投稿時間:2022-07-27 21:29:55 RSSフィード2022-07-27 21:00 分まとめ(35件)

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ROBOT	ロボスタ	ヤマハ発動機が「バーチャルマーケット2022 Summer」に出展　VRシェアライドの電動アシスト自転車でメタバースの世界を駆け巡ろう	https://robotstart.info/2022/07/27/vket-yamaha-2022.html		2022-07-27 11:09:27
AWS	lambdaタグが付けられた新着投稿 - Qiita	Lambdaの関数URLとNetworkXを利用してネットワークグラフをWeb画面に表示する	https://qiita.com/ta983kata/items/94b9fb2d953f5fdae1b2	awslamdba	2022-07-27 20:16:45
python	Pythonタグが付けられた新着投稿 - Qiita	PyG (PyTorch Geometric) で Recurrent Graph Neural Network	https://qiita.com/maskot1977/items/46307251c36e7ef27e59	recurrentgraphneuralnet	2022-07-27 20:45:30
python	Pythonタグが付けられた新着投稿 - Qiita	cosθ の 計算方法(Python)	https://qiita.com/caleb7023/items/760766a3f82a40249d1a	frace	2022-07-27 20:31:56
js	JavaScriptタグが付けられた新着投稿 - Qiita	Google Spread Sheetで管理するLINE BOTの作り方【その３】	https://qiita.com/WdknWdkn/items/2aa95a8c9c31242780b4	googlespreadsheet	2022-07-27 20:12:11
AWS	AWSタグが付けられた新着投稿 - Qiita	Lambdaの関数URLとNetworkXを利用してネットワークグラフをWeb画面に表示する	https://qiita.com/ta983kata/items/94b9fb2d953f5fdae1b2	awslamdba	2022-07-27 20:16:45
AWS	AWSタグが付けられた新着投稿 - Qiita	【AWS】勉強したことをまとめる	https://qiita.com/monaka33/items/b5b27bba067f1a367b78	範囲	2022-07-27 20:01:42
海外TECH	DEV Community	Redis Monitoring | 101 Guide to Redis Metrics Monitoring	https://dev.to/signoz/redis-monitoring-101-guide-to-redis-metrics-monitoring-54jf	Redis Monitoring Guide to Redis Metrics MonitoringMonitoring Redis for performance issues is critical Redis is famous for its low latency response while serving a large number of queries There are certain key metrics that you can monitor to keep track of your Redis instance performance In this guide we will go through key Redis metrics that should be monitored and ways to collect these metrics with in built Redis tools What is Redis Redis which stands for Remote Dictionary Server is an open source in memory database with a variety of use cases It was developed by Salvatore Sanfilippo and was launched in It is famous as a key value oriented NoSQL database and due to its in memory database it can serve data almost instantaneously Redis can be used for multiple use cases CachingCaching is the most popular use case of the Redis database Real time applications that deal with vast amounts of data use Redis as low latency highly available in memory cache DatabaseRedis became popular as a caching database but is now also used as a primary database Modern applications are using Redis as a primary database to reduce the complexity of using it with another database like DynamoDB Streaming EngineThe in memory data store of Redis can power live streams of data Message BrokerMessage brokers have become a critical component of high scale distributed systems Redis implements a pub sub messaging queue that supports pattern matching along with different types of data structures Database lies in the hot path for most of the applications and any insight into its performance is valuable It s important to monitor Redis instances for performance and availability In this post we will go over some key Redis metrics that should be monitored Important Redis metrics to monitorAs Redis is an in memory data store it s important to monitor its resource utilization We also need to monitor its performance in terms of throughput or work done Redis monitoring metrics can be divided into the following categories PerformanceMemoryBasic ActivityHere s a list of Redis monitoring metrics at a glance PerformanceMemoryActivityLatencyMemory Usageconnected clientsCPU usageMemory fragmentation ratioblocked clientsHit RateKey evictionsconnected slavestotal commands processedkeyspaceDepending on your use case you can expand on this list to include other metrics too Performance MetricsDatabase performance issues can lead to a bad user experience Redis performance can be measured through latency CPU time and Hit Rate among other metrics Let s have a look at these metrics LatencyLatency is an important metric for measuring Redis performance It measures the time taken for the Redis server to respond to client requests Redis is popular as a low latency in memory database and is often used for demanding use cases Redis provides various ways to monitor latency metrics A quick way to check latency is to use the following command redis cli latency h p The above command continuously samples latency by issuing PING It returns an output as shown below The different parameters in the output are described below samples Number of times