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| Main Page |
| 9.1 What is the Java universe? |
| 9.2 Submitting a Java job |
| 9.3 VMs on your Condor pool |
5.0 Submitting a Java universe job
5.1 What is the Java universe?
Strictly speaking, the Java universe is not necessary because you can use the vanilla universe for Java jobs. However, we discovered that life can get complicated sometimes. For instance, how can Condor tell if a job exited normally but with an error code, or if the Java virtual machine exited abnormally due to a problem with the computer? Condor should act differently in these two cases: if the JVM is bad, another computer can be tried, but if the job failed, that's the fault of the author.
The Java universe addresses this problem, among others. There is a really wonderful paper about grid computing and the Java universe, and I can't recommend the paper highly enough. You should read this paper.
5.2 Creating a Java program
First you need a Java program. Here's one to start you off. Save it in a file named simple.java.
public class simple
{
public static void main(String[] args)
{
if (args.length != 2) {
System.out.println("Usage: simple.java <sleep-time> <integer>");
}
Integer arg_sleep_time;
Integer arg_input;
arg_sleep_time = new Integer(args[0]);
arg_input = new Integer(args[1]);
int sleep_time;
int input;
sleep_time = arg_sleep_time.intValue();
input = arg_input.intValue();
try {
System.out.println("Thinking really hard for " + sleep_time + " seconds...");
Thread.sleep(sleep_time * 1000);
System.out.println("We calculated: " + input * 2);
} catch (InterruptedException exception) {
;
}
return;
}
}
Then compile and try out the program:
C:\condor-test> javac simple.java
C:\condor-test> dir simple.class
Volume in drive C has no label.
Volume Serial Number is 14E3-4F7E
Directory of C:\condor-test
11/15/2007 03:38 PM 1,082 simple.class
1 File(s) 1,082 bytes
0 Dir(s) 30,566,567,936 bytes free
C:\condor-test> java simple 4 10
Thinking really hard for 4 seconds...
We calculated: 20
5.3 Submitting a Java job
Create a submit file. Name this file simple.java.sub.
Universe = java Executable = simple.class Arguments = simple 4 10 Log = simple.log.txt Output = simple.out.txt Error = simple.err.txt should_transfer_files = YES when_to_transfer_output = ON_EXIT Queue
Now submit your job:
C:\condor-test> del simple.log
C:\condor-test> condor_submit simple.java.sub
Submitting job(s).
Logging submit event(s).
1 job(s) submitted to cluster 26.
C:\condor-test> condor_q
-- Submitter: lab-21 : <129.215.30.181:2207> : lab-21
ID OWNER SUBMITTED RUN_TIME ST PRI SIZE CMD
8.0 Administrator 11/27 10:54 0+00:00:00 I 0 0.0 java simple 4 10
1 jobs; 1 idle, 0 running, 0 held
C:\condor-test> condor_q
-- Submitter: lab-21 : <129.215.30.181:2207> : lab-21
ID OWNER SUBMITTED RUN_TIME ST PRI SIZE CMD
8.0 Administrator 11/27 10:54 0+00:00:02 R 0 0.0 java simple 4 10
1 jobs; 0 idle, 1 running, 0 held
C:\condor-test> condor_q
-- Submitter: lab-21 : <129.215.30.181:2207> : lab-21
ID OWNER SUBMITTED RUN_TIME ST PRI SIZE CMD
0 jobs; 0 idle, 0 running, 0 held
C:\condor-test> more simple.log.txt
000 (008.000.000) 11/27 10:54:01 Job submitted from host: <129.215.30.181:2207>
...
001 (008.000.000) 11/27 10:54:07 Job executing on host: <129.215.30.173:2217>
...
005 (008.000.000) 11/27 10:54:12 Job terminated.
