[BUG] The memory usage of curve-fuse is so high

[Wine93]

Background

We use vdbench to test curvefs by specified configure file and found that the memory usage of the curve-fuse client is so high.

run vdbench

sudo ./vdbench -jn -f profile

configure

data_errors=1
fsd=fsd1,anchor=/mnt/curvefs/test1/d1,depth=1,width=10,files=50,sizes=(100m,0),shared=yes,openflags=o_direct
fsd=fsd2,anchor=/mnt/curvefs/test2/d2,depth=1,width=10,files=20,sizes=(100m,0),shared=yes,openflags=o_direct
fsd=fsd3,anchor=/mnt/curvefs/test3/d3,depth=1,width=10,files=50,sizes=(300m,0),shared=yes,openflags=o_direct
fwd=fwd1,fsd=fsd*,threads=10,xfersize=(512,20,4k,20,64k,20,512k,20,1024k,20),fileio=random,fileselect=random,rdpct=70
rd=rd1,fwd=fwd*,fwdrate=max,format=restart,elapsed=2000000,interval=1

memory usage