CN108829514B - Memory allocation method and platform - Google Patents
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- CN108829514B CN108829514B CN201810522640.7A CN201810522640A CN108829514B CN 108829514 B CN108829514 B CN 108829514B CN 201810522640 A CN201810522640 A CN 201810522640A CN 108829514 B CN108829514 B CN 108829514B
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- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F9/00—Arrangements for program control, e.g. control units
- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
- G06F9/46—Multiprogramming arrangements
- G06F9/50—Allocation of resources, e.g. of the central processing unit [CPU]
- G06F9/5005—Allocation of resources, e.g. of the central processing unit [CPU] to service a request
- G06F9/5011—Allocation of resources, e.g. of the central processing unit [CPU] to service a request the resources being hardware resources other than CPUs, Servers and Terminals
- G06F9/5016—Allocation of resources, e.g. of the central processing unit [CPU] to service a request the resources being hardware resources other than CPUs, Servers and Terminals the resource being the memory
Abstract
The invention discloses a memory allocation method and a platform, the method generates the remaining memory amount of a system according to the first memory allocation amount of a first process generated in advance, if the remaining memory amount of the system is judged to be less than or equal to the memory allocation amount of a second process, generates the second memory allocation amount of the first process according to the historical maximum memory usage amount and the historical minimum remaining memory amount of the system corresponding to the first process, and allocates memory for the first process according to the second memory allocation amount. The method and the device can improve the running smoothness of the process on one hand and can avoid the waste of the memory on the other hand.
Description
Technical Field
The present invention relates to the field of computer technologies, and in particular, to a memory allocation method and a platform.
Background
When a new process accesses the database, memory needs to be allocated to the new process. The existing memory allocation method cannot predict the size of the memory required by the process, and the memory is allocated to the process according to the preset memory value. If the preset memory value is too small, the process cannot smoothly run; if the preset memory value is too large, the memory will be wasted.
Disclosure of Invention
The invention aims to at least solve one of the technical problems in the prior art, and provides a memory allocation method and a memory allocation platform, which can improve the running smoothness of a process on one hand and avoid the waste of memory on the other hand.
To achieve the above object, the present invention provides a memory allocation method, including:
generating the residual memory amount of the system according to the pre-generated first memory allocation amount of the first process;
judging whether the residual memory amount of the system is less than or equal to the memory allocation amount of a second process;
if the residual memory amount of the system is judged to be less than or equal to the memory allocation amount of the second process, generating the second memory allocation amount of the first process according to the historical maximum memory usage amount corresponding to the first process and the historical minimum residual memory amount of the system;
and allocating the memory for the first process according to the second memory allocation amount.
Optionally, before the generating the remaining memory amount of the system according to the pre-generated first memory allocation amount of the first process, the method further includes:
receiving a connection request of a first process;
acquiring a pre-stored historical maximum memory usage amount corresponding to the first process and a system historical minimum remaining memory amount;
generating a first memory allocation amount of a first process according to a historical maximum memory usage amount corresponding to the first process and a system historical minimum remaining memory amount;
and allocating the memory for the first process according to the first memory allocation amount of the first process.
Optionally, before the allocating the memory to the first process according to the second memory allocation amount, the method further includes:
receiving a connection request of a first process;
and acquiring a second pre-stored memory allocation amount of the first process.
Optionally, the method further comprises:
and if the residual memory amount of the system is judged to be less than or equal to the memory allocation amount of the second process, allocating memory for the second process according to a preset memory value of the system.
Optionally, the generating a first memory allocation amount of the first process according to the historical maximum memory usage amount and the system historical minimum remaining memory amount corresponding to the first process specifically includes:
by the formula M3 Min (M)1,M20.618) generating a first memory allocation amount of the first process, wherein M1 represents a historical maximum memory usage amount corresponding to the first process, M2 represents a system historical minimum remaining memory amount corresponding to the first process, and M3 represents the first memory allocation amount of the first process.
