I work on a large C++ application and often get the opportunity to continue this while at home. The IBM MQ configuration is using some kind of domain group for authentication so the application won't run unless I'm connected to the office VPN via Secure Client.
Why does the application run so much slower when connected to the VPN than in the office?
As background info, I should state the application also needs a database (Oracle) etc but all of this is locally hosted, so shouldn't be affected by the change in location.
I'm using a local MQ server as well, in case that wasn't clear. Essentially, beyond the MQ domain authentication (which is at the start of the process as far as I can tell), application behaviour is dramatically reduced. A process which takes 30 minutes in the office takes >2hrs at home. I have noticed the filesystem is generally slower (although this is a SSD drive laptop). Could Clearcase / Sophos be conflicting?
Is there a 'good way' I can monitor windows to see what exactly, if anything, is slowing the machine down out of the office?
If I get to May with no useful responses I think I'll nuke this message. FYI, I tried server overflow as well but to no avail (they complained and said the question should live on stackoverflow instead!)
Well, if your internet speed is not very fast then that would explain the issue.
Related
I've noticed on my dev env. timeout sql connection errors when i'm using connection string to remote db.
I've developed a small tool to ping domain and db server based on these answers test if a website is alive from a C# applicaiton
and test SQL Server connection programmatically
When i noticed Failed pings i looked into site management console and caught that Sql Server is unavailable, the site was down for about 5 minutes.
Since i started monitoring the issue repeated 3 times for the last couple of days. It means that my DB server withing a shared hosting plan is not reliable 24/7, i opened a ticket and got a reply from support:
As this is a shared server, the activities on the server always varies from time to time. We apologize if there is a slight issue earlier
Is this a common situation for any shared asp.net hosting? or it is a bad luck and i need to search for another hosting?
Sometimes when the hosting providers update some service or software it could be down for a few minutes, but this should not happen very often. You could continue monitor the services and if the results are not good you could try another hosting provider.
You may experience little slowness or lagging in I/O in shared database servers while database backup script is running in background or any other maintenance are carried out by the web host. But in most cases, they don't affect the server availability.
In fact, shared database servers are really high end servers (mostly SSD base) and are meant to host thousands of databases without single hiccup. They must be capable to handle millions of queries at any point of time. If you face this problem more often then it's straight indication that your web host is overly utilizing the database server resources, or server is no longer capable to handle the load in peak hours.
I hope someone can help me figure out this issue.
I have a windows based VPS with 6GB of ram and enough disk space.
I have only 3 websites hosted and all three are not advertised publicly, so no one could access.
The issue is the server is slow in response whenever we try to load the sites in browser or in RDP or thru Parallel Plesk Control. Everything slow to response.
I have every 1 minute to 3 , from green zone to red zone a lot of numsessions limit hits.
I have browsed SO and read Parallel doc and even browse their forum and no one has mentioned a real solution. They say that numsessions is hit when many sessions of rdp or Parallel Plesk Control are left open.In my case no one has access to the server and no one is logging to the server either. I have rebooted the server many times and only one session was open and that was to control server via virtuoso (Parallel Power Control) and same the numsessions is hit again within 3 min of reboot.
I have talk to the idiots at 1and1 (where we bought the VPS xxl) and they have no clue saying it is not our problem but yours or MS Windows! I have not installed any third party or even proprietary software on server which could cause the issue. The server is brand new and only created new sites via Parallel Plesk control. Emails are not working either.
Windows Event viewer doesnt show much information either.
Last resort is to re-image the server which may solve issue but I doubt since the issue seems to be from the server when we bought it.
anyone could shed their wisdom light on this please?
Thanks
Just noticed my resource log full of these as well. I think the issue is that a session is counted as soon as a RDP connection is made - so bots trying common admin passwords count towards this.
The real issue is as there is no way I can find to filter these from the resource alerts you basically can't find the real problem you have as the logs are just full of numsesssions.
Apart from Technology support , what are all the business benefits for oracle web logic server. For example in area of security,support etc.
