Ejemplo n.º 1
0
def run_batch_on_fear(scripts,
                      language='python',
                      job_check_sleep=30,
                      file_copy_timeout=300,
                      max_jobs=500,
                      verbose=True,
                      zip_files=False):
    '''
    Receives a list of python scripts to run

    Assumes the code has an output file - i.e. %(output_file)s - that will be managed by this function
    
    Returns a list of local file names where the code has presumably stored output
    '''
    # Define some code constants
    #### TODO - this path adding code should accept an optional list of paths
    python_path_code = '''
import sys
sys.path.append('%s')
''' % REMOTE_PYTHON_PATH

    #### This will be deprecated in future MATLAB - hopefully the -singleCompThread command is sufficient
    #### TODO - No longer used? Remove?
    matlab_single_thread = '''
maxNumCompThreads(1);
'''

    matlab_path_code = '''
addpath(genpath('%s'))
''' % REMOTE_MATLAB_PATH

    #### TODO - allow port forwarding / tunneling - copy to machine on network with more disk space than fear, then copy from that machine?
    #### FIXME - Now does port forwarding but with fixed port numbers = bad
    #### TODO - Fix port forard leak
    if LOCATION == 'home':
        python_transfer_code = '''
from subprocess_timeout import timeoutCommand
import subprocess
print "Setting up port forwarding"
if subprocess.Popen("netstat -an | grep %(r2rport)d | grep LISTEN", shell=True, stdout=subprocess.PIPE).communicate()[0] == '':
    timeoutCommand(cmd='ssh -i %(rsa_remote)s -N -f -L %(r2rport)d:localhost:%(r2hport)d %(username)s@fear').run(timeout=%(timeout)d)
print "Moving output file"
if not timeoutCommand(cmd='scp -P %(r2rport)d -i %(rsa_home)s %(output_file)s %(home_user)s@localhost:%(local_temp_path)s; rm %(output_file)s').run(timeout=%(timeout)d)[0]:
    raise RuntimeError('Copying output raised error or timed out')
''' % {
            'rsa_remote': REMOTE_TO_REMOTE_KEY_FILE,
            'r2rport': REMOTE_TO_REMOTE_PORT,
            'r2hport': REMOTE_TO_HOME_PORT,
            'username': USERNAME,
            'timeout': file_copy_timeout,
            'rsa_home': REMOTE_TO_HOME_KEY_FILE,
            'output_file': '%(output_file)s',
            'home_user': HOME_USERNAME,
            'local_temp_path': HOME_TEMP_PATH
        }
    else:
        python_transfer_code = '''
#from util import timeoutCommand
from subprocess_timeout import timeoutCommand
print "Moving output file"
if not timeoutCommand(cmd='scp -i %(rsa_key)s %(output_file)s %(username)s@%(local_host)s:%(local_temp_path)s; rm %(output_file)s').run(timeout=%(timeout)d)[0]:
    raise RuntimeError('Copying output raised error or timed out')
''' % {
            'rsa_key': REMOTE_TO_LOCAL_KEY_FILE,
            'output_file': '%(output_file)s',
            'username': USERNAME,
            'local_host': LOCAL_HOST,
            'local_temp_path': LOCAL_TEMP_PATH,
            'timeout': file_copy_timeout
        }

    #### TODO - make this location independent
    #### TODO - does this suffer from the instabilities that lead to the verbosity of the python command above
    if LOCATION == 'home':
        matlab_transfer_code = '''
[status, result] = system('netstat -an | grep %(r2rport)d | grep LISTEN')
if isempty(strfind(result, 'LISTEN'))
  system('ssh -i %(rsa_remote)s -N -f -L %(r2rport)d:localhost:%(r2hport)d %(username)s@fear')
end
system('scp -o ConnectTimeout=%(timeout)d -P %(r2rport)d -i %(rsa_home)s %(output_file)s %(home_user)s@localhost:%(local_temp_path)s; rm %(output_file)s')
''' % {
            'rsa_remote': REMOTE_TO_REMOTE_KEY_FILE,
            'r2rport': REMOTE_TO_REMOTE_PORT,
            'r2hport': REMOTE_TO_HOME_PORT,
            'username': USERNAME,
            'timeout': file_copy_timeout,
            'rsa_home': REMOTE_TO_HOME_KEY_FILE,
            'output_file': '%(output_file)s',
            'home_user': HOME_USERNAME,
            'local_temp_path': HOME_TEMP_PATH
        }
    else:
        matlab_transfer_code = '''
system('scp -o ConnectTimeout=%(timeout)d -i %(rsa_key)s %(output_file)s %(username)s@%(local_host)s:%(local_temp_path)s; rm %(output_file)s')
''' % {
            'rsa_key': REMOTE_TO_LOCAL_KEY_FILE,
            'output_file': '%(output_file)s',
            'username': USERNAME,
            'timeout': file_copy_timeout,
            'local_host': LOCAL_HOST,
            'local_temp_path': LOCAL_TEMP_PATH
        }


