CN104133782A - Adaptive management method and device of digital monitoring platform memory - Google Patents
Adaptive management method and device of digital monitoring platform memory Download PDFInfo
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- CN104133782A CN104133782A CN201410318274.5A CN201410318274A CN104133782A CN 104133782 A CN104133782 A CN 104133782A CN 201410318274 A CN201410318274 A CN 201410318274A CN 104133782 A CN104133782 A CN 104133782A
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Abstract
The invention discloses an adaptive management method and device of a digital monitoring platform memory. The adaptive management method of the digital monitoring platform memory comprises the following steps: setting a memory pool, and configuring a minimum cache with a preset volume for each video channel; according to volume of a frame which needs to be written in at present, calculating the cache required for each video channel, and applying for the cache for each video channel according to the calculated cache; monitoring the code rate change of each video channel; when the code rate becomes big, continuing to apply for the cache; and when the code rate becomes small, releasing residual cache space to the memory pool. The use efficiency of the memory can be improved, and the storage performance of a NVR (Network Video Recorder) is improved.
Description
Technical field
The present invention relates to memory management field, particularly relate to a kind of digital supervision platform internal memory adaptive management method and device.
Background technology
Video storage server (NVR), NVR is the abbreviation of (Network-Video-Recorder is network hard disk video recorder).The topmost function of video storage server is by network, to receive the digital video bit stream of IPC (web camera) device transmission, and stores, manages, thereby realizes the distributed structure/architecture advantage that networking brings.In simple terms, by video storage server, can watch simultaneously, browse, playback, management, a plurality of web cameras of storage.
Along with the development of security protection industry high-definition video technology and informationization technology, in the urgent need to what improve, be the properties of Internet video storage server (NVR), and memory property is one of performance most crucial in NVR properties.
What server performance was paid close attention to most is CPU usage and internal memory, and NVR server does not exist a large amount of calculating, so CPU usage is generally lower, but because code check changes greatly, the read-write duration is long, need to consume many internal memories.And general EMS memory management process is to give in advance the certain space of each passage fixed allocation according to maximum code stream, or adopt the method in a plurality of passage common memory pond.The mode of memory pool is better than first kind of way, can use by shared drive.But the internal memory of NVR is used local more, as video recording, Video Pre-recording, playback, downloads etc.These internal memories are used difference larger, as warning Video Pre-recording need to reach 20 seconds, and common Video Pre-recording 3 seconds.Even while only having video recording, it is also sizable that the code check of each front-end equipment changes, as code check may be low to moderate 256Kbps, and may be up to 8Mbps.In many Practical Projects, server configuration, video process, warning Video Pre-recording all may change, if adopt fixed memory pond mode, will cause waste in various degree to server resource so, or according to server hardware resource and different application, arrange, need to compile out like this NVR of different editions or revise configuration file.Along with the increasing NVR of platform deploy, while there is NVR cluster, former mode is more and more difficult to meet the demands.
Summary of the invention
Technical matters to be solved by this invention is: a kind of digital supervision platform internal memory management method is provided, and this EMS memory management process can effectively improve the utilization ratio of internal memory, improves the memory property of NVR.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is:
A digital supervision platform internal memory adaptive management method, comprises step:
S1, a memory pool being set, is the default big or small minimal cache of each video channel configuration;
S2, the frame sign writing according to current needs calculate the cache size that each video channel needs, and are each video channel application buffer memory according to calculated cache size;
S3, monitor each video channel code check and change, when code check becomes large, continuation application buffer memory; When code check diminishes, discharge unnecessary spatial cache to memory pool.
For solving the problems of the technologies described above, another technical scheme of the present invention is:
A digital supervision platform internal memory adaptive management device, comprises dispensing unit, buffer memory application unit and channel monitoring unit;
Described dispensing unit is used for arranging a memory pool, is the default big or small minimal cache of each video channel configuration;
Described buffer memory application unit calculates for the frame sign writing according to current needs the cache size that each video channel needs, and is each video channel application buffer memory according to calculated cache size;
Described channel monitoring unit is used for monitoring each video channel code check to be changed, when code check becomes large, and continuation application buffer memory; When code check diminishes, discharge unnecessary spatial cache to memory pool.
