- What does a long queue length indicate?
- What is disk queue depth?
- How do I check my IOPS?
- Why is IIS so slow?
- What does the Processor Queue Length counter measure?
- What disk queue length is too high?
- What is normal disk queue length?
- What is queue length?
- What is disk idle time?
- What is a good disk response time?
- How do I see disk queue length?
- What is disk queue length SQL Server?
- What can you conclude if a Windows process is constantly reading and writing to the hard drive?
- How do I check Iostat?
- How do you read Iostat output?
- How do you monitor database performance?
- How do I measure IIS performance?
- What is IIS queue length?
- How much free space does a hard drive need to prevent a performance slowdown?
- What is disk time in Performance Monitor?
- Which tool can you use to gather and display statistics that help you monitor?
- How do I view IIS queue?
- How do I see run queue in Linux?
- How do I find disk queue length in Linux?
What does a long queue length indicate?
If the processor queue length exceeds the value recommended above, it generally indicates that there are more threads than the current processor can service in an optimal way..
What is disk queue depth?
Disk Queue Depth is the number of outstanding IO requests that are waiting to be performed on a disk. Blue Matador monitors the Data Disk Queue Depth and OS Disk Queue Depth metrics to monitor the queue depth of your Data and OS managed disks for Azure Virtual Machines.
How do I check my IOPS?
To calculate the IOPS range, use this formula: Average IOPS: Divide 1 by the sum of the average latency in ms and the average seek time in ms (1 / (average latency in ms + average seek time in ms). Sample drive: Model: Western Digital VelociRaptor 2.5″ SATA hard drive. Rotational speed: 10,000 RPM.
Why is IIS so slow?
An IIS or ASP.NET hang can cause your website to have slow page loads, timeouts, or 503 Service Unavailable errors. Hangs can be caused by blocked ASP.NET threads, bad configuration, or request queueing.
What does the Processor Queue Length counter measure?
What does the Processor Queue Length counter measure? It measures the number of execution threads waiting for access to a CPU.
What disk queue length is too high?
Disk latency above 25 ms can cause noticeable performance issues. Latency above 50 ms is indicative of extremely underperforming storage. Disk queues should be no greater twice than the number of physical disks serving the drive.
What is normal disk queue length?
A good rule of thumb is that there should never be more than half the number of spindles in the queue length. If you have a 10-disk RAID volume, the queue length should be less than 5.
What is queue length?
The Processor Queue Length is the number of threads that are ready but currently unable to run on the processor due to another active thread. A bottleneck on the processor may be thought to occur where the number of threads in the queue is more than 2 times the number of processor cores over a continuous period.
What is disk idle time?
As per the perfmon definition. % Idle Time. This counter provides a very precise measurement of how much time the disk remained in idle state, meaning all the requests from the operating system to the disk have been completed and there is zero pending requests.
What is a good disk response time?
“Response Time (ms). Disk response time in milliseconds. For this metric, a lower number is definitely better; in general, anything less than 10 ms is considered good performance.
How do I see disk queue length?
Use the following formula to find the Avg. Disk Queue Time: Avg. Queue Time = Disk Queue Length x Avg. Disk sec/Transfer.
What is disk queue length SQL Server?
Disk Queue Length counter shows you the average number of read and write requests that were queued on the selected physical disk. The higher the number the more disk operations are waiting. It requires attention if this value frequently exceeds a value of 2 during peak usage of SQL Server.
What can you conclude if a Windows process is constantly reading and writing to the hard drive?
What can you conclude if a Windows process is constantly reading and writing to the hard drive? Answer: The hard drive is thrashing, indicating memory is low.
How do I check Iostat?
The command to display only a specific device is iostat -p DEVICE (Where DEVICE is the name of the drive–such as sda or sdb). You can combine that option with the -m option, as in iostat -m -p sdb, to display the statistics of a single drive in a more readable format (Figure C). Easy to read stats for a single device.
How do you read Iostat output?
To interpret the output of iostat, you need to know a little performance terminology:Throughput is the rate at which a system completes operations, in units of operations per second.Concurrency is the number of operations in progress at a time, either as an instantaneous measure or an average over an interval of time.More items…•Jan 9, 2010
How do you monitor database performance?
Five Best Practices for Proactive Database Performance MonitoringMonitor Availability and Resource Consumption. This first step of proactive monitoring is to check whether all databases are online at regular intervals. … Measure and Compare Throughput. … Monitor Expensive Queries. … Track Database Changes. … Monitor Logs.Feb 1, 2019
How do I measure IIS performance?
Use Task Manager. Task Manager is a great tool for getting all the insights related to IIS. You can monitor CPU and memory usage of inetinfo.exe and w3wp.exe to monitor the IIS services. It enables you to identify major problems, including memory leak that hampers the web server’s performance.
What is IIS queue length?
Answer 1: Appilcation Pool Default Settings -> Queue Length: sys how many requests to queue for an application pool before rejecting future requests. When the value set for this property is exceeded, IIS rejects subsequent requests with a 503 error.
How much free space does a hard drive need to prevent a performance slowdown?
The 15% Rule of Thumb for Mechanical Hard Drives You’ll commonly see a recommendation that you should leave 15% to 20% of a drive empty. That’s because, traditionally, you needed at least 15% free space on a drive so Windows could defragment it.
What is disk time in Performance Monitor?
The disk performance counters time the responses by using a 100 nanosecond precision counter, and then report the cumulative statistics for a given sample time. This sample time could go over 100 percent if, for example, you have 10 requests that completed in 2 milliseconds each in a 10 millisecond sampling interval.
Which tool can you use to gather and display statistics that help you monitor?
Performance MonitorExplanationPerformance MonitorExplanationPerformance Monitor gathers and displays statistics that help you monitor the operation of aWindows system. Statistics gathered include items such as memory and CPU use, diskthroughput and network utilization.
How do I view IIS queue?
In order to monitor performance counters: Go to Start. Search for “Performance Monitor“ Click on the green plus sign (+) at the top of the window.
How do I see run queue in Linux?
2 Answers. Start with top. It should list all or most of the run queue in the first page. Also ‘ps r -A’ will list all processes in the run queue.
How do I find disk queue length in Linux?
You can see the average queue size in the aqu-sz column (in previous versions avgqu-sz ). Consider the following example output from iostat -xmt 1 which shows a full IO queue (max queue length is 128 for this device) and a saturated disk during a benchmark.