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-Dduracloud.bridge.threads-per-job=5"

This setting defines the number of threads that can be allocated for transferring files for each snapshot that is in progress.

What setting values should I use?

Together, the size of the jobTaskExecutor pool and the threads-per-job setting define your CPU utilization. Exactly how this translates to normalized load average can only be determined by experimentation.

The production DuraCloud Vault bridge application during a period of high activity in Jan-Mar 2018 landed on these settings, which provided the preferred load average:

CPU Cores24
jobTaskExecutor size (maxPoolSize and corePoolSize)7
threads-per-job5

The total potential threads with these settings is (7 * 5) = 35. 

This was with a setting of 24 CPU cores on the bridge VM. This suggests that a ratio of potential threads to CPU cores of (35 / 24) = 1.45 is about right.


Attempting to achieve the same ratio for a machine with 8 CPU cores, might suggest settings like:

CPU Cores8
jobTaskExecutor size (maxPoolSize and corePoolSize)4
threads-per-job3

Total potential threads (4 * 3) = 12. Ratio of potential threads to CPU cores = 1.5.