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Merge pull request #91 from IAlwaysBeCoding/patch-2
Added command line documentation from config.py
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‎docs/command-line.md‎

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## Configuration flags
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All the command-line tools support a set of common configuration flags, defined in [config.py](https://github.com/pricingassistant/mrq/blob/master/mrq/config.py). Use --help with any of them to see the full list.
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- **General arguments**:these can be passed to either **mrq-worker**,**mrq-run**, or **mrq-dashboard**
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- `--trace_greenlets`:Collect stats about each greenlet execution time and switches.Defaults to **false**.
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- `--trace_memory`:Collect stats about memory for each task. Incompatible with --greenlets > 1. Defaults to **false**.
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- `--trace_io`:Collect stats about all I/O operations.Defaults to **true**.
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- `--print_mongodb`:Print all MongoDB requests.Defaults to **false**.
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- `--trace_memory_type`:Create a .png object graph in trace_memory_output_dir with a random object of this type.
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- `--trace_memory_output_dir`:Directory where to output .pngs with object graphs.Defaults to folder **memory_traces**.
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- `--profile`:Run profiling on the whole worker.Defaults to **false**.
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- `--mongodb_jobs, --mongodb`: MongoDB URI for the jobs, scheduled_jobs & workers database.Defaults to **mongodb://127.0.0.1:27017/mrq**.
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- `--mongodb_logs`:MongoDB URI for the logs database."0" will disable remote logs, "1" will use main MongoDB.Defaults to **1**
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- `--mongodb_logs_size`:If provided, sets the log collection to capped to that amount of bytes.
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- `--no_mongodb_ensure_indexes`:If provided, skip the creation of MongoDB indexes at worker startup.
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- `--redis`:Redis URI.Defaults to **redis://127.0.0.1:6379**.
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- `--redis_prefix`:Redis key prefix.Default to "mrq".
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- `--redis_max_connections`:Redis max connection pool size.Defaults to **1000**.
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- `--redis_timeout`:Redis connection pool timeout to wait for an available connection.Defaults to **30**.
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- `--name`:Specify a different name.
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- `--quiet`:Don\'t output task logs.Defaults to **false**.
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- `--config, -c`:Path of a config file.
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- `--worker_class`:Path to a custom worker class.Defaults to **"mrq.worker.Worker"**.
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- `--version, -v`:Prints current MRQ version.Defaults to **false**.
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- `--no_import_patch`:Skips patching __import__ to fix gevent bug #108.Defaults to **false**.
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- `--add_network_latency`:Adds random latency to the network calls, zero to N seconds. Can be a range (1-2)').Defaults to **0**.
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- `--default_job_result_ttl`:Seconds the results are kept in MongoDB when status is success.Defaults to **604800** seconds which is 7 days.
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- `--default_job_abort_ttl`:Seconds the tasks are kept in MongoDB when status is abort.Defaults to **86400** seconds which is 1 day.
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- `--default_job_cancel_ttl`:Seconds the tasks are kept in MongoDB when status is cancelDefaults to **86400** seconds which is 1 day.
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- `--default_job_timeout`:In seconds, delay before interrupting the job.Defaults to **3600** seconds which is 1 hour.
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- `--default_job_max_retries`:Set the status to "maxretries" after retrying that many times.Defaults to **3** seconds.
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- `--default_job_retry_delay`:Seconds before a job in retry status is requeued again.Defaults to **3** seconds.
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- `--use_large_job_ids`:Do not use compacted job IDs in Redis. For compatibility with 0.1.x only. Defaults to **false**.
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- `mrq-worker` starts a worker
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- `mrq-dashboard` starts the web dashboard on the default port
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- `mrq-run` runs a task. If you add the `--async` option that will enqueue it to be later ran by a worker
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- `queues`: The queues to listen on.Defaults to **default** , which will listen on all queues.
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- `--max_jobs`:Gevent:max number of jobs to do before quitting. Temp workaround for memory leaks.Defaults to **0**
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- `--max_memory`:Max memory (in Mb) after which the process will be shut down. Use with `--processes [1-N]`
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to have supervisord automatically respawn the worker when this happens.Defaults to **1**
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- `--grenlets, --gevent, --g`:Max number of greenlets to use.Defaults to **1**.
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- `--processes, --p`:Number of processes to launch with supervisord.Defaults to **0**.
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- `--supervisord_template`:Path of supervisord template to use. Defaults to **supervisord_templates/default.conf**.
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- `--scheduler`:Run the scheduler.Defaults to **false**.
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- `--scheduler_interval`:Seconds between scheduler checks.Defaults to **60** seconds, only ints are acceptable.
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- `--report_interval`:Seconds between worker reports to MongoDB.Defaults to **10** seconds, floats are acceptable too.
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- `--report_file`:Filepath of a json dump of the worker status. Disabled if none.
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- `--admin_port`:Start an admin server on this port, if provided. Incompatible with --processes.Defaults to **0**
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- `--admin_ip`:IP for the admin server to listen on. Use "0.0.0.0" to allow access from outside.Defaults to **127.0.0.1**.
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- `--local_ip`:Overwrite the local IP, to be displayed in the dashboard.
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- `--max_latency`:Max seconds while worker may sleep waiting for a new job.Can be < 1 and a float value.
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- `mrq-dashboard` starts the web dashboard on the default port.
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- `--dashboard_httpauth`:HTTP Auth for the Dashboard. Format is user:pass.
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- `--dashboard_queue`:Default queue for dashboard actions.
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- `--dashboard_port`:Use this port for mrq-dashboard.Defaults to port **5555**.
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- `--dashboard_ip`:Bind the dashboard to this IP. Default is **0.0.0.0**, use **127.0.0.1** to restrict access.
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- `mrq-run` runs a task. If you add the `--queue` option that will enqueue it to be later ran by a worker.
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- `--queue`:Queue the task on this queue instead of running it right away.
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- `taskpath`:Task to run.
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- `taskargs`:JSON-encoded arguments, or "key value" pairs.
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Typical usage is:
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```
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$ mrq-run tasks.mylib.myfile.MyTask '{"param1": 1, "param2": True}'
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```
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## mrq-worker
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### Concurrency
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The default is to run tasks one at a time. You should obviously change this behaviour to use Gevent's full capabilities with something like:
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## mrq-run
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## mrq-dashboard
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## mrq-dashboard

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