linux-kernel - Re: [PATCH] rhashtable-test: extend to test concurrency

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Message-ID: <20150816150244.GA6844@pox.localdomain>
Date:	Sun, 16 Aug 2015 17:02:44 +0200
From:	Thomas Graf <tgraf@...g.ch>
To:	Phil Sutter <phil@....cc>
Cc:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	davem@...emloft.net
Subject: Re: [PATCH] rhashtable-test: extend to test concurrency

On 08/15/15 at 12:37am, Phil Sutter wrote:
> After having tested insertion, lookup, table walk and removal, spawn a
> number of threads running operations on the same rhashtable. Each of
> them will:
> 
> 1) insert it's own set of objects,
> 2) lookup every successfully inserted object and finally
> 3) remove objects in several rounds until all of them have been removed,
>    making sure the remaining ones are still found after each round.
> 
> This should put a good amount of load onto the system and due to
> synchronising thread startup via two semaphores also extensive
> concurrent table access.
> 
> The default number of ten threads returned within half a second on my
> local VM with two cores. Running 200 threads took about four seconds. If
> slow systems suffer too much from this though, the default could be
> lowered or even set to zero so this extended test does not run at all by
> default.
> 
> Signed-off-by: Phil Sutter <phil@....cc>

Looks great. A default of 10 makes sense as well. Thanks a lot!

Acked-by: Thomas Graf <tgraf@...g.ch>
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