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fread multiple files

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fread multiple files

Subject: fread multiple files
From: Tomasz Koziara <email@hidden>
Date: Fri, 25 Sep 2009 18:27:57 +0100

Hi

An MPI code I use outputs 3 * N files, where N is the number of processors. Then I am using a serial code to post-process the results. The post-processor is single-threaded and for every time instant reads a chunk of data from each of 3 *N files. I noticed that most of the time (nearly 50%) is spent in:

__spin_lock
pthread_mutex_lock
fread
pthread_mutex_unlock
flockfile
funlockfile

I am wondering whether those of you who know more about optimizing IO could advice me on how to make this reading more efficient.

Regards
Tomek
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