[MESOS-9249] Avoid dirtying the DRF sorter when allocating resources.

• Type: Improvement
• Status: Resolved
• Priority: Critical
• Resolution: Fixed
• Fix Version/s: 1.7.1, 1.8.0
• Component/s: allocation
• Labels: performance
• Target Version/s: 1.7.1
• Epic Link: Allocator performance improvement.
• Sprint: Mesosphere Sprint 2018-29
• Assignee: Benjamin Mahler
• Reporter: Benjamin Mahler
• Created: 21/Sep/18 22:38
• Updated: 28/Jan/19 23:19
• Resolved: 27/Sep/18 01:15

Description

The perf data that mzhu provided revealed that when there are many frameworks, the DRFSorter::sort() function ends up dominating the time spent during an allocation cycle.

To improve performance, it's possible to avoid dirtying the sorter so that it remains sorted throughout the entire allocation cycle.

Issue Links

• relates to: MESOS-9255 Use consistent "totals" across role / framework DRF.