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From "Rohit Sharma (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (COUCHDB-2058) CouchDB Memory Leak - Beam.smp
Date Wed, 12 Feb 2014 18:59:25 GMT

    [ https://issues.apache.org/jira/browse/COUCHDB-2058?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13899433#comment-13899433
] 

Rohit Sharma commented on COUCHDB-2058:
---------------------------------------

Hey Paul, sorry about the confusion. I just finished another test and looks like vast amount
of memory is released when I restart the CouchDB: Here are the stats:

Before running process: (After rebooting the server)
 Mem:   8061508k total,  1694180k used,  6367328k free,    35224k buffers
Swap:  2064376k total,        0k used,  2064376k free,   290184k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND                     
                                                                                         
                                                                                         
                  
11671 root      20   0  591m  77m 4372 S  1.3  1.0   0:07.63 /usr/local/lib/erlang/erts-5.10.4/bin/beam.smp
-Bd -K true -A 4 -- -root /usr/local/lib/erlang -progname erl -- -home /root -- -nosh
                                                                                         
                         


After Finishing the process - 7.2G (1.8G is page cache) memory consumed out of 8G
Mem:   8061508k total,  7212840k used,   848668k free,    38788k buffers
Swap:  2064376k total,        0k used,  2064376k free,  1836020k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND                     
                                                                                         
            
11671 root      20   0 4653m 3.8g 4392 S  2.0 48.8  41:41.53 /usr/local/lib/erlang/erts-5.10.4/bin/beam.smp
-Bd -K true -A 4 -- -root /usr/local/lib/erlang -progname erl -- -home /root -- -nosh
 
 
After restarting CoucchDB (4G of memory released by CouchDB)
Mem:   8061508k total,  3297380k used,  4764128k free,    38940k buffers
Swap:  2064376k total,        0k used,  2064376k free,  1837240k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND                     
                                                                                         
            
12305 root      20   0  532m  24m 4212 S  0.3  0.3   0:00.98 /usr/local/lib/erlang/erts-5.10.4/bin/beam.smp
-Bd -K true -A 4 -- -root /usr/local/lib/erlang -progname erl -- -home /root -- -nosh


Could you please share your thoughts on these stats. Appreciated!

> CouchDB Memory Leak - Beam.smp
> ------------------------------
>
>                 Key: COUCHDB-2058
>                 URL: https://issues.apache.org/jira/browse/COUCHDB-2058
>             Project: CouchDB
>          Issue Type: Bug
>      Security Level: public(Regular issues) 
>          Components: Database Core
>            Reporter: Rohit Sharma
>
> Hello,
> I am experiencing performance issue with CouchDB.
> Use Case: I am working on a process that retrieves the data from RDBMS and process them
into JSON document and POST them to the CouchDB.
> I am trying to POST around half a million documents, most of them in batches (_bulk_doc)
of 10,000 and have tried with batch of 5,000, 15,000, and 20,000.
> Whole process takes around 90-100 minutes.
> During the life of the process, Memory Consumption by CouchDB keeps on growing and memory
is not released when CouchDB has finished working.
> So if the memory consumption by CouchDB was 60% at the time process finishes, memory
consumption will remain 60% and not reducing. 
> Subsequently, when the process starts running again. memory consumption is Maxed out
and CouchDB restarts itself. This restart fails the process that I am running. Looking at
the Syslogs , I see Out Of Memory Error by the CouchDB process and killing statement.
> The CouchDb process that has the issue is the "beam.smp" of Erlang.
> At this point, I have tried upgrading the memory of the server to see if this resolves
the issue, unfortunately, the issue persists. Memory Leak is there and Usage keeps on growing
until CouchDB restarts/crashed.
> I also have tried running garbage collection from Erlang command (erlang:garbage_collect().)
line but it didn't do anything.
> At this point, I am out of ideas and not sure what is going on here. Any input/suggestion
is highly appreciated!
> Env:
> Platform: Linux (Red Hat release 6.4 (Santiago))
> CouchDB: 1.3 and have tried with 1.5 as well
> RAM: Tried with 2G, 4G, and 8G
> CPU: 2 cores
> Process:/usr/lib64/erlang/erts-5.8.5/bin/beam.smp -Bd -K true -A 4 -- -root /usr/lib64/erlang



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