http://d.hatena.ne.jp/happs/20100912/1284253155 を参考に stress コマンドで I/O 負荷をかけてみた。
インストールする。
[root@****** ~]# yum install stress Is this ok [y/N]: y ... Is this ok [y/N]: y ... Installed: stress.x86_64 0:1.0.4-4.el6 Complete!
I/O負荷をかけてみる。
[root@****** ~]# stress --hdd 1 --timeout 10s stress: info: [4418] dispatching hogs: 0 cpu, 0 io, 0 vm, 1 hdd stress: info: [4418] successful run completed in 10s
iostat でI/O負荷を確認する。
[root@****** ~]# iostat -dtx 1 Linux 2.6.32-358.18.1.el6.x86_64 (******.sakura.ne.jp) 09/25/13 _x86_64_ (2 CPU) 09/25/13 21:57:27 Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util vda 0.02 49.78 0.10 0.59 3.38 402.95 590.56 0.05 69.35 1.13 0.08 09/25/13 21:57:28 Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util vda 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 09/25/13 21:57:29 Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util vda 0.00 101269.00 7.00 1081.00 288.00 818800.00 752.84 9.71 8.92 0.32 34.70 09/25/13 21:57:30 Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util vda 0.00 125653.00 0.00 1160.00 0.00 965768.00 832.56 112.68 95.20 0.79 91.20 09/25/13 21:57:31 Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util vda 0.00 54667.00 0.00 471.00 0.00 388648.00 825.15 107.27 140.16 1.98 93.30 09/25/13 21:57:32 Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util vda 0.00 134311.00 0.00 1390.00 0.00 1135384.00 816.82 97.18 91.99 0.68 94.90 09/25/13 21:57:33 Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util vda 0.00 76916.00 1.00 680.00 8.00 672184.00 987.07 76.74 131.53 1.18 80.60 09/25/13 21:57:34 Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util vda 0.00 127777.00 0.00 867.00 0.00 870152.00 1003.64 110.12 101.06 1.07 93.20 09/25/13 21:57:35 Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util vda 0.00 113925.00 0.00 1061.00 0.00 1055528.00 994.84 120.27 133.35 0.94 100.00 09/25/13 21:57:36 Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util vda 0.00 164506.00 0.00 1326.00 0.00 1270216.00 957.93 82.54 58.86 0.64 85.10 09/25/13 21:57:37 Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util vda 0.00 114972.00 2.00 870.00 16.00 875536.00 1004.07 96.05 113.45 1.10 95.50 09/25/13 21:57:38 Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util vda 0.00 215669.00 0.00 1724.00 0.00 1729496.00 1003.19 115.86 65.14 0.58 100.10 09/25/13 21:57:39 Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util vda 0.00 12347.00 0.00 242.00 0.00 241360.00 997.36 71.32 321.41 2.24 54.10 09/25/13 21:57:40 Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util vda 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
おまけ
どんなシステムコールを発行しているか調べてみる。
[root@****** ~]# strace -f -c stress --hdd 1 --timeout 10s stress: info: [4430] dispatching hogs: 0 cpu, 0 io, 0 vm, 1 hdd Process 4431 attached (waiting for parent) Process 4431 resumed (parent 4430 ready) Process 4431 detached stress: info: [4430] successful run completed in 10s % time seconds usecs/call calls errors syscall ------ ----------- ----------- --------- --------- ---------------- 73.40 5.966093 5966093 1 wait4 22.34 1.815787 213 8537 write 4.26 0.346421 49489 7 close 0.00 0.000000 0 2 read 0.00 0.000000 0 8 open 0.00 0.000000 0 4 fstat 0.00 0.000000 0 11 mmap 0.00 0.000000 0 5 mprotect 0.00 0.000000 0 1 munmap 0.00 0.000000 0 1 brk 0.00 0.000000 0 1 1 access 0.00 0.000000 0 1 nanosleep 0.00 0.000000 0 1 alarm 0.00 0.000000 0 1 getpid 0.00 0.000000 0 1 clone 0.00 0.000000 0 1 execve 0.00 0.000000 0 5 unlink 0.00 0.000000 0 4 gettimeofday 0.00 0.000000 0 1 arch_prctl ------ ----------- ----------- --------- --------- ---------------- 100.00 8.128301 8593 1 total
