Running multiple Arnold instances on the same computer


Arnold licenses are shared by host. That means all Arnold instances running on the same computer share the same license.

For example, you can have multiple copies of Houdini running on your computer, all doing render regions with HtoA, and you’ll be taking just a single Arnold license. Same thing with Softimage and Maya.

License sharing is defined by your license. The share=h in your license means that all processes (aka instances) running on the same host (aka computer) can share a single license.
license_file_share

Even when licenses are shared, you will still see multiple checkouts in your license usage. For example, here’s my license usage when I have an IPR going in Maya, and render regions in Softimage and Houdini:
share_license_usage
The debug log would show something similar:
share_debug_log
It might look like there are three licenses checked out, but it’s not. It’s just one license, checked out three times (aka shared three times).

If I check my license pool status, I can see that one license is in use:
share_license_pool_status

And if you have reporting enabled, you can check the report and see that all three licenses have the same share handle (which means that the license is being shared):
share_report_log

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