[ Comments below, in line ] On Wednesday 27 April 2011 at 12:57 pm, Maurice penned about "Re: [VBox-users] Disk thrashing at start of 4.04 & 4.06 sessions"
> On 2011-04-26 at 20:40 Pablo said: > > > The start/end time of the VirtualBox run. > > 17:49:06 17:50:06 Hi Maurice, During the above start/end time, I don't see any evidence of your disk thrashing. I've snipped out high resource consumption of both CPU and Disk below. What I see is typical `%system' utilization but nothing extraordinary. What exactly are the symptoms? Do you have a repeatable test case? An interesting point is I do see your disk getting maxed out at 17:50:28 - 17:58:34 (see the last three lines). But that was outside of your run. Thx! > > The `sar' data > > 17:49:21 CPU %user %nice %system %iowait %steal > %idle > 17:49:24 all 1.57 7.85 11.98 0.50 0.00 > 78.10 > 17:49:24 0 0.33 29.14 41.72 0.00 0.00 > 28.81 > 17:49:24 1 1.33 0.00 2.67 1.00 0.00 > 95.00 > 17:49:24 2 2.94 0.65 1.63 1.31 0.00 > 93.46 > 17:49:24 3 1.97 1.64 1.97 0.00 0.00 > 94.43 > > 17:49:24 CPU %user %nice %system %iowait %steal > %idle > 17:49:27 all 1.87 0.98 7.01 12.47 0.00 > 77.67 > 17:49:27 0 1.67 0.67 9.70 29.77 0.00 > 58.19 > 17:49:27 1 1.60 0.64 3.85 11.54 0.00 > 82.37 > 17:49:27 2 1.93 1.29 2.89 5.14 0.00 > 88.75 > 17:49:27 3 2.31 0.99 11.55 3.63 0.00 > 81.52 > > 17:49:27 CPU %user %nice %system %iowait %steal > %idle > 17:49:30 all 2.70 1.48 15.66 11.15 0.00 > 69.02 > 17:49:30 0 2.33 1.33 23.92 31.89 0.00 > 40.53 > 17:49:30 1 2.91 1.62 22.33 11.33 0.00 > 61.81 > 17:49:30 2 2.61 1.95 12.70 0.98 0.00 > 81.76 > 17:49:30 3 2.96 0.66 4.28 1.32 0.00 > 90.79 > > 17:49:30 CPU %user %nice %system %iowait %steal > %idle > 17:49:33 all 2.63 2.14 19.42 2.14 0.00 > 73.66 > 17:49:33 0 1.99 5.63 1.66 0.00 0.00 > 90.73 > 17:49:33 1 3.95 0.99 39.80 2.96 0.00 > 52.30 > 17:49:33 2 2.31 1.98 34.65 1.98 0.00 > 59.08 > 17:49:33 3 2.29 0.33 1.63 2.94 0.00 > 92.81 > > 17:49:33 CPU %user %nice %system %iowait %steal > %idle > 17:49:36 all 2.47 0.99 18.30 2.23 0.00 > 76.01 > 17:49:36 0 0.33 1.67 46.82 0.00 0.00 > 51.17 > 17:49:36 1 2.60 1.62 20.13 0.00 0.00 > 75.65 > 17:49:36 2 2.62 0.33 3.28 2.62 0.00 > 91.15 > 17:49:36 3 4.32 0.33 3.32 6.31 0.00 > 85.71 > > 17:49:36 CPU %user %nice %system %iowait %steal > %idle > 17:49:39 all 5.28 1.73 26.42 0.58 0.00 > 65.98 > 17:49:39 0 0.00 2.68 93.31 0.00 0.00 > 4.01 > 17:49:39 1 4.28 0.66 5.26 1.64 0.00 > 88.16 > 17:49:39 2 8.55 2.63 4.61 0.00 0.00 > 84.21 > 17:49:39 3 7.89 1.32 3.95 0.66 0.00 > 86.18 > > 17:49:39 CPU %user %nice %system %iowait %steal > %idle > 17:49:42 all 3.15 0.99 25.33 0.66 0.00 > 69.87 > 17:49:42 0 2.32 0.66 20.86 0.00 0.00 > 76.16 > 17:49:42 1 0.66 3.31 77.15 0.00 0.00 > 18.87 > 17:49:42 2 5.65 0.00 1.33 0.33 0.00 > 92.69 > 17:49:42 3 3.95 0.00 1.97 2.63 0.00 > 91.45 > > 17:49:42 CPU %user %nice %system %iowait %steal > %idle > 17:49:45 all 2.15 1.91 24.11 0.58 0.00 > 71.25 > 17:49:45 0 1.99 4.98 41.86 0.00 0.00 > 51.16 > 17:49:45 1 0.66 1.99 52.49 0.00 0.00 > 44.85 > 17:49:45 2 3.29 0.66 1.32 0.00 0.00 > 94.74 > 17:49:45 3 2.65 0.00 1.32 1.99 0.00 > 94.04 > > 17:49:45 CPU %user %nice %system %iowait %steal > %idle > 17:49:48 all 5.73 5.56 16.18 1.77 0.00 > 70.77 > 17:49:48 0 2.69 11.11 34.01 1.01 0.00 > 51.18 > 17:49:48 1 8.39 7.66 16.42 1.09 0.00 > 66.42 > 17:49:48 2 6.23 3.28 11.80 1.64 0.00 > 77.05 > 17:49:48 3 5.84 0.32 2.92 