Block Device Research Articles

Features of the strength abilities of the world's leading armwrestlers weighing 80-100 kg

Purpose: determination of the main components of power capabilities that ensure the success of the competitive exercise of armwrestlers weighing 80-100 kg. Material and Methods. The study involved 4 best armwrestlers in the world weighing from 80 to 100 kg (m = 87.50 ± 2.47 kg) in 2017–2020: athlete 1 is a multiple world champion weighing 90 kg (Ukraine), athlete 2 is a multiple champion world champion weighing 82 kg (Ukraine), athlete 3 - multiple world champion weighing 93 kg (Ukraine), athlete 4 - multiple winner of international competitions weighing 85 kg (USA). During the study, strength indicators were determined in 4 competitive exercises. Strength indices in all test exercises were measured in a static mode by an FB5k series electrical tenzodynamometer (Poland) with an accuracy class of up to 100 g, which was mounted on a special armwrestling table using a specially made block device. The created design was called the “ARM1 Device” (patent 43082). During the statistical analysis, the following parameters were calculated: maximum and relative strength, total strength index in four strength exercises (F), time to reach maximum strength (t), speed-strength index (F/t), average strength index of four exercises (F/4), gradient of the total strength of four exercises (t0,5F), strength index in the first 100 ms and 500 ms, speed-strength index in the first 500 ms (F500/t500), hour of reaching a force of 1 kg (t0,5F/(0,5×F); Pearson correlation analysis. Results. As a result of the study, the main data on the speed-strength indicators of armwrestlers were obtained and analyzed. In the process of testing, according to the indicators of time periods and given efforts of dynamic strength, the features of the manifestation of the explosive, fast and slow strength of arm wrestlers 80-100 kg were established. Conclusions. The study made it possible to establish indicators of the speed-strength index, strength gradient, the ability to manifest dynamic strength in the first 500 ms, clearly characterizing the speed-strength capabilities of armwrestlers and allowing to determine the features and nature of the manifestation of their dynamic strength. This makes it possible to determine the natural ability to manifest dynamic strength, as well as to select and predict the performance of promising athletes, to specify the direction and content of the training process, and to clarify the program of participation in competitions.

Superconducting Field-Effect Transistors with PdxTe-Te Intimate Contacts.

Superconducting-based electronic devices have shown great potential for future quantum computing applications. One key building block device is a superconducting field-effect transistor based on a superconductor-semiconductor-superconductor Josephson-junction (JJ) with a gate-tunable semiconducting channel. However, the performance of such devices is highly dependent on the quality of the superconductor to semiconductor interface. In this study, we present an alternative method to obtain a high-quality interface by using intimate contact. We investigate the proximity-induced superconductivity in chiral crystal tellurium (Te) and fabricate a PdxTe-Te-PdxTe JJ with an ambipolar supercurrent that is gate-tunable and exhibits multiple Andreev reflections. The semiconducting two-dimensional Te single crystal is grown hydrothermally and partially converted to superconducting PdxTe by controlled annealing. Our work demonstrates a promising path for realizing controllable superconducting electronic devices with high-quality superconducting interfaces; thus, we can continue to advance the field of quantum computing and other interface-based technologies.

Comparison of Skeletal Changes in the Temporomandibular Joint between the Twin Block Appliance and Fixed Functional Appliance: A Longitudinal Follow-up Study.

