Messages in this thread |  | | | Date | Fri, 16 Sep 2011 09:19:30 -0400 | | From | Josef Bacik <> | | Subject | Re: Improve lseek scalability v3 |
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On Fri, Sep 16, 2011 at 07:00:55AM -0600, Matthew Wilcox wrote: > On Thu, Sep 15, 2011 at 04:06:46PM -0700, Andi Kleen wrote: > > Currently generic_file_llseek users synchronize all on the inode i_mutex, > > which is very heavy handed because it affects even different processes. > > > > This patchkit attempts to make generic_file_llseek (mostly) lockless. > > Yes, but, are there any real workloads which care? I know will-it-scale > says that lseek doesn't scale, but any real app which has a seek-heavy > workload is surely using pread()/pwrite() by now ... after all, they > were in UNIX98 so they've been a standard for 13 years. >
Apparently postgresql uses lseek heavily
http://rhaas.blogspot.com/2011/08/linux-and-glibc-scalability.html
Thanks,
Josef
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