On Sun, Jul 16, 2017 at 2:11 AM, Saurabh Kadekodi <saukad@xxxxxxxxxx> wrote: > Hi, > > I am a PhD student studying file and storage systems and I am currently conducting research on local file system aging. My research aims at understanding realistic aging patterns and analyzing the effects of aging on file system data structures and its performance. For this purpose, I would like to capture characteristics of naturally aged file systems (i.e. not aged via synthetic workload generators). > > In order to facilitate this profile capture, I have written a shell / python based profiling tool (fsagestats - https://github.com/saurabhkadekodi/fsagestats) that does a file system tree walk and captures different characteristics (file age, file size and directory depth) of files and directories and produces distributions. I do not care about file names or data within each file. It also runs xfs_db in order to capture the free space fragmentation, file fragmentation, directory fragmentation and overall fragmentation; all of which are directly correlated with the file system performance. It dumps the results in the results dir, which is to be specified when you run fsagestats. You can send me the aging profile by tarring up the results directory and sending it via email. > > Since I do not have access to XFS systems that see a lot of churn, I am reaching out to the XFS community in order to find volunteers willing to run my script and capture their XFS aging profile. Please feel free to modify the script as per your installation or as you see fit. Since fsagestats collects no private information, I eventually intend to host these profiles publicly (unless explicitly requested not to) to aid other researchers / enthusiasts. > > In case you have any questions on concerns, please let me know. I have a nicely aged filesystem (1 TB) on our dev server with around 10 million files on it. I will not run a script that executes two xfs_io calls *for each file* on it. Why don't you just use Python's stat.stat to get at the ctime and the size? -- To unsubscribe from this list: send the line "unsubscribe linux-xfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
