#!/bin/sh

# ================================================================
# This script runs Tom Kennedy's simul_saw_bridge, with input parameters in
# this script file, and output redirected to a specified output file.  This
# makes it possible to run simul_saw_bridge in the background on a compute
# server, rather than from an interactive session.
#
# Sample usage:
#
#   ssh chivo1   (or chivo2, chivo3, chivo4)
#   cd {your directory where these files are}
#   ./wrapper.sh &
#   logout
#
# Save this file as wrapper.sh, then
#   chmod +x wrapper.sh
# That will make it executable.
#
# ================================================================
# John Kerl
# kerl.john.r@gmail.com
# 2009-08-12
# ================================================================

# Edit the following parameters to taste.
mailto="kerl@math.arizona.edu"
output_file="myoutput.txt"

junkdata_name=junkdata
passright_name=passright
RNG_seed=-1
num_walk_steps=100000
FWSAW_flag=1
nsimplify=0
max_num_bridge=100
nsample=100000
bridge_type=1
height=0.2
endpoint_or_walk=0

# ----------------------------------------------------------------
# From here on down, you shouldn't need to change.

# FYI:
#
# * The @@@ business is called a "here document" in shell-scripting jargon.
#   This allows us to specify input parameters without having to type them
#   manually.
#
# * The > redirects output to the specified file, instead of the terminal.
#
# * The 2>&1 sends stderr to the same file as stdout.
#
# * nice -10 reduces the compute job's scheduling priority.
#
# * nohup means the program will keep running after you log out ("hang up").

host_name=`hostname`
start_time="`date`"

nohup nice -10 simul_saw_bridge > $output_file  2>&1 <<@@@
$junkdata_name
$passright_name
$RNG_seed
$num_walk_steps
$FWSAW_flag
$nsimplify
$max_num_bridge
$nsample
$bridge_type
$height
$endpoint_or_walk
@@@

end_time="`date`"

mail -s "Compute job complete." $mailto <<@@@
Host:        $host_name
Start time:  $start_time
End time:    $end_time
Output file: $output_file
@@@

# ----------------------------------------------------------------
# Example of running simul_saw_bridge interactively:
# kerl@mundt:bridges% simul_saw_bridge
# Enter name of file in which to store data (junkdata)
# junkdata
# Enter name of file in which to store pass right array (passright)
# passright
# seed for random number generator (-1)
# -1
# number of steps in the walk (100000)
# 100000
# 1 for strictly or 2 for weakly or 3 for FWSAW (1)
# 1
# nsimplify (0)
# 0
# max_num_bridge	(100)
# 100
# nsample (100000)
# 100000
# bridge type, 1=horizontal line, 2=circle, -2=circle for full plane (1)
# 1
# height	(0.2)
# 0.2
# just endpoint or walk? 0=endpt, 1=walk	(0)
# 0
# clock generated seed=435707
# nsteps=100000
# Initial walk has turn fraction 0.607606
# >>>>>>>>> 1 -1 0 2.011603 secs <<<<<<<
# >>>>>>>>> 2 -1 0 3.964455 secs <<<<<<<
# ...