Re: More memory more jitters?

On 2015-11-14 09:11, CHENG Yuk-Pong, Daniel wrote: Hi List, I have read the Gotcha[1] page: Files with a lot of random writes can become heavily fragmented (1+ extents) causing trashing on HDDs and excessive multi-second spikes of CPU load on systems with an SSD or **large amount a

Re: More memory more jitters?

On 14 November 2015 at 15:11, CHENG Yuk-Pong, Daniel wrote: > > Background info: > > I am running a heavy-write database server with 96GB ram. In the worse > case it cause multi minutes of high cpu loads. Systemd keeping kill > and restarting services, and old job don't die

Re: More memory more jitters?

Duncan posted on Sat, 14 Nov 2015 16:37:14 + as excerpted: > Hugo Mills posted on Sat, 14 Nov 2015 14:31:12 + as excerpted: > >>> I have read the Gotcha[1] page: >>> >>>Files with a lot of random writes can become heavily fragmented >>> (1+ extents) causing trashing on HDDs and

More memory more jitters?

Hi List, I have read the Gotcha[1] page: Files with a lot of random writes can become heavily fragmented (1+ extents) causing trashing on HDDs and excessive multi-second spikes of CPU load on systems with an SSD or **large amount a RAM**. Why could large amount of memory worsen the

Re: More memory more jitters?

On Sat, Nov 14, 2015 at 10:11:31PM +0800, CHENG Yuk-Pong, Daniel wrote: > Hi List, > > > I have read the Gotcha[1] page: > >Files with a lot of random writes can become heavily fragmented > (1+ extents) causing trashing on HDDs and excessive multi-second > spikes of CPU load on systems

Re: More memory more jitters?

Hugo Mills posted on Sat, 14 Nov 2015 14:31:12 + as excerpted: >> I have read the Gotcha[1] page: >> >>Files with a lot of random writes can become heavily fragmented >> (1+ extents) causing trashing on HDDs and excessive multi-second >> spikes of CPU load on systems with an SSD or