On Fri, Dec 6, 2019 at 5:49 AM Mathieu Desnoyers <mathieu.desnoyers@efficios.com> wrote:

----- On Dec 5, 2019, at 8:17 PM, Yuxin Ren <ryx@gwmail.gwu.edu> wrote:
Hi,
I am a student, and learning RCU now, but still know very little about it.
Are there any documents/papers/materials which (in)formally define and explain RCU consistency guarantees?

You may want to have a look at

User-Level Implementations of Read-Copy Update
Article in IEEE Transactions on Parallel and Distributed Systems 23(2):375 - 382 · March 2012

Thanks for your info.

However, I do not think URCU talks about any consistency model formally.

From previous communication with Paul, he said RCU is not designed for linearizability, and it is totally acceptable that RCU is not linearizable.

However, I am curious how to accurately/formally Characterize RCU consistency model/guarantees

as a starting point.

Thanks,

Mathieu

I know there are some consistency models in the database area (such as PRAM, Read Uncommitted, etc) from https://jepsen.io/consistency and [1].
How does RCU related to those consistency models?

I also found some comments online (One key distinction is that both MVCC and RLU provide much stronger consistency guarantees to readers than does RCU ...) (https://lwn.net/Articles/777036/).
I do not understand how we reason/dresibe/compare the consistency guarantees. ( I even do not know what consistency guarantees provided by RCU formally)
Could someone explain this to me?

[1] Bailis, P., Davidson, A., Fekete, A., Ghodsi, A., Hellerstein, J. M., & Stoica, I. (2013). Highly available transactions: Virtues and limitations. Proceedings of the VLDB Endowment, 7(3), 181-192.

Thanks
Yuxin

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Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com