Abstract: Techniques for tracking a lock involve creating an event comprising object information, and extracting the object information in the event through a thread in a thread pool. Such techniques further involve recording lock information comprising the object information according to a determination that the thread executes a lock operation. Such a lock tracking technique for a threading model can record lock information of an object when a thread performs locking and unlocking, and realize tracking of a lock operation and generating a lock analysis report.

Abstract: Provided is a preparation method for a tube. The method comprises the following steps: a) adding a polymer solution into a poor solvent, such that the polymer diffuses on the liquid level of the poor solvent, so as to obtain a polymer film, wherein the solvent in the polymer solution is dissolved in the poor solvent; b) curling the polymer film on the liquid level of the poor solvent by using a mold to obtain a bar; and c) removing the mold to obtain a tube. The present invention further provides the use of the above tubular as an artificial tubular tissue.

Abstract: Provided are an oral solid tablet comprising (S)-7-[4-(1-acryloylpiperidine)]-2-(4-phenoxyphenyl)-4,5,6,7-tetrahydropyrazolo[1,5-a]pyrimidine-3-carboxamide and preparation method therefor. The oral solid tablet has good drug release characteristics, features easy administration, quick and high-efficient release, no particular requirements on equipment, and a simple formulation preparation process, can ensure formulation stability and facilitate transportation and storage, and is suitable for large-scale production.

Abstract: Techniques provide for data deduplication. Such techniques involve: allocating a storage area in a storage device, the storage area including a first storage segment for storing an incompressible data block and a second storage segment for storing a compressed data block, a first size of the first storage segment being greater than a second size of the second storage segment; in response to receiving a write request, determining whether data block to which the write request is related is compressible; in response to determining that the data block is incompressible, adding header information to the data block to generate a first data segment of the first size; and storing the first data segment in the first storage segment through a deduplication operation. Accordingly, such techniques can increase the flexibility and efficiency of data deduplication.

Abstract: Storage management techniques involve determining, if it is determined that lock information associated with a lock operation performed on an object is to be inserted into a storage device, a target digest for representing the lock information; determining whether an idle index not associated with a historical digest exists in an index array for indicating a plurality of storage positions in the storage device; and inserting, if it is determined that an idle index exists in the index array, the lock information into a target storage position in the plurality of storage positions by associating the target digest with the idle index. Accordingly, lock information can be quickly inserted and cleared, thereby improving the system performance.

Abstract: Techniques involve: selecting a stream from a plurality of streams having respective update frequencies, the update frequency of the selected stream matching an update frequency of to-be-written data; determining a label of the data based on a label of the selected stream; and sending a write request for the data to a storage system, the write request comprising the label of the data, so that the storage system performs a write operation for the data based on the stream identified by the label. Accordingly, a write amplification factor can be reduced, thereby increasing the effective life of a storage device and improving read and write performance of the storage system.

Abstract: Techniques involve implementing a file system. According to such techniques, a storage system creates a plurality of files in advance, each of which maintains a continuous space to simplify the process of processing read/write requests in the file system. When there is data to be written, an appropriate pre-created file is selected. Further, according to such techniques, a file system address is mapped to a physical address using a memory management unit. In this way, the file system performance is improved greatly.

Abstract: Techniques for cache management involve accessing, when a first data block to be accessed is missing in a first cache, the first data block from a storage device storing the first data block; selecting, when the first cache is full and based on a plurality of parameters associated with a plurality of eviction policies, an eviction policy for evicting a data block in the first cache from the plurality of eviction policies, the plurality of parameters indicating corresponding possibilities that the plurality of eviction policies are selected; evicting a second data block in the first cache to a second cache based on the selected eviction policy, the second cache being configured to record the data block evicted from the first cache; and caching the accessed first data block in the first cache. Such techniques can improve the cache hit rate, thereby improving the access performance of a system.

Abstract: Techniques to process metadata involve: in response to receiving a modification transaction for metadata on a computing device, acquiring information related to a busyness degree of the computing device; and according to at least a determination that the busyness degree is greater than a threshold degree, modifying the metadata in a metadata storage apparatus of the computing device directly without generating a log related to the modification transaction in a log storage apparatus of the computing device. Accordingly, such techniques can achieve good processing performance irrespective of a busy state or non-busy state of a computing device. In particular, when the computing device is in a busy state, a newly triggered modification transaction can still be timely executed, thereby improving IOPS performance of the computing device in a busy state.

Abstract: Techniques for storage management involve: in accordance with a determination that an input/output (I/O) request of a storage system is received, determining a target storage device to which the I/O request is directed. The techniques further involve: in accordance with a determination that the target storage device is a storage device of a first type, processing the I/O request by accessing a memory of the storage system. The techniques further involve: in accordance with a determination that the target storage device is a storage device of a second type different from the first type, processing the I/O request without accessing the memory, the storage device of the second type having an access speed higher than that of the storage device of the first type. Accordingly, such techniques can improve performance of a storage system.

Abstract: Techniques for storing data involve estimating a hit ratio of a digest cache associated with a target storage device, the digest cache recording a digest of data that is stored in the target storage device after preprocessing; generating, according to a determination that the hit ratio is lower than a predetermined threshold, a digest for target data to be stored and performing the preprocessing; and storing, according to a determination that the digest of the target data is missing in the digest cache, the preprocessed target data in the target storage device, and recording the digest of the target data in the digest cache. Such techniques can achieve good system performance in both cases of high data repetition and low data repetition.