This current study evaluated and compared the skeletal changes in the head of the condyle, glenoid fossa, and articular space between the twin block appliance and PowerScope™ a fixed functional appliance. This study was a pilot, randomized, single-blinded, assessing the skeletal changes in the components of the temporomandibular joint (TMJ) using cone-beam computed tomography (CBCT). The study was conducted in 20 subjects in the age range of 11-14 years with class II division 1 malocclusion. These subjects were distributed randomly between two groups with an allocation ratio of 1:1 (group I-twin block and group I-PowerScope™). Follow-ups of both groups were done till desirable skeletal correction was attained (clinical edge-to-edge incisor relation). Condylar parameters such as position, height, and length were evaluated bilaterally in the CBCT scans. After using both devices, there was an increase in all condylar qualities; however, the twin block appliance showed a more noticeable difference, which has been determined to be statistically significant. In the twin block group, there was an average decrease of 0.56 mm in the anterior articular space and an increase of 1.2 and 2.64 mm in the middle and posterior articular spaces, respectively. In the PowerScope™ group, there was an average decrease of 0.23 mm in the anterior articular space and an increase of 2.55 and 1.85 mm in the middle and posterior articular spaces, respectively. In the case of the twin block device, the change in glenoid fossa angle was observed to be 6.1 mm on both sides and a mean difference of 1.25 mm on the right-side and 1.75 mm on the left-side was observed in the case of PowerScope™. The difference was established to be significant with a p < 0.05 in all cases. Condylar attributes increased after the application of both devices but the difference was more pronounced in the case of twin block appliances. The difference in articular space (middle and posterior) between the twin block group and PowerScope™ group, was not significant statistically. In the present study, the remodeling in the glenoid fossa was greater in the twin block group compared to the PowerScope™ group. Halapanavar B, MN P, Deshmukh S, et al. Comparison of Skeletal Changes in the Temporomandibular Joint between the Twin Block Appliance and Fixed Functional Appliance: A Longitudinal Follow-up Study. Int J Clin Pediatr Dent 2024;17(1):7-14.

Caiti: I/O transit caching for persistent memory-based block device

Byte-addressable non-volatile memory (NVM) sitting on the memory bus is employed to make persistent memory (pmem) in general-purpose computing systems and embedded systems for data storage. Researchers develop software drivers such as the block translation table (BTT) to build block devices on pmem, so programmers can keep using mature and reliable conventional storage stack while expecting high performance by exploiting fast pmem. However, our quantitative study shows that BTT underutilizes pmem and yields inferior performance, due to the absence of the imperative in-device cache. We add a conventional I/O staging cache made of DRAM space to BTT. As DRAM and pmem have comparable access latency, I/O staging cache is likely to be fully filled over time. Continual cache evictions and fsyncs thus cause on-demand flushes with severe stalls, such that the I/O staging cache is concretely unappealing for pmem-based block devices. We accordingly propose an algorithm named Caiti with novel I/O transit caching. Caiti eagerly evicts buffered data to pmem through CPU’s multi-cores. It also conditionally bypasses a full cache and directly writes data into pmem to further alleviate I/O stalls. Experiments confirm that Caiti significantly boosts the performance with BTT by up to 3.6×, without loss of block-level write atomicity.

Evaluating the Performance of SPDK-based io uring and AIO Block Device

Abstract: In the context of contemporary data processing and storage, this article examines the performance of asynchronous I/O interfaces that are provided by the Linux Kernel. Specifically, this study utilizes an SPDK-based block device module of io uring and AIO which offers features like request queueing and lockless queues. Our benchmarks comparing io uring and aio performance revealed an interesting dichotomy in their handling of random I/O patterns. Both approaches exhibited similar performance trends for random-read operations, showcasing a clear benefit from increasing the IO queue depth. This suggests both methods efficiently leverage parallel processing to boost read throughput. However, the story flips for random-write operations. Unlike read workloads, increasing queue depth for writes yielded no performance improvement. This increase significantly inflated latency, introducing undesired delays.

Perseid: A Secondary Indexing Mechanism for LSM-Based Storage Systems

LSM-based storage systems are widely used for superior write performance on block devices. However, they currently fail to efficiently support secondary indexing, since a secondary index query operation usually needs to retrieve multiple small values, which scatter in multiple LSM components. In this work, we revisit secondary indexing in LSM-based storage systems with byte-addressable persistent memory (PM). Existing PM-based indexes are not directly competent for efficient secondary indexing. We propose Perseid , an efficient PM-based secondary indexing mechanism for LSM-based storage systems, which takes into account both characteristics of PM and secondary indexing. Perseid consists of (1) a specifically designed secondary index structure that achieves high-performance insertion and query, (2) a lightweight hybrid PM-DRAM and hash-based validation approach to filter out obsolete values with subtle overhead, and (3) two adapted optimizations on primary table searching issued from secondary indexes to accelerate non-index-only queries. Our evaluation shows that Perseid outperforms existing PM-based indexes by 3–7× and achieves about two orders of magnitude performance of state-of-the-art LSM-based secondary indexing techniques even if on PM instead of disks.

