Search found 18 matches

by jussssx1
Sun Mar 17, 2019 8:20 am
Forum: Submit Suggestions
Topic: Feature proposal: HDD sleep resume
Replies: 1
Views: 3368

Feature proposal: HDD sleep resume

Hello, One of the great advantages of primocache is to cache writes to HDD. However, most mechanical hard disks enter into sleep mode when not used actively, and the spin-up time can be up to 4 seconds. Currently primocache starts caching the writes, but the HDD wakes only when the buffer is about t...
by jussssx1
Sun Jan 27, 2019 6:48 am
Forum: Technical Support
Topic: Spectre/Meltdown impact
Replies: 9
Views: 2244

Re: Spectre/Meltdown impact

Yes, the results you got are similar (or even slightly better) than what we have observed. Spectre/Meltdown impacts
latency and that's why fast transactions become significantly slower (e.g. high speed storage, such as primocache or
optane; and fast network io)

-Jussi
by jussssx1
Thu Jan 10, 2019 6:35 pm
Forum: Submit Suggestions
Topic: targeting 10 MIOPS performance
Replies: 1
Views: 2654

targeting 10 MIOPS performance

Could you consider if some of the elements of LLFIO can be implemented into the PrimoCache?
More about LLFIO: https://ned14.github.io/llfio/

thanks!

-jussi
by jussssx1
Sat Dec 22, 2018 8:54 pm
Forum: Submit Suggestions
Topic: PrimoCache & Nvme in 2018, enough to compete with optane 905P?
Replies: 11
Views: 6608

Re: PrimoCache & Nvme in 2018, enough to compete with optane 905P?

well.. there are couple of items which make Optane a lot faster than typical SSD: First - the consistency of low latency: Regardless of my load type, optane 900p will always have less than .01 ms latency (and I run some heavy transaction loads). Secondly - optane will not use nor require TRIM - so e...
by jussssx1
Thu Dec 20, 2018 6:49 am
Forum: Submit Suggestions
Topic: PrimoCache & Nvme in 2018, enough to compete with optane 905P?
Replies: 11
Views: 6608

Re: PrimoCache & Nvme in 2018, enough to compete with optane 905P?

I have tested primocache extensively with samsung nvme drives and optane 900p. Primocache further increases low queue depth transfer speeds to 600-700Mb/s (from optane's 200-300 Mb/s) but the real-world performance does not increase (at least with my workloads). the issue seems to be with a) windows...
by jussssx1
Sun Mar 25, 2018 5:56 pm
Forum: Technical Support
Topic: PrimoCache Server in combination with a Intel 900P Optane card
Replies: 38
Views: 13394

Re: PrimoCache Server in combination with a Intel 900P Optane card

ok, thank you for the information! It would be nice to see some comparison results with full spectre&meltdown patches applied. Those seem to take huge toll on 4k IO
by jussssx1
Sun Mar 25, 2018 12:02 pm
Forum: Technical Support
Topic: PrimoCache and File Based Synchronization
Replies: 8
Views: 3336

Re: PrimoCache and File Based Synchronization

Has anyone been able to confirm the issue you are running into, jussssx1? Can you elaborate on the exact behavior and how we may be able to reproduce it? Axel Hello Axel; After applying KB4090914 we have not seen the issue anymore. It might have been related to file flush kernel issue; see https://...
by jussssx1
Sun Mar 25, 2018 11:58 am
Forum: Technical Support
Topic: PrimoCache Server in combination with a Intel 900P Optane card
Replies: 38
Views: 13394

Re: PrimoCache Server in combination with a Intel 900P Optane card

wow!! nice speeds & high quality article! Just one question: did you have meltdown & spectre patches applied?
by jussssx1
Fri Mar 09, 2018 6:46 am
Forum: Technical Support
Topic: PrimoCache and File Based Synchronization
Replies: 8
Views: 3336

Re: PrimoCache and File Based Synchronization

what type of machines do you have; are they multi-socket machines? We experienced some hickups with multi-socket systems because rapid file IO's sometimes failed (file based oltp apps). We did not experience the issue without primocache, but the issue may be related to windows kernel bug that Bruce ...
by jussssx1
Wed Feb 14, 2018 11:30 am
Forum: Technical Support
Topic: PrimoCache Server in combination with a Intel 900P Optane card
Replies: 38
Views: 13394

Re: PrimoCache Server in combination with a Intel 900P Optane card

Hello.. i have tested 900p extensively with dual xeon configuration (and primocache 3.0.2). Primocache significantly speeds certain DB operations even with optane (4k-64kb transfers with higher queue depth). There are couple of issues though: A) it seems that there is a windows glitch that (only hap...