the Redis CLI issued PING This is the sample dataset For example the above command recorded requests and responses min Represents the minimum delay between the time when CLI issued PING and the time when the reply was received In this case it is ms max Represents the maximum delay between the time when CLI issued PING and the time when the reply was received In this case it is ms avg Average response times for all sampled data In this case it is msThere are other ways to monitor Redis latency Redis introduced Latency monitor Using latency monitor you can identify and troubleshoot possible latency problems For continuous monitoring of latency you will need a dedicated monitoring system CPU UsageRedis CPU usage spikes can cause latency across your application CPU usage is calculated using CPU time CPU time is the amount of time a CPU spends processing a non idle task CPU time is usually expressed as a percentage of the total CPU s capacity which is known as CPU usage If you identify high CPU usage caused by Redis you should investigate further A good practice is to set TTL for keys that are supposed to live temporarily High CPU usage can also be correlated to commands taking more time to execute You can get a list of such commands by using the Redis slowlog CPU Time monitored on SigNoz Redis Dashboard Cache Hit RatioRedis cache hit ratio is one of the important performance metrics to monitor It indicates the usage efficiency of the Redis instance The ratio represents the percentage of successful hits reads out of all read operations It is calculated as follows Cache Hit Ratio keyspace hits keyspace hits keyspace misses The Redis INFO command gives you the total number of keyspace hits and keyspace misses A cache hit ratio above is good to have If the ratio is below then it means a significant amount of keys have expired or are evicted It can also indicate insufficient memory allocation since most keys are evicted It is usually a good practice to use a dedicated monitoring tool to monitor Redis cache hit ratio Memory MetricsMemory is a critical resource for Redis As an in memory database the performance of Redis instances depends on sufficient memory resources Let s have a look at important memory metrics for Redis Memory UsageIf the memory usage of the Redis instance exceeds the total available memory it leads to memory swapping Memory swapping involves reclaiming memory space by moving unused memory contents to the disk Writing or reading from disk is much slower and defeats the purpose of using Redis Tracking memory usage can ensure that Redis instances use less memory than total available memory You can also configure the maximum memory for Redis using the maxmemory directive The settings can be configured using the redis config file or later by using the CONFIG SET command at runtime When the memory used by Redis reaches the specified amount you can use key eviction policies to free up some space Memory Fragmentation RatioMemory fragmentation issues can lead to reduced performance and increased latency Memory fragmentation ratio is defined as the ratio of memory allocated by the operating system to used memory by Redis Let s break it down further The operating system allocates physical memory to each process Ideally Redis needs contiguous sections of memory to store its data But if the operating system is unable to find a contiguous section it will allocate fragmented memory sections to store Redis data which leads to overhead in memory usage Memory fragmentation in Redis is calculated as the ratio of used memory rss to used memory used memory rss It is defined as the number of bytes allocated by the operating system used memory It is defined as the number of bytes allocated by Redis A memory fragmentation ratio greater than and closer to is considered healthy If it is lower than it means you need to allocate more memory to Redis immediately or it will start to swap memory Memory fragmentation ratio greater than indicates excessive memory fragmentation You will have to restart your Redis server to fix excessive memory fragmentation A snapshot of used memory and used memory rss using the info memory command gt info memory Memoryused memory used memory human Mused memory rss used memory rss human MIn the above snapshot the memory fragmentation ratio is above indicating excessive memory fragmentation You can monitor memory fragmentation ratio with Redis dashboards in SigNoz Memory fragmentation ratio monitored using SigNoz