CN102629218A - Reconfigurable hardware task fit method based on length to width ratios of tasks - Google Patents

Abstract

The invention provides a reconfigurable hardware task fit method based on length to width ratios of tasks. A two-dimensional coordinate system formed by an X-axis and a Y-axis is constructed on the basis of a two-dimensional reconfigurable resource model; the task layout direction is determined according to the length to width ratios of the tasks to be placed; when the width is larger than or equal to the height, the tasks are laid out in an X-axis direction; when the width is smaller than the height, the tasks are laid out in a Y-axis direction; an upper boundary and a right boundary produced after the tasks are fit are recognized and recorded in a task boundary set Bset; when boundary values produced after the tasks are fit are equal to a boundary value of a reconfigurable device, the boundary values are not recorded in the boundary set Bset; the same boundary value produced due to the overlapping of task boundaries is repeatedly recorded; and after being executed, the tasks sequentially quit according to the finish time, and boundary values corresponding to the tasks are deleted from the task boundary set Bset. When applied to task sets of reconfigurable hardware tasks with relatively large length to width ratios, the reconfigurable hardware task fit method has the advantages that the task conflict probability can be reduced and the task scheduling success rate can be increased.

Description

A kind of reconfigurable hardware task laying method based on the task length breadth ratio

Technical field

The invention belongs to field of computer technology, be specifically related to a kind of reconfigurable hardware task laying method based on the task length breadth ratio.

Background technology

In restructurable computing system; The restructural resource is abstract usually to be two kinds of models of peacekeeping two dimension; In two-dimentional restructural resource model, computational resource is divided with the mode of two-dimensional array and is organized, and the least unit of reconstruct is a rectangular element in the two-dimensional array; A reconfigurable hardware task takies a rectangular area in the array; A plurality of tasks are carried out layout through the mode of scheduling in reconfigurable hardware, because the placement of each task in resource space has two-dimensional freedom, therefore normal employing clear area scanning and these two kinds of methods of state matrix record are that task to be scheduled is searched suitable placement position.The clear area scan method mainly is to come resource is described through the record clear area; Wherein the most important thing is maximum idle rectangle method MER (Maximal Empty Rectangle); The idling-resource rectangle tabulation that one of MER method record does not overlap mutually; Obtain to wait to dispatch the placement location of hardware task through the idling-resource rectangle of searching coupling, this method need safeguard the tabulation of resource rectangle, and it is higher relatively to search the complexity of coupling idling-resource during task scheduling; The state matrix recording method comes management resource through the matrix of safeguarding record restructural computing unit (Reconfigurable Computing Unit) state; But and search the placement location of waiting to dispatch hardware task through the scanning mode matrix; The method need scan and search state matrix, and spended time is longer relatively.What the placement strategy that when the task layout, adopts was commonly used has two kinds; A kind of is first fit laying method (First Fit); Another kind is best laying method (Best Fit); These two kinds of laying methods are not all considered the scale information of two-dimensional device model and hardware task, and therefore under the situation that load factor is higher and the hardware task scale is consistent relatively, the task scheduling success ratio is not high.

Summary of the invention

In order to overcome the problem that exists in the above-mentioned prior art; The object of the present invention is to provide a kind of reconfigurable hardware task laying method based on the task length breadth ratio; On the basis of two-dimentional restructural resource model, utilize the scale information of two-dimensional device model, through the information of introducing reconfigurable hardware task length breadth ratio the reconfigurable hardware task is carried out layout again; Cause the probability of conflict with competitive resource between the reduction task, improve the task scheduling success ratio.

In order to achieve the above object, the technical scheme that the present invention adopted is:

A kind of reconfigurable hardware task laying method based on the task length breadth ratio may further comprise the steps:

The first step is on the two-dimentional restructural resource model basis of W * H in scale, makes up the two-dimensional coordinate system of X, Y axle composition, and the least unit of X, Y axle is a restructural computing unit, based on the reconfigurable hardware task T of two-dimensional coordinate system _iRequired reconstruct resource identifies with rectangle, and rectangle size is described as: T _i=(w _i, h _i), wherein i is a positive integer, w _iBe task T _iTake the width of resource, h _iBe task T _iTake the height of resource; Task T _iTo occupy high h of being in the two-dimensional coordinate system _i, wide is w _iThe rectangular area, be called the task put area, first task T ₁Put area lower left corner coordinate be (0,0), task T then ₁Placement location can be expressed as: [(0,0), (w ₁, h ₁)];