Estimates of Phenotypic and Genotypic Variance and Heritability in Eighty-Nine Bambara Groundnut [Vigna subterranea (L.) Verdcourt] Accessions Collected from Six Regions of Niger

The bambara groundnut [Vigna subterranea (L.) Verdc. (Fabaceae)] is a legume mainly cultivated by women, for the nutritional quality of these seeds. It is a so-called minor culture and the improvement of the plant and its popularization remains to be promoted. The objective of this present work is to evaluate the genetic variability of bambara groundnut accessions. The experiment was carried out according to a completely randomized block device with four replications. Twenty-two (22) characters including four (4) phenological, four (4) morphological and fourteen (14) related to yield were evaluated for accessions characterization. Descriptive analysis showed significant differences. The coefficients of variation ranged from 3.51% (maturity date) to 38.87% (shell weight). Significantly high values (CV˃20%) for 8 of the metric parameters were observed. Pod weight per plant and seed weight per plant (r=0.943), yield in kg/ha (r=0.943); seed weight per plant and yield in kg/ha (r=0.999) showed the strongest correlations. The phenotypic and genotypic coefficients of variation were high for dry biomass weight (PCV=42.23%; GCV=28.40%), shell weight (PCV=63.46%; GCV=22.46%) and 100-seed weight (PCV=25.57%; GCV=25.25%). Maturity date (95.77%) and 100-seed weight (99.84%) had high heritabilities. Broad-sense heritability and genetic gain are high for 100-seed weight (H2=99.84%; GA=52.58%). The Ascending hierarchical classification produced four groups of which group 4 is the most efficient in yield with short (20.58cm) early accessions (80.32 days). Groups 1 and 2 include, late accessions (~22cm) with respectively maturity dates (DM=85.67 days and DM=86.53 days.

Drug-Free Noninvasive Thermal Nerve Block: Validation of Sham Devices.

Headache is a leading cause of disability and suffering. One major challenge in developing device treatments is demonstrating their efficacy given devices' often-high placebo rate. This paper reviews the importance of validating sham devices as part of finalizing the design for larger-scale prospective randomized controlled trials in patients with chronic headache as well as the results of a prospective, single-blind trial to validate two potential sham noninvasive thermal nerve block devices. Study participants were trained to self-administer thermal nerve block treatment using sham devices in an office visit. Two different sham systems with different temperature profiles were assessed. Devices were offered for patients to use daily at-home for one week to assess the durability of sham placebo effects before participants were given active treatment in a second office visit followed by another optional week of self-administered active treatment at-home use. Sham treatments reduced pain scores by an average of 31% from 6.0 ± 2.3 to 4.3 ± 3.3, including two participants who fell asleep during the in-office treatment and woke up with no pain, but whose pain recurred after returning home during at-home use of the sham system. In-office active treatments reduced pain scores by 52% from 6.7 ± 2.1 to 3.3 ± 2.9 with sustained pain relief during optional at-home use. Successful blinding for the study was confirmed with an ideal Bang's Blinding Index of 0 and an ideal James' Blinding Index of 1. Both the sham and active treatments were viewed by participants as highly credible, and credibility increased from the beginning to end of sham treatments on average.

Effect of pelleting crop residues on feed intake and digestibility in Djallonke sheep in North-sudanian zone of Burkina Faso

The effect of pelleting fodder on voluntary feed intake and digestibility in sheep was tested with sorghum straw and cowpea haulm in two forms (chopped and granulated). Twenty-four (24) sheep, of 18 to 24 months old, Djallonké breed were divided into 4 groups of 6 sheep following a random complete block device with four (04) treatments as follows: R1= 50% chopped sorghum straw + 50% chopped cowpea haulms, R2 = Granulated feed 1 (50% sorghum straw + 50% cowpea haulms), R3 = 50% chopped sorghum straw + 50% maize bran and R4 = Granulated feed 2 (50% chopped sorghum straw + 50% maize bran). Six (6) sheep per group underwent the intake trial, then consecutively five (5) sheep per group were retained and housed in digestibility cages for the digestibility test. The voluntary intake of dry matter varied from 417.5 g/d for ration 3 to 600.5 g/d for ration 2. In terms of nutrient intake, ration 1 (75. 26g) records the highest intake of crude protein, followed by ration 2 (70.15g). There is no difference in voluntary intake within rations with forage chopped (R1 and R3) and pellet rations (R2 and R4). The digestibilities of DM and OM are lower with R2, followed by R4; on the other hand, R1 and R3 showed the best levels of digestibility. The crude protein digestibility value is higher for R1 than for the others. The grounding and pelleting of forage did not improve the intake and digestibility of the rations. Additional studies are needed, especially on the size of ground feed, in order to better elucidate the nutritional value of pelleted fodder.