Optionally, the generating a second memory allocation amount of the first process according to the historical maximum memory usage amount and the system historical minimum remaining memory amount corresponding to the first process specifically includes:
by the formula M4 Min (M)1,M2*0.6182) Generating a second memory allocation amount for the first process, wherein M1 represents a historical maximum memory usage amount corresponding to the first process, and M2 represents a historical maximum memory usage amount corresponding to the first processThe minimum remaining memory amount of the system history corresponding to the first process, and M4 represents the second memory allocation amount of the first process.
To achieve the above object, the present invention further provides a memory allocation platform, including: the device comprises a generation module, a judgment module and a distribution module;
the generating module is configured to generate a remaining memory amount of the system according to a first memory allocation amount of a first process generated in advance, and if the determining module determines that the remaining memory amount of the system is less than or equal to a memory allocation amount of a second process, generate a second memory allocation amount of the first process according to a historical maximum memory usage amount corresponding to the first process and a historical minimum remaining memory amount of the system;
the judging module is configured to judge whether the remaining memory amount of the system is less than or equal to a memory allocation amount of a second process;
and the allocation module is used for allocating the memory to the first process according to the second memory allocation amount.
Optionally, the method further comprises: the device comprises a receiving module and an obtaining module;
the receiving module is used for receiving a connection request of a first process;
the obtaining module is configured to obtain a pre-stored historical maximum memory usage amount and a system historical minimum remaining memory amount corresponding to the first process;
the generating module is further configured to generate a first memory allocation amount of the first process according to a historical maximum memory usage amount corresponding to the first process and a system historical minimum remaining memory amount;
the allocation module is further configured to allocate the memory for the first process according to the first memory allocation amount of the first process.
Optionally, the obtaining module is further configured to obtain a second pre-stored memory allocation amount of the first process.
Optionally, the allocating module is further configured to allocate the memory to the second process according to a preset memory value of the system if the determining module determines that the remaining memory amount of the system is less than or equal to the memory allocation amount of the second process.
The invention has the following beneficial effects:
the memory allocation method provided by the invention comprises the steps of generating the remaining memory amount of a system according to a pre-generated first memory allocation amount of a first process, if the remaining memory amount of the system is judged to be smaller than or equal to the memory allocation amount of a second process, generating a second memory allocation amount of the first process according to the historical maximum memory usage amount and the historical minimum remaining memory amount corresponding to the first process, and allocating memory for the first process according to the second memory allocation amount. The method and the device can improve the running smoothness of the process on one hand and can avoid the waste of the memory on the other hand.
Drawings
Fig. 1 is a schematic flowchart illustrating a memory allocation method according to an embodiment of the present invention;
fig. 2 is a schematic flowchart of a memory allocation method according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of a memory allocation platform according to a third embodiment of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the following clear and complete description of the technical solution of the present invention is made with reference to the accompanying drawings, and it is obvious that the described embodiments are a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Example one
Fig. 1 is a schematic flowchart of a memory allocation method according to an embodiment of the present invention, where as shown in fig. 1, the memory allocation method includes:
And step 104, allocating the memory to the first process according to the second memory allocation amount, and ending the process.
In the memory allocation method provided in this embodiment, a remaining memory amount of a system is generated according to a first memory allocation amount of a first process generated in advance, if it is determined that the remaining memory amount of the system is less than or equal to a memory allocation amount of a second process, a second memory allocation amount of the first process is generated according to a historical maximum memory usage amount corresponding to the first process and a historical minimum remaining memory amount of the system, and a memory is allocated to the first process according to the second memory allocation amount. The method can improve the running smoothness of the process on one hand, and can also avoid the waste of the memory on the other hand.
Example two
Fig. 2 is a schematic flow chart of a memory allocation method according to a second embodiment of the present invention, and as shown in fig. 2, the memory allocation method includes:
Preferably, the steps of this embodiment are executed by the memory allocation platform.
