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Posted to common-user@hadoop.apache.org by Raghu Angadi <ra...@yahoo-inc.com> on 2008/11/22 00:48:49 UTC

NN JVM process takes a lot more memory than assigned

There is one instance of NN where JVM process takes 40GB memory though 
jvm is started with 24GB. Java heap is still 24GB. Looks like it ends up 
taking a lot of memory outside. There are a lot entries in pmap similar 
to below that account for the difference. Anyone knows what this might be?

 From 'pmap -d'
====
00002ab508000000   64308 rwx-- 00002ab508000000 000:00000   [ anon ]
00002ab50becd000    1228 ----- 00002ab50becd000 000:00000   [ anon ]
00002ab50c000000   64328 rwx-- 00002ab50c000000 000:00000   [ anon ]
00002ab50fed2000    1208 ----- 00002ab50fed2000 000:00000   [ anon ]
00002ab510000000   64720 rwx-- 00002ab510000000 000:00000   [ anon ]
00002ab513f34000     816 ----- 00002ab513f34000 000:00000   [ anon ]
00002ab514000000   64552 rwx-- 00002ab514000000 000:00000   [ anon ]
====

Raghu.