Re: [PATCH] lazy freeing of memory through MADV_FREE

Rik van Riel
2007-04-23T03:50:39Z

Rik van Riel wrote:
> Nick Piggin wrote:
>> Rik van Riel wrote:
>>> Nick Piggin wrote:
>>>
>>>> Rik van Riel wrote:
>>
>>>>> Here are the transactions/seconds for each combination:
>
> I've added a 5th column, with just your mmap_sem patch and
> without my madv_free patch. It is run with the glibc patch,
> which should make it fall back to MADV_DONTNEED after the
> first MADV_FREE call fails.
>
>>>>> vanilla new glibc madv_free kernel madv_free + mmap_sem
>>>>> mmap_sem
>>>>> threads
>>>>>
>>>>> 1 610 609 596 545 534
>>>>> 2 1032 1136 1196 1200 1180
>>>>> 4 1070 1128 2014 2024 2027
>>>>> 8 1000 1088 1665 2087 2089
>>>>> 16 779 1073 1310 1999 2012

Now that I think about it - this is all with the rawhide kernel
configuration, which has an ungodly number of debug config
options enabled.

I should try this with a more normal kernel, on various different
systems.

It would also be helpful if other people tried this same benchmark,
and others, on their systems.