5.1.1.4. Fingerprinting Speed

About

Modern CPUs utilize hardware acceleration to create SHA-512 fingerprints and can hash up to roughly a Gigabyte of raw data per second. To prevent fingerprinting from consuming too much bandwidth between the Strawberry server and the shared storage, the process is throttled by Strawberry.

Strawberry can run up to three simultaneous fingerprinting jobs from which each is, by default, limited to 50 MB/sec. This means three simultaneous Fingerprinting jobs result in a maximum hashing throughput of 150MB per second, or 540 Gigabytes per hour. This limit is arbitrary and can be changed from the Strawberry console as follows:

Changing the Fingerprinting Speed

Usage

1. SSH login to the Strawberry server as root.
2. Type sb console and press enter. This will launch the Rails command line.
3. Type Settings.file_hashing_max_speed and press enter. This will show you the current hashing speed per job in bytes.
4. Now type Settings.file_hashing_max_speed = x.megabyte, whereby x represents your new value. If you set the value to 0, then throttling will be disabled entirely, and Fingerprinting will run at the maximum possible speed.
5. Press enter to apply your changes.
6. To check whether your new value has been applied, type Settings.file_hashing_max_speed and press enter.
7. Type exit and then press enter to leave the console.

*Changing the hashing speed will take effect immediately, meaning a restart of Strawberry services is not required. Fingerprinting jobs that are currently running will use the previous speed value, while enqueued jobs will use the new value as soon as they are being processed.

Example 1 – Running fingerprinting with 100 MB/Sec per process.

Settings.file_hashing_max_speed = 100.megabyte

Example 2 – Running fingerprinting without process speed limit.

Settings.file_hashing_max_speed = 0