Key EvictionWhen Redis hits the max memory limit you need to evict keys based on an eviction policy It s a usual process of automatically evicting old data as new data gets added Users can use the maxmemory directive to limit Redis memory usage to a fixed amount Above this fixed amount old keys start getting evicted Redis runs operations as a single threaded process A higher key eviction rate can lead to lower response times hence it is important to monitor the key eviction rate Evicted keys monitored using SigNoz Basic Activity MetricsApart from performance and memory metrics it is useful to know some basic activity metrics of the Redis instance Below is the list of basic activity metrics that you should monitor along with their definition connected clientsNumber of client connections excluding connections from replicas blocked clientsNumber of clients pending on a blocking call connected slavesNumber of connected replicas total commands processedTotal number of commands processed by the Redis instance keyspacekeyspace is one of the sections in the Redis INFO command It s important to know the number of keys in the database The keyspace parameter provides statistics about the number of keys and the number of keys with an expiration How to collect Redis metrics You can access statistics about the Redis server using the Redis command line interface redis cli The INFO command returns a lot of useful information about the health and performance of running Redis instances You can also use the metrics provided by the INFO command to calculate important Redis metrics Redis INFO command provides you with information on the following ten sections ServerClientsMemoryPersistencestatsreplicationCPUcommandstatsclusterkeyspaceIf Redis is running as an instance on your machine you can access the following stats easily For example below is a snapshot of using the INFO command with the server parameter redis cli gt info server Serverredis version redis git sha redis git dirty redis build id baeeceredis mode standaloneos Darwin armarch bits monotonic clock POSIX clock gettimemultiplexing api kqueueatomicvar api c builtingcc version process id process supervised norun id ccecacffebfecbaetcp port server time usec uptime in seconds uptime in days hz configured hz lru clock executable opt homebrew opt redis bin redis serverconfig file opt homebrew etc redis confio threads active gt Redis Latency MonitorRedis and above comes with Redis Latency Monitor You can use it to check and troubleshoot possible latency problems The first step toward enabling the Latency monitor is to set a latency threshold The configuration takes a threshold value in milliseconds and logs all events that block the server for more than milliseconds You can enable the latency monitor at runtime in a production server with the following command CONFIG SET latency monitor threshold Once the configuration is done you can interact with the Latency monitor using a set of Latency commands LATENCY LATEST  returns the latest latency samples for all events LATENCY HISTORY  returns latency time series for a given event LATENCY RESET  resets latency time series data for one or more events LATENCY GRAPH  renders an ASCII art graph of an event s latency samples LATENCY DOCTOR  replies with a human readable latency analysis report Redis slowlogRedis slowlog can be used to trace and debug Redis databases You can use this command from the redis cli It helps you to identify queries that took more than a specified execution time Here s how to use it gt slowlog help SLOWLOG lt subcommand gt lt arg gt value opt Subcommands are GET lt count gt Return top lt count gt entries from the slowlog default mean all Entries are made of id timestamp time in microseconds arguments array client IP and port client name LEN Return the length of the slowlog RESET Reset the slowlog HELP Prints this help gt Final ThoughtsIn this post we went over some key Redis monitoring metrics Redis provides a number of in built tools to access performance snapshots It is helpful in case of quick check in or debugging But you need a dedicated monitoring system to keep track of how your Redis instances are performing over time A monitoring tool that allows you to store query and visualize Redis monitoring metrics can help you debug performance issues quickly For modern applications based on a distributed architecture it is important to correlate your Redis metrics with the rest of the application infrastructure You can set up Redis monitoring using open source APM SigNoz SigNoz is built to support OpenTelemetry which is becoming the world standard for instrumenting cloud native applications Redis monitoring dashboard in SigNozIn the following post we guide you on how to setup Redis monitoring using OpenTelemetry and Signoz Redis Monitoring with OpenTelemetry and SigNoz	2022-07-27 11:30:31
