Questions tagged [performance-monitoring]

Questions about monitoring server hardware and software performance, or network performance.

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598 votes
4 answers
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What exactly do the colors in htop status bars mean?

By default, htop shows colored status bars for processors, memory, and swap. From left to right, the bars are colored green, blue, yellow, and red depending on some thresholds. What does it mean when ...
tobym's user avatar
  • 6,431
74 votes
9 answers
149k views

How passively monitor for tcp packet loss? (Linux)

How can I passively monitor the packet loss on TCP connections to/from my machine? Basically, I'd like a tool that sits in the background and watches TCP ack/nak/re-transmits to generate a report on ...
nonot1's user avatar
  • 1,109
62 votes
10 answers
15k views

How to [politely?] tell software vendor they don't know what they're talking about

Not a technical question, but a valid one nonetheless. Scenario: HP ProLiant DL380 Gen 8 with 2 x 8-core Xeon E5-2667 CPUs and 256GB RAM running ESXi 5.5. Eight VMs for a given vendor's system. ...
Simon Catlin's user avatar
  • 5,232
37 votes
2 answers
24k views

How can I save the counters’ setup in windows performance monitor

I need a comprehensive and complex set of performance counters in windows performance monitor. At this point every time that I use performance monitor, I have to add the counters, one by one. Is there ...
Allan Xu's user avatar
  • 695
32 votes
6 answers
27k views

Measure total latency of SSH session

Is there a way to measure/report the overall latency in a tunneled SSH session? My particular setup is: Client (OS X + wifi router + ADSL modem) Gateway SSH server exposed to Internet Internal SSH ...
pufferfish's user avatar
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29 votes
5 answers
28k views

How to reset munin graphs

I'd like to reset all graphs for a certain host in Munin. Anyone who knows how I can do this?
Ztyx's user avatar
  • 1,405
28 votes
6 answers
5k views

Top-like tool for IP traffic [closed]

I need to keep watch on how much bandwidth some connections are taking in a server, and I know I have seen a top-like tool for that before. However, I can't remember the name of the tool, and I'm not ...
Daniel C. Sobral's user avatar
24 votes
2 answers
70k views

What is "a lot" of Page Faults?

I am monitoring the memory object in Windows 2k8, and am tracking the Page Faults/sec counter. Is there any threshold to determining what is an excessive amount of page faults? Or should I be more ...
MattUebel's user avatar
  • 937
20 votes
6 answers
10k views

Finegrained performance reporting on svchost.exe

This is something that's always bothered me, so I'll ask the Server Fault community. I love Process Explorer for keeping track of more than just the high-level tasks you get in the Task Manager. But ...
Randolpho's user avatar
  • 603
20 votes
4 answers
25k views

sar: enable data collecting

I've just installed the sysstat package on Manjaro. When running sar for the first time I see: Cannot open /var/log/sa/sa21: No such file or directory Please check if data collecting is enabled How ...
Tom Hale's user avatar
  • 1,155
20 votes
6 answers
67k views

Weird memory usage in Windows Server 2008 R2

I hope someone can help. We've got a Windows Server 2008 R2 machine with 16GB of RAM that keeps getting all its available memory eaten by something. Nothing in Task Manager or Resource Monitor reveals ...
Django Reinhardt's user avatar
18 votes
6 answers
15k views

Why the discrepancy between Speedtest and Wget?

My customer complains about low internet speeds. When measured with Speedtest.net speeds are acceptable. Periodic measured downloads are 10% to 30% of the nominal speed. I cannot explain that. Some ...
Johannes Linkels's user avatar
17 votes
3 answers
56k views

Measure Linux IOPS for a running system

How do I measure IOPS of a running Linux server? I know that the theoretical IOPS of a SATA drive is around 90 and enterprise 10k SAS/FC disk is 180. I want to know how much my running system is using ...
Rajkumar S's user avatar
17 votes
2 answers
10k views

What's difference between monitoring, tracing and profiling?

I have seen these three words showing up a lot, but don't understand the exact differences between them. For example, collecting CPU utilisation is often called profiling and can also fall into ...
Richard's user avatar
  • 279
15 votes
5 answers
56k views

Find out which task is generating a lot of context switches on linux

According to vmstat, my Linux server (2xCore2 Duo 2.5 GHz) is constantly doing around 20k context switches per second. # vmstat 3 procs -----------memory---------- ---swap-- -----io---- -system-- --...
grzaks's user avatar
  • 335
14 votes
4 answers
26k views

Monitor open process files on Linux in real-time

The files opened by a process can be found with this command: ls -l /proc/PID/fd Is there any way that can be done in a more interactive way like tail, auto-refreshing every x seconds?
Frankie's user avatar
  • 449
14 votes
13 answers
33k views

Simple tool to graph memory usage?

