Unity slow?

[pier]

I noticed that Unity seems slow today. Even ssh-ing goes s-l-o-w.
I tried some other accounts on six and hugo, and they responsed quickly. Also websites had notable delay when accessing?

Checking load reveales nothing special :(

Is it just me and am I paranoid, or might there be something wrong ?

Pier
[ Noticed btw. that 'who' is working. Wasn't this disabled sometime ago ? But I see <some account> has been logged in everywhere :) ]

[Melissa]

Hi Pier,

All servers including UNITY have been fully operational today.

You may wish to view http://www.aota.net/Server_Performance/sitedown.php4 for tips on what to do when you experience problems. The above tutorial shows you ways to determine where the problem may be, and should always be your first step when you encounter problems.

Several of us in different locations have visited your site and are not any slowness, so this may be a local problem in nature. Running a traceroute may help to provide some answers for you.

Hope this helps,
Melissa

PS: 'who' is available now, as you've have seen. And, that would be Terra you'd be seeing as logged in "everywhere". ;)

[pier]

That's the strangest part,. I did a tracert to several servers, and evrything showed up correctly :(
It's just I noticed delay's in ssh-response (tab for filenamecompl... wait... wait. Aha)

But I guess it must just be me :\

Tnx,
Pier

[Terra]

Ok Pier,
It's just I noticed delay's in ssh-response (tab for filenamecompl... wait... wait. Aha)
That has nothing to do with either:
a) Networking
b) OpenSSH in general

it has to do with the server's filesystem (I/O) and is pretty much tightly scoped to the 'tab-completion' ability of the shell... :\

Depending on which directory you were doing the tab-completion, it could take a few moments depending on the size and/or what you are trying to complete...

POST #1: I noticed that Unity seems slow today. Even ssh-ing goes s-l-o-w.
!=
POST #2: It's just I noticed delay's in ssh-response (tab for filenamecompl... wait... wait. Aha)

Please zero in on the details, as I've just spent time digging through the server's network layers and there was no correlation to your initial claim above as portrayed in post #1...

1) Is there a slowdown with all command line commands?
2) Is HTTP slow?
3) Is POP slow?
4) Is FTP slow?
5) Are you still sure that this is a Network issue?

--
Terra
--chasing phantoms--
FutureQuest

[pier]

Oops, seems I should explain it better. Here we go:

As stated before, Unity seems slow to me, don't know about network.
tracert to six, hugo and unity (as I have accounts overthere) showed no slowdowns.

Just opened ssh-sessions to both six, hugo and unity. While prompt appears within 1 second on six & hugo, unity takes upto 3 to 4 seconds.

After doing quick commandline test (cd www; ls; cd ~; ls) looks like unity is just a fraction slower. While other have performed cd and show new prompt before I can enter ls, unity is still is cd-ing when I type ls.

HTTP-retrieval seems also just a bit slower, but noticable.

Strangest thing is, POP also failed for me a couple of times today only for my accounts on unity. However, it seems to me that I would connect to an underlying popserver, not to the servers itself ? Right as I'm typing this I'm getting errors on my unity pop-accounts.

Hope this helps,
Pier
[ Trying not to let phantoms out ]

[Terra]

Pier:
I cannot duplicate what you are seeing... My interactive session is crisp and clean on UNITY with no noticeable lag whatsoever... I have even logged in fresh, as your username, and gone through the motions with no slowdown at all...

You may want to check your compression settings for your OpenSSH connection, and possibly throw the '-v' switch to better see what is going on...

UNITY has had nothing but smooth low loads with nothing that particularly stands out...

I'm currently running some tests, I'll release the raw data shortly...

--
Terra
--Toyota--
FutureQuest

[Terra]

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[Terra]

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69::Sun Jul 14 17:11:29 EDT 2002