海外TECH	DEV Community	Take the poll - Golang Open Source Projects	https://dev.to/golangch/take-to-poll-golang-open-source-projects-29em	Take the poll Golang Open Source ProjectsI m doing a Poll about how Golang Developers are involved in Open Source Projects or as owner or contributor to other Go related projects Please participate as a Go Dev and take the chance to reply with your Golang OS repo url to get some drive Thanks and CheersStefan	2022-07-27 11:04:47
Apple	AppleInsider - Frontpage News	Apple buys new campus for $445 million for vast San Diego expansion	https://appleinsider.com/articles/22/07/27/apple-buys-new-campus-for-445-million-for-vast-san-diego-expansion?utm_medium=rss	Apple buys new campus for million for vast San Diego expansionApple has acquired the existing Rancho Vista Corporate Center in San Diego as part of its continued plan to expand hardware and software engineering in the region Apple Maps view of the Rancho Vista Corporate CenterIn Apple committed to adding new technology jobs in San Diego by and saying it hoped to establish a new campus there Since then it has reportedly been leasing buildings across University City and Rancho Bernardo but it has now bought the acre Rancho Vista Corporate Center for million Read more	2022-07-27 11:33:16
海外TECH	Engadget	Spotify has 188 million Premium users, but continues to lose money	https://www.engadget.com/spotify-q2-2022-113946036.html?src=rss	Spotify has million Premium users but continues to lose moneySpotify s second quarter financial release shows the streaming giant hasn t yet felt the dread hand of the looming global recession Unlike Netflix which had to report a fall in its overall customer base Spotify has seen both free and paying accounts grow It now has million users up from the million reported at the end of the first quarter million of those are paying for Premium a leap of six million from three months ago while a further four million are signed up on an ad supported basis Despite industry wide fears that household budgets would cut entertainment costs to help free up much needed cash Spotify has dodged cost cutting so far The company said that while it was keeping an eye on the “uncertain environment it was “pleased with the resilience of its business That said the company did spend big to help grow its user figures with marketing campaigns designed to coax back users who let their subscriptions lapse or who wanted to expand to a family plan That marketing spend helped blow a hole in the company s finances with Spotify posting a quarterly loss of € million million The company is banking on sharp increases in revenue both for subscriptions and advertising to help balance those losses out In addition its plan to pivot toward cheaper forms of audio content like podcasts and audiobooks should see the volume of cash it pays to record labels fall to a more tolerable for Spotify level ーeven if recording artists continue to demonstrate that they re being starved of an income by the piddling royalties paid out on a per stream basis	2022-07-27 11:39:46
海外TECH	Engadget	The Morning After: Instagram head responds to test feed backlash	https://www.engadget.com/the-morning-after-instagram-head-responds-to-test-feed-backlash-111511641.html?src=rss	The Morning After Instagram head responds to test feed backlashInstagram s TikTok like test feed is underwhelming and a lot of people hate it But it s not going anywhere Social network head Adam Mosseri posted a Twitter clip acknowledging the video focused trial feed is not yet good He also said Instagram would invariably become more video centric over time as that was the content being shared on the network Mosseri also defended the rise of recommended posts in users feeds He said they were the most effective and important way for creators to grow their audiences Users can pause all recommendations for a month but is that a priority for creators or the audience It s a bit of a chicken or egg situation ーMat SmithThe biggest stories you might have missedFaraday Future delays the launch of its first electric vehicle yet again Rollerdrome