What are all the new features supported by weblogic ?
TL;DR:
Support is great when you open ticket with Oracle Support (Weblogic strictly).
Great admin/read-only user implementation. We authenticate to Windows Active Directory. Developers get read-only accounts, reduces churn for them to wait for ops to transfer logs and validate settings.
Dashboard useful out-of-box to do real-time monitoring without additional tools or installs. Easily accessed by any one who is authenticated to login. We could give it to our CIO if he wanted in about 3 minutes by adding him to the right authorized group in AD.
Easier to clone environments.
I haven't worked with OC4J but I believe Oracle's roadmap is picking Weblogic as their preferred Java application server. You can see it is the base technology for some of their other products, such as Oracle Service Bus, Oracle Enterprise Manager (OEM), and Oracle Line Planning.
I have opened 3 Oracle tickets in the past month. I was surprised at how fast they answered. For a Severity 3 ticket (medium), they usually have responded in 2-3 days. I can't say the same for their other services (over 2 weeks for a ticket on OEM).
Security is a pretty broad scope... so you'd have to be a little more specific on some of the topics of security.
One thing that is pretty awesome is the Dashboard. http://docs.oracle.com/cd/E14571_01/web.1111/e13714/dashboard.htm You can obviously add read-only monitor accounts so other users can get insight to the performance. We add developers to this so that they can validate any settings, or see performance whenever there is a production issue.
We used Microsoft Active Directory authentication in our Weblogic domains. People are not using the default weblogic administrator user so configuration changes are audited. When someone's account gets disabled when leaving the company, it disables their access to Weblogic similarly. You don't have to change the password.
Other useful settings I like in it is the ability to automatically archive config changes. Each time someone makes a config change, a backup is automatically created. This allows me to go fix something when developers break their environment without having to majorly reverse-engineer what they did.
I also like the fact that you can pack and unpack the domains. I've used it to move entire domains from staging to production with some minor changes... i.e. change all stg to prod variables. This should likewise make it easier to 'clone' environments when you want to build out a new one.
Although not related, I should mention Oracle Enterprise Manager. We are an Oracle shop because they seem to have given us a good deal on licencing. So we get to run Oracle Enterprise Manager, which is a tool slowly becoming more and more useful. The agent also reports how our RedHat Linux hosts are behaving, network input/output, CPU utilization, memory utilization, java heap stacks. We are going to move to defining groups within that has all the targets related to an application stack. This will give our operations team the insight to see where the bottleneck might be... the Oracle Weblogic web layer, network, Oracle Service Bus, or Oracle Database performance.
Supposedly, you can add jBoss, other JMX monitoring as well to OEM. It's on our to-do list for non-Weblogic instance. We're slowly rolling OEM out.
I have a rather strange scenario. We have a range of WEBAPIs hosted on the cloud. We consume those services in our Windows 8 application. The problem is when the services are running locally it takes less than 400ms but when hosted on Windows azure it takes upto 20 seconds for some requests. I have checked the indexes of our database tables and its fine. I have no clue so as to what to profile and how to improve the performance.
Thanks!
Everyone Thanks a lot!
But I found a way to use dottrace(Excellent profiling tool) on the azure deployment. Here is the link
http://blog.maartenballiauw.be/post/2013/03/13/Remote-profiling-Windows-Azure-Cloud-Services-with-dotTrace.aspx
You can also use windows azure diagnostics and stopwatch class to log all times to the wad tables.
Also found out that the first request to the azure service is always slow in another thread. Have just copied it here below
Serkan, you would need to first make sure in your post, weather you have published a Cloud Service or a Website to Windows Azure. Based on Cloud Service (A Web Role) or a WebSite the answer to your question will be different. As you want to learn more I would explain what goes on behind.