#    python_completion_code = '''
#print 'Writing completion flag'
#with open('%(flag_file)s', 'w') as f:
#    f.write('Goodbye, World')
#print "I'll bite your legs off!"
#quit()
#'''
    python_completion_code = '''
print "I will bite your legs off!"
quit()
'''

    #### TODO - Is this completely stable
    #    matlab_completion_code = '''
    #fprintf('\\nWriting completion flag\\n');
    #ID = fopen('%(flag_file)s', 'w');
    #fprintf(ID, 'Goodbye, world');
    #fclose(ID);
    #fprintf('\\nGoodbye, World\\n');
    #quit()
    #'''
    matlab_completion_code = """
fprintf('\\nGoodbye, World\\n');
quit()
"""

    # Open a connection to fear as a with block - ensures connection is closed
    with pyfear.fear(via_gate=(LOCATION == 'home')) as fear:

        # Initialise lists of file locations job ids
        shell_files = [None] * len(scripts)
        script_files = [None] * len(scripts)
        output_files = [None] * len(scripts)
        stdout_files = [None] * len(scripts)
        flag_files = [None] * len(scripts)
        job_ids = [None] * len(scripts)
        fear_finished = False
        job_finished = [False] * len(scripts)

        # Modify all scripts and create local temporary files
        #### TODO - Writing to the network can be slow
        ####      - Perhaps it would be better writing to local disk followed by a block file transfer (is this possible?)
        ####      - Would make sense to do this when reading output files as well - perhaps this should be provided in this module?

        if LOCATION == 'local':
            temp_dir = LOCAL_TEMP_PATH
        else:
            temp_dir = HOME_TEMP_PATH

        if verbose:
            print 'Writing temporary files locally'
        for (i, code) in enumerate(scripts):
            if language == 'python':
                script_files[i] = mkstemp_safe(temp_dir, '.py')
            elif language == 'matlab':
                script_files[i] = mkstemp_safe(temp_dir, '.m')
            shell_files[i] = mkstemp_safe(temp_dir, '.sh')
            output_files[i] = mkstemp_safe(temp_dir, '.out')
            flag_files[i] = mkstemp_safe(temp_dir, '.flg')
            # Customise code (path, transfer of output back to local host, flag file writing)
            #### TODO - make path and output_transfer optional
            if language == 'python':
                code = python_path_code + code + python_transfer_code + python_completion_code
            elif language == 'matlab':
                code = matlab_path_code + code + matlab_transfer_code + matlab_completion_code
            #code = code % {'output_file': os.path.join(REMOTE_TEMP_PATH, os.path.split(output_files[i])[-1]),
            #               'flag_file' : os.path.join(REMOTE_TEMP_PATH, os.path.split(flag_files[i])[-1])}
            code = code % {
                'output_file':
                os.path.join(REMOTE_SCRATCH_PATH,
                             os.path.split(output_files[i])[-1])
            }
            # Write code and shell file
            with open(script_files[i], 'w') as f:
                f.write(code)
            with open(shell_files[i], 'w') as f:
                #### TODO - is os.path.join always correct - what happens if this program is being run on windows?
                if language == 'python':
                    f.write('python ' +
                            os.path.join(REMOTE_TEMP_PATH,
                                         os.path.split(script_files[i])[-1]) +
                            '\n')
                elif language == 'matlab':
                    f.write('cd ' + REMOTE_TEMP_PATH + ';\n' + REMOTE_MATLAB + ' -nosplash -nojvm -nodisplay -singleCompThread -r ' + \
                            os.path.split(script_files[i])[-1].split('.')[0] + '\n')

        # Zip and send files

        if zip_files:
            if verbose:
                print 'Zipping files'
            zip_file_name = mkstemp_safe(temp_dir, '.zip')
            zf = zipfile.ZipFile(zip_file_name, mode='w')
            for script in script_files:
                zf.write(script,
                         arcname=(os.path.split(script)[-1]),
                         compress_type=zipfile.ZIP_DEFLATED)
            for shell in shell_files:
                zf.write(shell,
                         arcname=(os.path.split(shell)[-1]),
                         compress_type=zipfile.ZIP_DEFLATED)
            zf.close()
            if verbose:
                print 'Sending zip file to fear'
            fear.copy_to_temp(zip_file_name)
            if verbose:
                print 'Unzipping on fear'
            fear.command(
                'cd %(temp_path)s ; unzip %(zip_file)s ; rm %(zip_file)s' % {
                    'temp_path': REMOTE_TEMP_PATH,
                    'zip_file': os.path.split(zip_file_name)[-1]
                })

