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Long latency, fast site
01-10-2008, 08:52 AM
Post: #11
Long latency, fast site
I'm pretty sure I've had server loads that are okay. You can now check at http://www.scrooks.net/cgi-bin/load.cgi.

As I suspected, things were not _fixed_ last night, the problem just didn't show up. This morning everything is very, very slow again. I tried looking at things in firebug and ethereal, but I'm not sure I know what I'm doing well enough. It looks like the server is just taking forever to do an initial response -- but only for non-static pages.

I'm going on 4 days now with sites that are totally unusable during the day. Haven't heard from support since yesterday morning.

Now can someone in CA try http://www.scrooks.net/wiki to see what their response times look like during work hours?
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01-10-2008, 04:02 PM
Post: #12
Long latency, fast site
Mediawiki does a lot of queries to construct its page.

Looking at your wiki now I'm getting 10s to completion rather than the 5s I was getting last night. Some of the components were definitely slowish at 1s or more.

What are 50DISK50, 3DOM50, and 1IP1DOM50?
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01-14-2008, 11:58 PM
Post: #13
Long latency, fast site
I don't really have anything valuable to add... I just want to second the notion that MediaWiki seems to be prone to long latency periods -- as the original poster notes. I just one-click-installed my MediaWiki. Even though it's fairly "stock," it takes approximately 8 seconds of "Waiting for website.com..." before it connects. Then, when it actually connects with the server, the page loads very quickly.

Any tips for improving the speed?
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01-15-2008, 12:08 AM
Post: #14
Long latency, fast site
Quote:Any tips for improving the speed?
Just out of curiosity, are these sites using "pretty urls"?

Re-write rules can *considerably* delay server response times. Wink

--rlparker
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01-15-2008, 07:25 PM
Post: #15
Long latency, fast site
~1 sec loadtime from Australia (standard).

Care to share that load script? I'd like to take a look at it.
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01-16-2008, 05:29 AM
Post: #16
Long latency, fast site
The conclusion to all this is that my server was being pounded (on something other than my sites). Load averages were 10+ during the day. I mistakenly thought that those were already expressed in a percentage, so I didn't think it was bad. Not sure why Dreamhost didn't catch it.

For some odd reason, the server had much lower load times yesterday. Maybe the site getting pounded got moved to a new server because that site owner complained? Don't know. We'll see what happens today. Dreamhost support says they'll move me to a new server if that's what it'll take.
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01-16-2008, 11:29 AM
Post: #17
Long latency, fast site
I'm getting the same long load times on any site that uses a database.

I've tested a basic php page with some logic etc but without a database connection and it all seems fine for me that way... but as soon as I try anything with a database the page load time jumps up to between 10 and 30 secs with pages often timing out.

I've contacted DH support 3 times about this now and each time they do something that resolves the problem temporarily and then it comes back again a few days later.

Josh did add a months worth of hosting fees to my account for the last one though but I'm still having the problem so that doesn't really help.

I'm on webserver ajax and database server nanook.

The load script running on my server outputs the following...

10:29:24 10.58, 9.09, 10.16

I have no idea what that means.
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01-16-2008, 12:41 PM
Post: #18
Long latency, fast site
I'm have the exact same problem as the user above.

I have gone back and forth numerous times with support, but with no satisfaction. Each time they do something to make it better temporarily. I'm never told what was done and within a few hours it goes back to the way that it was. Very slow...10-30 seconds and then the page pops.

There is a mysql string error displayed on the mysql control panel, but support claims it is benign. I don't care if it is, I just want it resolved so that it can be ruled out as the cause.

Also, many mysql variables are in the 'red' including the 'slow queries' variable. Can't be good.

I'm on the Triton server, which always displays a 'high load' in the diagnostic test run from the control panel.

I'm still waiting to see what they say now. I'll update with the results.

If anyone else gets a resolution would you update this thread?

Thanks.
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01-16-2008, 01:11 PM
Post: #19
Long latency, fast site
I've found the "high load" diagnostic warning to be accurate. For some reason, it's a bear for them to get the load down from a user/site that is overloading the server. I know that sometimes loads are so high they can't even log in to the server to figure out what's going on, which obviously makes it time consuming to debug these issues.

I also think they don't like just immediately shutting down users completely who are killing the server. We could obviously have some good discussions about the needs of the many vs. the needs of the one.

What are 50DISK50, 3DOM50, and 1IP1DOM50?
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01-16-2008, 02:53 PM
Post: #20
Long latency, fast site
I spent a little time poking around the wiki trying to determine what a "high" load number is. In one place, http://wiki.dreamhost.com/116_Common_Questions (Question 2), it says they try to keep them under the 2 to 3 range. In another place, http://wiki.dreamhost.com/Uptime, it indicates that anything over 1 is bad. And I found another place which I don't have the URL for where it talks about how on these multiprocessor servers anything under 3 or so is perfectly fine. It's all a little unclear, and I'm hoping to get an answer to the question, "for what load values should I inform support there's a problem?" from support in the next day or two.

When I was having problems, my server showed loads that varied from 7 to 12. Now I understand that that was clearly the problem. For the last two days the loads have been 3 or less and my sites have run far better. Astonishingly fast when the load is <1.

I understand these are shared servers and loads will possibly vary wildly, but it would be very handy to know what official value to watch for to raise a red flag with support. (Anyone here ever been told that number?)

If you are seeing 10+ loads, contact support and _tell_them_the_numbers_.

Note also that my server also usually showed the "high load" diagnostic warning, but I glossed over it because I assumed it would be one of the first things support checked and if they didn't seem to think it was a big deal it must be a meaningless warning. Now I think that was a really bad assumption. I'm not sure why support wouldn't check load values first thing with problems like this. I'd like to give them the benefit of the doubt and think that they do check it and there are other reasons why it doesn't raise an alert....
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