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Scalability of DAOS on RAM simulation

Wu Huijun
 

Hi all,

Has anyone tried the max scalability of DAOS while using DRAM to simulate NVDIMM?

We continuously saw one or more server instances exited and several clients reported crt timeout when the number of clients increases. 

Does it mean that DAOS only scales well under 3dxpoint but not the case for DRAM? Thanks!

Cheers,
Hector 

Lombardi, Johann
 

Hi there,

 

We regularly test DAOS over DRAM (to emulate SCM). We found out that fallocate(2) isn’t always reliable over tmpfs and it is better to set “PMEMOBJ_CONF=prefault.at_create=1;” in the server’s yaml file if you want to have stable performance.

 

Regarding scalability, we have tested DAOS at reasonable scale with both OPA and verbs, but we are still investigating several network-related issues (e.g. FI_UNIVERSE_SIZE limitation) that happen when scaling the total number of nodes (i.e. client + server nodes).

 

Cheers,

Johann

 

From: <daos@daos.groups.io> on behalf of Wu Huijun <huijunw91@...>
Reply-To: "daos@daos.groups.io" <daos@daos.groups.io>
Date: Saturday 6 June 2020 at 14:11
To: "daos@daos.groups.io" <daos@daos.groups.io>
Subject: [daos] Scalability of DAOS on RAM simulation

 

Hi all,

 

Has anyone tried the max scalability of DAOS while using DRAM to simulate NVDIMM?

 

We continuously saw one or more server instances exited and several clients reported crt timeout when the number of clients increases. 

 

Does it mean that DAOS only scales well under 3dxpoint but not the case for DRAM? Thanks!

 

Cheers,

Hector 

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