As you suggested that your first connection is slow, I can see that happen with Windows Azure Websites. Windows Azure Websites are running in shared pool of resources and uses the concept of hot (active) and cold (inactive) sites in which if a websites has no active connection for x amount of time, the site goes into cold state means the host IIS process exits. When a new connection is made to that websites it takes a few seconds to get the site ready and working. Depend on how your first page code is, the time to load the site for the first time varies. Similar discussion is logged: Very slow opening MySQL connection using MySQL Connector for .net
With Windows Azure Cloud Service the overall application model is different. Your webrole has its own IIS server which is fully dedicated to your application and above Website limitation does not occur however there could be other reasons which could have slower page load. If you are using WebRole, then what you could do is run a page load profiler first and RD to your Azure Instance to collect the page load data to see what else you could do to boost the performance.
You'll obviously need to profile your app to find the real cause. Check out these two articles which should get you started:
http://msdn.microsoft.com/en-us/library/windowsazure/hh369930.aspx
http://www.windowsazure.com/en-us/develop/net/common-tasks/profiling-in-visual-studio/
Sometimes when I access my windows azure website, the initial response time is very slow. After the first page load the website is fast. Some background: The website is not that often visited at the moment. Further, I am using a keepalivecontroller to keep the website running and the website is running in shared mode. I am wondering: are websites that are not that active removed from memory in windows azure? Or is it just that background tasks on the operational level of windows azure are interfering sometimes? It is not transparent for me what is happening, so is there some sla of something for windows azure websites?
There is now a new feature available for Windows Azure Websites in 'Reserved' mode that will keep your website warm. You can now turn on "Always-on" under the "Configuration"-tab on your Azure Website. As explained in this blog post:
When the new “Always On” feature is is enabled on a site, “Windows
Azure will automatically ping your website regularly to ensure that
the website is always active and in a warm/running state,” Guthrie
writes. “This is useful to ensure that a site is always responsive
(and that the app domain or worker process has not paged out due to
lack of external HTTP requests).”
Easiest way to keep a website warm is to call it regularly using the Scheduler feature in Windows Azure Mobile Services.
You simply write a script in the Scheduler that pings your website every x minutes.
Here's a post covering how to do that: http://fabriccontroller.net/blog/posts/job-scheduling-in-windows-azure/
The Windows Azure Web Sites are still in preview, so there is currently no SLA with that service.
The Web Sites do idle out when in free or in Shared mode, which is likely what you are seeing. When the site idles out it actually is removed from memory, and indeed the IIS process host running the site is shut down. This is how they can get the density of hosting 100 sites on the same VM.
You can find a lot of info on the Channel9 site about why this is the case, or, as a shameless plug, here is an article that talks about how the process is handled.
Now, you mentioned that you were using a keepalivecontroller, but what exactly do you mean by that? I use pingdom.com to contantly request data for one of my websites, and that seems to do pretty well. It is still possible that a request doesn't come in and the idle time is met which then cycles the site. It is also possible that even if you always have the site running that the VM the site sites on needs to have the underlying OS updated, in which case Azure would then move the site process to another VM, which could also cause the slow start up on the next request.
I'd start logging your application start ups and then look through your logs to see how often that is happening.
If you only need to warm it up once (vs keeping it warm) and are mostly trying to prevent your customers experience page cold starts, I believe the correct tool is IIS Application Initialization. You can configure it with a list of urls to hit before it deems the app ready for action.
My site is suffering from page cold starts and that is severely magnified in Azure Websites (even on an S3), but it is absolutely speedy after its served that first time thanks to several layers of caching (our inefficient use of Umbraco's dynamic nodes query language creates a lot of database churn--which we're cleaning up opportunistically).
From what I've read and my own web.config attempts this is still not available in Azure Websites. I've asked Microsoft for it here: MS IDEA: Application Initialization to warm up specific pages when app pool starts. Please consider voting for it.
For each service/site you need to go to "Configure", then switch "Always On" to ON. Also make sure you click Save; it took my website about 2 minutes before noticing the change.
Why this is not the default is kind of mind boggling, because my setup on HostGator was running much faster than Azure. I guess Microsoft is figuring if nobody is accessing your site, it's okay if it has a long load time.