(1) Normal termination (return value 0)
Usr 0 00:00:00, Sys 0 00:00:00 - Run Remote Usage
Usr 0 00:00:00, Sys 0 00:00:00 - Run Local Usage
Usr 0 00:00:00, Sys 0 00:00:00 - Total Remote Usage
Usr 0 00:00:00, Sys 0 00:00:00 - Total Local Usage
58 - Run Bytes Sent By Job
1082 - Run Bytes Received By Job
58 - Total Bytes Sent By Job
1082 - Total Bytes Received By Job
Congratulations, you've submitted a Java job to Condor!
5.4 Java on your Condor pool
Condor keeps track of which computers have a functional Java virtual machine and which version it is. You can find this out by using condor_status:
C:\condor-test> condor_status -java
Name JavaVendor Ver State Activity LoadAv Mem ActvtyTime
lab-01 Sun Micros 1.6.0_ Unclaimed Idle 0.000 502 0+03:15:04
lab-02 Sun Micros 1.6.0_ Unclaimed Idle 0.000 502 0+03:15:04
lab-03 Sun Micros 1.6.0_ Unclaimed Idle 0.050 502 0+02:45:04
lab-04 Sun Micros 1.6.0_ Unclaimed Idle 0.000 502 0+00:19:05
lab-05 Sun Micros 1.6.0_ Unclaimed Idle 0.090 502 0+03:05:04
lab-06 Sun Micros 1.6.0_ Unclaimed Idle 0.040 502 0+00:15:04
lab-07 Sun Micros 1.6.0_ Unclaimed Idle 0.000 502 0+00:10:04
lab-08 Sun Micros 1.6.0_ Unclaimed Idle 0.040 502 0+03:05:04
lab-09 Sun Micros 1.6.0_ Unclaimed Idle 0.100 502 0+03:05:04
lab-10 Sun Micros 1.6.0_ Unclaimed Idle 0.000 502 0+03:05:04
lab-11 Sun Micros 1.6.0_ Unclaimed Idle 0.020 502 0+03:00:04
lab-13 Sun Micros 1.6.0_ Unclaimed Idle 0.020 502 0+00:01:32
lab-14 Sun Micros 1.6.0_ Unclaimed Idle 0.050 502 0+03:00:04
lab-15 Sun Micros 1.6.0_ Unclaimed Idle 0.000 502 0+02:55:04
lab-16 Sun Micros 1.6.0_ Unclaimed Idle 0.070 502 0+03:40:04
lab-17 Sun Micros 1.6.0_ Unclaimed Idle 0.000 502 0+02:55:04
lab-19 Sun Micros 1.6.0_ Unclaimed Idle 0.000 502 0+02:55:04
lab-20 Sun Micros 1.6.0_ Unclaimed Idle 0.000 502 0+02:50:04
lab-21 Sun Micros 1.6.0_ Unclaimed Idle 0.000 502 0+02:50:04
lab-22 Sun Micros 1.6.0_ Unclaimed Idle 0.090 502 0+00:15:19
Total Owner Claimed Unclaimed Matched Preempting Backfill
INTEL/WINNT51 20 0 0 20 0 0 0
Total 20 0 0 20 0 0 0
C:\condor-test> condor_status -l lab-01 | find "Java"
JavaVendor = "Sun Microsystems Inc."
JavaVersion = "1.6.0_03"
JavaMFlops = 422.381805
HasJava = TRUE
StarterAbilityList = "HasFileTransfer,HasPerFileEncryption,HasReconnect,
HasMPI,HasTDP,HasJobDeferral,HasJICLocalConfig,HasJICLocalStdin,HasJava,HasVM,
HasWindowsRunAsOwner"
Make another scientific program that takes its input from a file. Now submit 3 copies of this program where each input file is in a separate directory. Use the initialdir option described in the lecture, or in the manual.
We don't yet hav java checkpointing for Java. In the past we implemented it and found it to be unusably slow. Your tutorial leader can fill you in on the details. However, Java has something similar to the remote I/O provided by the standard universe. You can read about the Java universe and Chirp I/O to learn more.
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