Ciprian wrote:
Hi guys!
I got a question for you. Apparently kernel 2.6 is
much slower then 2.4 and about 30 times slower then
the windows one.
I'm not an OS guru, but I ran a little and very simple
test. The program bellow, as you can see, measures the
number of cycles performed in 30 seconds.
//----------------- START CODE --------------------
#include <stdio.h>
#include <time.h>
int main()
{
time_t initialTime;
time_t testTime;
long counter = 0;
double test = 1;
time(&initialTime);
testTime = initialTime;
printf("Here we go...\n");
while((testTime-initialTime) < 30)
{
time(&testTime);
test /= 10;
test *= 10;
test += 10;
test -= 10;
counter ++;
}
printf("No. of cycles: %ld\n", counter);
return 0;
}
//---------------- END CODE -------------------
In windows were performed about 300 millions cycles,
while in Linux about 10 millions. This test was run on
Fedora 4 and Suse 9.2 as Linux machines, and Windows
XP Pro with VS .Net 2003 on the MS side. My CPU is a
P4 @3GHz HT 800MHz bus.
I published my little test on several forums and I
wasn't the only one who got these results. All the
other users using 2.6 kernel obtained similar results
regardless of the CPU they had (Intel or AMD).
Also I downloaded the latest kernel (2.6.12),
configured it specifically for my machine, disabled
all the modules I don't need and compiled it. The
result was a 1.7 MB kernel on which KDE moves faster,
but the processing speed it's the same - same huge
speed ratios.
Also, it shouldn't have any importance, but my HDD is
SATA so the specific modules were required. I don't
think its SCSI modules have any impact on the
processing speed, but you know more on the kernel
architecture then I do.
Now, can anyone explain this and suggest what other
optimizations I should use? The 2.4 version was a lot
faster. I thought the newer versions were supposed to
work faster (or at least just as fast) AND to offer
extra features.
Any help would appreciate.
Thanks,
Ciprian
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Want to increase the latest kernel "speed" by 5 times ? Use the
follwoing code instead. :)
// -- Start Code
#include <stdio.h>
#include <time.h>
int main()
{
clock_t initialTime;
clock_t testTime;
long counter = 0;
double test = 1;
initialTime = clock() / CLOCKS_PER_SEC;
testTime = initialTime;
printf("Here we go...\n");
while((testTime-initialTime) < 30)
{
testTime = clock()/CLOCKS_PER_SEC;
test /= 10;
test *= 10;
test += 10;
test -= 10;
counter ++;
}
printf("No. of cycles: %ld\n", counter);
return 0;
}
// ---- End code
so essentially you are timing just the time() function.
HTH,
Puneet
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