3.25 0.00 > 87.66 > > 17:50:06 CPU %user %nice %system %iowait %steal > %idle > 17:50:09 all 5.27 4.77 22.39 1.73 0.00 > 65.84 > 17:50:09 0 6.25 5.59 17.11 6.91 0.00 > 64.14 > 17:50:09 1 8.20 1.31 5.25 0.00 0.00 > 85.25 > 17:50:09 2 0.98 8.85 56.39 0.00 0.00 > 33.77 > 17:50:09 3 5.92 3.62 10.86 0.00 0.00 > 79.61 > > 17:50:09 CPU %user %nice %system %iowait %steal > %idle > 17:50:12 all 2.05 6.08 19.39 2.55 0.00 > 69.93 > 17:50:12 0 1.67 8.03 18.06 0.67 0.00 > 71.57 > 17:50:12 1 1.65 6.27 24.09 0.00 0.00 > 67.99 > 17:50:12 2 2.86 1.27 5.40 7.62 0.00 > 82.86 > 17:50:12 3 2.01 9.06 30.20 1.68 0.00 > 57.05 > > > [root@newpc ~]# sar -dp 3 40 > Linux 2.6.33.7-desktop-2mnb (newpc.mab.unregistered) 27/04/11 > _i686_ (4 CPU) > > 17:49:19 DEV tps rd_sec/s wr_sec/s avgrq-sz avgqu-sz > await svctm %util > 17:49:22 sda 0.00 0.00 0.00 0.00 0.00 > 0.00 0.00 0.00 > 17:49:22 sdb 63.67 3930.67 98.67 63.29 0.14 > 2.20 1.18 7.53 > 17:49:22 fd0 0.00 0.00 0.00 0.00 0.00 > 0.00 0.00 0.00 > > 17:49:22 DEV tps rd_sec/s wr_sec/s avgrq-sz avgqu-sz > await svctm %util > 17:49:25 sda 0.00 0.00 0.00 0.00 0.00 > 0.00 0.00 0.00 > 17:49:25 sdb 43.67 2845.33 0.00 65.16 0.29 > 6.73 1.97 8.60 > 17:49:25 fd0 0.00 0.00 0.00 0.00 0.00 > 0.00 0.00 0.00 > > 17:49:25 DEV tps rd_sec/s wr_sec/s avgrq-sz avgqu-sz > await svctm %util > 17:49:28 sda 0.00 0.00 0.00 0.00 0.00 > 0.00 0.00 0.00 > 17:49:28 sdb 381.00 43074.67 66.67 113.23 1.60 > 4.21 2.23 85.13 > 17:49:28 fd0 0.00 0.00 0.00 0.00 0.00 > 0.00 0.00 0.00 > > 17:49:28 DEV tps rd_sec/s wr_sec/s avgrq-sz avgqu-sz > await svctm %util > 17:49:31 sda 0.00 0.00 0.00 0.00 0.00 > 0.00 0.00 0.00 > 17:49:31 sdb 193.00 27728.00 0.00 143.67 0.49 > 2.55 1.38 26.70 > 17:49:31 fd0 0.00 0.00 0.00 0.00 0.00 > 0.00 0.00 0.00 > > 17:49:31 DEV tps rd_sec/s wr_sec/s avgrq-sz avgqu-sz > await svctm %util > 17:49:34 sda 0.00 0.00 0.00 0.00 0.00 > 0.00 0.00 0.00 > 17:49:34 sdb 62.67 21.33 1368.00 22.17 1.05 > 16.72 0.69 4.30 > 17:49:34 fd0 0.00 0.00 0.00 0.00 0.00 > 0.00 0.00 0.00 > > 17:50:22 DEV tps rd_sec/s wr_sec/s avgrq-sz avgqu-sz > await svctm %util > 17:50:25 sda 0.00 0.00 0.00 0.00 0.00 > 0.00 0.00 0.00 > 17:50:25 sdb 143.67 31970.67 0.00 222.53 47.08 > 191.54 3.38 48.57 > 17:50:25 fd0 0.00 0.00 0.00 0.00 0.00 > 0.00 0.00 0.00 > > 17:50:25 DEV tps rd_sec/s wr_sec/s avgrq-sz avgqu-sz > await svctm %util > 17:50:28 sda 0.00 0.00 0.00 0.00 0.00 > 0.00 0.00 0.00 > 17:50:28 sdb 264.67 97568.00 53.33 368.85 133.21 > 469.27 3.78 100.00 > 17:50:28 fd0 0.00 0.00 0.00 0.00 0.00 > 0.00 0.00 0.00 > > 17:50:28 DEV tps rd_sec/s wr_sec/s avgrq-sz avgqu-sz > await svctm %util > 17:50:31 sda 0.00 0.00 0.00 0.00 0.00 > 0.00 0.00 0.00 > 17:50:31 sdb 281.67 92888.00 0.00 329.78 69.16 > 339.11 3.55 100.00 > 17:50:31 fd0 0.00 0.00 0.00 0.00 0.00 > 0.00 0.00 0.00 > > 17:50:31 DEV tps rd_sec/s wr_sec/s avgrq-sz avgqu-sz > await svctm %util > 17:50:34 sda 0.00 0.00 0.00 0.00 0.00 > 0.00 0.00 0.00 > 17:50:34 sdb 260.67 70440.00 0.00 270.23 100.97 > 265.87 3.84 100.00 > 17:50:34 fd0 0.00 0.00 0.00 0.00 0.00 > 0.00 0.00 0.00 > > 17:50:34 DEV tps rd_sec/s wr_sec/s avgrq-sz avgqu-sz > await svctm %util > 17:50:37 sda 0.00 0.00 0.00 0.00 0.00 > 0.00 0.00 0.00 > 17:50:37 sdb 69.00 44626.67 40.00 647.34 34.46 > 990.45 5.37 37.07 > 17:50:37 fd0 0.00 0.00 0.00 0.00 0.00 > 0.00 0.00 0.00 > -- Pablo Sanchez 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