Beneficial effect of the present invention is: by memory pool is set, for each video channel configuration minimal cache, and the application buffer memory of the frame sign writing according to each video channel, thereby realize each video channel self-adaptation application according to actual needs buffer memory, effectively solve the internal memory waste that fixed memory pond mode is brought, improved the utilization factor of internal memory, and, the present invention changes by monitoring each video channel code check, adjusts the buffer memory of each passage, thereby further improves the utilization ratio of internal memory.
Accompanying drawing explanation
Fig. 1 is the method flow diagram of digital supervision platform internal memory management method in an embodiment of the present invention;
Fig. 2 is the functional block diagram of digital supervision platform internal memory management devices in an embodiment of the present invention;
Main label declaration:
10-dispensing unit; 20-buffer memory application unit; 30-channel monitoring unit.
Embodiment
By describing technology contents of the present invention, structural attitude in detail, being realized object and effect, below in conjunction with embodiment and coordinate accompanying drawing to be explained in detail.
The design of most critical of the present invention is: on the basis of the minimal cache of having distributed, according to video channel, write frame sign application buffer memory, and the Mobile state adjustment of going forward side by side, thus effectively improve the utilization ratio of internal memory.
Refer to Fig. 1, a kind of digital supervision platform internal memory adaptive management method, comprises step:
S1, a memory pool being set, is the default big or small minimal cache of each video channel configuration;
S2, the frame sign writing according to current needs calculate the cache size that each video channel needs, and are each video channel application buffer memory according to calculated cache size;
S3, monitor each video channel code check and change, when code check becomes large, continuation application buffer memory; When code check diminishes, discharge unnecessary spatial cache to memory pool.
From foregoing description, beneficial effect of the present invention is: the present invention is by arranging a memory pool, make each video channel can common memory, the present invention is the default big or small minimal cache of each video channel configuration, make every passage capable of being meet the requirement of basic operation, and on the basis of minimal cache, according to video channel, write frame sign application buffer memory, thereby realize each video channel self-adaptation application according to actual needs buffer memory, effectively solve the internal memory waste that fixed memory pond mode is brought, improved the utilization factor of internal memory, and, the present invention changes by monitoring each video channel code check, adjust the buffer memory of each passage, therefore, can be the internal memory that each passage application is enough timely, can prevent that again each passage from taking free memory simultaneously, thereby further improve the utilization ratio of internal memory.
Further, in the above-described embodiment, for reducing memory fragmentation, when described application buffer memory, the cache size of applying for is the multiple of minimal cache piece.Because of in video storage server (NVR) internal memory, the size of minimal cache piece is 256KB, so in the above-described embodiment, and the multiple that the cache size of applying for is 256KB.
Further, after described step S3, also comprise step S4, S4, judge in memory pool whether to surpass untapped memory headroom of the schedule time, if having, described untapped memory headroom is discharged to computer system.
By step S4, can realize the size of dynamic adjustment memory pool, make monitor supervision platform need to adjust the size of memory pool according to actual conditions, make the internal memory of digital supervision platform obtain rationally effectively using.
Further, for the buffer memory waste that prevents that video channel abnormal cause from causing, do not affect the normal work of other video channels, increased in the present embodiment video channel exception monitoring, when continuing application, video channel buffer memory becomes large, and while being greater than video channel maximal rate over Preset Time threshold values, judge that this video channel is abnormal, this video channel will be carried out packet loss processing.Wherein, maximal rate and time threshold values are determined according to actual conditions.
For example, in one embodiment, in the situation that buffering continues to apply for becoming large, the time that is greater than maximal rate 8Mbps when video channel code check surpasses 10 seconds, during buffer memory 10MB size, judges this channel abnormal, and packet loss is processed.
Further, for preventing applying for that the passage of buffer memory is too many, and cause application cache failure, in the above-described embodiment, when described application buffer memory, also comprise the maximum application of overall situation buffer memory quantitative value is set, when all video channels that need to apply for again buffer memory are applied for buffer memory quantitative value over described maximum, overage will not processed, and therefore, can prevent from normally recording a video because application buffer memory passage affects other passages too much.
When the video channel number of application buffer memory surpasses described maximum application buffer memory quantitative value, also generate daily record and warning.
