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Date: Tue, 16 Apr 2013 14:55:15 +0000 (UTC)
From: "Jeff Sposetti (JIRA)" <jira@apache.org>
To: ambari-dev@incubator.apache.org
Message-ID: <JIRA.12642721.1366117547089.173675.1366124115973@arcas>
In-Reply-To: <JIRA.12642721.1366117547089@arcas>
References: <JIRA.12642721.1366117547089@arcas>
Subject: [jira] [Updated] (AMBARI-1946) Heatmap memory should not include
 cached memory as part of "used"
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     [ https://issues.apache.org/jira/browse/AMBARI-1946?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jeff Sposetti updated AMBARI-1946:
----------------------------------

    Description: 
The "Memory Used %" is currently calculated using the formula:

(mem_total - mem_free)/mem_total

Although this is accurate, the total includes mem_cached (file system cache), which the kernal can take back whenever it wants to.

Therefore, formula can be doing this instead:

(mem_total - mem_free - mem_cached)/mem_total

  was:
The "Memory Used %" is currently calculated using thie forumla:

(mem_total - mem_free)/mem_total

Although this is accurate, the total includes mem_cached (file system cache), which the kernal can take back whenever it wants to.

Therefore, formula can be doing this instead:

(mem_total - mem_free - mem_cached)/mem_total

    
> Heatmap memory should not include cached memory as part of "used"
> -----------------------------------------------------------------
>
>                 Key: AMBARI-1946
>                 URL: https://issues.apache.org/jira/browse/AMBARI-1946
>             Project: Ambari
>          Issue Type: Bug
>          Components: client
>    Affects Versions: 1.2.2
>            Reporter: Jeff Sposetti
>            Assignee: Yusaku Sako
>         Attachments: AMBARI-1946.patch
>
>
> The "Memory Used %" is currently calculated using the formula:
> (mem_total - mem_free)/mem_total
> Although this is accurate, the total includes mem_cached (file system cache), which the kernal can take back whenever it wants to.
> Therefore, formula can be doing this instead:
> (mem_total - mem_free - mem_cached)/mem_total

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