Frequently Asked Questions

What are the software requirements for Open XDMoD?

See Software Requirements for details.

What are the hardware requirements for Open XDMoD?

The hardware requirements for Open XDMoD depend on how many concurrent users you have and how much data you have. You’ll need roughly 300MB of disk space per 1 Million jobs on your MySQL server.

Will Open XDMoD run on RHEL 5?

It is possible, but you must have PHP 5.3 installed.

Can I use Open XDMoD with MySQL 5.0?

Open XDMoD should work with MySQL 5.0, but it hasn’t been tested extensively, so we recommend MySQL 5.1 or 5.5.

How do I enable LDAP Authentication?

Open XDMoD has support for federated authentication using simpleSAMLphp. Basic support for LDAP Authentication is also provided.

Why does the ingestion process take a long time?

If you are experiencing long ingestion times make sure that you have tuned MySQL properly. See Optimizing the MySQL Server for more details.

Here is an example of some server parameters that you can change. Be sure to understand any changes you make to your MySQL server configuration.

key_buffer_size         = 1G
sort_buffer_size        = 8M
read_buffer_size        = 4M
join_buffer_size        = 16M
innodb_buffer_pool_size = 64M
max_allowed_packet      = 16M
tmp_table_size          = 1G
max_heap_table_size     = 128M
thread_stack            = 256K
thread_cache_size       = 8
query_cache_limit       = 16M
query_cache_size        = 1G

How do I install Open XDMoD in a non-root URL?

Non-root URLs are not supported at this time.

How do I change the charts on the summary page?

See HOWTO Change Summary Page Charts for details.

How do I add more user names after the initial import?

Just repeat the process found here with the new user names.

How do I delete all my job data from Open XDMoD?

If you think the job data in your Open XDMoD database is corrupted, you may want to delete your job data and start over. To do so, use this command:

 $ xdmod-admin --truncate --jobs

Running this command will truncate all the tables containing job data and you can then re-shred and re-ingest your resource manager data.

Why do I see the error message “It is not safe to rely on the system’s timezone settings…”?

You need to set your timezone in your php.ini file. Add the following, but substitute your timezone:

date.timezone = America/New_York

The PHP website contains the full list of supported timezones.

Why do I see “Unknown resource attribute” in my xdmod-shredder output?

This indicates that you are using a resource attribute that Open XDMoD does not recognize. This isn’t a problem and can be safely ignored.

Why do I see the error message “ERROR 1419 (HY000) at line 290: You do not have the SUPER privilege and binary logging is enabled…”?

You have binary logging enabled, but the user you specified to create the Open XDMoD databases doesn’t have the SUPER privilege. You should either disable binary logging (assuming you don’t need it) or grant the SUPER privilege to the user that will create the databases. You may also use the less safe log_bin_trust_function_creators variable.

Why do I see the error message “Failed to correct job times” during the shredding process?

Resource manager account log records may be missing some job data under certain circumstances. It is expected that a job record will have a start time, end time and wall time. If one of these is missing it will be calculated using the other two. If two or more are missing the error message in question will be displayed along with the values that were present in the job record. In addition to this error message a file will be produced at the end of the shredding process containing the job record that produced the error along with additional details. Look for the log message “Job errors written to …”.

One example of a situation that will produce this error is that some resource managers record a 0 start time in their accounting logs when a job is canceled before the job started. It is also possible that other errors occurred to produce these values so they are not ignored and this error message is produced. As of Open XDMoD 7.0 any job with a start or end time equal to 0 will not be ingested into the data warehouse and will not contribute to the job count or any other metrics. Previous versions of Open XDMoD did include these jobs which resulted in inaccurate results.