real 0m5.780s
user 0m2.500s
sys 0m2.500s

70::Sun Jul 14 17:11:36 EDT 2002

real 0m5.556s
user 0m2.620s
sys 0m2.430s

71::Sun Jul 14 17:11:43 EDT 2002

real 0m6.916s
user 0m2.630s
sys 0m2.410s

72::Sun Jul 14 17:11:50 EDT 2002

real 0m7.010s
user 0m2.660s
sys 0m2.340s

73::Sun Jul 14 17:11:58 EDT 2002

real 0m5.718s
user 0m2.670s
sys 0m2.370s

74::Sun Jul 14 17:12:05 EDT 2002

real 0m5.748s
user 0m2.540s
sys 0m2.450s

75::Sun Jul 14 17:12:11 EDT 2002

real 0m5.611s
user 0m2.500s
sys 0m2.520s

76::Sun Jul 14 17:12:18 EDT 2002

real 0m5.735s
user 0m2.080s
sys 0m2.970s

77::Sun Jul 14 17:12:25 EDT 2002

real 0m5.598s
user 0m2.480s
sys 0m2.570s

78::Sun Jul 14 17:12:31 EDT 2002

real 0m5.778s
user 0m2.260s
sys 0m2.720s

79::Sun Jul 14 17:12:38 EDT 2002

real 0m5.367s
user 0m2.870s
sys 0m2.130s

80::Sun Jul 14 17:12:44 EDT 2002

real 0m6.752s
user 0m2.530s
sys 0m2.520s

81::Sun Jul 14 17:12:52 EDT 2002

real 0m5.704s
user 0m2.230s
sys 0m2.910s

82::Sun Jul 14 17:12:59 EDT 2002

real 0m5.672s
user 0m2.500s
sys 0m2.580s

83::Sun Jul 14 17:13:06 EDT 2002

real 0m5.551s
user 0m2.820s
sys 0m2.240s

84::Sun Jul 14 17:13:12 EDT 2002

real 0m7.904s
user 0m2.850s
sys 0m2.360s

85::Sun Jul 14 17:13:21 EDT 2002

real 0m5.782s
user 0m2.740s
sys 0m2.250s

86::Sun Jul 14 17:13:28 EDT 2002

real 0m6.365s
user 0m2.470s
sys 0m2.630s

87::Sun Jul 14 17:13:35 EDT 2002

real 0m6.245s
user 0m2.450s
sys 0m2.640s

88::Sun Jul 14 17:13:42 EDT 2002

real 0m5.733s
user 0m2.530s
sys 0m2.620s

89::Sun Jul 14 17:13:49 EDT 2002

real 0m6.366s
user 0m2.120s
sys 0m3.000s

90::Sun Jul 14 17:13:57 EDT 2002

real 0m6.161s
user 0m2.750s
sys 0m2.330s

91::Sun Jul 14 17:14:04 EDT 2002

real 0m5.444s
user 0m2.500s
sys 0m2.550s

92::Sun Jul 14 17:14:10 EDT 2002

real 0m7.065s
user 0m2.710s
sys 0m2.290s

93::Sun Jul 14 17:14:18 EDT 2002

real 0m6.271s
user 0m2.520s
sys 0m2.540s

94::Sun Jul 14 17:14:26 EDT 2002

real 0m5.407s
user 0m2.320s
sys 0m2.720s

95::Sun Jul 14 17:14:32 EDT 2002

real 0m6.511s
user 0m2.630s
sys 0m2.510s

96::Sun Jul 14 17:14:39 EDT 2002

real 0m6.803s
user 0m2.490s
sys 0m2.620s

97::Sun Jul 14 17:14:46 EDT 2002

real 0m5.401s
user 0m2.660s
sys 0m2.310s

98::Sun Jul 14 17:14:53 EDT 2002

real 0m6.176s
user 0m2.670s
sys 0m2.360s

99::Sun Jul 14 17:15:00 EDT 2002

real 0m6.273s
user 0m2.570s
sys 0m2.570s

100::Sun Jul 14 17:15:07 EDT 2002

real 0m6.111s
user 0m2.280s
sys 0m2.800s

[Terra]

UNITY:

$ cd /big/dom/xexample/username
$ for i in $(seq 1 100);do echo "$i::"$(date); time ./testme.sh; echo; sleep 1;done 2>&1 | tee testme.results

HUGO:

$ cd /big/dom/xexample/testme
$ for i in $(seq 1 100);do echo "$i::"$(date); time ./testme.sh; echo; sleep 1;done 2>&1 | tee testme.results

**On HUGO, you'll notice that I setup the exact same directory/file structure to ensure the test was as accurate as possible...
**There is a minor difference between the two './testme.sh' scripts on each server as I was trying to covet any CDPATH overhead...
**Both test runs were run being logged in as your user account...

I will not post the './testme.sh' script due to it's server unfriendliness... Each of the 'for 1 .. 100' iterations above, runs the 'testme.sh' script which itself does 1001 iterations to derive a realistic average...

As you can see from the raw data above, the variance between the two servers is minimal at best...

At this point, I cannot duplicate any slowness at:
1) Network layer
2) Filesystem layer

There are just not any other areas to really look into... :(

--
Terra
--Computer, please run a Level 3 diagnostic--
FutureQuest

[pier]

WOW

This is what I call impressive...
Sorry you had to spend this much time on it.

I looked at vmstat etc. but also couldn't seem to find a thing, everything looked normal, but I really was experiencing this.
Guess this is one of those unexplainable things.

Could you btw please remove the <hugo> testme/ directoy ? It seems I can not remove files that are owned by root:root :)

Thanks,
Pier
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