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--- cluster:124 [2013/10/31 17:56]
hmeij
+++ cluster:124 [2016/03/11 20:14] (current)
hmeij07
@@ Line 1: / Line 1: @@
 \\
 **[[cluster:0|Back]]**
+Queue ''tinymem'' supports BLCR
+ --- //[[hmeij@wesleyan.edu|Henk]] 2016/03/03 13:57//
+Adjust your PATH and LD_LIBRARY_PATH accordingly.
 ==== BLCR ====
@@ Line 39: / Line 44: @@
 ...
-# and here is our application and output
+# and here is our application and output (one extra character per second)
 [hmeij@n33 blcr]$ ./t-20001030-01
 *
@@ Line 50: / Line 55: @@
 </code>
+So now lets run this under BLCR and observe what happens.  After we define the proper environment, we use ''cr_run'' to launch our application. Standard output and error are written into the output file ''context''. We then observe the PID of our process and use ''cr_checkpoint'' to write a checkpoint file and immediately terminate the process.
+<code>
+# start application
 [hmeij@n33 blcr]$ cr_run ./t-20001030-01 > context 2>&1 &
 [1] 12789
+# observe PID
 [hmeij@n33 blcr]$ ps
   PID TTY          TIME CMD
@@ Line 59: / Line 70: @@
 pts/29   00:00:00 bash
+# wait, then checkpoint and terminate process
 [hmeij@n33 blcr]$ sleep 30
 [hmeij@n33 blcr]$ cr_checkpoint --term 12789
 [1]+  Terminated              cr_run ./t-20001030-01 > context 2>&1
+# save the output
 [hmeij@n33 blcr]$ mv context context.save
+</code>
+Ok.  Next we use ''cr_restart'' to restart our application by pointing it to the checkpoint file generated.  Then we'll wait a bit and terminate the restart.
+<code>
+# restart in background
 [hmeij@n33 blcr]$ cr_restart ./context.12789 > context 2>&1 &
 [1] 13579
+# wait and terminate the restart
 [hmeij@n33 blcr]$ sleep 30
 [hmeij@n33 blcr]$ kill %1
 [1]+  Terminated              cr_restart ./context.12789 > context 2>&1
+</code>
+So what we're interested in is the boundary between first termination and subsequent restart.  It alooks like this:
+<code>
 [hmeij@n33 blcr]$ tail context.save
@@ Line 95: / Line 122: @@
 ************************************************************
-^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@
+# pretty nifty!
-^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@
+# but be forewarned that there are binary characters lurking at this boundary
-^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@
+# you can strip them out with ''sed'' or ''tr''
-^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@
+# it looks like this
-^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@
-^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@
-^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@
-^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@
-^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@
-^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@
-^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@
-^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@
-^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@
-^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@
-^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@
-^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@
-^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@
-^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@
-^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@
-^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@
-^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@
-^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@***************************************************
+^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@***************************************************
-[hmeij@n33 blcr]$ ./run.serial&
+</code>
-[1] 2082
-[hmeij@n33 blcr]$ process_id=2084
-sleep 140; kill 2084
-[hmeij@n33 blcr]$ ./run.serial: line 24:  2084 Terminated              cr_run
-./t-20001030-01 > context 2>&1
-Checkpoint failed: no processes checkpointed
-ll
-total 344
--r-------- 1 hmeij its 180798 Oct 31 10:22 checkpoint.2084
--rw-r--r-- 1 hmeij its  12560 Oct 31 10:23 context
--rw-r--r-- 1 hmeij its   5643 Oct 31 10:18 info.txt
--rw-r--r-- 1 hmeij its   2867 Oct 30 14:27 lsf_readme.txt
--rwxr--r-- 1 hmeij its    657 Oct 31 10:08 run.serial
--rwxr-xr-x 1 hmeij its   7298 Oct 17 14:16 t-20001030-01
-[1]+  Done                    ./run.serial
-[hmeij@n33 blcr]$ tail -1 context
-*************************************************************************************************************************************************************
