[erlang-questions] Obsolete exported functions file:raw_{read, write}_file_info/2 - why?

Joseph Norton <>
Thu Sep 15 11:25:00 CEST 2011


Hi.

I'm working on a patch for the file.erl module itself.  In the meantime, see the attached module as a working example.  We have been using this approach for benchmarking purposes since early summer.  The performance difference is dramatically better than the default file implementation.

thanks,

Joseph Norton


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On Sep 15, 2011, at 1:57 AM, erlang wrote:

>> I recommend reading the file.erl source.  It's quite instructive to see
>> how many file I/O functions are redirected to the 'file_server_2'
>> process.  For file I/O-intensive applications (e.g. Hibari and Riak I
>> know, CouchDB and RabbitMQ I'd guess), having all calls to(*)
>> file:read_file_info/1 serialized by the file server process is a source
>> of latency that we (DB authors) may desire to live without.
> 
> How did you proceed to avoid these calls and reduce latency Scott?
> Any hints?



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