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-layout: default
-navsection: userguide
-title: "Parallel Crunch tasks"
-...
-
-In the previous tutorials, we used @arvados.job_setup.one_task_per_input_file()@ to automatically parallelize our jobs by creating a separate task per file. For some types of jobs, you may need to split the work up differently, for example creating tasks to process different segments of a single large file. In this this tutorial will demonstrate how to create Crunch tasks directly.
-
-Start by entering the @crunch_scripts@ directory of your Git repository:
-
-
-~$ cd $USER/crunch_scripts
-
~/$USER/crunch_scripts$ nano parallel-hash.py
-
-Add the following code to compute the MD5 hash of each file in a collection:
-
-~/$USER/crunch_scripts$ chmod +x parallel-hash.py
-
-Add the file to the Git staging area, commit, and push:
-
-~/$USER/crunch_scripts$ git add parallel-hash.py
-~/$USER/crunch_scripts$ git commit -m"parallel hash"
-~/$USER/crunch_scripts$ git push origin master
-
-~/$USER/crunch_scripts$ cat >~/the_job <<EOF
-{
- "script": "parallel-hash.py",
- "repository": "$USER",
- "script_version": "master",
- "script_parameters":
- {
- "input": "887cd41e9c613463eab2f0d885c6dd96+83"
- }
-}
-EOF
-~/$USER/crunch_scripts$ arv job create --job "$(cat ~/the_job)"
-{
- ...
- "uuid":"qr1hi-xxxxx-xxxxxxxxxxxxxxx"
- ...
-}
-~/$USER/crunch_scripts$ arv job get --uuid qr1hi-xxxxx-xxxxxxxxxxxxxxx
-{
- ...
- "output":"e2ccd204bca37c77c0ba59fc470cd0f7+162",
- ...
-}
-
-~/$USER/crunch_scripts$ arv keep ls e2ccd204bca37c77c0ba59fc470cd0f7+162
-./md5sum.txt
-~/$USER/crunch_scripts$ arv keep get e2ccd204bca37c77c0ba59fc470cd0f7+162/md5sum.txt
-0f1d6bcf55c34bed7f92a805d2d89bbf alice.txt
-504938460ef369cd275e4ef58994cffe bob.txt
-8f3b36aff310e06f3c5b9e95678ff77a carol.txt
-
-