[tahoe-lafs-trac-stream] [tahoe-lafs] #1910: memory leak on 'tahoe get'

[tahoe-lafs]

#1910: memory leak on 'tahoe get'
----------------------------------+----------------------------
 Reporter:  T_X                   |          Owner:  davidsarah
     Type:  defect                |         Status:  new
 Priority:  normal                |      Milestone:  undecided
Component:  unknown               |        Version:  1.9.2
 Keywords:  memoryleak,immutable  |  Launchpad Bug:
----------------------------------+----------------------------
 When trying to retrieve a file either via sshfs or via 'tahoe get' I seem
 to have a memory leak. Every 'tahoe get' on a 350MB large file seems to
 grow the memory usage of the tahoe daemon by about 20MB:

 {{{
 $ for i in `seq 1 5`; do ps -o %mem,cmd 2303; tahoe get
 "root:path/to/myfile" /dev/null; done; ps -o %mem,cmd 2303
 %MEM CMD
 23.3 /usr/bin/python /usr/bin/tahoe start
 root:path/to/myfile retrieved and written to /dev/null
 %MEM CMD
 26.8 /usr/bin/python /usr/bin/tahoe start
 root:path/to/myfile retrieved and written to /dev/null
 %MEM CMD
 30.9 /usr/bin/python /usr/bin/tahoe start
 root:path/to/myfile retrieved and written to /dev/null
 %MEM CMD
 34.7 /usr/bin/python /usr/bin/tahoe start
 root:path/to/myfile retrieved and written to /dev/null
 %MEM CMD
 38.8 /usr/bin/python /usr/bin/tahoe start
 root:path/to/myfile retrieved and written to /dev/null
 %MEM CMD
 39.1 /usr/bin/python /usr/bin/tahoe start
 $ free -m
              total       used       free     shared    buffers     cached
 Mem:           497        267        229          0          7         37
 -/+ buffers/cache:        222        274
 Swap:          258          0        258
 }}}

 'myfile' is an immutable file according to the web interface. sshfs is
 unmounted for tahoe, so the 'tahoe get's above should be the only tahoe
 commands invoked during that time.

 Versions (as provided by Debian wheezy):
 {{{
 allmydata-tahoe: 1.9.2, foolscap: 0.6.4, pycryptopp: 0.5.29, zfec: 1.4.5,
 Twisted: 12.0.0, Nevow: 0.10.0, zope.interface: unknown, python: 2.7.3rc2,
 platform: Linux-debian_wheezy/sid-x86_64-64bit_ELF, pyOpenSSL: 0.13,
 simplejson: 2.5.2, pycrypto: 2.6, pyasn1: unknown, mock: 0.8.0, sqlite3:
 2.6.0 [sqlite 3.7.13], setuptools: 0.6 [distribute]
 }}}

 Linux 3.2.0-4-amd64 #1 SMP Debian 3.2.32-1 x86_64 unknown unknown
 GNU/Linux

 Encoding parameters: shares.needed = 1, shares.happy = 2.

-- 
Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/1910>
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