Is there a script that will show memory usage as a graph, for example as a pie-chart, with each process being being a separate slice? I'm not looking for something like Munin to graph memory usage ...
dbr's user avatar
  • 1,578
14 votes
2 answers
31k views

NFS I/O monitoring

I have a NFS mounted directory, and I'd like to monitor the I/O usage on it (MB/s reads and writes). What's the recommended way to do that ? This is the NFS client, I don't have access to the NFS ...
Gordon's user avatar
  • 155
14 votes
5 answers
18k views

What is the closest equivalent of "load average" in Windows available via WMI?

Linux has a notion of Load Average which is defined as: System load averages is the average number of processes that are either in a runnable or uninterruptable state. A process in a runnable state ...
leonigmig's user avatar
  • 327
14 votes
16 answers
13k views

Real time monitoring of MS Windows servers and their services

We have a bunch of large HDTVs in our monitoring office keeping an eye on all of our production equipment. We are monitoring: Cisco routers HP switches HP proliant servers Windows 2003 IIS SQL ...
Mike McClelland's user avatar
13 votes
4 answers
29k views

Is it possible to filter top to show specific processes?

I'm run top and I want to always see java/tomcat/redis/mysql/mongo, is that possible?
Blankman's user avatar
  • 2,901
13 votes
5 answers
21k views

Determining VM doing I/O on a Hyper-V host

How do I find out which VM is responsible for the majority of the I/O I see with Hyper-V? The situation: I do have Hyper-V hosts with a number of VMs (around 30 per host) where I occasionally see ...
the-wabbit's user avatar
12 votes
9 answers
36k views

A simple option for graphing CPU usage on a remote Linux Server

My requirements are very simple. I need to graph the CPU usage on a remote Linux server. I'm not looking for anything complicated, I just need to be able to plot the CPU usage on a Linux server over a ...
Bart B's user avatar
  • 3,507
11 votes
5 answers
21k views

How to measure req/sec by analyzing apache logs

I want to measure the justify stress-test result on production env. How to measure req/sec by analyzing apache logs? apache2.2 LogFormat "%v:%p %h %l %u %t \"%r\" %>s %O \"%{Referer}i\" \"%{...
freddiefujiwra's user avatar
11 votes
2 answers
30k views

How to see disk usage graph on Windows Server 2012

I experience a huge slow-down on server. And the more I inspect, the less I find out what's going on wrong there. I think it might be related to I/O. On local PC, I can open Task Manager, and see the ...
Saeed Neamati's user avatar
11 votes
6 answers
1k views

Accurately trending random I/O performance for capacity planning

Where I work we have a numerous "big iron" servers which are used used for hosting many virtual machines using a Xen Hypervisor. These are typically configured with 32GB RAM, Dual Quad core processes ...
Keiran Holloway's user avatar
11 votes
2 answers
9k views

How would you interpret the following vmstat output?

Consider the following five machines (named c, h, j, s and u) and their respective vmstat 1 outputs. Given the information from the vmstat output: Which machines would you consider being in a good ...
knorv's user avatar
  • 1,819
11 votes
2 answers
2k views

How do you monitor the performance of a character device (e.g. tape drive)?

There are many ways to monitor block device performance: dstat and iostat, heck, even sar will give you data on block device I/O rates. Unfortunately, I don't know of any good spur-of-the-moment ...
Slartibartfast's user avatar
10 votes
1 answer
25k views

How to save a perfmon Performance Counter as a textfile (Reliability and Performance Monitor Version 6.0)

Now the file gets saved as blg, but I would like a txt version to import in Excel.
Lieven Cardoen's user avatar
9 votes
2 answers
10k views

htop Memory meter is full. I haven't even started any service yet

I don't understand why my htop meter is full already. I'm not even running some task. Here's the screenshot of my htop: The green meter shows used memory, the blue meter shows buffers, the yellow ...
Raymond's user avatar
  • 215
9 votes
7 answers
7k views

Best tool for monitoring backups, etc. and trending statstics from that data [closed]

I have done some research on nagios, opennms, and zenoss but am not confident that I have found what I am looking for. The main driving force for me right now is being able to monitor backups. This ...
Randy Syring's user avatar
9 votes
1 answer
202 views

Windows / NTFS - is it possible to measure completion time of file operations?

I'm looking for possibility of measuring how much time it takes to finish file operation issued to NTFS driver (open file close file delete file, write, read etc) and to be able to log it. I can't ...
Mariusz Zieliński's user avatar
8 votes
6 answers
4k views

At what point is a server considered idle?

Conceptually, what is the definition of an idle server? What resource metrics would you look at to make an assumption on whether or not a server was idle? Would you look at: CPU utilization Disk ...
Johnrad's user avatar
  • 203
8 votes
7 answers
6k views

Nagios Check that Simulates Web Full Rendering Time

Does anyone know of a Nagios plugin or cli program that can simulate the load time of a webpage as it would be in a browser. For example the resulting total load time of something like Pingdom's Full ...
Kyle Brandt's user avatar
  • 84.3k
8 votes
5 answers
7k views

How to fine-tune our MySQL server?

