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Re: [tor-bugs] #22255 [Core Tor/Tor]: Frequent OOM kills of tor process

#22255: Frequent OOM kills of tor process
--------------------------+------------------------------------
 Reporter:  DeS           |          Owner:
     Type:  defect        |         Status:  new
 Priority:  High          |      Milestone:  Tor: 0.3.0.x-final
Component:  Core Tor/Tor  |        Version:
 Severity:  Major         |     Resolution:
 Keywords:                |  Actual Points:
Parent ID:                |         Points:
 Reviewer:                |        Sponsor:
--------------------------+------------------------------------

Comment (by DeS):

 Thx for the feedback
 smem log pushed to every 60 seconds.
 Options added as described.
 Waiting for next incedent to document.


 Replying to [comment:53 cypherpunks]:
 > some observations:
 >
 > minimal logged free memory was 84MB at 2017-06-02 18:59:11
 >
 https://trac.torproject.org/projects/tor/attachment/ticket/22255/mem.2.log#L2256
 > {{{
 > 2017-06-02 18:59:11           3786       3702         84          0
 0          4
 > }}}
 >
 > but
 https://trac.torproject.org/projects/tor/attachment/ticket/22255/PROC_MEMINFO.log
 > tells another story? (lower polling rate), lowest value at:
 > {{{
 > Fre Jun  2 18:45:49 CEST 2017
 > MemTotal:        3877580 kB
 > MemFree:          139124 kB
 > }}}
 > already better after that:
 > {{{
 > Fre Jun  2 18:56:41 CEST 2017
 > MemTotal:        3877580 kB
 > MemFree:         3052860 kB
 > }}}
 >
 >
 > > 4000MB - (300MB +400 MB) = 3300MB
 >
 > you have 3786 MB memory (not 4000 MB)
 >
 >
 > I find percentage (or at least '-k') output with relevant process at the
 top much more readable/useful:
 > {{{
 > smem -pr
 > }}}
 > (you might also reduce the output to relevant columns only)
 > {{{
 > -c 'command rss swap'
 > }}}
 >
 > > How can a rising number of connections (to tor - nothing else running)
 drain the 4G memory out of the machine when the tor processes itself only
 use about 1G.
 >
 > My feeling is that tor uses about 500MB per process when it gets killed
 but uses much more before that.
 > Running 'smem' every 60 seconds might provide some valuable data.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22255#comment:54>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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