with fence:

ubuntu@riscv64:~/xfer/store-latency$ /usr/bin/time -v ./store-latency
	Command being timed: "./store-latency"
	User time (seconds): 996.28
	System time (seconds): 0.01
	Percent of CPU this job got: 399%
	Elapsed (wall clock) time (h:mm:ss or m:ss): 4:09.11
	Average shared text size (kbytes): 0
	Average unshared data size (kbytes): 0
	Average stack size (kbytes): 0
	Average total size (kbytes): 0
	Maximum resident set size (kbytes): 768
	Average resident set size (kbytes): 0
	Major (requiring I/O) page faults: 0
	Minor (reclaiming a frame) page faults: 82
	Voluntary context switches: 5
	Involuntary context switches: 249873
	Swaps: 0
	File system inputs: 0
	File system outputs: 0
	Socket messages sent: 0
	Socket messages received: 0
	Signals delivered: 0
	Page size (bytes): 4096
	Exit status: 0

without fence:

ubuntu@riscv64:~/xfer/store-latency$ /usr/bin/time -v ./store-latency
	Command being timed: "./store-latency"
	User time (seconds): 1065.15
	System time (seconds): 0.00
	Percent of CPU this job got: 399%
	Elapsed (wall clock) time (h:mm:ss or m:ss): 4:26.32
	Average shared text size (kbytes): 0
	Average unshared data size (kbytes): 0
	Average stack size (kbytes): 0
	Average total size (kbytes): 0
	Maximum resident set size (kbytes): 1024
	Average resident set size (kbytes): 0
	Major (requiring I/O) page faults: 0
	Minor (reclaiming a frame) page faults: 80
	Voluntary context switches: 4
	Involuntary context switches: 266747
	Swaps: 0
	File system inputs: 0
	File system outputs: 0
	Socket messages sent: 0
	Socket messages received: 0
	Signals delivered: 0
	Page size (bytes): 4096
	Exit status: 0