        # Loop through jobs, submitting jobs whenever fear usage low enough, re-submitting failed jobs
        print 'Submitting %d jobs' % len(scripts)
        while not fear_finished:
            # Update knowledge of fear - trying to limit communication
            fear.qstat()
            jobs_alive = fear.jobs_alive(update=False)
            # Sleep unless anything happens
            should_sleep = True
            for i in range(len(scripts)):  # Make me more pythonic with zipping
                #fear.qstat()
                #jobs_alive = fear.jobs_alive(update=False)
                # Does the job need to be run and can we run it?
                if (not job_finished[i]) and (job_ids[i] is None) and (
                        jobs_alive <= max_jobs):
                    # Something has happened
                    should_sleep = False
                    # Transfer files to fear
                    if not zip_files:
                        fear.copy_to_temp(script_files[i])
                        fear.copy_to_temp(shell_files[i])
                    # Submit the job to fear
                    if verbose:
                        print 'Submitting job %d of %d' % (i + 1,
                                                           len(scripts)),
                    job_ids[i] = fear.qsub(
                        os.path.join(REMOTE_TEMP_PATH,
                                     os.path.split(shell_files[i])[-1]),
                        verbose=verbose)  # Hide path constant
                    # Increment job count
                    jobs_alive += 1

                #### FIXME - This was an attempt at better utilisation of fear - back fired since calling qstat is slow - correct solution is to have job sending and job completion checking in different threads - but would need to be carerful with the shared lists

                #for j in range(len(scripts)):
                #    if (not job_finished[j]) and (job_ids[j] is None) and (jobs_alive <= max_jobs):
                #        # Something has happened
                #        should_sleep = False
                #        # Transfer files to fear
                #        if not zip_files:
                #            fear.copy_to_temp(script_files[j])
                #            fear.copy_to_temp(shell_files[j])
                #        # Submit the job to fear
                #        print 'Submitting job %d of %d' % (j + 1, len(scripts))
                #        job_ids[j] = fear.qsub(os.path.join(REMOTE_TEMP_PATH, os.path.split(shell_files[j])[-1]), verbose=verbose) # Hide path constant
                #        # Increment job count
                #        jobs_alive += 1

                # Otherwise was it running last we checked?
                elif (not job_finished[i]) and (not job_ids[i] is None):
                    #if (not job_finished[i]) and (not job_ids[i] is None):
                    # Has the process terminated?
                    if fear.job_terminated(job_ids[i], update=False):
                        # Decrement job count
                        #jobs_alive -= 1 - would not have been counted earlier
                        should_sleep = False
                        # Has the job failed to write a flag or is the output file empty
                        #### FIXME - If LOCATION=='home' need to check .out file on local is non-empty
                        #### TODO - Can likely increase speed by checking status of files (on fear and local) in one block - not sure how to do it though
                        ####      - In particular checking for file existence should probably be done with a SFTP client rather than SSH - might be faster?
                        #if (not fear.file_exists(os.path.join(REMOTE_TEMP_PATH, os.path.split(flag_files[i])[-1]))) or \
                        #   (os.stat(output_files[i]).st_size == 0):
                        if (os.stat(output_files[i]).st_size == 0):
                            # Job has finished but missing output - resubmit later
                            print 'Shell script %s job_id %s failed' % (
                                os.path.split(shell_files[i])[-1], job_ids[i])
                            # Save job id for file deletion
                            old_job_id = job_ids[i]
                            job_ids[i] = None
                        else:
                            # Job has finished successfully
                            job_finished[i] = True
                            # Save job id for file deletion
                            old_job_id = job_ids[i]
                            # Move files if necessary
                            #if LOCATION=='home':
                            #    # Copy the file from local storage machine (and delete it)
                            #    fear.copy_from_localhost(localpath=output_files[i], remotepath=os.path.join(LOCAL_TEMP_PATH, os.path.split(output_files[i])[-1]))
                            # Tell the world
                            if verbose:
                                print '%d / %d jobs complete' % (
                                    sum(job_finished), len(job_finished))
                            # Tidy up local temporary directory - actually - do this in one batch later
                            #os.remove(script_files[i])
                            #os.remove(shell_files[i])
                            #os.remove(flag_files[i])
                        # Tidy up fear
                        fear.rm(
                            os.path.join(REMOTE_TEMP_PATH,
                                         os.path.split(script_files[i])[-1]))
                        fear.rm(
                            os.path.join(REMOTE_TEMP_PATH,
                                         os.path.split(shell_files[i])[-1]))
                        #fear.rm(os.path.join(REMOTE_TEMP_PATH, os.path.split(flag_files[i])[-1]))
                        #### TODO - record the output and error files for future reference
                        fear.rm(
                            os.path.join(REMOTE_TEMP_PATH,
                                         os.path.split(shell_files[i])[-1]) +
                            ('.o%s' % old_job_id))
                        fear.rm(
                            os.path.join(REMOTE_TEMP_PATH,
                                         os.path.split(shell_files[i])[-1]) +
                            ('.e%s' % old_job_id))
                        #### TODO - is the following line faster?
                        #fear.command('rm ' + ' ; rm '.join([os.path.join(REMOTE_TEMP_PATH, os.path.split(script_files[i])[-1]), os.path.join(REMOTE_TEMP_PATH, os.path.split(shell_files[i])[-1]), os.path.join(REMOTE_TEMP_PATH, os.path.split(flag_files[i])[-1]), os.path.join(REMOTE_TEMP_PATH, os.path.split(shell_files[i])[-1]) + ('.o%s' % old_job_id), os.path.join(REMOTE_TEMP_PATH, os.path.split(shell_files[i])[-1]) + ('.e%s' % old_job_id)]))
                        # Tidy up local temporary directory
                        #os.remove(script_files[i])
                        #os.remove(shell_files[i])
                        #os.remove(flag_files[i])
                        job_ids[i] = None

