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Top Forums Programming Help -fwrite consuming lot of memory !!! Post 78437 by jim mcnamara on Tuesday 19th of July 2005 04:08:13 PM
Old 07-19-2005
You can try using the open() system call with O_SYNC flag, then call write() every 1MB of data.

O_SYNC turns off file buffering, in that every call to write waits until the underlying hardware has completed writing the data.

For fwrite(), setvbuf() and setbuf() do somewhat the same thing.

A word of warning: turning off buffering completely is a very bad idea in terms of performance. Especially on writing really big files.
 

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explain_fwrite_or_die(3)				     Library Functions Manual					  explain_fwrite_or_die(3)

NAME
explain_fwrite_or_die - binary stream output and report errors SYNOPSIS
#include <libexplain/fwrite.h> size_t explain_fwrite_or_die(const void *ptr, size_t size, size_t nmemb, FILE *fp); DESCRIPTION
The explain_fwrite_or_die function is used to call the fwrite(3) system call. On failure an explanation will be printed to stderr, obtained from explain_fwrite(3), and then the process terminates by calling exit(EXIT_FAILURE). This function is intended to be used in a fashion similar to the following example: size_t result = explain_fwrite_or_die(ptr, size, nmemb, fp); ptr The ptr, exactly as to be passed to the fwrite(3) system call. size The size, exactly as to be passed to the fwrite(3) system call. nmemb The nmemb, exactly as to be passed to the fwrite(3) system call. fp The fp, exactly as to be passed to the fwrite(3) system call. Returns: This function only returns on success. On failure, prints an explanation and exits. SEE ALSO
fwrite(3) binary stream output explain_fwrite(3) explain fwrite(3) errors exit(2) terminate the calling process COPYRIGHT
libexplain version 0.52 Copyright (C) 2008 Peter Miller explain_fwrite_or_die(3)
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