Another embodiment of the present invention is:
A digital supervision platform internal memory adaptive management device, comprises dispensing unit 10, buffer memory application unit 20 and channel monitoring unit 30;
Described dispensing unit 10, for a memory pool is set, is the default big or small minimal cache of each video channel configuration;
Described buffer memory application unit 20 calculates for the frame sign writing according to current needs the cache size that each video channel needs, and is each video channel application buffer memory according to calculated cache size;
Described channel monitoring unit 30 changes for monitoring each video channel code check, when code check becomes large, and continuation application buffer memory; When code check diminishes, discharge unnecessary spatial cache to memory pool.
The present invention is by arranging a memory pool, make each video channel can common memory, the present invention is the default big or small minimal cache of each video channel configuration, make every passage capable of being meet the requirement of basic operation, and on the basis of minimal cache, according to video channel, write frame sign application buffer memory, thereby realize each video channel self-adaptation application according to actual needs buffer memory, effectively solve the internal memory waste that fixed memory pond mode is brought, improved the utilization factor of internal memory, and, the present invention changes by monitoring each video channel code check, adjust the buffer memory of each passage, therefore, can be the internal memory that each passage application is enough timely, can prevent that again each passage from taking free memory simultaneously, thereby further improve the utilization ratio of internal memory.
Further, the cache size that described buffer memory request slip is applied for is the multiple of minimal cache piece.Because of in video storage server (NVR) internal memory, the size of minimal cache piece is 256KB, so in the above-described embodiment, and the multiple that the cache size of applying for is 256KB.
Further, also comprise buffer memory releasing unit, described buffer memory releasing unit is used for judging in memory pool whether surpass untapped memory headroom of the schedule time, if having, described untapped memory headroom is discharged to computer system.
Further, also comprise abnormal deciding means;
Described abnormal deciding means becomes large for continue application when video channel buffer memory, and when being greater than video channel maximal rate and surpassing Preset Time threshold values, judges that this video channel is abnormal, and this video channel will be carried out packet loss processing.
Further, described buffer memory application unit 20 arranges an overall maximum application buffer memory quantitative value, and when all video channels that need to apply for again buffer memory are applied for buffer memory quantitative value over described maximum, overage will not processed.
In embodiments of the present invention, NVR can accomplish internal memory adaptive control from the following aspects:
One, video process rate adjust.
When code check becomes large in video process, by current, need to write caching frame size and this passage remaining space comparison, according to comparative result application buffer memory, the buffer memory of applying for is the multiple of minimal cache piece (256KB).For example, if the remaining space 50KB of certain passage need to write 300KB sized frames, can apply for again so the cache size (being the twice of minimal cache piece) of 512KB.If before current application, the buffer memory of distribution is 1MB, this passage takies 1.5MB size so.While again writing buffering, if space is still inadequate, application will circulate.
If passage code check remains unchanged, buffer memory meets the demands, and does not change again, and the total size of internal memory remains unchanged within a certain period of time so.
When if video channel code check diminishes, Memory adjustments need to lag behind a period of time, and concrete retardation time can be according to actual conditions setting, as defines 5 seconds.In program detects the time that reaches 5 seconds, some internal memory is always idle, and this part idle internal memory will be released.The memory size discharging is necessary for the multiple of cache blocks 256KB, and to reduce fragment, program internal memory unification, by internal memory pool managing, can facilitate use next time.
Two, between Video Pre-recording and video recording, switch
Video Pre-recording is usually used in reporting to the police, therefore be often called warning Video Pre-recording.The special effect because report to the police, in theory the Video Pre-recording time better more for a long time, the information that can catch is just more.Generally, warning Video Pre-recording code stream is 2Mbps, maximum 30 seconds of duration, and internal memory needs 7.5MB (2*30/8) like this.And code check 2Mbps is under common video recording pattern, only need the 1Mb just can the buffer memory data of 5 seconds, enough read and write thread writing in files far away.So when starting from Video Pre-recording, be switched to video recording, can use self-adaptation Memory Allocation equally.
Meanwhile, along with popularizing of HD video, the warning Video Pre-recording of code check 2Mbps can not meet the demands.So need to improve the code stream Video Pre-recording of reporting to the police, if warning Video Pre-recording code stream is set, be 4Mbps, duration is similarly 30 seconds, needs so the buffer memory of 15MB.So the buffer memory consumption of warning Video Pre-recording, by increasing, if do not adopt internal memory adaptive control, will be wasted memory source greatly, more cannot improve memory property.