                    elif not (fear.job_queued(job_ids[i]) or fear.job_running(job_ids[i]) \
                              or fear.job_loading(job_ids[i])):
                        # Job has some status other than running, queuing or loading - something is wrong, delete it
                        jobs_alive -= 1
                        should_sleep = False
                        old_job_id = job_ids[i]
                        fear.qdel(job_ids[i])
                        print 'Shell script %s job_id %s stuck, deleting' % (
                            os.path.split(shell_files[i])[-1], job_ids[i])
                        #### TODO - remove this code duplication
                        # Tidy up fear
                        fear.rm(
                            os.path.join(REMOTE_TEMP_PATH,
                                         os.path.split(script_files[i])[-1]))
                        fear.rm(
                            os.path.join(REMOTE_TEMP_PATH,
                                         os.path.split(shell_files[i])[-1]))
                        # fear.rm(os.path.join(REMOTE_TEMP_PATH, os.path.split(flag_files[i])[-1]))
                        #### TODO - record the output and error files for future reference
                        fear.rm(
                            os.path.join(REMOTE_TEMP_PATH,
                                         os.path.split(shell_files[i])[-1]) +
                            ('.o%s' % old_job_id))
                        fear.rm(
                            os.path.join(REMOTE_TEMP_PATH,
                                         os.path.split(shell_files[i])[-1]) +
                            ('.e%s' % old_job_id))
                        #### TODO - is the following line faster?
                        #fear.command('rm ' + ' ; rm '.join([os.path.join(REMOTE_TEMP_PATH, os.path.split(script_files[i])[-1]), os.path.join(REMOTE_TEMP_PATH, os.path.split(shell_files[i])[-1]), os.path.join(REMOTE_TEMP_PATH, os.path.split(flag_files[i])[-1]), os.path.join(REMOTE_TEMP_PATH, os.path.split(shell_files[i])[-1]) + ('.o%s' % old_job_id), os.path.join(REMOTE_TEMP_PATH, os.path.split(shell_files[i])[-1]) + ('.e%s' % old_job_id)]))
                        # Tidy up local temporary directory
                        #os.remove(script_files[i])
                        #os.remove(shell_files[i])
                        #os.remove(flag_files[i])
                        job_ids[i] = None
            if all(job_finished):
                fear_finished = True
            elif should_sleep:
                print '%d of %d jobs complete' % (sum(job_finished),
                                                  len(job_finished))
                if verbose:
                    #fear.qstat()
                    print '%d jobs running' % fear.jobs_running(update=False)
                    print '%d jobs loading' % fear.jobs_loading(update=False)
                    print '%d jobs queued' % fear.jobs_queued(update=False)
                    #print 'Sleeping for %d seconds' % job_check_sleep
                time.sleep(job_check_sleep)

    # Tidy up temporary directory
    if verbose:
        print 'Removing temporary files'
    for i in range(len(scripts)):
        os.remove(script_files[i])
        os.remove(shell_files[i])
        os.remove(flag_files[i])
    if zip_files:
        os.remove(zip_file_name)

