Messages in this thread | | | Date | Mon, 23 Apr 2007 16:53:03 -0700 | From | "H. Peter Anvin" <> | Subject | Re: Question about Reiser4 |
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Theodore Tso wrote: > > One of the big problems of using a filesystem as a DB is the system > call overheads. If you use huge numbers of tiny files, then each > attempt read an atom of information from the DB takes three system > calls --- an open(), read(), and close(), with all of the overheads in > terms of dentry and inode cache. >
Now, to be fair, there are probably a number of cases where open/lseek/readv/close and open/lseek/writev/close would be worth doing as a single system call. The big problem as far as I can see involves EINTR handling; such a system call has serious restartability implications.
Of course, there are Ingo's syslets...
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