Second step, during reconfigurable hardware task layout, according to the length breadth ratio of waiting the task of the placing layout direction that sets the tasks, shown in (1):

$\mathrm{decisionV}(w_i,h_i)=\left\{\begin{array}{cc}1,& w_i\≥h_i\\ 0,& \mathrm{Other}\end{array}\right.---\left(1\right)$

W wherein _i, h _iWide and high for reconfigurable hardware task to be placed,

As the wide w that waits the task of placing _iMore than or equal to its high h _iThe time, task will be along the X-direction layout; As the wide w that waits the task of placing _iLess than its high h _iThe time, task will be along the Y direction layout;

The 3rd step; To the successful task of layout in the reconfigurable device; This method identification mission is placed coboundary and the right margin that the back produces; And it is recorded among the task boundary set Bset, place the boundary value of boundary value that the back produces and reconfigurable device when identical when task, will refuse record among the task boundary set Bset; For the same edge dividing value of the overlapping generation in task border, adopt the mode of duplicate record to be recorded among the Bset, delete corresponding border record when making things convenient for task termination to withdraw from;

In the 4th step, after the reconfigurable hardware task is complete, task will withdraw from according to the concluding time successively, simultaneously the corresponding boundary value of this task of deletion from task boundary set Bset.

Salient point of the present invention is:

To the relatively large situation of reconfigurable hardware task length breadth ratio; Utilize the scale information of two-dimentional restructural resource model; Decide the task placement direction through placing the task length breadth ratio; Reduced the probability that the reconfigurable hardware task clashes when layout, thereby improved the success ratio of task scheduling, in the reconfigurable system applicable to real time execution.

Description of drawings

Fig. 1 is a two-dimensional coordinate system synoptic diagram of the present invention, and unit horizontal, ordinate is the reconfigurable cell number.

Fig. 2 is a reconfigurable hardware task layout example schematic of the present invention.

Embodiment

Below in conjunction with accompanying drawing and instance the present invention is done detailed description.

A kind of reconfigurable hardware task laying method based on the task length breadth ratio may further comprise the steps:

The first step is on the two-dimentional restructural resource model basis of W * H in scale, makes up the two-dimensional coordinate system of X, Y axle composition, and the least unit of X, Y axle is a restructural computing unit, based on the reconfigurable hardware task T of two-dimensional coordinate system _iRequired reconstruct resource identifies with rectangle, and rectangle size is described as: T _i=(w _i, h _i), wherein i is a positive integer, w _iBe task T _iTake the width of resource, h _iBe task T _iTake the height of resource; Task T _iTo occupy high h of being in the two-dimensional coordinate system _i, wide is w _iThe rectangular area, be called the task put area, first task T ₁Put area lower left corner coordinate be (0,0), task T then ₁Placement location can be expressed as: [(0,0), (w ₁, h ₁)].

With reference to Fig. 1, A is that scale is the two-dimentional restructural resource model of W * H, and wherein wide W=10, high H=10, B are that restructural calculates minimum unit.

Second step, during reconfigurable hardware task layout, according to the length breadth ratio of waiting the task of the placing layout direction that sets the tasks, shown in (1):

$\mathrm{decisionV}(w_i,h_i)=\left\{\begin{array}{cc}1,& w_i\≥h_i\\ 0,& \mathrm{Other}\end{array}\right.---\left(1\right)$

W wherein _i, h _iWide and high for reconfigurable hardware task to be placed

As the wide w that waits the task of placing _iMore than or equal to its high h _iThe time, task will be along the X-direction layout; As the wide w that waits the task of placing _iLess than its high h _iThe time, task will be along the Y direction layout.

