Odd OS-level memory reporting for Java

[Todd Lipcon]

Note that linux counts mapped files as RSS if they're paged in. Maybe try
something like summing up the various different memory types from
/proc/<pid>/smaps ? eg:

$ cat /proc/$(pgrep java)/smaps  | perl -mData::Dumper -n -e 'if
(/(.+):\s+(\d+) kB/) { $sum{$1} += $2; } END { print
Data::Dumper::Dumper(\%sum); }'
$VAR1 = {
          'Rss' => 475148,
          'Shared_Dirty' => 20,
          'Locked' => 0,
          'MMUPageSize' => 2128,
          'Shared_Clean' => 9660,
          'Size' => 2860292,
          'Private_Dirty' => 459248,
          'KernelPageSize' => 2128,
          'Swap' => 0,
          'Referenced' => 472196,
          'Anonymous' => 459240,
          'Pss' => 465681,
          'AnonHugePages' => 444416,
          'Private_Clean' => 6220
        };



On Thu, Jan 7, 2016 at 9:18 AM, Yu Zhang <yu.zhang at oracle.com> wrote:

> With 8u66, can you switch to g1gc and see if it has the same issue? Trying
> to understand if it is G1GC vs CMS, or different jdk version
>
> Thanks,
> Jenny
>
> On 1/7/2016 9:08 AM, Shawn Heisey wrote:
>
> It is probably worth mentioning that I have another Linux machine
> running Java 8u66 and Solr 5.3 with CMS GC (the same settings that I
> just listed for my Win7 desktop machine) is **not** showing the same SHR
> and RES inflation:
>
>
>
> _______________________________________________
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> hotspot-gc-use at openjdk.java.net
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>
>


-- 
Todd Lipcon
Software Engineer, Cloudera
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