[Unison-hackers] Does unison collect the memory automatically?

[jiaoyingtian]

Hello, there is a problem i have.
There are two machine in my environment,and they sync the file by unison.
When the environment run at the beinging time the memory which the unison 
client use is 8m,but after it run two days ,the memory has  been up to  68m.
So  i want to know whether the unison has the memory collection method? Why 
the memory has increased so much?