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https://issues.apache.org/jira/browse/AMBARI-25823?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17649692#comment-17649692
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Ravuri Sushma sree commented on AMBARI-25823:
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[~brahma] , Can you please add me as a contributor for Ambari so I can
contribute some fixes. Thank you!
> Fix the widget.json for the Host memory used %
> -----------------------------------------------
>
> Key: AMBARI-25823
> URL: https://issues.apache.org/jira/browse/AMBARI-25823
> Project: Ambari
> Issue Type: Bug
> Reporter: Ravuri Sushma sree
> Priority: Major
>
> Heatmap is displayed wrongly. The main reason for that is currently the
> formula used is
> "value": "${((mem_total - mem_cached - mem_free)/mem_total)*100}"
>
> But as per host_info.py
> 'mem_free': bytes2kilobytes(mem_stats.available) if hasattr(mem_stats,
> 'available') else 0, # the actual amount of available memory
> We mark the 'available' memory from psutil.virtual_memory() command as the
> free memory. Basically this is wrong. 'free' memory is the memory available
> after the cached memory getting reduced from total memory but the 'available'
> memory is the total available memory including the cached memory as that can
> be reclaimed anytime.
>
> So mem_free is nothing but mem_available. So in the host memory used heat map
> we should just do
> (mem_total-mem_free)/mem_total to get the used memory fraction.
>
> This is what psutil.virtual_memory() internally does to get the used
> percentage.
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