Abstract: Techniques for data writing involve: determining an unavailable storage zone in multiple storage zones of a storage area, wherein each storage zone is used to store a zip header and compressed data corresponding to the zip header; acquiring a reference zip header for the unavailable storage zone, wherein the reference zip header includes metadata indicating a zone length of the unavailable storage zone; and generating consecutive write requests for the storage area based at least on target data to be written to the storage area and the reference zip header, so as to write the target data to available storage zones in the multiple storage zones. Accordingly, rewriting of data can be implemented by constructing large consecutive write requests, thus improving the write performance of the storage device.

Abstract: Techniques for managing threads involve acquiring respective runtime addresses and call information of a plurality of lock objects in a plurality of threads, and determining, from the plurality of lock objects, a first group of lock objects associated with first call information and a second group of lock objects associated with second call information different from the first call information. The techniques further involve providing an indication that a deadlock exists in the plurality of threads if it is determined that a first group of runtime addresses of the first group of lock objects overlaps with a second group of runtime addresses of the second group of lock objects. Accordingly, potential deadlocks in a plurality of threads can be analyzed, thereby avoiding the inability of the threads to proceed normally due to the deadlocks.

Abstract: A data compression technique involves: selecting, from a data block, a plurality of bit strings as sample data. The technique further involves: determining a set of characters included in the sample data. Each character in the set of characters is represented by at least one bit string among the plurality of bit strings. The technique further involves: compressing the data block if statistical characteristics of the set of characters match predetermined statistical characteristics. Accordingly, incompressible data can be filtered out efficiently and accurately, so as to utilize computing resources more efficiently.

Abstract: Techniques involve receiving a write request for writing metadata of a file system into a solid state disk having a multi-level cell, and then caching the to-be-written metadata into a memory. The techniques further involve sequentially writing the cached metadata into the solid state disk by redirect-on-write. Accordingly, there is a file system implemented for properties of a solid state disk having a multi-level cell. Such techniques are able to provide completely sequential write of metadata of the file system by supporting redirect-on-write, thereby reducing the write amplification of the solid state disk and improving the performance of the file system.

Abstract: Techniques for data writing involve: determining an unavailable storage zone in multiple storage zones of a storage area, wherein each storage zone is used to store a zip header and compressed data corresponding to the zip header; acquiring a reference zip header for the unavailable storage zone, wherein the reference zip header includes metadata indicating a zone length of the unavailable storage zone; and generating consecutive write requests for the storage area based at least on target data to be written to the storage area and the reference zip header, so as to write the target data to available storage zones in the multiple storage zones. Accordingly, rewriting of data can be implemented by constructing large consecutive write requests, thus improving the write performance of the storage device.

Abstract: Techniques for managing threads involve acquiring respective runtime addresses and call information of a plurality of lock objects in a plurality of threads, and determining, from the plurality of lock objects, a first group of lock objects associated with first call information and a second group of lock objects associated with second call information different from the first call information. The techniques further involve providing an indication that a deadlock exists in the plurality of threads if it is determined that a first group of runtime addresses of the first group of lock objects overlaps with a second group of runtime addresses of the second group of lock objects. Accordingly, potential deadlocks in a plurality of threads can be analyzed, thereby avoiding the inability of the threads to proceed normally due to the deadlocks.

Abstract: Techniques delete snapshot data. In accordance with certain techniques, a first sub-process of a snapshot deletion process on a first data block of the snapshot data is performed with a first thread. The snapshot deletion process includes at least the first sub-process and a second sub-process, the first and second sub-processes being performed sequentially. In response to an end of the first sub-process performed with the first thread, the second sub-process on the first data block is performed with the first thread. In parallel with performing, with the first thread, the second sub-process on the first data block, the first sub-process on a second data block of the snapshot data is performed with a second thread different from the first thread, the second data block being different from the first data block. Such techniques improve IO lock contention, system resource utilization rate and parallelism, response time and system overhead.

Abstract: Techniques involve managing a storage system. A target storage device is selected from multiple storage devices associated with the storage system in response to respective wear degrees of the multiple storage devices being higher than a first predetermined threshold. Regarding multiple extents in the multiple storage devices, respective access loads of the multiple extents are determined. A source extent is selected from multiple extents residing on storage devices other than the target storage device, on the basis of the respective access loads of the multiple extents. Data in the source extent are moved to the target storage device. Various storage devices in a resource pool may be prevented from reaching the end of life at close times, and further data loss may be avoided.

Abstract: Embodiments of the present disclosure relate to a method, an electronic device, and a computer program product for managing a disk. The method includes: acquiring a model for determining a remaining life of a disk, wherein the model is trained by taking a set of parameters related to a failure of a group of reference disks as an input and taking a reference remaining life of the group of reference disks at the time when the set of parameters are acquired as an output; acquiring a parameter related to a remaining life of a target disk, wherein the parameter indicates usage information of the target disk when it is used; and applying the parameter to the model to determine the remaining life of the target disk. With the technical solution of the present disclosure, a remaining life of a disk can be predicted, so that the disk can be actively replaced before it fails.