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Full Discussion: Get lines in 5 seconds
Top Forums Shell Programming and Scripting Get lines in 5 seconds Post 75131 by jim mcnamara on Wednesday 15th of June 2005 01:44:59 PM
Old 06-15-2005
File writes do not always work the way you think they do.

Unless the process writing the file calls fflush() for every line or is using aio calls, the kernel accumulates file data in memory for a while, then writes a bunch of stuff all at once to the file. The bunch of stuff it decides to write may end somewhere in the middle of a line.

What this means is that you could wait for 20 seconds, while nothing is written to the file. Then during the 21st second, 8192 bytes of data is written to the file.
 

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LEARN ABOUT DEBIAN

aio

AIO(4)							   BSD Kernel Interfaces Manual 						    AIO(4)

NAME

     aio -- asynchronous I/O

SYNOPSIS

     To link into the kernel:
     options VFS_AIO

     To load as a kernel loadable module:
	   kldload aio

DESCRIPTION

     The aio facility provides system calls for asynchronous I/O.  It is available both as a kernel option for static inclusion and as a dynamic
     kernel module.

SEE ALSO

     aio_cancel(2), aio_error(2), aio_read(2), aio_return(2), aio_suspend(2), aio_waitcomplete(2), aio_write(2), lio_listio(2), config(8),
     kldload(8), kldunload(8)

HISTORY

     The aio facility appeared as a kernel option in FreeBSD 3.0.  The aio kernel module appeared in FreeBSD 5.0.

BSD
								 October 24, 2002							       BSD
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