preview Twitchy dystopian bloodsport is my new favorite genreNetflix s The Gray Man is getting a sequel and a spin offAmazon s Prime subscription is getting more expensive across EuropeMeta is shutting down its couples messaging app you didn t know existed Volkswagen begins ID electric vehicle production in the USPlayStation VR will offer livestreaming support and a Cinematic Mode Two of Europe s biggest internet satellite companies are merging to take on StarlinkThe best smart home gadgets you can buy right nowMeta calls for the death of the leap secondRussia says it will pull out of the International Space Station after The country will focus on building its own space outpost The head of Russia s space program says the country will withdraw from the International Space Station after It will instead focus on building its own space station as a successor to Mir Russia and its cosmonauts will remain on the ISS for at least the next two and a half years to fulfill obligations to partners Earlier this month NASA and Roscosmos signed an agreement to swap seats on flights to the ISS starting in September Continue reading Logitech s new Aurora gaming accessories are inclusive but expensiveThey offer new colors designs for smaller hands and pricey accessories LogitechLogitech s Aurora Collection is a line of gender inclusive gaming accessories a mouse keyboard and headset The devices are built around comfort approachability and playfulness based on feedback from women gamers across the community the company said There are some interesting features but at relatively high prices indicative of a pink tax for products designed for women Continue reading Seville is naming heat waves like hurricanes thanks to climate changeZoe arrived this week The city of Seville is trying something new to raise awareness of climate change With oppressive heat waves becoming a fact of life in Europe and other parts of the world the Spanish metropolis has begun naming them The first one Zoe arrived this week bringing with it expected daytime highs above degrees Fahrenheit or degrees Celsius It s a system akin to ones organizations like the US National Hurricane Center have used for decades to raise awareness of impending tropical storms tornadoes and hurricanes The idea is that people are more likely to take a threat seriously and act accordingly when it s given a name Continue reading This is what Saudi Arabia s mile long emission free smart city could look likeThe Line is part of Saudi s controversial Neom mega city project Saudi ArabiaThe Saudi government has released image renders of what The Line could look like The linear city was designed to only be meters feet wide but meters feet tall and kilometers miles long It will house multiple communities encased in a glass facade running along the coast and will eventually accommodate up to nine million residents The plans feature no roads or cars and the city would run purely on renewable energy The Line is part of Saudi s billion Neom mega city project beset with controversy from the time it started Around people will be forced to relocate by its construction Continue reading	2022-07-27 11:15:11
海外TECH	Engadget	Amazon's one-day Instant Pot sale takes up to 52 percent off pressure cookers and air fryers	https://www.engadget.com/amazon-one-day-instant-pot-sale-110706774.html?src=rss	Amazon x s one day Instant Pot sale takes up to percent off pressure cookers and air fryersIf you re one of the few people in the US who ve yet to get an Instant Pot ーor if you want another model to add to the one s you already have ーthis is your chance to grab one at a discount Amazon is holding a one day sale for the brand s products including the quart Instant Pot Vortex Air Fryer which is currently listed on the website for percent off At that s the lowest price we ve seen on Amazon for the air fryer oven combo that has an original retail price of While Instant Pot Vortex is an air fryer it also has one touch controls for baking roasting and reheating You can also create customized programs for specific types of food so you can cook wings potatoes or even cinnamon buns with a single touch Buy Instant Pot air fryers and pressure cookers at Amazon Up to percent offInstant Pot s quart in Duo Plus model is also on sale if you what you need is the brand s classic pressure cooker It has dropped back to an all time low of or less than its retail price The Duo Plus has nine functions in one device and could act as a rice cooker