Clinical Application of Inferior Alveolar Nerve Block Device for Safe and Secure IANB by Any Operator.

The inferior alveolar nerve block (IANB) is an established technique with a success rate of 60-80%; however, large errors have been reported among operators. Some dentists do not prefer to use IANB because of the risk of complications. Nevertheless, it is a useful technique for pain control, and a secure IANB offers significant benefits to operators and patients. This case series study aimed to investigate the efficacy of the "IANB Device," a nerve block guide for IANB, and the adverse events associated with its use in clinical practice. IANB was performed using the device on five patients who had undergone detailed computed tomography examination for chronic orofacial pain in the third division of the trigeminal nerve. Lidocaine 1% (1 mL, no adrenaline added) was used as the local anesthetic. IANB was performed by three dentists with 2, 5, and 11 years of experience in orofacial pain treatment. Thus, the data were collected in triplicate for each patient. The primary endpoints were whether adjustment of the IANB device was required, changes in the sensation threshold of the lower lip, the time to disappearance of pain, the presence or absence of tongue sensation ("Do you have numbness in your tongue?": "Yes/No"), and discomfort (visual analog scale). The incidence of any other adverse events was recorded. The procedure was judged to be successful if the pain disappeared and an elevation in the sensation threshold of the lower lip was observed. Adjustment of the IANB device was not required in any patient. A significant elevation in the sensation threshold of the lower lip and the disappearance of pain were observed in all patients. Three of the five patients reported experiencing tongue numbness. Discomfort with the use of the IANB device was less than 30 mm on the visual analog scale. No notable complications were observed. The appropriate type, concentration, and dosage of the local anesthetic must be considered during general dental treatment and oral surgical procedures. Our findings suggest that the IANB device is useful for eliminating errors between operators, enhancing safety, and improving the success rate.

Variation in agro-physiological parameters of Vigna radiata (L. R. Wilczek) under different supplemental irrigation frequencies

The study was aimed at investigating the effect of supplemental irrigations on physiological and agronomic responses of mungbean through evaluation of transpiration, leaf water potential, chlorophyll content and seeds yield during drought pockets. A completely randomized block device with three replications was used to conduct the rainy season study. Four watering regimes were applied from the 26th day after seed sowing and during drought pockets: rain only (0J), tap water after 5 days without rain (5J), after 10 days without rain (10J) and after 15 days without rain (15J). Supplemental irrigation had a significant effect on transpiration, leaf water potential and chlorophyll content of plant leaves. Leaf water potential was the lowest and the highest transpiration at 70 DAS under the 5J supplemental irrigation regime, with higher chlorophyll content. The study also revealed that the frequency of irrigation every 5 days without rain significantly improved the harvest index (p?0.004), the number and mass of seeds per plant (p?0.001), justifying the choice of this water treatment for a better production of well-filled seeds and tops.

KVRangeDB: Range Queries for a Hash-based Key–Value Device

Key–value (KV) software has proven useful to a wide variety of applications including analytics, time-series databases, and distributed file systems. To satisfy the requirements of diverse workloads, KV stores have been carefully tailored to best match the performance characteristics of underlying solid-state block devices. Emerging KV storage device is a promising technology for both simplifying the KV software stack and improving the performance of persistent storage-based applications. However, while providing fast, predictable put and get operations, existing KV storage devices do not natively support range queries that are critical to all three types of applications described above. In this article, we present KVRangeDB, a software layer that enables processing range queries for existing hash-based KV solid-state disks (KVSSDs). As an effort to adapt to the performance characteristics of emerging KVSSDs, KVRangeDB implements log-structured merge tree key index that reduces compaction I/O, merges keys when possible, and provides separate caches for indexes and values. We evaluated the KVRangeDB under a set of representative workloads, and compared its performance with two existing database solutions: a Rocksdb variant ported to work with the KVSSD, and Wisckey, a key–value database that is carefully tuned for conventional block devices. On filesystem aging workloads, KVRangeDB outperforms Wisckey by 23.7× in terms of throughput and reduce CPU usage and external write amplifications by 14.3× and 9.8×, respectively.

