what is the difference between a course grain lock

by Andreanne Mohr I Published 2 years ago Updated 1 year ago 7 min read

Usually, the difference between fine-grained and coarse-grained locking is not the "size" of your lock sections (the amount of code you cover with a lock), it refers to the lock granularity in relation to the data structure itself. So, one approach is to have a single lock for the whole tree - coarse-grained locking.

Coarse-grained locking has low overhead but low concurrency. Fine-grained locking has high concurrency but high overhead. One compromise is to lock at the file and page granularity. This gives a moderate degree of concurrency with a moderate amount of locking overhead.

Full Answer

What is the difference between coarse-grained and fine grained systems?

Despite some differences between them all fine-grained access control solutions have a number of similarities. First, they all permit multiple criteria, such as department, job code, time of day, …

What is the difference between coarse-grained and granular access control?

May 02, 2020 · Usually, the difference between fine-grained and coarse-grained locking is not the "size" of your lock sections (the amount of code you cover with a lock), it refers to the lock …

What are the different types of locking?

Topics discussed • Coarse-grained locking – One lock • Fine-grained locking – More than one lock Art of Multiprocessor Programming 2

What is the difference between fine and coarse threaded bolts?

What is the difference between fine grained and coarse grain? Coarse-grained systems consist of fewer, larger components than fine-grained systems; a coarse-grained description of a system …

What is the difference between coarse-grained and fine grained?

Coarse-grained systems consist of fewer, larger components than fine-grained systems; a coarse-grained description of a system regards large subcomponents while a fine-grained description regards smaller components of which the larger ones are composed.

What is coarse grain locking?

A Coarse-Grained Lock is a single lock that covers many objects. It not only simplifies the locking action itself but also frees you from having to load all the members of a group in order to lock them.

What are fine grained locks?

In a fine-grained locking system, processes aim to hold minimal sets of locks. In our example, P1/P2's lock covers just the buffer, not the network, so P3 could access the network in parallel with P1/P2 accessing the buffer. There are two disadvantages.

What is coarse-grained interface?

Using coarse-grained interfaces, a system of services controls access to the objects referenced by each service. While each service may be implemented as an abstraction on a group of finer-grained objects, the objects themselves can be hidden from public access.Aug 29, 2003

What are fine-grained and coarse-grained locks?

Coarse-grained locking has low overhead but low concurrency. Fine-grained locking has high concurrency but high overhead. One compromise is to lock at the file and page granularity. This gives a moderate degree of concurrency with a moderate amount of locking overhead.

What is coarse granularity in DBMS?

Granularity – It is the size of the data item allowed to lock. Now Multiple Granularity means hierarchically breaking up the database into blocks that can be locked and can be tracked needs what needs to lock and in what fashion. Such a hierarchy can be represented graphically as a tree.Jun 2, 2021

How is fine grained locking implemented?

For fine grained locking, use an array of read/write locks (as Carey Hickling suggests). Hash the index value and filter it through a bit mask (or use modulus) to select which lock to use. This effectively splits the indexes into N buckets, where N is the number of locks you create.Jan 26, 2012

What is hand over hand locking?

Hand-over-hand locking ¹ is a fine-grained synchronization technique that prevent data races among concurrent operations. Commonly applied to pointer-based data structures, operations lock nodes as they traverse the data structure.Aug 1, 2018

What is the difference between fine grained and coarse grain parallelism in comparison of data parallelism?

Connection Machine (CM-2) and J-Machine are examples of fine-grain parallel computers that have grain size in the range of 4-5 μs. In coarse-grained parallelism, a program is split into large tasks. Due to this, a large amount of computation takes place in processors.

What does finer grains mean?

1 : producing images of low graininess so that considerable enlargement without undue coarseness is permitted —used of a photographic developer. 2 or less commonly fine-grained \ ˈ⸗¦⸗ \ : characterized by comparatively fine graininess —used of a photographic image or photographic emulsion.

What is coarse grained authorization?

coarse grained authorization. As discussed in previous post about authorization, it's the process by which the access or entitlement of the requester for the requested resource is decided or assured.Oct 19, 2013

Coarse-Grained vs. Fine-Grained Authorization

One of the factors that distinguishes IAM solutions from each other is their granularity, or the amount of specificity each supports in Authorization decisions. For example, a solution that bases decisions solely on users’ organizational positions (e.

Early Approaches to Fine-Grained Authorization

The first Authorization solutions were actually quite fine-grained, although that phrase did not exist at the time. The oldest approach to Authorization, Access Control Lists (ACLs) set access to resources per user (e.g., “Janet can access these applications; Steve can access those”) rather than by user type.

Better Types of Authorization

In response to these needs and others, fine-grained Authorization emerged, namely Attribute-Based Access Control (ABAC) and Policy-Based Access Control (PBAC).

PBAC: The Best of the Fine-Grained Solutions

Of the fine-grained Authorization solutions, PBAC offers the clearest advantages. In addition to supporting a wide variety of flexible Authorization policies, Policy-Based Access Control:

What is the difference between coarse and fine threaded bolts?

What is the difference between fine and coarse threaded bolts? Bolts with coarse threads have a larger pitch (fewer threads per axial distance) compared to fine threads. A coarse threaded bolt is specified for most applications unless there is an overriding reason to use a fine threaded bolt (e.g.

What is coarse threaded bolt?

A coarse threaded bolt is specified for most applications unless there is an overriding reason to use a fine threaded bolt (e.g. thorough thread adjustment is crucial for the application). Furthermore, fine thread fasteners are more difficult to obtain.

Is fine thread stronger than coarse thread?

The potential benefits of fine threads are: Size for size, a fine thread is stronger than a coarse thread. This is both in tension (because of the larger stress area) and shear (because of their larger minor diameter). Because of the smaller pitch, they allow finer adjustments in applications that need such a feature.

Why are fine threads used?

Because of the smaller pitch, they allow finer adjustments in applications that need such a feature. Fine threads can be more easily tapped into hard materials and thin-walled tubes. Fine threads require less torque to develop equivalent bolt preloads.