    #### TODO - return job output and error files as applicable (e.g. there may be multiple error files associated with one script)
    return output_files
Ejemplo n.º 2
0
def run_batch_on_fear(scripts, language='python', job_check_sleep=30, file_copy_timeout=300, max_jobs=500, verbose=True, zip_files=False):
    '''
    Receives a list of python scripts to run

    Assumes the code has an output file - i.e. %(output_file)s - that will be managed by this function
    
    Returns a list of local file names where the code has presumably stored output
    '''
    # Define some code constants
    #### TODO - this path adding code should accept an optional list of paths
    python_path_code = '''
import sys
sys.path.append('%s')
''' % REMOTE_PYTHON_PATH

    #### This will be deprecated in future MATLAB - hopefully the -singleCompThread command is sufficient
    #### TODO - No longer used? Remove?
    matlab_single_thread = '''
maxNumCompThreads(1);
'''

    matlab_path_code = '''
addpath(genpath('%s'))
''' % REMOTE_MATLAB_PATH
    
    #### TODO - allow port forwarding / tunneling - copy to machine on network with more disk space than fear, then copy from that machine?
    #### FIXME - Now does port forwarding but with fixed port numbers = bad
    #### TODO - Fix port forard leak
    if LOCATION == 'home':
        python_transfer_code = '''
from subprocess_timeout import timeoutCommand
import subprocess
print "Setting up port forwarding"
if subprocess.Popen("netstat -an | grep %(r2rport)d | grep LISTEN", shell=True, stdout=subprocess.PIPE).communicate()[0] == '':
    timeoutCommand(cmd='ssh -i %(rsa_remote)s -N -f -L %(r2rport)d:localhost:%(r2hport)d %(username)s@fear').run(timeout=%(timeout)d)
print "Moving output file"
if not timeoutCommand(cmd='scp -P %(r2rport)d -i %(rsa_home)s %(output_file)s %(home_user)s@localhost:%(local_temp_path)s; rm %(output_file)s').run(timeout=%(timeout)d)[0]:
    raise RuntimeError('Copying output raised error or timed out')
''' % {'rsa_remote' : REMOTE_TO_REMOTE_KEY_FILE,
       'r2rport' : REMOTE_TO_REMOTE_PORT,
       'r2hport' : REMOTE_TO_HOME_PORT,
       'username' : USERNAME,
       'timeout' : file_copy_timeout,
       'rsa_home' : REMOTE_TO_HOME_KEY_FILE,
       'output_file' : '%(output_file)s',
       'home_user' : HOME_USERNAME,
       'local_temp_path' : HOME_TEMP_PATH}
    else:    
        python_transfer_code = '''
#from util import timeoutCommand
from subprocess_timeout import timeoutCommand
print "Moving output file"
if not timeoutCommand(cmd='scp -i %(rsa_key)s %(output_file)s %(username)s@%(local_host)s:%(local_temp_path)s; rm %(output_file)s').run(timeout=%(timeout)d)[0]:
    raise RuntimeError('Copying output raised error or timed out')
''' % {'rsa_key' : REMOTE_TO_LOCAL_KEY_FILE,
       'output_file' : '%(output_file)s',
       'username' : USERNAME,
       'local_host' : LOCAL_HOST,
       'local_temp_path' : LOCAL_TEMP_PATH,
       'timeout' : file_copy_timeout}
    
    #### TODO - make this location independent
    #### TODO - does this suffer from the instabilities that lead to the verbosity of the python command above
    if LOCATION == 'home':
        matlab_transfer_code = '''
[status, result] = system('netstat -an | grep %(r2rport)d | grep LISTEN')
if isempty(strfind(result, 'LISTEN'))
  system('ssh -i %(rsa_remote)s -N -f -L %(r2rport)d:localhost:%(r2hport)d %(username)s@fear')
end
system('scp -o ConnectTimeout=%(timeout)d -P %(r2rport)d -i %(rsa_home)s %(output_file)s %(home_user)s@localhost:%(local_temp_path)s; rm %(output_file)s')
''' % {'rsa_remote' : REMOTE_TO_REMOTE_KEY_FILE,
       'r2rport' : REMOTE_TO_REMOTE_PORT,
       'r2hport' : REMOTE_TO_HOME_PORT,
       'username' : USERNAME,
       'timeout' : file_copy_timeout,
       'rsa_home' : REMOTE_TO_HOME_KEY_FILE,
       'output_file' : '%(output_file)s',
       'home_user' : HOME_USERNAME,
       'local_temp_path' : HOME_TEMP_PATH}
    else:
        matlab_transfer_code = '''
system('scp -o ConnectTimeout=%(timeout)d -i %(rsa_key)s %(output_file)s %(username)s@%(local_host)s:%(local_temp_path)s; rm %(output_file)s')
''' % {'rsa_key' : REMOTE_TO_LOCAL_KEY_FILE,
       'output_file' : '%(output_file)s',
       'username' : USERNAME,
       'timeout' : file_copy_timeout,
       'local_host' : LOCAL_HOST,
       'local_temp_path' : LOCAL_TEMP_PATH}
       
