Emmanuel Briot wrote: >> What makes disk filesystems slow is not the code run on >> the CPU...it's the operating speed of the disk-head >> actuator. >> >> It's not the filesystem that's slow, it's the DISK DRIVES >> that are slow. >> >> The disk I/O bottleneck is not the CPU overhead , it's the >> speed which the read/write head can be placed into the proper >> track position plus additional waiting for the correct sector >> to come around underneath the read/write head. >> >> There are not "slow" filesystems, only slow hard disks. >> > > You have never used Windows, I guess. Its file system is much slower > than any of those on linux, using the same disk (dual-booting). > > Now, if you can answer the question on what tools exist to simulate a > slow hard-disk if you wish, that would be extremely interesting. That > would be, I guess, a user-side file system that introduces explicit > delays. > > Now, Dave's proposal of using NFS is indeed what I have been doing so > far, but nowadays local network become so fast that the difference is > not that big. All I want here is to be able to slow down the > application while monitoring it in a profiler, which would help find > out what parts of the application are slow. > > I'll investigate the "rsize=1, wsize=1" parameters, which I do not know > about. > > Emmanuel > If you want a slow disk, you can always use a flash drive.
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