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From: Vladimir Davydov <vdavydov.dev@gmail.com>
To: kostja@tarantool.org
Cc: tarantool-patches@freelists.org
Subject: Re: [PATCH 7/7] vinyl: keep track of disk idle time
Date: Tue, 4 Sep 2018 14:54:04 +0300	[thread overview]
Message-ID: <20180904115404.el6kdswgitsnopgf@esperanza> (raw)
In-Reply-To: <d0477df76ff786366c11c7f4030824f98aa90bb8.1535917763.git.vdavydov.dev@gmail.com>

Please ignore this patch, because it's incorrect: since we always
keep one worker reserved for dumps it will should that the disk is
1/box.cfg.vinyl_writers idle even if compaction never stops, which
is misleading. I'll rework and resend it separately.

On Sun, Sep 02, 2018 at 11:19:00PM +0300, Vladimir Davydov wrote:
> To understand whether the disk is fully utilized or can still handle
> more compaction load and make right decisions regarding transaction
> throttling, we need a metric that would report how much time worker
> threads spent being idle. So this patch adds a new metric to global
> statistics, box.stat.vinyl().disk.idle_ratio. The metric is updated
> on each dump using the following formula:
> 
>                        idle_time
>   idle_ratio = --------------------------
>                dump_period * worker_count
> 
> where idle_time is the total amount of time workers were idle between
> the last two dumps, dump_period is the time that passed between the last
> two dumps, worker_count is the number of workers.
> 
> The value of the new metric always lays between 0 inclusive and 1
> exclusive. The closer it is to 1 the more busy the disk is.
> ---
>  src/box/vinyl.c            |  1 +
>  src/box/vy_scheduler.c     | 48 +++++++++++++++++++++++++++++++----
>  src/box/vy_scheduler.h     | 12 +++++++++
>  test/vinyl/errinj.result   | 62 ++++++++++++++++++++++++++++++++++++++++++++++
>  test/vinyl/errinj.test.lua | 22 ++++++++++++++++
>  test/vinyl/info.result     |  1 +
>  test/vinyl/info.test.lua   |  1 +
>  7 files changed, 142 insertions(+), 5 deletions(-)

  reply	other threads:[~2018-09-04 11:54 UTC|newest]

Thread overview: 39+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-09-02 20:18 [PATCH 0/7] vinyl: improve stats for throttling Vladimir Davydov
2018-09-02 20:18 ` [PATCH 1/7] vinyl: fix accounting of secondary index cache statements Vladimir Davydov
2018-09-02 22:26   ` [tarantool-patches] " Konstantin Osipov
2018-09-02 20:18 ` [PATCH 2/7] vinyl: add global memory stats Vladimir Davydov
2018-09-02 22:27   ` [tarantool-patches] " Konstantin Osipov
2018-09-02 22:27   ` Konstantin Osipov
2018-09-03  8:10     ` Vladimir Davydov
2018-09-02 20:18 ` [PATCH 3/7] vinyl: add global disk stats Vladimir Davydov
2018-09-02 22:30   ` [tarantool-patches] " Konstantin Osipov
2018-09-02 20:18 ` [PATCH 4/7] vinyl: fix force compaction logic Vladimir Davydov
2018-09-02 20:18 ` [PATCH 5/7] vinyl: update compact priority usual way on range split/coalesce Vladimir Davydov
2018-09-02 20:18 ` [PATCH 6/7] vinyl: keep track of compaction queue length and debt Vladimir Davydov
2018-09-02 20:19 ` [PATCH 7/7] vinyl: keep track of disk idle time Vladimir Davydov
2018-09-04 11:54   ` Vladimir Davydov [this message]
2018-09-04 17:23     ` Vladimir Davydov
2018-09-04 17:23       ` [PATCH 1/8] vinyl: add helper to check whether dump is in progress Vladimir Davydov
2018-09-06  7:33         ` Konstantin Osipov
2018-09-04 17:23       ` [PATCH 2/8] vinyl: don't use mempool for allocating background tasks Vladimir Davydov
2018-09-06  7:33         ` Konstantin Osipov
2018-09-04 17:23       ` [PATCH 3/8] vinyl: factor out worker pool from scheduler struct Vladimir Davydov
2018-09-06  7:34         ` Konstantin Osipov
2018-09-04 17:23       ` [PATCH 4/8] vinyl: move worker allocation closer to task creation Vladimir Davydov
2018-09-06  7:35         ` Konstantin Osipov
2018-09-04 17:23       ` [PATCH 5/8] vinyl: use separate thread pools for dump and compaction tasks Vladimir Davydov
2018-09-06  7:37         ` Konstantin Osipov
2018-09-06  9:48           ` Vladimir Davydov
2018-09-06 10:32             ` Konstantin Osipov
2018-09-04 17:23       ` [PATCH 6/8] vinyl: zap vy_worker_pool::idle_worker_count Vladimir Davydov
2018-09-06  7:38         ` Konstantin Osipov
2018-09-04 17:23       ` [PATCH 7/8] vinyl: don't start scheduler fiber until local recovery is complete Vladimir Davydov
2018-09-06  7:39         ` Konstantin Osipov
2018-09-04 17:23       ` [PATCH 8/8] vinyl: keep track of thread pool idle ratio Vladimir Davydov
2018-09-06  7:49         ` Konstantin Osipov
2018-09-06  8:18           ` Vladimir Davydov
2018-09-06 10:26             ` Konstantin Osipov
2018-09-06 10:52               ` Vladimir Davydov
2018-09-06 10:57                 ` Konstantin Osipov
2018-09-06 11:59                   ` Vladimir Davydov
2018-09-09 11:41 ` [PATCH 0/7] vinyl: improve stats for throttling Vladimir Davydov

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