#    python_completion_code = '''
#print 'Writing completion flag'
#with open('%(flag_file)s', 'w') as f:
#    f.write('Goodbye, World')
#print "I'll bite your legs off!"
#quit()
#'''       
    python_completion_code = '''
print "I will bite your legs off!"
quit()
'''
  
    #### TODO - Is this completely stable       
#    matlab_completion_code = '''
#fprintf('\\nWriting completion flag\\n');
#ID = fopen('%(flag_file)s', 'w');
#fprintf(ID, 'Goodbye, world');
#fclose(ID);
#fprintf('\\nGoodbye, World\\n');
#quit()
#'''
    matlab_completion_code = """
fprintf('\\nGoodbye, World\\n');
quit()
"""
    
    # Open a connection to fear as a with block - ensures connection is closed
    with pyfear.fear(via_gate=(LOCATION=='home')) as fear:
    
        # Initialise lists of file locations job ids
        shell_files = [None] * len(scripts)
        script_files = [None] * len(scripts)
        output_files = [None] * len(scripts)
        stdout_files = [None] * len(scripts)
        flag_files = [None] * len(scripts)
        job_ids = [None] * len(scripts) 
        fear_finished = False
        job_finished = [False] * len(scripts) 
        
        # Modify all scripts and create local temporary files
        #### TODO - Writing to the network can be slow
        ####      - Perhaps it would be better writing to local disk followed by a block file transfer (is this possible?)
        ####      - Would make sense to do this when reading output files as well - perhaps this should be provided in this module?
        
        if LOCATION == 'local':
            temp_dir = LOCAL_TEMP_PATH
        else:
            temp_dir = HOME_TEMP_PATH

        if verbose:
            print 'Writing temporary files locally'
        for (i, code) in enumerate(scripts):
            if language == 'python':
                script_files[i] = mkstemp_safe(temp_dir, '.py')
            elif language == 'matlab':
                script_files[i] = mkstemp_safe(temp_dir, '.m')
            shell_files[i] = mkstemp_safe(temp_dir, '.sh')
            output_files[i] = mkstemp_safe(temp_dir, '.out')
            flag_files[i] = mkstemp_safe(temp_dir, '.flg')
            # Customise code (path, transfer of output back to local host, flag file writing)
            #### TODO - make path and output_transfer optional
            if language == 'python':
                code = python_path_code + code + python_transfer_code + python_completion_code
            elif language == 'matlab':
                code = matlab_path_code + code + matlab_transfer_code + matlab_completion_code
            #code = code % {'output_file': os.path.join(REMOTE_TEMP_PATH, os.path.split(output_files[i])[-1]),
            #               'flag_file' : os.path.join(REMOTE_TEMP_PATH, os.path.split(flag_files[i])[-1])}
            code = code % {'output_file': os.path.join(REMOTE_SCRATCH_PATH, os.path.split(output_files[i])[-1])}
            # Write code and shell file
            with open(script_files[i], 'w') as f:
                f.write(code)
            with open(shell_files[i], 'w') as f:
                #### TODO - is os.path.join always correct - what happens if this program is being run on windows?
                if language == 'python':
                    f.write('python ' + os.path.join(REMOTE_TEMP_PATH, os.path.split(script_files[i])[-1]) + '\n')
                elif language == 'matlab':
                    f.write('cd ' + REMOTE_TEMP_PATH + ';\n' + REMOTE_MATLAB + ' -nosplash -nojvm -nodisplay -singleCompThread -r ' + \
                            os.path.split(script_files[i])[-1].split('.')[0] + '\n')

        # Zip and send files

        if zip_files:
            if verbose:
                print 'Zipping files'
            zip_file_name = mkstemp_safe(temp_dir, '.zip')
            zf = zipfile.ZipFile(zip_file_name, mode='w')
            for script in script_files:
                zf.write(script, arcname=(os.path.split(script)[-1]), compress_type=zipfile.ZIP_DEFLATED)
            for shell in shell_files:
                zf.write(shell, arcname=(os.path.split(shell)[-1]), compress_type=zipfile.ZIP_DEFLATED)
            zf.close()
            if verbose:
                print 'Sending zip file to fear'
            fear.copy_to_temp(zip_file_name)
            if verbose:
                print 'Unzipping on fear'
            fear.command('cd %(temp_path)s ; unzip %(zip_file)s ; rm %(zip_file)s' % {'temp_path' : REMOTE_TEMP_PATH, 'zip_file' : os.path.split(zip_file_name)[-1]})