The system described in this embodiment may be understood as a database. This embodiment will be described by taking an oracle database (oracle database) as an example. The memory allocated by the oracle database for the process comprises two types: each process can share a used SGA (System Global Area) and a PGA (Program Global Area) for only one process, and the memory allocation method of the present embodiment allocates only PGAs. Further, the processes involved in the memory allocation method of this embodiment are periodically running processes, such as: and a process of updating the user information table data in the morning and a process of updating the user marketing data in the early monthly.
The connection request of the first process indicates that the first process requests to connect to the system.
The historical maximum memory usage M1 corresponding to the first process is the historical maximum memory usage when the first process is running, and the system historical minimum remaining memory amount M2 corresponding to the first process is the system historical minimum remaining memory amount generated when the first process accesses the system.
Preferably, the pre-stored maximum memory usage amount when the first process runs the last ten times and the system minimum remaining memory amount when the first process runs the last ten times are obtained. The minimum remaining memory amount of the system is the minimum available memory amount of the system.
Specifically, by the formula M3 ═ Min (M)1,M20.618) generating a first memory allocation amount of the first process, wherein M1 represents a historical maximum memory usage amount corresponding to the first process, M2 represents a system historical minimum remaining memory amount corresponding to the first process, and M3 represents the first memory allocation amount of the first process.
In this embodiment, M1 and M2 are dynamic variables, the real-time values of M1 and M2 are recorded in the data dictionaries v $ sesstat and v $ process, and the system reads the data dictionaries once every second to record the real-time values of M1 and M2.
The memory size of the first process accessing the system at this time is the size of the first memory allocation amount.
Such as: note that the remaining memory amount of the system before the first process accesses the system is n1, the remaining memory amount of the system n2 generated in this step 205 is n 1-M3.
The second process is a process which requests to access the system when the first process runs.
The order of execution of steps 205 and 206 may be changed as desired, for example, step 206 may be executed before step 205 or steps 205 and 206 may be executed simultaneously.
The memory allocation amount of the second process may be a first memory allocation amount of the second process, wherein a generation manner of the first memory allocation amount of the second process is the same as a generation manner of the first memory allocation amount of the first process, which may be specifically described in step 203.
If the remaining memory amount of the system is determined to be less than or equal to the memory allocation amount of the second process, which indicates that the memory allocated for the first process is too large, the subsequent second process cannot normally access the system, and step 208 is executed. If the remaining memory amount of the system is judged to be larger than the memory allocation amount of the second process, the memory allocated for the first process is appropriate, and the subsequent second process can be normally accessed into the system.
Specifically, by the formula M4 ═ Min (M)1,M2*0.6182) And generating a second memory allocation amount of the first process, wherein M1 represents a historical maximum memory usage amount corresponding to the first process, M2 represents a system historical minimum remaining memory amount corresponding to the first process, and M4 represents the second memory allocation amount of the first process.
The second memory allocation amount of the first process is less than the first memory allocation amount of the first process.
And 209, storing the second memory allocation amount of the first process.
And storing the second memory allocation amount of the first process for the next time when the first process accesses the system.
And step 210, allocating a memory for the second process according to a system preset memory value.
The system preset memory value is a memory default value preset by the system. It should be noted that the system allocates the memory for the accessed non-periodically running process according to the preset memory value of the system.
Optionally, when the preset memory value of the system cannot meet the operation requirement of the second process, the second process is temporarily not accessed to the system until the system has a sufficient amount of remaining memory.
The order of execution of step 208 and step 210 may be altered as desired, for example, step 210 may be performed before step 208 or step 208 and step 210 may be performed simultaneously.
And when the first process accesses the system next time, allocating the memory for the first process according to the second memory allocation amount of the first process.
Specifically, since the first process accesses the system through the first memory allocation amount of the first process last time, the remaining memory amount of the system is smaller than or equal to the memory allocation amount of the second process, that is, a new process requesting to access the system subsequently cannot access the system normally, when the connection request of the first process is received this time, the memory is allocated to the first process according to the second memory allocation amount of the first process, which is smaller than the first memory allocation amount of the first process, so that the remaining memory amount of the system is sufficient, and it is ensured that the new process requesting to access the system subsequently can access the system normally.
