Re: missing madvise functionality
From: Rik van Riel
Date: Thu Apr 05 2007 - 03:40:14 EST
Rik van Riel wrote:
MADV_DONTNEED, unpatched, 1000 loops
real 0m13.672s
user 0m1.217s
sys 0m45.712s
MADV_DONTNEED, with patch, 1000 loops
real 0m4.169s
user 0m2.033s
sys 0m3.224s
I just noticed something fun with these numbers.
Without the patch, the system (a quad core CPU) is 10% idle.
With the patch, it is 66% idle - presumably I need Nick's
mmap_sem patch.
However, despite being 66% idle, the test still runs over
3 times as fast!
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