ANALYSIS AND EVALUATION OF THE FEATURES OF THE MANIFESTATION OF DYNAMIC POWER IN LEADERS OF THE WORLD ARMWRESTLING

The article reveals the definition of the features of the manifestation of the dynamic strength of the world's leading armwrestlers. The study involved 3 of the world's best armwrestlers weighing from 62 to 74 kg: athlete 1 – multiple world champion (m = 62 kg); athlete 2 – multiple US champion, winner of international competitions (m = 62 kg); athlete 3 – champion of Ukraine, winner of international competitions (m = 74 kg). Four power test exercises have been identified that ensure the performance of a competitive action in arm wrestling: flexion of the fingers, stretch with a hammer, hook and bending the hand. These exercises were performed with the left and right hands. Strength indices in all test exercises were measured with an FB5k series electrical tenzodynamometer (Poland) with an accuracy class of up to 100 g, fixed on a specialized armwrestling table using a specially made block device – “ARM1 Device” (patent #43082). In the course of statistical analysis, the following parameters were calculated: maximum and relative strength, total strength index in four strength exercises (F), time to reach maximum strength (t), speed-strength index (F / t), average strength index of four exercises (F / 4), the gradient of the total strength of the four exercises (t0.5F), the strength index in the first 100 ms and 500 ms, the speed-strength index in the first 500 ms (F500 / t500), the time to reach a force of 1 kg (t0.5F / (0.5×F)); Pearson correlation analysis. The study made it possible to establish indicators of the speed-strength index, strength gradient, the ability to manifest dynamic strength in the first 500 ms, clearly characterizing the speed-strength capabilities of armwrestlers and allowing to determine the features and nature of the manifestation of their dynamic strength. These indicators make it possible to determine the natural ability to manifest one or another type of dynamic force; clarify the direction and content of the training process; to conduct an effective selection of armwrestlers at different stages of a long-term training process; predict the expected sports result; determine the tactics of competitive activity of each athlete.

Data Persistence Storage in VMs Cloud-Based Software

The virtual machine data persistence storage method in a cloud environment addresses the challenge of persistent storage for user data in cloud computing systems. This paper proposes a system and method that enables the creation and expansion of block devices for virtual machines. The method involves a major node receiving user requests, determining whether it is a block device creation or expansion request, and executing the appropriate steps. The major node interacts with storage nodes to create logical volumes and register them as block device services. By implementing this method, the issue of non-persistent storage for user data after virtual machine shutdown is effectively resolved. This paper presents a detailed description of the method, its background, research objectives, and a conclusion highlighting the significance and benefits of the proposed virtual machine data persistence storage system.

EOS deployment on Ceph RBD/CephFS with K8s

The present activity focused on the integration of different storage systems (EOS [1] and Ceph [2]) with the aim to combine the high level scalability and stability of EOS services with the reliability and redundancy features provided by Ceph. The work has been carried out as part of the collaboration between the national center of INFN (Italian Institute for Nuclear Physics) dedicated to Research and Development on Information and Communication Technologies and the Conseil Européen pour la Recherche Nucléaire (CERN), with the goal of evaluating and testing different technologies for next-generation storage challenges. This work leverages the well-known open-source container orchestration system, Kubernetes [3], for managing file system services. The results obtained by measuring the performances of the different combined technologies, comparing for instance block device and file system as backend options provided by a Ceph cluster deployed on physical machines, are shown and discussed in the manuscript.

Oasis : Controlling Data Migration in Expansion of Object-based Storage Systems

Object-based storage systems have been widely used for various scenarios such as file storage, block storage, blob (e.g., large videos) storage, and so on, where the data is placed among a large number of object storage devices (OSDs). Data placement is critical for the scalability of decentralized object-based storage systems. The state-of-the-art CRUSH placement method is a decentralized algorithm that deterministically places object replicas onto storage devices without relying on a central directory. While enjoying the benefits of decentralization such as high scalability, robustness, and performance, CRUSH-based storage systems suffer from uncontrolled data migration when expanding the capacity of the storage clusters (i.e., adding new OSDs), which is determined by the nature of CRUSH and will cause significant performance degradation when the expansion is nontrivial. This article presents MapX , a novel extension to CRUSH that uses an extra time-dimension mapping (from object creation times to cluster expansion times) for controlling data migration after cluster expansions. Each expansion is viewed as a new layer of the CRUSH map represented by a virtual node beneath the CRUSH root. MapX controls the mapping from objects onto layers by manipulating the timestamps of the intermediate placement groups (PGs). MapX is applicable to a large variety of object-based storage scenarios where object timestamps can be maintained as higher-level metadata. We have applied MapX to the state-of-the-art Ceph-RBD (RADOS Block Device) to implement a migration-controllable, decentralized object-based block store (called Oasis ). Oasis extends the RBD metadata structure to maintain and retrieve approximate object creation times (for migration control) at the granularity of expansion layers. Experimental results show that the MapX -based Oasis block store outperforms the CRUSH-based Ceph-RBD (which is busy in migrating objects after expansions) by 3.17× ∼ 4.31× in tail latency, and 76.3% (respectively, 83.8%) in IOPS for reads (respectively, writes).