It should be noted that the method of this embodiment is not limited to the first memory allocation amount according to the first process or the second memory allocation amount according to the first processThe allocation allocates memory for the first process. Such as: when the second memory allocation amount of the first process is too large to enable a new process subsequently requesting to access the system to normally access the system, the third memory allocation amount of the first process may be further generated according to the historical maximum memory usage amount corresponding to the first process and the historical minimum remaining memory amount of the system, and specifically, according to a formula M5 ═ Min (M)1,M2*0.6183) And generating a third memory allocation amount of the first process.
In the memory allocation method provided in this embodiment, a remaining memory amount of a system is generated according to a first memory allocation amount of a first process generated in advance, if it is determined that the remaining memory amount of the system is less than or equal to a memory allocation amount of a second process, a second memory allocation amount of the first process is generated according to a historical maximum memory usage amount corresponding to the first process and a historical minimum remaining memory amount of the system, and a memory is allocated to the first process according to the second memory allocation amount. According to the method, the memory amount of the process is predicted through the historical data of the periodically running process, and flexible adjustment is performed when the predicted memory amount is too large, so that the running smoothness of the process can be improved, and the waste of the memory can be avoided.
EXAMPLE III
Fig. 3 is a schematic structural diagram of a memory allocation platform according to a third embodiment of the present invention, as shown in fig. 3, the platform includes: a generation module 11, a judgment module 12 and an allocation module 13.
The generating module 11 is configured to generate a remaining memory amount of the system according to a first memory allocation amount of a first process generated in advance, and if the determining module 12 determines that the remaining memory amount of the system is smaller than or equal to a memory allocation amount of a second process, generate a second memory allocation amount of the first process according to a historical maximum memory usage amount corresponding to the first process and a historical minimum remaining memory amount of the system.
The determining module 12 is configured to determine whether the remaining memory amount of the system is less than or equal to a memory allocation amount of a second process.
The allocation module 13 is configured to allocate the memory to the first process according to the second memory allocation amount.
Further, the platform further comprises: a receiving module 14 and an obtaining module 15.
The receiving module 14 is configured to receive a connection request of a first process.
The obtaining module 15 is configured to obtain a historical maximum memory usage amount and a historical minimum remaining memory amount of the system, which are stored in advance and correspond to the first process.
The generating module 11 is further configured to generate a first memory allocation amount of the first process according to the historical maximum memory usage amount and the system historical minimum remaining memory amount corresponding to the first process.
The allocating module 13 is further configured to allocate a memory for the first process according to the first memory allocation amount of the first process.
Further, the obtaining module 15 is further configured to obtain a second pre-stored memory allocation amount of the first process.
Further, the allocating module 13 is further configured to allocate a memory to the second process according to a preset memory value of the system if the determining module 12 determines that the remaining memory amount of the system is less than or equal to the memory allocation amount of the second process.
The memory allocation platform provided in this embodiment is used to implement the memory allocation method provided in the first embodiment or the second embodiment.
In the memory allocation platform provided in this embodiment, the generation module generates the remaining memory amount of the system according to the first memory allocation amount of the first process generated in advance, if the determination module determines that the remaining memory amount of the system is less than or equal to the memory allocation amount of the second process, the generation module generates the second memory allocation amount of the first process according to the historical maximum memory usage amount corresponding to the first process and the historical minimum remaining memory amount of the system, and the allocation module allocates the memory for the first process according to the second memory allocation amount. The platform can improve the running smoothness of the process on one hand, and can also avoid the waste of the memory on the other hand.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (9)
1. A method for allocating memory, comprising:
generating a first memory allocation amount of a first process according to a historical maximum memory usage amount corresponding to the first process and a system historical minimum remaining memory amount;
generating the residual memory amount of the system according to the pre-generated first memory allocation amount of the first process;
judging whether the residual memory amount of the system is less than or equal to the memory allocation amount of a second process;
if the residual memory amount of the system is judged to be less than or equal to the memory allocation amount of the second process, generating the second memory allocation amount of the first process according to the historical maximum memory usage amount corresponding to the first process and the historical minimum residual memory amount of the system;
allocating memory to the first process according to the second memory allocation amount;
the generating a second memory allocation amount of the first process according to the historical maximum memory usage amount and the system historical minimum remaining memory amount corresponding to the first process specifically includes:
by the formula M4 Min (M)1,M2*0.6182) And generating a second memory allocation amount of the first process, wherein M1 represents a historical maximum memory usage amount corresponding to the first process, M2 represents a system historical minimum remaining memory amount corresponding to the first process, and M4 represents the second memory allocation amount of the first process.
