I am running an Apache Server and I have placed a script to generate a report within the CGI-BIN which I can then start running from link in simple webpage I put together.
The script works no problem. What I have noticed though is that if I attempt to run two or more of the same script through the browser they are queued, i.e. the second will not run until the first is done? I was wondering why this happens and if it is possible to turn it off if necessary,
Thanks
It turns out that it was actually Chrome queueing the requests rather apache.
I tried it on different browsers and it worked fine.
Related
So we are doing distributed testing of our web-app using JMeter. For that you need to have the jmeter-server.bat file running in background as it acts as sort of a listener. The problem arises when one of the slave machine out of 4 restarts due to the load and the test is effectively stuck right there as the master machine expects some output from the 4th machine. Currently the automation is done via ansible-playbooks which are called in Jenkins. There are more or less 15 tests that are downstream to one another. So even if one test is stuck, the time is wasted until someone check on the machines.
Things I've tried so far:
I've tried using the Windows Task Scheduler and kept the jmeter-server.bat to run without any user loggin in, but it starts the bat file in background which in-turn spawns all the child processes in the background as well i.e. starts Selenium Chrome in headless mode.
I've tried adding the jmeter-server.bat in startup and configuring the system to AutoLogon without any password to trigger a session which will call the startup file. But unfortunately the idea was scrapped by IT for being insecure.
Tried using the ansible playbook by using the win_command but it again gets stuck as the batch file never returns anything.
Created a service as well for the bat file, but again the child processes started in background.
The problem arises when one of the slave machine out of 4 restarts due to the load
Instead of trying to work around the issue I would rather recommend finding the root cause and fixing it.
Make sure to follow JMeter Best Practices
Configure Java to take heap dump on failure
Inspect Windows PerfMon and operating system/application logs
Check presence of .hprof files in the "bin" folder of your JMeter installation and see what do they say
In general using Selenium for conducting the load is not recommended, I would rather suggest using JMeter's HTTP Request samplers for that, given you properly configure JMeter to behave like a real browser from the system under test perspective there won't be any difference whether the load comes from HTTP Request samplers or from the real browser.
The same states documentation on the WebDriver Sampler
Note: It is NOT the intention of this project to replace the HTTP Samplers included in JMeter. Rather it is meant to compliment them by measuring the end user load time.
I'm using WKHtmlToPdf to generate some docs here at work, in internal applications, for over one and half year without any problem. Some applications are coded in C++, some in AutoIt3, and today, after restarting all the computers due to external reasons (power generator would be tested), wkhtmltopdf stopped working on all machines at my company.
I can't even run it from command line. Whether I try to convert a webpage or a local HTML file, it always hangs on 10%. All our machines are Windows 8 32 bits and runs their own install (the applications aren't running under a network share).
I tried downloading wkhtmltopdf again from the website, installing it, etc, but nothing worked. I also tried adding --disable-javascript option, which also didn't work. Cleaning %TEMP% folder did not help too.
I never faced anything like this. All the machines were restarted normally, going to start menu, etc. And it does not look like a network issue, since I'm accessing internet to write this, and we are a small company, we use a standard Wi-Fi router, just like your house. Nothing was changed, no file deleted, no Windows update, no network settings... just a restart. I saw some guys facing the same problem when trying to run wkhtmltopdf from PHP, but in this case, I have this problem even by running it from DOS, as anyone would do.
wkhtmltoimage is working fine. Just wkhtmltopdf stopped working.
Screenshot
In my case, wkhtmltopdf was hanging on files locally stored after the progress counter had made an initial jump to the percentage corresponding to 1 page. It turned out that I had an http_proxy variable set to some unaccessible proxy server. Clearing this environment variable solved the issue.
I'm running XAMPP on my windows machine and experiencing a problem with Apache crashing a couple times a day. When it does, a dialog pops up and I have to manually tell windows to end the program. After I do that, XAMPP automatically starts it back up in a couple of seconds with no issues. When it crashes while I'm not home though, the server is down until I get back. So I have two questions:
Are periodic crashes something that should be expected, or is this indicative of another issue I should be trying to pinpoint?
If this is something I should just learn to deal with, is there a way to automatically restart httpd.exe when these issues occur, so I don't experience down time when I'm away from home?
You'd look into log files, especially the Apache access and error logs, to see what happened, when you are not at home. I've met some similar situation: I have a problematic PHP script hosted on my server, when someone visits the page, it leads to an Apache crash.
I'd suggest you do the investigation as follows:
Search the timestamp of recent Apache restart.
Check the Apache access log to see whether there are some scripts have been accessed.
Manually access these scripts in your browser (to see if Apache will crash again)
You'd better check the PHP error log as well.
If there is really nothing suspicious, you can try WAMP bundle alternatively, which is also a very popular PHP development environment and it is stable.
Although there aren't many cases in which one should "expect" periodic crashes, in this case you are better of reconsidering your setup. From the frontpage of the XAMPP site:
XAMPP is the most popular PHP development environment
Sure, you can use it as "production" server, but XAMPP isn't build for hosting websites, it is intended as development server, so you don't have to manually setup Apache, PHP and MySQL on you dev machine. If you actually want to run your website for the public, setup Apache/IIS, MySQL and PHP manually, those products on there own are made for running in production. Or you can consider getting some cheap shared hosting somewhere, so you don't need to setup anything.
I'm hosting my website www.xgclan.com with the latest apache 2.4.1 and sometimes my server gets jammed, it doesn't seem to send any data but you don't get a timeout like when the Apache process isn't running.
A reboot of the process resolves this issue.
It seems to happen when you open the website in multiple browsers on the same system.
I've tested it on 2 different systems to make sure its not a bandwith or cpu problem.
Putting this without the quotes "AcceptFilter http none" in the httpd.conf fixed the issue for me.
I found the solution here: http://www.apachelounge.com/viewtopic.php?t=4543&postdays=0&postorder=asc&start=20
I just upgraded my browser to Safari 4 and find that our website is having some major issues specific to that browser version. As I click through pages on our site it takes one or two clicks before the browser window simply goes blank. When the window goes blank, there is no source to view and no matter how many times I try to reload or if I try to load other pages of the site, I still get the blank window. It's as if the server takes the request and simply returns a blank page.
If I wait over 15 seconds and then hit refresh again, the page loads fine. Not sure why it starts working again... Maybe a cache issue???
It's a PHP site and I've tried turning on error_reporting(E_ALL);, but that doesn't give any information. I also tried putting an echo statement at the very beginning of the index.php file and verified that the page still goes blank without echoing that statement, so I'm thinking the problem is not php code specific. The Apache error log does not show any issues. I have the same site on my local development server and it doesn't have the problem.
Safari 4 is the only browser that shows this problem. Does anyone have any ideas how to debug/fix this?
My webserver is ubuntu Hardy running Apache 2 an Mysql 5.
We have an nginx load balancer in front of the apache server and I just figured out that Safari 4 requires the nginx keepalive_timeout setting to be 0. Took all day to figure that one out...
I've been having the same issue with Safari 4 on my site but found that when reloading pages that return blanks, the request never even makes it to the server. No entry shows up in Apache's logs.
The keepalive setting for your LB sounds like a direction I could sniff in. Not sure what leeway I will have though, being on shared hosting.
Mike
This looks to be a safari bug. We experience it too, and I have read other reports.
http://discussions.apple.com/thread.jspa?threadID=2064488&start=0&tstart=0