[#DERBY-1704] Allow more concurrency in the lock manager

Derby

Allow more concurrency in the lock manager

Created: 16/Aug/06 12:29 PM Updated: 29/Jun/09 02:31 PM

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Component/s:

Services

Affects Version/s:

10.2.1.6

Fix Version/s:

10.3.1.4

Time Tracking:

Issue & Sub-Tasks

Issue Only

Not Specified

File Attachments:

File Name	Date Attached	Attached By	Size
cleanup1.diff	2007-01-19 01:35 PM	Knut Anders Hatlen	7 kB
cleanup1.stat	2007-01-19 01:35 PM	Knut Anders Hatlen	0.3 kB
cleanup1.v2.diff	2007-01-22 02:02 PM	Knut Anders Hatlen	8 kB
cleanup2.diff	2007-01-24 08:53 AM	Knut Anders Hatlen	2 kB
cleanup3.diff	2007-02-13 08:03 AM	Knut Anders Hatlen	6 kB
cleanup3.stat	2007-02-13 08:03 AM	Knut Anders Hatlen	0.2 kB
cleanup4.diff	2007-03-12 08:32 AM	Knut Anders Hatlen	0.6 kB
cleanup5.diff	2007-03-13 01:38 PM	Knut Anders Hatlen	5 kB
cleanup5.stat	2007-03-13 01:38 PM	Knut Anders Hatlen	0.2 kB
cleanup6.diff	2007-03-13 03:29 PM	Knut Anders Hatlen	2 kB
split-hashtables.diff	2006-08-16 12:36 PM	Knut Anders Hatlen	12 kB
split-hashtables.stat	2006-08-16 12:36 PM	Knut Anders Hatlen	0.3 kB

Image Attachments:

1. 1cpu.png
(3 kB)

2. 2cpu.png
(4 kB)

3. 8cpu.png
(3 kB)

Urgency:	Normal
Bug behavior facts:	Performance
Resolution Date:	25/May/07 06:58 AM

Sub-Tasks:

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Description

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I have seen indications of severe monitor contention in SinglePool
(the current lock manager) when multiple threads access a Derby
database concurrently. When a thread wants to lock an object, it needs
to obtain the monitor for both SinglePool and LockSet (both of them
are global synchronization points). This leads to poor scalability.

We should investigate how to allow more concurrency in the lock
manager, and either extend SinglePool or implement a new manager.

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Change History

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Knut Anders Hatlen made changes - 16/Aug/06 12:32 PM

Field	Original Value	New Value
Attachment		2cpu.png [ 12338952 ]
Attachment		8cpu.png [ 12338953 ]
Attachment		1cpu.png [ 12338951 ]

Knut Anders Hatlen made changes - 16/Aug/06 12:36 PM

Attachment		split-hashtables.diff [ 12338954 ]
Attachment		split-hashtables.stat [ 12338955 ]

Knut Anders Hatlen made changes - 13/Nov/06 09:29 AM

Assignee

Knut Anders Hatlen [ knutanders ]

Knut Anders Hatlen made changes - 13/Nov/06 10:57 AM

Status

Open [ 1 ]

In Progress [ 3 ]

Knut Anders Hatlen made changes - 19/Jan/07 01:35 PM

Attachment		cleanup1.diff [ 12349257 ]
Attachment		cleanup1.stat [ 12349258 ]

Knut Anders Hatlen made changes - 19/Jan/07 02:09 PM

Derby Info

[Patch Available]

Knut Anders Hatlen made changes - 22/Jan/07 02:02 PM

Attachment

cleanup1.v2.diff [ 12349376 ]

Knut Anders Hatlen made changes - 23/Jan/07 12:11 PM

Derby Info

[Patch Available]

Knut Anders Hatlen made changes - 24/Jan/07 08:53 AM

Attachment

cleanup2.diff [ 12349498 ]

Knut Anders Hatlen made changes - 13/Feb/07 08:03 AM

Attachment		cleanup3.diff [ 12351011 ]
Attachment		cleanup3.stat [ 12351012 ]

Knut Anders Hatlen made changes - 13/Feb/07 08:05 AM

Derby Info

[Patch Available]

Knut Anders Hatlen made changes - 14/Feb/07 07:41 AM

Derby Info

[Patch Available]

Knut Anders Hatlen made changes - 12/Mar/07 08:32 AM

Attachment

cleanup4.diff [ 12353090 ]

Knut Anders Hatlen made changes - 13/Mar/07 01:38 PM

Attachment		cleanup5.stat [ 12353193 ]
Attachment		cleanup5.diff [ 12353192 ]

Knut Anders Hatlen made changes - 13/Mar/07 03:29 PM

Attachment

cleanup6.diff [ 12353201 ]

Knut Anders Hatlen made changes - 25/May/07 06:58 AM

Status	In Progress [ 3 ]	Closed [ 6 ]
Fix Version/s		10.3.0.0 [ 12310800 ]
Resolution		Fixed [ 1 ]

Dag H. Wanvik made changes - 29/Jun/09 01:47 PM

Component/s

Performance [ 11709 ]

Dag H. Wanvik made changes - 29/Jun/09 02:31 PM

Derby Categories

[Performance]