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
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