        # Loop through jobs, submitting jobs whenever fear usage low enough, re-submitting failed jobs
        print 'Submitting %d jobs' % len(scripts)
        while not fear_finished:
            # Update knowledge of fear - trying to limit communication
            fear.qstat()
            jobs_alive = fear.jobs_alive(update=False)
            # Sleep unless anything happens
            should_sleep = True
            for i in range(len(scripts)): # Make me more pythonic with zipping
                #fear.qstat()
                #jobs_alive = fear.jobs_alive(update=False)
                # Does the job need to be run and can we run it?
                if (not job_finished[i]) and (job_ids[i] is None) and (jobs_alive <= max_jobs):
                    # Something has happened
                    should_sleep = False
                    # Transfer files to fear
                    if not zip_files:
                        fear.copy_to_temp(script_files[i])
                        fear.copy_to_temp(shell_files[i])
                    # Submit the job to fear
                    if verbose:
                        print 'Submitting job %d of %d' % (i + 1, len(scripts)),
                    job_ids[i] = fear.qsub(os.path.join(REMOTE_TEMP_PATH, os.path.split(shell_files[i])[-1]), verbose=verbose) # Hide path constant
                    # Increment job count
                    jobs_alive += 1

                #### FIXME - This was an attempt at better utilisation of fear - back fired since calling qstat is slow - correct solution is to have job sending and job completion checking in different threads - but would need to be carerful with the shared lists

                #for j in range(len(scripts)):
                #    if (not job_finished[j]) and (job_ids[j] is None) and (jobs_alive <= max_jobs):
                #        # Something has happened
                #        should_sleep = False
                #        # Transfer files to fear
                #        if not zip_files:
                #            fear.copy_to_temp(script_files[j])
                #            fear.copy_to_temp(shell_files[j])
                #        # Submit the job to fear
                #        print 'Submitting job %d of %d' % (j + 1, len(scripts))
                #        job_ids[j] = fear.qsub(os.path.join(REMOTE_TEMP_PATH, os.path.split(shell_files[j])[-1]), verbose=verbose) # Hide path constant
                #        # Increment job count
                #        jobs_alive += 1

                # Otherwise was it running last we checked?
                elif (not job_finished[i]) and (not job_ids[i] is None):
                #if (not job_finished[i]) and (not job_ids[i] is None):
                    # Has the process terminated?
                    if fear.job_terminated(job_ids[i], update=False):
                        # Decrement job count
                        #jobs_alive -= 1 - would not have been counted earlier
                        should_sleep = False
                        # Has the job failed to write a flag or is the output file empty
                        #### FIXME - If LOCATION=='home' need to check .out file on local is non-empty
                        #### TODO - Can likely increase speed by checking status of files (on fear and local) in one block - not sure how to do it though
                        ####      - In particular checking for file existence should probably be done with a SFTP client rather than SSH - might be faster?
                        #if (not fear.file_exists(os.path.join(REMOTE_TEMP_PATH, os.path.split(flag_files[i])[-1]))) or \
                        #   (os.stat(output_files[i]).st_size == 0):
                        if (os.stat(output_files[i]).st_size == 0):
                            # Job has finished but missing output - resubmit later
                            print 'Shell script %s job_id %s failed' % (os.path.split(shell_files[i])[-1], job_ids[i])
                            # Save job id for file deletion
                            old_job_id = job_ids[i]
                            job_ids[i] = None
                        else:
                            # Job has finished successfully
                            job_finished[i] = True
                            # Save job id for file deletion
                            old_job_id = job_ids[i]
                            # Move files if necessary
                            #if LOCATION=='home':
                            #    # Copy the file from local storage machine (and delete it)
                            #    fear.copy_from_localhost(localpath=output_files[i], remotepath=os.path.join(LOCAL_TEMP_PATH, os.path.split(output_files[i])[-1]))
                            # Tell the world
                            if verbose:
                                print '%d / %d jobs complete' % (sum(job_finished), len(job_finished))
                            # Tidy up local temporary directory - actually - do this in one batch later
                            #os.remove(script_files[i])
                            #os.remove(shell_files[i])
                            #os.remove(flag_files[i])
                        # Tidy up fear
                        fear.rm(os.path.join(REMOTE_TEMP_PATH, os.path.split(script_files[i])[-1]))
                        fear.rm(os.path.join(REMOTE_TEMP_PATH, os.path.split(shell_files[i])[-1]))
                        #fear.rm(os.path.join(REMOTE_TEMP_PATH, os.path.split(flag_files[i])[-1]))
                        #### TODO - record the output and error files for future reference
                        fear.rm(os.path.join(REMOTE_TEMP_PATH, os.path.split(shell_files[i])[-1]) + ('.o%s' % old_job_id))
                        fear.rm(os.path.join(REMOTE_TEMP_PATH, os.path.split(shell_files[i])[-1]) + ('.e%s' % old_job_id))
                        #### TODO - is the following line faster?
                        #fear.command('rm ' + ' ; rm '.join([os.path.join(REMOTE_TEMP_PATH, os.path.split(script_files[i])[-1]), os.path.join(REMOTE_TEMP_PATH, os.path.split(shell_files[i])[-1]), os.path.join(REMOTE_TEMP_PATH, os.path.split(flag_files[i])[-1]), os.path.join(REMOTE_TEMP_PATH, os.path.split(shell_files[i])[-1]) + ('.o%s' % old_job_id), os.path.join(REMOTE_TEMP_PATH, os.path.split(shell_files[i])[-1]) + ('.e%s' % old_job_id)]))
                        # Tidy up local temporary directory
                        #os.remove(script_files[i])
                        #os.remove(shell_files[i])
                        #os.remove(flag_files[i])    
                        job_ids[i] = None                     
                            