slow cooker yogurt maker steamer sautépan food warmer sous vide and sterilizer in addition to being a pressure cooker It has customizable programs to make cooking ribs cake soup among other types of food a lot easier as well nbsp But if you re looking to get an air fryer and a pressure cooker on a limited budget you can get the Instant Pot Duo Crisp instead It has nine functionalities that include air frying and pressure cooking ーplus it lets you easily switch between lids especially designed for each function The Duo Crisp is currently on sale for which off its retail price You ll find a few more models to choose from on the deals homepage Some of them aren t selling for their all time low prices at the moment but Instant Pots are always a great pick up on a deal All products recommended by Engadget are selected by our editorial team independent of our parent company Some of our stories include affiliate links If you buy something through one of these links we may earn an affiliate commission	2022-07-27 11:07:06
海外TECH	CodeProject Latest Articles	Migrating the Jacobi Iterative Method from CUDA to SYCL	https://www.codeproject.com/Articles/5337661/Migrating-the-Jacobi-Iterative-Method-from-CUDA-to	Migrating the Jacobi Iterative Method from CUDA to SYCLThis document demonstrates how a linear algebra Jacobi iterative method written in CUDA can be migrated to the SYCL heterogenous programing language	2022-07-27 11:59:00
海外科学	NYT > Science	Fentanyl From the Government? A Vancouver Experiment Aims to Stop Overdoses	https://www.nytimes.com/2022/07/26/health/fentanyl-vancouver-drugs.html	Fentanyl From the Government A Vancouver Experiment Aims to Stop OverdosesA city on the forefront of harm reduction has taken the concept to a new level in an effort to address the growing toxicity of street drugs	2022-07-27 11:41:31
金融	金融庁ホームページ	鈴木財務大臣兼内閣府特命担当大臣閣議後記者会見の概要（令和４年７月26日）を公表しました。	https://www.fsa.go.jp/common/conference/minister/2022b/20220726-1.html	内閣府特命担当大臣	2022-07-27 12:02:00
金融	金融庁ホームページ	鈴木財務大臣兼内閣府特命担当大臣閣議後記者会見の概要（令和４年７月22日）を公表しました。	https://www.fsa.go.jp/common/conference/minister/2022b/20220722-1.html	内閣府特命担当大臣	2022-07-27 12:01:00
金融	金融庁ホームページ	鈴木財務大臣兼内閣府特命担当大臣閣議後記者会見の概要（令和４年７月19日）を公表しました。	https://www.fsa.go.jp/common/conference/minister/2022b/20220719-1.html	内閣府特命担当大臣	2022-07-27 12:00:00
ニュース	BBC News - Home	Euro 2022: Peak television audience of 9.3 million watched England thrash Sweden	https://www.bbc.co.uk/sport/football/62315695?at_medium=RSS&at_campaign=KARANGA	audience	2022-07-27 11:47:34
ニュース	BBC News - Home	Gas prices soar as Russia cuts German supply	https://www.bbc.co.uk/news/business-62318376?at_medium=RSS&at_campaign=KARANGA	capacity	2022-07-27 11:54:04
ニュース	BBC News - Home	Dolomites: British woman falls to death on hiking trip in Italy	https://www.bbc.co.uk/news/uk-62318908?at_medium=RSS&at_campaign=KARANGA	woman	2022-07-27 11:12:26
ニュース	BBC News - Home	Tory leadership: Do rivals' tax pledges add up?	https://www.bbc.co.uk/news/uk-politics-62122166?at_medium=RSS&at_campaign=KARANGA	pledges	2022-07-27 11:39:49
北海道	北海道新聞	道産野菜、新千歳から静岡へ　北海道コカ・コーラボトリングとフジドリームエアラインズ	https://www.hokkaido-np.co.jp/article/710875/	北海道コカ	2022-07-27 20:38:00
北海道	北海道新聞	スルメイカ　音にどう反応　函館の研究センター、飼育実験を公開	https://www.hokkaido-np.co.jp/article/710847/	飼育	2022-07-27 20:35:24
北海道	北海道新聞	夏の甲子園暑さ対策　朝夕「２部制」など検討へ	https://www.hokkaido-np.co.jp/article/710871/	夏の甲子園	2022-07-27 20:34:28
北海道	北海道新聞	逮捕後コロナ感染　勾留停止申し立てに応じず　名古屋地裁	https://www.hokkaido-np.co.jp/article/710874/	名古屋地裁	2022-07-27 20:32:00
北海道	北海道新聞	肥料高騰支援、対象拡大訴え　鈴木知事、自民、公明などに要請	https://www.hokkaido-np.co.jp/article/710837/	鈴木直道	2022-07-27 20:30:50
北海道	北海道新聞	高校生の修学旅行先、道内に変更相次ぐ　屋外でバーベキューも　延期や期間短縮、思い出づくりに腐心	https://www.hokkaido-np.co.jp/article/710865/	修学旅行	2022-07-27 20:19:27
北海道	北海道新聞	桜島警戒レベル３に引き下げ　「避難」から「入山規制」に	https://www.hokkaido-np.co.jp/article/710870/	入山規制	2022-07-27 20:19:00
北海道	北海道新聞	駐輪場に車突っ込み７歳男児死亡　運転の高齢男性も　鹿児島	https://www.hokkaido-np.co.jp/article/710869/	突っ込み	2022-07-27 20:18:00
北海道	北海道新聞	上川管内４６０人感染　旭川市は３１４人	https://www.hokkaido-np.co.jp/article/710734/	上川管内	2022-07-27 20:14:28
北海道	北海道新聞	北見商高柔道部、期待の７人入部　団体戦出場、強豪復活へ	https://www.hokkaido-np.co.jp/article/710840/	部員	2022-07-27 20:12:00
北海道	北海道新聞	佐々木朗、球宴最速１６２キロ　大谷に並ぶ	https://www.hokkaido-np.co.jp/article/710722/	球宴	2022-07-27 20:07:29
北海道	北海道新聞	五輪と気候変動、現代アートに　札幌の岡さん、ミュンヘンに作品　５０周年記念芸術祭	https://www.hokkaido-np.co.jp/article/710491/	気候変動	2022-07-27 20:04:32
北海道	北海道新聞	東京円、１３７円近辺	https://www.hokkaido-np.co.jp/article/710854/	東京外国為替市場	2022-07-27 20:01:00