check the ops for rgw:
[root@node06 ceph]# ceph daemon 
/var/run/ceph/ceph-client.rgw.os.dsglczutvqsgowpz.a.13.93908447458760.asok 
objecter_requests| jq ".ops"  | jq 'length'
8
list subdir with s5cmd:
[root@node01 deeproute]# time ./s5cmd --endpoint-url=http://10.x.x.x:80 ls 
s3://mlp-data-warehouse/ads_prediction/
                                  DIR prediction_scenes/
                                  DIR test_pai/

real    0m1.125s
user    0m0.007s
sys     0m0.016s

after the ops increase:
[root@node06 ceph]# ceph daemon 
/var/run/ceph/ceph-client.rgw.os.dsglczutvqsgowpz.a.13.93908447458760.asok 
objecter_requests| jq ".ops"  | jq 'length'
264

list subdir with s5cmd:
[root@node01 deeproute]# time ./s5cmd --endpoint-url=http://10.x.x.x:80 ls 
s3://mlp-data-warehouse/ads_prediction/
                                  DIR prediction_scenes/
                                  DIR test_pai/
real    0m8.822s
user    0m0.004s
sys     0m0.019s


and if the ops increase to more 2000, it needs more than 100s to list the 
subdir, why?
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