Sou novo em programação & Linux.
Depois que eu terminei meus programas (faço algumas IOs), descobri que o iowait é muito alto (~ 65%) enquanto o throughput (~ 5M / s lê + ~ 5M / s escreve) e IOPS (50 ~ 100 QPS) baixo.
iostat -xm 1 relatórios:
avg-cpu: %user %nice %system %iowait %steal %idle
12.56 0.00 7.77 64.63 0.00 15.04
Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await r_await w_await svctm %util
sda 0.00 0.00 12.00 1.00 0.05 0.00 8.00 0.00 0.31 0.33 0.00 0.31 0.40
sdm 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sdg 733.00 0.00 58.00 30.00 3.07 5.23 193.09 0.58 6.50 5.10 9.20 5.00 44.00
sde 1871.00 0.00 107.00 44.00 8.40 2.82 152.26 1.90 14.68 13.50 17.55 5.30 80.00
sdb 773.00 0.00 65.00 30.00 4.00 4.70 187.62 0.88 9.18 8.18 11.33 5.39 51.20
sdj 747.00 0.00 48.00 27.00 3.56 3.03 179.84 0.86 11.52 11.25 12.00 6.56 49.20
sdc 593.00 0.00 46.00 37.00 2.61 3.92 161.16 0.92 11.13 11.13 11.14 6.55 54.40
sdk 1372.00 0.00 79.00 32.00 6.09 3.82 182.85 1.54 14.77 14.68 15.00 6.23 69.20
sdd 911.00 0.00 56.00 31.00 3.81 1.63 128.00 0.74 8.32 7.29 10.19 6.16 53.60
sdf 269.00 0.00 52.00 34.00 1.46 2.74 99.91 0.70 8.09 6.85 10.00 6.33 54.40
sdi 598.00 0.00 59.00 36.00 2.79 5.49 178.36 1.01 10.57 9.02 13.11 6.15 58.40
sdl 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sdh 437.00 0.00 47.00 24.00 2.04 0.94 85.75 0.59 8.51 7.32 10.83 5.69 40.40
avg-cpu: %user %nice %system %iowait %steal %idle
13.31 0.00 7.52 64.55 0.00 14.63
Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await r_await w_await svctm %util
sda 0.00 0.00 15.00 0.00 0.06 0.00 8.00 0.00 0.27 0.27 0.00 0.27 0.40
sdm 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sdg 680.00 0.00 56.00 32.00 3.29 5.12 195.73 1.08 12.27 9.36 17.38 7.23 63.60
sde 466.00 0.00 62.00 34.00 2.26 3.72 127.50 0.82 8.50 6.26 12.59 4.88 46.80
sdb 506.00 0.00 66.00 34.00 2.46 5.39 160.72 1.27 12.76 8.79 20.47 5.92 59.20
sdj 499.00 0.00 46.00 22.00 2.07 2.18 128.12 0.58 8.29 7.39 10.18 6.29 42.80
sdc 1118.00 0.00 76.00 38.00 4.85 3.82 155.79 1.13 9.68 8.11 12.84 6.25 71.20
sdk 1242.00 0.00 93.00 30.00 5.47 4.97 173.85 1.26 10.11 8.47 15.20 5.89 72.40
sdd 671.00 0.00 52.00 19.00 3.15 0.62 108.96 0.77 11.04 10.77 11.79 6.65 47.20
sdf 686.00 0.00 49.00 34.00 2.99 2.70 140.34 0.87 10.31 9.71 11.18 6.55 54.40
sdi 637.00 0.00 58.00 31.00 2.97 2.79 132.40 0.74 8.36 6.97 10.97 5.62 50.00
sdl 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sdh 374.00 0.00 50.00 32.00 1.83 3.70 138.05 0.67 8.20 5.92 11.75 4.98 40.80
alguém pode ajudar? thx antecipadamente. Como posso consertar isso?
Tags performance programming io linux read