Jim's Depository

openload, which is called openwebload at sourceforge, is a simple URL load tester. Just the right sized tool for checking if your spiffy new web page is efficient enough to be tolerated.

\$ openload localhost 10 URL: http://localhost:80/ Clients: 10 MaTps 355.11, Tps 355.11, Resp Time 0.015, Err 0%, Count 511 MaTps 339.50, Tps 199.00, Resp Time 0.051, Err 0%, Count 711 MaTps 343.72, Tps 381.68, Resp Time 0.032, Err 0%, Count 1111 MaTps 382.04, Tps 727.00, Resp Time 0.020, Err 0%, Count 1838 MaTps 398.54, Tps 547.00, Resp Time 0.018, Err 0%, Count 2385 MaTps 425.78, Tps 670.90, Resp Time 0.014, Err 0%, Count 3072
<You press enter to stop the run> Total TPS: 452.90 Avg. Response time: 0.021 sec. Max Response time: 0.769 sec

There is a Debian package.

Update: I couldn’t leave it alone. The attached patch will add bits/second reports. It is also worth noting that you can add  ”-l number” to sample for a certain number of seconds, and a “-o csv” to put out a CSV line of the data at the end for easier scripting. Perhaps it needs a man page too.

Update: If you are an especially trusting sort of person you could install the Debian package attached and not have to build it yourself.

Update: Best wait on this. There is something odd going on with openload that is giving unstable results for bytes transfered. More diagnosis required.

I, like most people, started using Javascript without first learning it. That was sort of fine back when all we did was stick a little statement in an onclick. When you find yourself writing more than 60 lines of JavaScript it is time to actually learn the language.

The development folk at Yahoo have a Yahoo! UI Library: YUI Theater with some videos to straighten out your understanding of JavaScript, wrap yellow warning tape around the broken corners of the language, and generally get you in shape to write real software in JavaScript.

I recommend these:

• Douglas Crockford - “The JavaScript Programming Language”
• Douglas Crockford - “Advanced Javascript”
• Douglas Crockford - “An Inconvenient API: The Theory of the DOM”

That is about 3 hours of video. If improving your productivity and product quality isn’t worth three hours, you might try the 40 minute “JavaScript: The Good Stuff”.

A list of things that I might add to femtoblogger:

• [DONE] Attachments.
• Some mechanism for fiddling with MIME types of attachments.
• Local copies of images. Pull it in, resize it to display size, click through to original size.
• {NO} Some sort of Todo list.
• [DONE] The concept of a draft copy of an article.
• I’d like to use PATH_INFO to have more meaningful URLs, but then I’m committed to .htaccess files working to keep sane URLs. Or maybe I just let the ‘.php’ show in the middle of the path.
• [DONE] Some time based archive structure in the nav section.
• An export format, perhaps based on Atom.
• [DONE] Support for external httpd authentication.
• [DONE] A global configuration page.
• [DONE] CSS takes variables from database now. Color skinning.
• [DONE] Use <META NAME=“ROBOTS” CONTENT=“NONE”> to keep robots out of the non-content areas.

ifstat - A little like a vmstat for network interfaces. This is pretty handy for a quick look at network saturation without have to break out some massive GUIfied tool with a hideous interface.

asbestos:\~# ifstat -b -i eth0,eth1,eth2,eth3
       eth0                eth1                eth2                eth3      
 Kbps in  Kbps out   Kbps in  Kbps out   Kbps in  Kbps out   Kbps in  Kbps out
   13.44     19.06    914.15    953.60      0.00      0.00      0.00      0.00
    9.73     10.71    632.22    630.49    300.84    286.86      5.27      4.72
   21.01     23.73    211.98    226.27      0.00      0.00      0.00      0.00
    2.23      3.33    260.78    281.29    293.32    315.72      5.80      4.72
    3.47      6.03    180.47    227.07      0.00      0.00      0.00      0.00

There is a debian package. And note that “-b” option to report in bits/second instead of bytes. What kind of person measures network use in bytes per second?

And in the same vein: iostat is hiding over in the systat package on debian. Use it too.

In this category I make notes of useful linux tools and utilities that are perhaps newer than 1997. If, like me, you tend to use your existing knowledge to get the job done, this list might be useful to see some of the things developed in the past 10 years.

