Queue wait time

[jjnicola]

What: Wait a minute between scans starts.

Why: Currently the queue system in ospd prevents to start a new scan if there is not enough available memory. This produces that new scans are put in the queue, while the memory condition is not satisfied. Once some memory is released, all scans in queue are started. In the issue mentioned above, I pasted what I found in the log.

How:

• Set min_free_mem_scan_queue option to some value, to avoid starting scans.
• Start many task
• release memory to allow queued scans to start.
• Check in the log that the time between takes about a minute, and the queued scans are not started all together.

Checklist:

• [ ] Tests
• [x] CHANGELOG Entry

[codecov[bot]]

Codecov Report

Merging #401 (8687776) into ospd-20.08 (11395cd) will increase coverage by 0.13%. The diff coverage is 100.00%.

@@              Coverage Diff               @@
##           ospd-20.08     #401      +/-   ##
==============================================
+ Coverage       74.41%   74.55%   +0.13%     
==============================================
  Files              23       23              
  Lines            2627     2641      +14     
==============================================
+ Hits             1955     1969      +14     
  Misses            672      672              

Impacted Files	Coverage Δ
ospd/ospd.py	72.31% <100.00%> (+0.57%)	:arrow_up:

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