monitoring

问题 Background We used Laravel Queues on top of beanstalkd on two ec2 instances (behind a load balancer). As the system scaled we decided to use redis instead of beanstalkd, and host it on an AWS elastic cache instance (with a cluster of a master node and two replicas). With beanstalkd, I used beanstalk utilities to monitor the health of the queue; for example if the queue was getting clogged, I could easily see that by running a command like this: ./beanstalk-queue-stats.rb localhost:11300 Which

问题 I hear that the System.out.println(); Java statement is costly (it consumes a lot of time) So I try to evaluate its cost: When I evaluate 5 statements... The cost = 1.0 So I expect the cost of 1 statement = 0.2 But actually I found The cost = 0.0 !! double t1 = 0; double t2 = 0; t1 = System.currentTimeMillis(); System.out.println("aa"); System.out.println("aa"); System.out.println("aa"); System.out.println("aa"); System.out.println("aa"); t2 = System.currentTimeMillis(); System.out.println(

问题 What I'd like I'd like to have an internal web app in PHP where I can look at all my errors, logs, etc., from all my apps and sites. Let me paint a picture to explain: I'd like to go to something like monitor.thecompany.com and I will see that there was an error uploading a file on client1.com and that a new user was registered at client2.com. Internals I imagine that I would call a function in my apps and sites (something like send_to_monitor($type, $title, $description) ), which would send

问题 What I'd like I'd like to have an internal web app in PHP where I can look at all my errors, logs, etc., from all my apps and sites. Let me paint a picture to explain: I'd like to go to something like monitor.thecompany.com and I will see that there was an error uploading a file on client1.com and that a new user was registered at client2.com. Internals I imagine that I would call a function in my apps and sites (something like send_to_monitor($type, $title, $description) ), which would send

问题 In thread related Mbeans of Tomcat I see under Catalina.ThreadPool. there are different attributes viz. maxThreads, currentThreadCount, currentThreadsBusy etc. So, where can I get the description of these Mbean attributes, what each of these attribute is indicating, I need to include this in my monitoring automation code, Which will provide the Thread utilization stats. also possible I would like to see the Source code, where can I get it? When I see the Mbean class name (through jconsole) it

问题 I am new to SQL Server. I need to monitor TableData Changes in database. I am using 2012 version SQL Server Management Studio. If any insertions, deletions, modifications are done in SQL stored procedure, I need to send the stored procedure output result as parameter from SQL Server to a web service. For Table Data monitoring, I am referred several articles from internet. I am found several concepts while searching in Google. I need to know, which concept is more effective for coding and very

问题 I would like to have a HashMap<String, String> , that every day at midnight, the cache will expire. Please note that it's J2EE solution so multiple threads can access it. What is the best way to implement it in Java? 回答1: Although the other suggestions can work to time the expiration, it is important to note that : Expiration of the hashmap can be done lazily i.e. without any monitor threads ! The simplest way to implement expiration is thus as follows : 1) Extend hash map , and create a

问题 I need to writing a delphi program which will monitor a folder for changes (Add, update, rename and removal of files). Is the TShellChangeNotifier is way to go? To be honest, I have no idea how to use it. Please help. Thanks. 回答1: This question might help. mghie's answer shows how to properly use ReadDirectoryChangesW . 回答2: I think this article will help you: Monitoring System Shell Changes using Delphi Basically it analyzes the TShellChangeNotifier, discards it and then goes for a

问题 I need to writing a delphi program which will monitor a folder for changes (Add, update, rename and removal of files). Is the TShellChangeNotifier is way to go? To be honest, I have no idea how to use it. Please help. Thanks. 回答1: This question might help. mghie's answer shows how to properly use ReadDirectoryChangesW . 回答2: I think this article will help you: Monitoring System Shell Changes using Delphi Basically it analyzes the TShellChangeNotifier, discards it and then goes for a

问题 I am trying to see the number of active puma threads on my server. I can not see it through ps : $ ps aux | grep puma healthd 2623 0.0 1.8 683168 37700 ? Ssl May02 5:38 puma 2.11.1 (tcp://127.0.0.1:22221) [healthd] root 8029 0.0 0.1 110460 2184 pts/0 S+ 06:34 0:00 grep --color=auto puma root 18084 0.0 0.1 56836 2664 ? Ss May05 0:00 su -s /bin/bash -c puma -C /opt/elasticbeanstalk/support/conf/pumaconf.rb webapp webapp 18113 0.0 0.8 83280 17324 ? Ssl May05 0:04 puma 2.16.0 (unix:///var/run