A virtualisation performance evaluation approach for distributed block device

With the development of the information age, the volume of data is exploding and the operational and performance requirements of massive data are difficult to balance. The high cost of distributed storage systems with high data reliability and excellent random read and write performance, often consisting of multiple racks, multiple nodes and hundreds of disks, is a thorny issue for researchers. A tool to predict the performance of distributed storage architectures has been built based on a study of the cost of distributed storage architectures. Without hardware, enabling low cost and fast performance prediction. It also provides performance data and latency density to compare the performance of different workloads and architectures more intuitively, providing ideas for optimising the performance of distributed systems.

Growth modification treatment of mandibular retrognathism using twin block apparatus (case report)

Interceptive orthodontic treatment, which is growth modification treatment using removable appliances such as twin block, is effective in treating skeletal retrognathic mandibular abnormalities in growing patients. A 10-year-old female with class II den-toskeletal malocclusion with retrognathic mandibular was treated using a twin block device for 8 months of active period and 4 months of retention period to obtain class I skeletal relationships, class I molar and canine relationships and normal overjet and overbite. Treatment begins with recording the bite by instructing the patient to advance her lower jaw as needed, then ma-king a twin block tool design. Devices with maxillary and mandibular bite blocks are worn for at least 20 hours a day with con-trol intervals every 2 weeks. The treatment results were very good with the patient's skeletal relationship being class I. It was concluded that patients with retrognathic mandibular can be treated by growth modification using the twin block device, with good patient cooperation, this tool effectively stimulates mandibular growth.

Carbon Stock Assessment of Psiduim guajava L. (Myrtaceae) Agroforestry Systems in Septentrion Zone of Cameroon

The present study aims to quantify carbon storage in different biomass pools of Psidium guajava agroecosystems in the northern region of Cameroon in order to understand their contribution to climate change mitigation. The destructive and non-destructive methods were used according to a random complete Fisher block device with 4 repetitions. The results obtained show that the average total carbon stock of Psidium guajava agroecosystems in the northern zone of Cameroon is 44.44 ± 4.96 tC/ha. The total carbon stock varies by region; in the Adamawa region (46.30 ± 4.91 tC/ha); North (46.34 ± 4.93 tC/ha) and Far North (40.69 ± 4.98 tC/ha). These results show the considerable contribution of Psidium guajava agroecosystems in the fight against the mitigation of climate change in the Septentrion zone of Cameroon.

Ethnobotanical Survey and Agro-Morphological Characterization of Ginger (Zingiber officinale Rosc., Zingiberaceae) Cultivars in South Benin

Ginger (Zingiber officinale Rosc., Zingiberaceae), a cultivated annual herbaceous plant is one of the most important spices consumed in the world with many medicinal properties. It is an income-generating plant for its production. This study aims to document endogenous knowledge on speculation as well as an agro-morphological characterization in order to make it better known and to reveal its potential to the whole world. The ethnobotanical data obtained by a semi-structured survey conducted from a questionnaire in six (06) municipalities in southern Benin made it possible to determine the local taxonomy of Ginger, the cultural practices and the different uses of the species. Ginger has been introduced in Benin for decades and in all the area study. The local names for the species as well as its uses, vary according to locality. As for the agro-morphological characterization, a complete random block device composed of five sub-plots was used. The experimental data allowed us to obtain three classes with all the accessions collected. Ginger cultivation is widespread in the study area with production on a small area. The cultivation techniques adopted do not follow any defined technical itinerary and the production tools are often rudimentary. The cultivation of ginger is therefore limited despite its multiple medicinal and economic potential. The institutions in charge of agriculture do not have data concerning the cultivation of ginger in southern Benin.