Test results: Hyper-V vm, Linux, Fedora 23, xfs. Write size 65536
Opened this issue · 1 comments
jordansissel commented
channel, 64kb, perf trace -s
% sudo perf trace -s java -Djava.io.tmpdir=$HOME/build/tmp -jar target/fsync_compare-0.1-SNAPSHOT.jar channel $((64<<10))
Running channel test
Buffer contains 425 events and has byte size is 65536
Did 16384 writes. Wrote 1073741824 bytes total
syscall calls total min avg max stddev
(msec) (msec) (msec) (msec) (%)
--------------- -------- --------- --------- --------- --------- ------
fdatasync 5461 66602.924 7.330 12.196 71.980 0.42%
write 16405 941.322 0.000 0.057 2.608 0.78%
mmap, 64kb, perf trace -s
% sudo perf trace -s java -Djava.io.tmpdir=$HOME/build/tmp -jar target/fsync_compare-0.1-SNAPSHOT.jar mmap $((64<<10))
Running mmap test
Buffer contains 425 events and has byte size is 65536
Did 16384 writes. Wrote 1073741824 bytes total
...
syscall calls total min avg max stddev
(msec) (msec) (msec) (msec) (%)
--------------- -------- --------- --------- --------- --------- ------
msync 5461 69322.540 7.068 12.694 71.948 0.42%
jordansissel commented
From this branch: jordansissel@65c9ad6
channel, 64kb, perf stat
% perf stat java -Djava.io.tmpdir=$HOME/build/tmp -jar target/fsync_compare-0.1-SNAPSHOT.jar channel $((64<<10))
Running channel test
Buffer contains 425 events and has byte size is 65536
Did 16384 writes. Wrote 1073741824 bytes total
Performance counter stats for 'java -Djava.io.tmpdir=/home/jls/build/tmp -jar target/fsync_compare-0.1-SNAPSHOT.jar channel 65536':
1721.382978 task-clock (msec) # 0.026 CPUs utilized
18,201 context-switches # 0.011 M/sec
53 cpu-migrations # 0.031 K/sec
3,479 page-faults # 0.002 M/sec
<not supported> cycles
<not supported> instructions
<not supported> branches
<not supported> branch-misses
67.021048232 seconds time elapsed
mmap, 64kb, perf stat
% perf stat java -Djava.io.tmpdir=$HOME/build/tmp -jar target/fsync_compare-0.1-SNAPSHOT.jar mmap $((64<<10))
Running mmap test
Buffer contains 425 events and has byte size is 65536
Did 16384 writes. Wrote 1073741824 bytes total
Performance counter stats for 'java -Djava.io.tmpdir=/home/jls/build/tmp -jar target/fsync_compare-0.1-SNAPSHOT.jar mmap 65536':
2443.330755 task-clock (msec) # 0.036 CPUs utilized
18,223 context-switches # 0.007 M/sec
34 cpu-migrations # 0.014 K/sec
265,155 page-faults # 0.109 M/sec
<not supported> cycles
<not supported> instructions
<not supported> branches
<not supported> branch-misses
67.853303164 seconds time elapsed