With reference to Fig. 2, task T ₁Placement location is [(0,0) (3,7)], task T ₂After the arrival, according to the length breadth ratio of the task of placement, i.e. w _i=7＞h _i==3, T sets the tasks ₂Place along directions X, placement location is [(3,0) (10,3)]; Task T ₃After the arrival, same length breadth ratio, i.e. w according to the task of placement _i=6＞h _i=3, T sets the tasks ₃Place along X-direction, according to boundary value (X-0,3 of task boundary set Bset record; Y-0,3,7), task T wherein ₂The border of placing the X-direction of back generation equals device boundaries, therefore refuses record, task T ₃The initial boundary value that can place along X-direction is 3, and the initial boundary value that can place along Y direction is 3, then task T ₃Placement location be [(3,3) (9,6)]; Task T ₃Arrive the back if adopt best laying method Best Fit placement strategy or First Fit placement strategy etc., work as T ₄Then can cause conflict after the arrival, i.e. task T ₄Can't place, place task T and adopt based on the laying method of task length breadth ratio ₃, task T then ₄Can successfully place, according to the length breadth ratio of the placing task layout direction that sets the tasks, w _i=8＞h _i==3, task T ₄Place along X-direction, according to boundary value (X-0,3,9 of task boundary set Bset record; Y-0,3,6,7), the initial boundary value that can place along X-direction is 0, the initial boundary value that can place along Y direction is 7, then task T ₄Placement location be [(0,7) (8,10)].

In the 3rd step, to the successful task of layout in the reconfigurable device, this method identification mission is placed coboundary and the right margin that the back produces, and it is recorded among the task boundary set Bset.When the boundary value that after task is placed, produces is identical with the boundary value of reconfigurable device, will refuse record among the task boundary set Bset; For the same edge dividing value of the overlapping generation in task border, adopt the mode of duplicate record to be recorded among the Bset, delete corresponding border record when making things convenient for task termination to withdraw from.

With reference to Fig. 2, task T ₄After the placement, updating task boundary set Bset is recorded as: (X-0,3,8,9; Y-0,3,6,7), task T ₄The border of placing the Y direction of back generation equals the reconfigurable device border, therefore refuses record.

In the 4th step, after the reconfigurable hardware task was complete, task withdrawed from according to the concluding time successively, simultaneously the corresponding boundary value of this task of deletion from task boundary set Bset.

With reference to Fig. 2, task T ₁Withdraw from task T among the deletion task boundary set Bset after complete ₁Corresponding border record: (X-3; Y-7), updating task boundary set Bset is recorded as: (X-0,8,9; Y-0,3,6), carry out end according to task successively and withdraw from proper order, and updating task boundary set Bset.

Claims (1)

1. reconfigurable hardware task laying method based on the task length breadth ratio is characterized in that step is following:

The first step is on the two-dimentional restructural resource model basis of W * H in scale, makes up the two-dimensional coordinate system of X, Y axle composition, and the least unit of X, Y axle is a restructural computing unit, based on the reconfigurable hardware task T of two-dimensional coordinate system _iRequired reconstruct resource identifies with rectangle, and rectangle size is described as: T _i=(w _i, h _i), wherein i is a positive integer, w _iBe task T _iTake the width of resource, h _iBe task T _iTake the height of resource; Task T _iTo occupy high h of being in the two-dimensional coordinate system _i, wide is w _iThe rectangular area, be called the task put area, first task T ₁Put area lower left corner coordinate be (0,0), task T then ₁Placement location can be expressed as: [(0,0), (w ₁, h ₁)];

Second step, during reconfigurable hardware task layout, according to the length breadth ratio of waiting the task of the placing layout direction that sets the tasks, shown in (1):

$\mathrm{decisionV}(w_i,h_i)=\left\{\begin{array}{cc}1,& w_i\≥h_i\\ 0,& \mathrm{Other}\end{array}\right.---\left(1\right)$

W wherein _i, h _iWide and high for reconfigurable hardware task to be placed,

As the wide w that waits the task of placing _iMore than or equal to its high h _iThe time, task will be along the X-direction layout; As the wide w that waits the task of placing _iLess than its high h _iThe time, task will be along the Y direction layout;

The 3rd step; To the successful task of layout in the reconfigurable device; This method identification mission is placed coboundary and the right margin that the back produces; And it is recorded among the task boundary set Bset, place the boundary value of boundary value that the back produces and reconfigurable device when identical when task, will refuse record among the task boundary set Bset; For the same edge dividing value of the overlapping generation in task border, adopt the mode of duplicate record to be recorded among the Bset, delete corresponding border record when making things convenient for task termination to withdraw from;

In the 4th step, after the reconfigurable hardware task is complete, task will withdraw from according to the concluding time successively, simultaneously the corresponding boundary value of this task of deletion from task boundary set Bset.

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