                    elif not (fear.job_queued(job_ids[i]) or fear.job_running(job_ids[i]) \
                              or fear.job_loading(job_ids[i])):
                        # Job has some status other than running, queuing or loading - something is wrong, delete it
                        jobs_alive -= 1
                        should_sleep = False
                        old_job_id = job_ids[i]
                        fear.qdel(job_ids[i])
                        print 'Shell script %s job_id %s stuck, deleting' % (os.path.split(shell_files[i])[-1], job_ids[i])
                        #### TODO - remove this code duplication
                        # Tidy up fear
                        fear.rm(os.path.join(REMOTE_TEMP_PATH, os.path.split(script_files[i])[-1]))
                        fear.rm(os.path.join(REMOTE_TEMP_PATH, os.path.split(shell_files[i])[-1]))
                        # fear.rm(os.path.join(REMOTE_TEMP_PATH, os.path.split(flag_files[i])[-1]))
                        #### TODO - record the output and error files for future reference
                        fear.rm(os.path.join(REMOTE_TEMP_PATH, os.path.split(shell_files[i])[-1]) + ('.o%s' % old_job_id))
                        fear.rm(os.path.join(REMOTE_TEMP_PATH, os.path.split(shell_files[i])[-1]) + ('.e%s' % old_job_id))
                        #### TODO - is the following line faster?
                        #fear.command('rm ' + ' ; rm '.join([os.path.join(REMOTE_TEMP_PATH, os.path.split(script_files[i])[-1]), os.path.join(REMOTE_TEMP_PATH, os.path.split(shell_files[i])[-1]), os.path.join(REMOTE_TEMP_PATH, os.path.split(flag_files[i])[-1]), os.path.join(REMOTE_TEMP_PATH, os.path.split(shell_files[i])[-1]) + ('.o%s' % old_job_id), os.path.join(REMOTE_TEMP_PATH, os.path.split(shell_files[i])[-1]) + ('.e%s' % old_job_id)]))
                        # Tidy up local temporary directory
                        #os.remove(script_files[i])
                        #os.remove(shell_files[i])
                        #os.remove(flag_files[i])    
                        job_ids[i] = None   
            if all(job_finished):
                fear_finished = True    
            elif should_sleep:
                print '%d of %d jobs complete' % (sum(job_finished), len(job_finished))
                if verbose:
                    #fear.qstat()
                    print '%d jobs running' % fear.jobs_running(update=False)
                    print '%d jobs loading' % fear.jobs_loading(update=False)
                    print '%d jobs queued' % fear.jobs_queued(update=False)
                    #print 'Sleeping for %d seconds' % job_check_sleep
                time.sleep(job_check_sleep)

    # Tidy up temporary directory
    if verbose:
        print 'Removing temporary files'
    for i in range(len(scripts)):
        os.remove(script_files[i])
        os.remove(shell_files[i])
        os.remove(flag_files[i])
    if zip_files:
        os.remove(zip_file_name)

    #### TODO - return job output and error files as applicable (e.g. there may be multiple error files associated with one script)
    return output_files