Femtoblogger now shows on IE7. Not too bad. It only took 2 hours to work out the layout problems.

The most severe is that max-width: 600px in the CSS file brings up a bug when used inside a table cell. The cell gets expanded as if there was no max-width so the table ends up expanding to fill the screen. All the articles were cowering against the lefthand border of the screen with the nav stuff still on the right. (Firefox does this too but only if you are clicking a link in a table cell. There went 120 minutes of my life for that one.)

My ultimate solution was to make IE use a width: 600px instead. There is now an IE only CSS file that is loaded after the real one and has a rule to patch that up. Thankfully the IE blokes must have known they were being a menace to society and they built a special comment hack into their HTML parser to let people cope.

<!--[if IE]> <link rel=stylesheet type=text/css href=femtoblogger-ie.css> <![endif]-->

… it would have been nice to have something similar in CSS, that would save a file and a download.

You can read more about this hack at CSS Hacks- The good, the bad, and the ugly- Conditional comments

I have abandoned CSS columns. They are an ongoing time sink. If you are willing to specify hard physical pixel widths for the columns they almost work like I want, but not quite. Their background colors end early, and when you get a wider than planned element inside one it spills out on to neighboring content instead of resizing.

Back to the grand one row table for me. The CSS zealots may scoff, but my columns work right all the time.

On the plus side, I may now be web 2.0. I added a couple rounded corners and a drop shadow. Unless you are using IE.

I went ahead and registered femtoblogger.com which reminds me how much easier it is for me to write code than prose. Filling a page is just painful. I’ll have to make filling in that outline be a long term project.

For now it serves as a placeholder for people that might guess at the URL and will send them back to this blog for femtoblogger news. I suppose I need to rename this blog now which means more code. Blast.

This is half baked, but I’m going to roll it out and try to live with it. Articles and comments will now use a WYSIWYG interface for styling. I hope to remove the How do I insert-a-link/bold/blockquote? type of questions that interrupt people’s thought process when posting in a new venue.

The downsides are many:

• This uses the designMode and the execCommand() interface. execCommand() was probably designed by children and is functionally incomplete and inadequately specified. It promises to be a festering source of browser quirks and user bafflement for years to come.
• The HTML sanitizer will need to normalize as well to unquirk the postings.
• I need to also support a raw HTML mode for people with odd browsers.
• I will need to make decisions about copying in images and possibly resizing.
• I will probably need onscreen hinting ofsome sort to let people know how design mode works, e.g. They can drag in links and images.
• I will probably screw up and butcher comments at least several times.

But… what would life be without a little excitement, so here we go.

I noticed when abandoning the sexy 1 byte unicode dingbats for 160 byte PNGs in femtoblogger (to support the wretched Windows users of this world) that my images were being transfered on each page load. Bad for load time.

I had wrongly assumed that the Apache expiration module would give them a short expiration time by default. No problem, I added the expiration specification to my .htaccess file and managed to break my files completely. The system-wide Override setting prohibit that.

I could make server-wide changes, but with an eye toward users that can’t I came up with a new, better solution.

I serve the images through PHP. That is about half the speed of native, but I can put on a proper Expires header. (And PHP doesn’t put on its don’t cache me ever headers if you have a image/png content type.)

That gets more portable and safer, but how about better? I set my images so they all expire out of cache at the same time. Now I won’t have odd windows where some images have changed and others haven’t. When one icon expires, they all expire. It goes like this…

<php?
$icon = $HTTP_GET_VARS['icon'];$icons = array( 'edit' => 'images/edit.png',
        'delete' => 'images/delete.png');Header('Content-type: image/png');
Header('Expires: ' . gmdate('r', strtotime('next Sunday')));fpassthru( fopen( $icons[$icon], 'r'));
?>

Then you can load icon.php?edit and get the PNG for the edit icon with these headers…

HTTP/1.1 200 OK
Date: Wed, 12 Sep 2007 07:23:51 GMT
Server: Apache/2.2.3 (Debian) …
Expires: Sun, 16 Sep 2007 05:00:00 +0000
Content-Length: 164
Content-Type: image/png