-[hmeij@n33 blcr]$ tail -1 context | wc -c
-[hmeij@sharptail ~]$ ll /sanscratch/62322
-total 16
--rwx------ 1 hmeij its 1796 Oct 31 11:06 1383231850.62322
--rw------- 1 hmeij its    0 Oct 31 11:06 1383231850.62322.err
--rw------- 1 hmeij its    0 Oct 31 11:06 1383231850.62322.out
--rwxr--r-- 1 hmeij its 1457 Oct 31 11:07 1383231850.62322.shell
--rw-r--r-- 1 hmeij its    0 Oct 31 11:07 context
--rwxr-xr-x 1 hmeij its 7298 Oct 17 14:16 t-20001030-01
-[hmeij@sharptail ~]$ ll ~/.ls
-ls: cannot access /home/hmeij/.ls: No such file or directory
-[hmeij@sharptail ~]$ ll ~/.lsbatch/
-total 0
-lrwxrwxrwx 1 hmeij its 34 Oct 31 11:06 1383231850.62322 ->
-/sanscratch/62322/1383231850.62322
-lrwxrwxrwx 1 hmeij its 38 Oct 31 11:06 1383231850.62322.err ->
-/sanscratch/62322/1383231850.62322.err
-lrwxrwxrwx 1 hmeij its 38 Oct 31 11:06 1383231850.62322.out ->
-/sanscratch/62322/1383231850.62322.out
-lrwxrwxrwx 1 hmeij its 40 Oct 31 11:06 1383231850.62322.shell ->
-/sanscratch/62322/1383231850.62322.shell
+Now we can write a batch script for the scheduler.  We need to do several things
+  * The job will always end up in /sanscratch/JOBPID so we need to stage and save our data
+  * The checkpoint file should be written to a safe place, like /home
+  * The time interval for checkpointing should be sufficiently large to not slow the job down
+    * for example set it to 12 hours or 24 hours even
+    * the small interval times in script is just for testing
+  * Then there are 2 blocks of line sto (un)comment
+    * One to invoke ''cr_run''
+    * One to invoke ''cr_restart''
+  * For a restart we need tow things
+    * Create a link from old working directory to new working directory (saved in the pwd text file)
+    * And edit the script and change the comment blocks and edit the process_id
+      * The restart job may end up on another node but will same process_id
+After you have restarted, you can observe the tool starting from the checkpoint file you are pointing to.  To simulate a crash, while your first submission is running with ''cr_run'' you can simply find the node it is running on and the process ID (in the file *out) then issue the command ''ssh node_name kill process_id'' and wait for the next while iteration to terminate the program.  The scheduler will think the job terminate fine (job status DONE). Or just issue a ''bkill'' command, you should be able to recover from it too.
+It would be ever sweeter if the scheduler could be told to do all the checkpointing at intervals.  I'm investigating that but in the meantime you can do it manually.
+** run.serial**
+<code>
+#!/bin/bash
+# submit via 'bsub < run.serial'
+rm -f *err *out *shell
+#BSUB -q test
+#BSUB -n 1
+#BSUB -J test
+#BSUB -o out
+#BSUB -e err
+export PATH=/share/apps/blcr/0.8.5/test/bin:$PATH
+export LD_LIBRARY_PATH=/share/apps/blcr/0.8.5/test/lib:$LD_LIBRARY_PATH
+# checkpoint file is defined in while loop
+MYSANSCRATCH=/sanscratch/$LSB_JOBID
+MYLOCALSCRATCH=/localscratch/$LSB_JOBID
+export MYSANSCRATCH MYLOCALSCRATCH
+cd $MYSANSCRATCH
+# stage the application (plus data if needed)
+cp -rp ~/blcr/t-20001030-01 .
+# on first start of application, remember the working directory
+# save some stuff for checking later and restart
+#cr_run ./t-20001030-01 > context 2>&1 &
+#sleep 60
+#process_id=`ps -u hmeij | grep t-20001030-01 | grep -v grep | awk '{print $1}'`
+#pwd > pwd.$process_id
+#cp -p pwd* *.shell *.out *.err ~/blcr/
+# on restart, give cr_restart some time to set up
+# WARNING: it will overwrite the checkpoint file, save it
+# you need to find the process_id and supply it
+process_id=4711
+cp -p ~/blcr/checkpoint.$process_id ~/blcr/checkpoint.$process_id.saved
+mv ~/blcr/context  ~/blcr/context.save
+ln -s $MYSANSCRATCH `cat ~/blcr/pwd.$process_id`
+cr_restart ~/blcr/checkpoint.$process_id > context 2>&1 &
+sleep 60
+# always uncommented
+echo "process_id=$process_id"
+while [ $process_id -gt 0 ]; do
+        # checkpoint time interval, make it very large (small for testing)
+        sleep 120
+        # save the checkpoint file outside of sanscratch
+        cr_checkpoint -f ~/blcr/checkpoint.$process_id $process_id
+        cp -p context ~/blcr/
+        # if the application has crashed, or finished, exit
+        process_id=`ps -u hmeij | grep t-20001030-01 | grep -v grep | awk '{print $1}'`
+        if [ "${process_id}x" = 'x' ]; then
+                rm -f `cat ~/blcr/pwd.$process_id`
+                exit;
+        fi
+done
+</code>
 \\
 **[[cluster:0|Back]]**

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