The getSamples method in ArcGIS Server Image Service can be used for measuring performance.

Step-by-step guide

  1. Enter geometry.

  2. Use Point for Geometric Type.
  3. Enter 1000 for Sample Count.
  4. (Optional) Enter Mosaic Rule.

  5. (Optional) Enter pixel size.

  6. Set Return First Value Only: to false.

If REST service asks login credentials and fails to retrieve samples, it means that permission is not set properly (during 10.7 to 10.8 migration).

Make service public using ArcGIS Server Manager web interface.

Use web browser instead of wget to get sample points after logging in with siteadmin.