So internal memory self-adaptation allocation scheme, seems even more important at Video Pre-recording and video recording in switch application, advantage is more obvious, has fully shown the making full use of of memory source, and guarantees and promote the memory property of NVR.
In sum, digital supervision platform internal memory management method provided by the invention and device can distribute spatial cache according to write incoming frame and the code check self-adaptation of each video channel, and the present invention can reduce memory fragmentation, has greatly improved the utilization factor of internal memory; The present invention is by monitoring video channel state, prevents the Memory Allocation waste that extremely causes because of video channel, and the present invention also need to adjust the size of memory pool according to actual conditions, make the internal memory of digital supervision platform obtain rationally effectively use.
The foregoing is only embodiments of the invention; not thereby limit the scope of the claims of the present invention; every equivalent structure or conversion of equivalent flow process that utilizes instructions of the present invention and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (10)
1. a digital supervision platform internal memory adaptive management method, is characterized in that, comprises step:
One memory pool is set, and is the default big or small minimal cache of each video channel configuration;
The frame sign writing according to current needs calculates the cache size that each video channel needs, and is each video channel application buffer memory according to calculated cache size;
Monitor each video channel code check and change, when code check becomes large, continuation application buffer memory; When code check diminishes, discharge unnecessary spatial cache to memory pool.
2. digital supervision platform internal memory adaptive management method according to claim 1, is characterized in that, when described application buffer memory, the cache size of applying for is the multiple of minimal cache piece.
3. digital supervision platform internal memory adaptive management method according to claim 1, it is characterized in that, also comprise, whether judge in memory pool over untapped memory headroom of the schedule time, if have, described untapped memory headroom is discharged to computer system.
4. according to the arbitrary described digital supervision platform internal memory adaptive management method of claims 1 to 3, it is characterized in that, when continuing application, video channel buffer memory becomes large, and while being greater than video channel maximal rate over Preset Time threshold values, judge that this video channel is abnormal, this video channel will be carried out packet loss processing.
5. according to the arbitrary described digital supervision platform internal memory adaptive management method of claims 1 to 3, it is characterized in that, when described application buffer memory, also comprise the maximum application of overall situation buffer memory quantitative value is set, when all video channels that need to apply for again buffer memory are applied for buffer memory quantitative value over described maximum, overage will not processed.
6. a digital supervision platform internal memory adaptive management device, is characterized in that, comprises dispensing unit, buffer memory application unit and channel monitoring unit;
Described dispensing unit is used for arranging a memory pool, is the default big or small minimal cache of each video channel configuration;
Described buffer memory application unit calculates for the frame sign writing according to current needs the cache size that each video channel needs, and is each video channel application buffer memory according to calculated cache size;
Described channel monitoring unit is used for monitoring each video channel code check to be changed, when code check becomes large, and continuation application buffer memory; When code check diminishes, discharge unnecessary spatial cache to memory pool.
7. digital supervision platform internal memory adaptive management device according to claim 6, is characterized in that, the cache size that described buffer memory request slip is applied for is the multiple of minimal cache piece.
8. digital supervision platform internal memory adaptive management device according to claim 6, is characterized in that, also comprises buffer memory releasing unit;
Described buffer memory releasing unit is used for judging in memory pool whether surpass untapped memory headroom of the schedule time, if having, described untapped memory headroom is discharged to computer system.
9. according to the arbitrary described digital supervision platform internal memory adaptive management device of claim 6 to 8, it is characterized in that, also comprise abnormal deciding means;
Described abnormal deciding means becomes large for continue application when video channel buffer memory, and when being greater than video channel maximal rate and surpassing Preset Time threshold values, judges that this video channel is abnormal, and this video channel will be carried out packet loss processing.
10. according to the arbitrary described digital supervision platform internal memory adaptive management device of claim 6 to 8, it is characterized in that, described buffer memory application unit arranges the maximum application of overall situation buffer memory quantitative value, when all video channels that need to apply for again buffer memory are applied for buffer memory quantitative value over described maximum, overage will not processed.
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