	   number of writers blocked waiting for room

       r_counter
	   reader counter

       w_counter
	   writer counter

       tmp_page
	   cached released page

       fasync_readers
	   reader side fasync

       fasync_writers
	   writer side fasync

       bufs
	   the circular array of pipe buffers

COPYRIGHT

Kernel Hackers Manual 3.10					     June 2014						   STRUCT PIPE_INODE_IN(9)
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