2. The method according to claim 1, further comprising, before generating the first memory allocation amount of the first process according to the historical maximum memory usage amount and the system historical minimum remaining memory amount corresponding to the first process:
receiving a connection request of a first process;
acquiring a pre-stored historical maximum memory usage amount corresponding to the first process and a system historical minimum remaining memory amount;
after the generating a first memory allocation amount of the first process according to the historical maximum memory usage amount corresponding to the first process and the historical minimum remaining memory amount of the system, the method further includes:
and allocating the memory for the first process according to the first memory allocation amount of the first process.
3. The method of claim 2, further comprising, prior to allocating memory for the first process according to the second memory allocation amount:
receiving a connection request of a first process;
and acquiring a second pre-stored memory allocation amount of the first process.
4. The memory allocation method of claim 1, further comprising:
and if the residual memory amount of the system is judged to be less than or equal to the memory allocation amount of the second process, allocating memory for the second process according to a preset memory value of the system.
5. The method according to claim 2, wherein the generating the first memory allocation amount of the first process according to the historical maximum memory usage amount and the system historical minimum remaining memory amount corresponding to the first process specifically comprises:
by the formula M3 Min (M)1,M20.618) generating a first memory allocation amount of the first process, wherein M1 represents a historical maximum memory usage amount corresponding to the first process, M2 represents a system historical minimum remaining memory amount corresponding to the first process, and M3 represents the first memory allocation amount of the first process.
6. A memory allocation platform, comprising: the device comprises a generation module, a judgment module and a distribution module;
the generating module is configured to generate a first memory allocation amount of the first process according to a historical maximum memory usage amount corresponding to the first process and a system historical minimum remaining memory amount; the system is further configured to generate a remaining memory amount of the system according to a pre-generated first memory allocation amount of the first process, and if the determining module determines that the remaining memory amount of the system is less than or equal to the memory allocation amount of the second process, generate a second memory allocation amount of the first process according to a historical maximum memory usage amount corresponding to the first process and a historical minimum remaining memory amount of the system; the generating a second memory allocation amount of the first process according to the historical maximum memory usage amount and the system historical minimum remaining memory amount corresponding to the first process specifically includes: by the formula M4 Min (M)1,M2*0.6182) Generating a second memory allocation amount of the first process, wherein M1 represents a historical maximum memory usage amount corresponding to the first process, M2 represents a system historical minimum remaining memory amount corresponding to the first process, and M4 represents the second memory allocation amount of the first process;
the judging module is configured to judge whether the remaining memory amount of the system is less than or equal to a memory allocation amount of a second process;
and the allocation module is used for allocating the memory to the first process according to the second memory allocation amount.
7. The memory allocation platform of claim 6, further comprising: the device comprises a receiving module and an obtaining module;
the receiving module is used for receiving a connection request of a first process;
the obtaining module is configured to obtain a pre-stored historical maximum memory usage amount and a system historical minimum remaining memory amount corresponding to the first process;
the allocation module is further configured to allocate the memory for the first process according to the first memory allocation amount of the first process.
8. The memory allocation platform of claim 7, wherein the obtaining module is further configured to obtain a second pre-stored memory allocation amount of the first process.
9. The memory allocation platform according to claim 6, wherein the allocation module is further configured to allocate a memory to the second process according to a preset memory value of the system if the determination module determines that the remaining memory amount of the system is less than or equal to the memory allocation amount of the second process.
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