Metadata for Your Data
ctime-mtime Difference Statistics
The next set of statistics are for the difference between ctime and mtime., which can tell you the metadata changes (ctime) versus data changes (mtime). In the following analysis, the difference between the two (ctime/mtime) are used.
- Average ctime/mtime: 700.000 days
- Oldest ctime/mtime file: 5,153.000 days
- Youngest ctime/mtime file: 0.000 days
- Standard deviation ctime/mtime: 543.8009 days
Table 5:ctime/mtime Age Intervals
| Interval (days) | No. of files | % of Total | Cumulative % |
|---|---|---|---|
| 0–1 | 53,756 | 13.85 | 13.85 |
| 1–2 | 73 | 0.02 | 13.87 |
| 2–4 | 121 | 0.03 | 13.90 |
| 4–7 | 168 | 0.04 | 13.94 |
| 7–14 | 1,111 | 0.29 | 14.2 |
| 14–28 | 8,768 | 2.26 | 16.49 |
| 28–56 | 25,377 | 6.54 | 23.03 |
| 56–112 | 8,101 | 2.09 | 25.12 |
| 112–168 | 47,729 | 12.30 | 37.42 |
| 168–252 | 3,578 | 0.92 | 38.34 |
| 252–365 | 4,970 | 1.28 | 39.62 |
| 365–504 | 2,324 | 0.60 | 40.22 |
| 504–730 | 3,270 | 0.84 | 41.06 |
| 730–1,095 | 37,909 | 9.77 | 50.83 |
| 1,095–1,460 | 189,729 | 48.89 | 99.72 |
| 1,460–1,825 | 254 | 0.07 | 99.78 |
| 1,825–2,190 | 255 | 0.07 | 99.85 |
| 2,190–2,920 | 324 | 0.08 | 99.93 |
| 2,920–3,650 | 136 | 0.04 | 99.97 |
| 3,650–4,380 | 3 | 0.00 | 99.97 |
| 4,380–5,110 | 122 | 0.03 | 100.00 |
| 5,110–5,840 | 5 | 0.00 | 100.00 |
Table 6 lists the top 10 files with the largest ctime/mtime differences.
Table 6: Top 10 Oldest Files Based on ctime/mtime
| Rank | File | xtime/mtime Difference (days) |
|---|---|---|
| 1 | /home/laytonjb/.gkrellm2/themes/x17/bg_grid.png | 5,153.421 |
| 2 | /home/laytonjb/.gkrellm2/themes/brushed/bg_grid.png | 5,153.420 |
| 3 | /home/laytonjb/.gkrellm2/themes/brushed/bg_chart.png | 5,153.420 |
| 4 | /home/laytonjb/.gkrellm2/themes/brushed/d | 5,153.420 |
| 5 | /home/laytonjb/.gkrellm2/themes/brushed/gismrc~ | 5,153.420 |
| 6 | /home/laytonjb/.gkrellm2/themes/brushed/gkrellmrc | 4,986.920 |
| 7 | /home/laytonjb/.gkrellm2/themes/x17/host/bg_panel.png | 4,985.801 |
| 8 | /home/laytonjb/.gkrellm2/themes/x17/net/decal_net_leds.png | 4,985.801 |
| 9 | /home/laytonjb/.gkrellm2/themes/x17/frame_left.png | 4,985.801 |
| 10 | /home/laytonjb/.gkrellm2/themes/x17/frame_bottom.png | 4,985.801 |
Figure 3 is a histogram of the ctime/mtime differences of the files in the pickle.
Figure 3: Ctime/mtime histogram.
Atime Age Statistics
Atime is the change time of the file. It will change only if the actual data is changed, but not if the metadata is changed.
- Average atime age: 128.273 days
- Oldest atime: 2,030.272 days
- Youngest atime: 0.307 days
- Standard deviation atime: 98.5828 days
Table 7 lists the atime age intervals. The age is based on the atime of the files when scanned and the current time.
Table 7: Atime Age Intervals
| Interval (days) | No. of Files | % of Total | Cumulative % |
|---|---|---|---|
| 0–1 | 406 | 0.10 | 0.10 |
| 1–2 | 0 | 0.00 | 0.10 |
| 2–4 | 396 | 0.10 | 0.21 |
| 4–7 | 4,710 | 1.21 | 1.42 |
| 7–14 | 60 | 0.02 | 1.44 |
| 14–28 | 16,108 | 4.15 | 5.59 |
| 28–56 | 7,987 | 2.06 | 7.64 |
| 56–112 | 19,803 | 5.10 | 12.75 |
| 112–168 | 334,034 | 86.07 | 98.82 |
| 168–252 | 1,288 | 0.33 | 99.15 |
| 252–365 | 425 | 0.11 | 99.26 |
| 365–504 | 923 | 0.24 | 99.50 |
| 504–730 | 25 | 0.01 | 99.51 |
| 730–1,095 | 78 | 0.02 | 99.53 |
| 1,095–1,460 | 1,831 | 0.47 | 100.00 |
| 1,460–1,825 | 0 | 0.00 | 100.00 |
| 1,825–2,190 | 9 | 0.00 | 100.00 |
| 2,190–2,920 | 0 | 0.00 | 100.00 |
| 2,920–3,650 | 0 | 0.00 | 100.00 |
| 3,650–4,380 | 0 | 0.00 | 100.00 |
| 4,380–5,110 | 0 | 0.00 | 100.00 |
| 5,110–5,840 | 0 | 0.00 | 100.00 |
Table 8 lists the top 10 files based on atime (access time) when the files were scanned in the original pickle file.
Table 8: Top 10 Oldest Files Based on atime
| Rank | File | atime Age |
|---|---|---|
| 1 | /home/laytonjb/CLUSTERBUFFER/STRACE/DB/DBIx-SimplePerl-1.90/blib/script/.exists | 2,030.271 |
| 2 | /home/laytonjb/CLUSTERBUFFER/STRACE/DB/DBIx-SimplePerl-1.90/blib/man3/.exists | 2,030.271 |
| 3 | /home/laytonjb/CLUSTERBUFFER/STRACE/DB/DBIx-SimplePerl-1.90/blib/lib/auto/DBIx/SimplePerl/.exists | 2,030.271 |
| 4 | /home/laytonjb/CLUSTERBUFFER/STRACE/DB/DBIx-SimplePerl-1.90/blib/lib/DBIx/.exists | 2,030.271 |
| 5 | /home/laytonjb/CLUSTERBUFFER/STRACE/DB/DBIx-SimplePerl-1.90/blib/bin/.exists | 2,030.271 |
| 6 | /home/laytonjb/CLUSTERBUFFER/STRACE/DB/DBIx-SimplePerl-1.90/blib/arch/auto/DBIx/SimplePerl/.exists | 2,030.271 |
| 7 | /home/laytonjb/CLUSTERBUFFER/STRACE/DB/DBIx-SimplePerl-1.90/blib/arch/.exists | 2,030.271 |
| 8 | /home/laytonjb/CLUSTERBUFFER/STRACE/DB/DBIx-SimplePerl-1.90/blib/man1/.exists | 2,030.271 |
| 9 | /home/laytonjb/CLUSTERBUFFER/STRACE/DB/DBIx-SimplePerl-1.90/pm_to_blib | 2,030.271 |
| 10 | /home/laytonjb/src/CFD/CFD_2/USM3D/USM3D_DATA/RAMP/ramp1.m2 | 1,441.099 |
Figure 4: Atime histogram.