06-12-2014
Blockdev vs /sys/block/
Hello,
I want to set/get the read-ahead for my disks and there is a little issue that confuses me. There are three ways to get/set the read-ahead buffer:
1. cat /sys/block/md0/bdi/read_ahead_kb
2. cat /sys/block/md0/queue/read_ahead_kb
3. blockdev --getra /dev/md0
Which one is the correct one? The first two gives me a value of 128. The last one gives me a value of 256. Where does this difference come from?
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demux(1) General Commands Manual demux(1)
NAME
demux - Convert XPLOR distance restraints to Gromacs format
SYNOPSIS
demux md0.log extra
DESCRIPTION
If you would like to make your trajectories continuous again you can use demux to read your md0.log file (you can concatenate several if
necessary) and produce a few output files. One of these is a .xvg file (replica_ndx.xvg) that can be passed to trjcat(1) along with the
original trajectory files, in order to produce continuous trajectories. The other file (replica_temp.xvg) contains the temperatures for
each replica, starting at the original temperature. So if your replica of interest starts at, say, 300 K, you can follow its trajectory
through temperature space. It would be interesting to add some functionality to make histograms of temperature distributions for each
replica, which according to most authors, should be flat. The demuxed trajectories can be used with g_kinetics(1) to obtain protein folding
kinetics from REMD trajectories.
OPTIONS
md0.log Log file of the trajectory run you wish to make continuous. Multiple files can be appended together.
extra Number of times each entry in the log file will be copied. (Integer)
LIMITATIONS
If your exchange was every N ps and you saved every M ps you can make for the missing frames by setting extra to (N/M - 1). If N/M is not
integer, you're out of luck and you will not be able to demux your trajectories at all.
SEE ALSO
gromacs(7), trjcat(1), g_kinetics(1), <http://wiki.gromacs.org/index.php/REMD>
GROMACS suite, Version 4.0 13 Oct 2008 demux(1)