Dmitry V. Levin wrote:
> On Fri, Dec 15, 2006 at 11:43:38AM -0600, Kris Katterjohn wrote:
>> This simple patch dramatically reduces the number of fopen()s and
>> fclose()s used when getting random numbers from nbase_rnd.c by keeping
>> the rng device open.
>>
>> Before:
>>
>> # strace nmap -p- localhost 2>&1 | grep 'open("/dev/[au]*random"' | wc
>> 512 3584 31744
>>
>> After:
>>
>> # strace ./nmap -p- localhost 2>&1 | grep 'open("/dev/[au]*random"' | wc
>> 2 14 124
>
> You can also compare "strace -c" output to estimate effect of the change.
>
Oh cool, thanks. The only problem with trying to compare the difference
like this is that fopen() has more "stuff" in it than an open() call. If
it's just like the one in K&R (Ch. 8 or 9, I believe), it might not be a
big deal, but with what's probably in glibc, for example, it's likely
bloated -- or at least "feature-rich" :)
Of course I _am_ the one who initially counted the open()s, but I just
wanted to see how many times fopen() is called, along with the extra
stuff in it.
Thanks,
Kris Katterjohn
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Received on Dec 16 2006
Intro
