[tor-relays] Out of memory message

[Logforme <m7527@xxxxxx>]

I run the relay Logforme (855BC2DABE24C861CD887DB9B2E950424B49FC3).
Yesterday I saw new messages in the log file:
Dec 06 09:28:13.000 [notice] We're low on memory.  Killing circuits with
over-long queues. (This behavior is controlled by MaxMemInQueues.)
Dec 06 09:28:16.000 [notice] Removed 1040388096 bytes by killing 1
circuits; 14631 circuits remain alive.

Do I read that correctly as one circuit using 1GB of memory?

Here's the first lines from the top command:
top - 09:40:41 up 31 days,  1:51,  1 user,  load average: 0.53, 0.62, 0.66
Tasks:  95 total,   3 running,  92 sleeping,   0 stopped,   0 zombie
%Cpu(s): 10.2 us,  2.0 sy,  0.0 ni, 83.2 id,  0.0 wa,  0.0 hi,  4.5 si, 
0.0 st
KiB Mem:   3950828 total,  3833092 used,   117736 free,    49696 buffers
KiB Swap:  3212284 total,  1296392 used,  1915892 free,    99168 cached

  PID USER      PR  NI  VIRT  RES  SHR S  %CPU %MEM    TIME+  COMMAND
 2680 debian-t  20   0 4134m 2.8g  24m R  63.5 73.4  27199:00 tor

The relay is running on a dedicated debian box with 4GB of ram. It
usually only uses about 0.5GB but now it is maxed out. The relay and the
box is so far working fine, I just wonder if this is some kind of attack
or if anything is wrong and if there is anything I should do about it.
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