search for: swappin

Displaying 6 results from an estimated 6 matches for "swappin".

Did you mean: swapping
2015 Jun 05
1
Effectiveness of CentOS vm.swappiness
...y" Uckelmann wrote: > >> How can I further debug this >> problem and find out what's the culprit? > > It's working as designed. Sadly. It is just my first time I see this behaviour to this extent/on so many servers. So you can say that I'm kind of a newbie in swapping ;) > If you don't explicitly lock things into memory, file I/O can and will > cause idle pages to get pushed out. It happens less often if you > manipulate swappines. So, is a swappiness value of 60 not recommended for servers? I worked with hundreds of servers (swappiness 60) on a...
2015 Jun 05
6
Effectiveness of CentOS vm.swappiness
...it's very low. AFAIK it's, as you already suggested, just that some (probably unused) parts are swapped out. But, some of those parts are the salt-minion, php-fpm or mysqld. All services which are important for us and which suffer badly from being swapped out. I already made some tests with swappiness 10 which mildly made it better. But there still was swap usage. So I tend to set swappiness to 1. Which I don't like to do, since those default values aren't there for nothing. Is it possible that this happens because the servers are VMs on an ESX-server. How could that affect this? How...
2015 Jun 05
0
Effectiveness of CentOS vm.swappiness
.../questions/196725/how-to-mlock-all-pages-of-a-process-tree-from-console (I've always only done this with my own code explicitly calling mlock) If you don't explicitly lock things into memory, file I/O can and will cause idle pages to get pushed out. It happens less often if you manipulate swappines. -- greg
2018 Sep 18
1
Re: NUMA issues on virtualized hosts
...gt; Bad news is, that iozone is still the same. There might be some > misunderstanding. > > I have to cases: > > 1) cache=unsafe. In this case, I can see that hypervizor is prone to swap. > Swap a lot. It usually eats whole swap partition and kswapd is running on 100% > CPU. swappines, dirty_ration and company do not improve things at all. > However, I believe, this is just wrong option for scratch disks where one can > expect huge I/O load. Moreover, the hypevizor is poor machine with only low > memory left (ok, in my case about 10GB available), so it does not make s...
2018 Sep 17
2
Re: NUMA issues on virtualized hosts
On 09/14/2018 03:36 PM, Lukas Hejtmanek wrote: > Hello, > > ok, I found that cpu pinning was wrong, so I corrected it to be 1:1. The issue > with iozone remains the same. > > The spec is running, however, it runs slower than 1-NUMA case. > > The corrected XML looks like follows: [Reformated XML for better reading] <cpu mode="host-passthrough">
2018 Sep 17
0
Re: NUMA issues on virtualized hosts
...previous wrong case. So far so good. Bad news is, that iozone is still the same. There might be some misunderstanding. I have to cases: 1) cache=unsafe. In this case, I can see that hypervizor is prone to swap. Swap a lot. It usually eats whole swap partition and kswapd is running on 100% CPU. swappines, dirty_ration and company do not improve things at all. However, I believe, this is just wrong option for scratch disks where one can expect huge I/O load. Moreover, the hypevizor is poor machine with only low memory left (ok, in my case about 10GB available), so it does not make sense to use tha...