MySQL is not my thing, yet I need to fine-tune one of our servers. Here are the requirements/specs: The MySQL server has only one significant database We only have one "type" of application ...
Julien Genestoux's user avatar
8 votes
2 answers
4k views

how does NewRelic work by simply installing .Net agent?

Yesterday, I decided to give NewRelic a try. I signed up for a free account, and installed the .Net agent, and restarted IIS as instructed. Immediately, this agent started showing up a wealth of ...
Karl Cassar's user avatar
8 votes
1 answer
3k views

Disk Queue length of 30 in Azure App Service, that can't be right

We are having a battle with the Microsoft Azure support team. I hope the Serverfault community can chime in as the support team has messed us about before. Here is what is happening. As part of a ...
Jeroen Ritmeijer's user avatar
8 votes
1 answer
2k views

How to record and replay htop?

TL;DR Is there an option to run htop in a way that will generate some report and the load it using htop later? Similar to perf record and perf report. I'm a big fan of htop. I use it quite a lot when ...
kfir's user avatar
  • 111
8 votes
1 answer
2k views

How do I get an aggregate of all the stats from all uWSGI vassals using uwsgitop?

TL;DR Can anyone tell me how I may get uwsgitop to monitor all of my vassals in my emperor-vassal setup in one shot? I have an emperor-vassal setup for my uWSGI server, and I need to monitor all my ...
Anish Ramaswamy's user avatar
8 votes
0 answers
4k views

Use perfmon to monitor a specific ASP.NET webapp across worker process restarts, IIS restarts, etc.?

I have a few perfmon performance counters that I'd like to track for a specific ASP.NET application over an extended period of time, say a week or a month. The trouble is that perfmon counters are ...
Chris's user avatar
  • 1,073
7 votes
9 answers
9k views

Linux: How to find out whether the harddrive is causing a bottleneck?

I'm not asking how to find out where a bottleneck is. I just what to know how to check if the harddrive is being used at its limit (and hence causing a bottleneck). Something like top where I can see ...
GetFree's user avatar
  • 1,530
7 votes
11 answers
4k views

Is there tool that will monitor or log speed of web server responses [closed]

I have GNU/linux Box (linode VPS running Debian) with PHP, Apache, MySQL and Varnish (and app/site that use those) is there a tool that will save or monitor load times of web server responses?
jcubic's user avatar
  • 250
7 votes
9 answers
6k views

Linux Server Performance Monitoring

I'm looking to monitor performance on my Linux servers (which happen to be Centos). What are the best tools for monitoring things in realtime such as: Disk Performance I/O, swapping etc.. CPU ...
Jonathan Holloway's user avatar
7 votes
4 answers
11k views

Gigabit ethernet generally faster than Firewire 800?

If I want to transfer a large file between two computers, which are connected via LAN, would going through the network (setup as gigabit ethernet) be faster than using a direct Firewire 800 connection ...
hpy's user avatar
  • 865
7 votes
4 answers
11k views

Graphing per-user CPU usage on a Linux machine

I want to graph (graphical output would be great, i.e. a .png file) the following situation: I have users A, B, and C. I limit their resources so that when all users run a CPU intensive task at the ...
mart1n's user avatar
  • 173
7 votes
2 answers
3k views

What is the (*) in Windows Performance Counters

Take the following counter for example: \LogicalDisk(*)\% Free Space Where can I find what can be plugged in place of the *? I know sometimes it's _global_ and other times it can be _total_. I ...
Paul Fleming's user avatar
7 votes
1 answer
2k views

BUG CONFIRMED: No performance data for VMXNET3 in ESXi 6.0?

Did ESXi 6.0 completely removed the performance data for VMXNET3 or is there is a way, how can enable throughput logging/graphing for VMXNET3? In ESXi 5.5 the ESXi client showed the network ...
mvorisek's user avatar
  • 575
7 votes
3 answers
15k views

Network bandwidth usage per process Windows Server 2003

Is there freely available analog from Microsoft to monitor network bandwidth usage per process on Windows Server 2003 as this is implemented with Resource Monitor on W2k8? What I need to know is how ...
Volodymyr Molodets's user avatar
7 votes
2 answers
19k views

Page load long stall times. What is this? [closed]

I have been studying the performance of a website I am building, and notice a curious thing that I can't find the answer to: two requests (always the same two) mysteriously have prolonged stalled ...
Krii's user avatar
  • 131
6 votes
2 answers
2k views

How to compare mainframe CPU performance?

I am working with an application that runs on tomcat in OMVS. It run terribly on one mainframe, and adequately another another. Is there a way I can compare the CPU of the two mainframes as a ...
GC_'s user avatar
  • 211

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