Re: numastats updates

On Thu, Apr 03, 2014 at 02:45:27PM +0400, Stanislav Kholmanskikh wrote:
> In LTP we have a test - numa01.sh (https://github.com/linux-test-project/ltp/blob/master/testcases/kernel/numa/numa01.sh)

numactl has similar tests

> 
> In general, this script does something like:
>   * numastat > /tmp/before
>   * starts a binary with the specified numa memory policy using
> numactl (or a like):
>     numactl --interleave=all get_some_memory_with_malloc_and_write_it
>   * `sleep` for few seconds
>   * numastat > /tmp/after
>   * compares /tmp/before and /tmp/after to check that the numa policy
> was applied the right way
> 
> But the problem is that on a host with many NUMA nodes (8) the process
> of updating that numastats statistics takes some time. Even 10 seconds
> may be not enough. Therefore the test fails.
> 
> Is there a direct or indirect way to force the kernel to update the
> NUMA statistics?

Not currently. It depends on how much memory you have and subsequent
operations. I guess would need to add one.


-Andi