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• lowest latency, least overhead app server?

  - by Mark Harrison

  I'm designing an application which will have a network interface for feeding out large numbers of very small metadata requests. The application code itself is very fast, basically looking up data cached in memory and sending it to the client. What's the absolute lowest latency I can get for a network application server running on a linux box? …

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• Python: disabling $HOME/.python-eggs?

  - by Mark Harrison

  Is there an easy way to disable Python egg caching? We have the situation where a system account needs to run a python program which imports a module. Since this is a non-login robot account, it does not have a home directory, and dies trying to create the directory /.python-eggs. What's the best way to fix this? Can I convert my eggs in…

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• Python: socket server framework like Tcl "socket -server"

  - by Mark Harrison

  I'm looking to reimplement some Tcl code that uses the socket -server construct [1]. What's the best option in Python for a small, industrial strength multi-user network-based server that includes event loop processing/integration? [1] http://www.tcl.tk/man/tcl8.4/TclCmd/socket.htm

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• Good way to capture/replay sessions from Apache Log?

  - by Mark Harrison

  For performance testing, I would like to capture some traffic from a production server and use that as a basis to replay the request to a test server in order to simulate a realistic load in our development environment. These are all stateless queries, so no issues regarding cookies, sessions, etc. The Apache log timestamps everything down…

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• Berkeley DB replication: what's the typical latency?

  - by Mark Harrison

  I'm interested in using Berkeley DB replication to cache some data on some server nodes. What kind of update latency can I expect to see among the nodes? These will all be locally networked nodes.

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• JSON_Spirit: good examples of unpacking a JSON string?

  - by Mark Harrison

  Any good examples/tutorials of unpacking JSON strings with the C++ JSON_Spirit library? Something that can traverse a json_spirit::Value object and pretty-print it would be ideal.

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• Get rid of wasted/unused space in a JMenu

  - by Trevor Harrison

  In my app, I've got a menu bar with a File menu. In the submenus, each JMenuItem is wasting a lot of white space to the left of the text for a checkbox (I think), even though I'm not including any JCheckBoxMenuItems. I'm seeing lots of other java/swing apps who's menus don't waste this space. How do I do it in my app?

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• Writing csv files with python with exact formatting parameters

  - by Ben Harrison

  I'm having trouble with processing some csv data files for a project. The project's programmer has moved onto greener pastures, and now I'm trying to finish the data analysis up (I did/do the statistical analysis.) The programmer suggested using python/csv reader to help break down the files, which I've had some success with, but not in a…

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• Good tutorial on wavelet compression?

  - by Mark Harrison

  Any web sites, books, etc, that have a good tutorial on wavelet compression? I'd be interested in two tracks... a heavyweight tutorial that plows through the math, and a "light" one that just hits some concepts and highlights.

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• Python: Best way to check for Python version in program that uses new language features?

  - by Mark Harrison

  If I have a python script that requires at least a particular version of python, what is the correct way to fail gracefully when an earlier version of python is used to launch the script? How do I get control early enough to issue an error message and exit? For example, I have a program that uses the ternery operator (new in 2.5) and…

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• Berkeley DB: btree prefix comparison for directory-like keys?

  - by Mark Harrison

  I'm going to index a BDB with keys that look a lot like directory paths ('/foo/bar', '/foo/baz', etc, with levels of slashes generally < 10). Does anybody have any experience with using a Btree prefix comparison routine[1] for this? Are the savings worthwhile? Any references to experience papers on this subject? [1]…

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• Best environment for Python on Windows?

  - by Mark Harrison

  So I've got plain python downloaded, so I can run .py files from the command line. Now I want to step it up, have a debugger, be able to call .net or other Windows things, etc... What's my next step? What's a good Python environment for Windows?

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• Our GUI Situation

  - by shawn-harrison

  These days, any decent Windows desktop application must perform well and look good under the following conditions: 1) XP and Vista and Windows 7. 2) 32 bit and 64 bit. 3) With and without Themes. 4) With and without Aero. 5) At 96 and 120 and perhaps custom DPIs. 6) One or more monitors (screens). 7) Each OS has it's own…

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• Python: what package contains the installation metadata?

  - by Mark Harrison

  e.g., how can I find out that the executable has been installed in "/usr/bin/python" and the library files in "/usr/lib/python2.6"?

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• REST/JSON: Should I include a newline after the JSON string?

  - by Mark Harrison

  If I'm returning ["foo"] from a RESTful web query, Which of these is more proper? Will pedantic REST parsing die on the newline? ["foo"]\n (with newline, Content-Length=8) ["foo"] (no newline, Content-Length=7) For easy regression testing I like the form with the newline, but I want to make sure I won't be…

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• SQL Design: representing a default value with overrides?

  - by Mark Harrison

  I need a sparse table which contains a set of "override" values for another table. I also need to specify the default value for the items overridden. For example, if the default value is 17, then foo,bar,baz will have the values 17,21,17: table "things" table "xvalue" name stuff name xval ---- ----- …

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• Berkeley DB replication: upper limit on number of replicants?

  - by Mark Harrison

  I'm considering using Berkeley DB to cache some data on an application cluster. What's a reasonable upper limit on the number of nodes I can plan on Berkeley DB handling? Writing to the database will be from a single node.

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• Terminology: opposite of "zero copy"?

  - by Mark Harrison

  We're benchmarking some code that we've converted to use sendfile(), the linux zero-copy system call. What's the term for the traditional read()/write() loop that sendfile() replaces? I.e., in our report I want to say "zerocopy is X millisecs, and ??? is Y millisecs." What word/phrase should I use?

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• How should developers cope with so many GUI configuration combinations?

  - by shawn-harrison

  These days, any decent Windows desktop application must perform well and look good under the following conditions: XP and Vista and Windows 7. 32 bit and 64 bit. With and without Themes. With and without Aero. At 96 and 120 and perhaps custom DPIs. One or more monitors (screens). Each OS has its own preferred…

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• Processing: popen() call to start subprocess?

  - by Mark Harrison

  Here's an example of opening and reading data from a TCP socket. Is there a a popen() call or equivalent that can start a child process and read its output? void setup() { c = new Client(this, "127.0.0.1", 12345); // Replace with your server's IP and port } void draw() { if (c.available() > 0) { …

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• JSON_Spirit: mapping value.type() back to the type?

  - by Mark Harrison

  You can display a Value's type like this: cout << val.type() << end; and it print a number. How can I map this number back to the actual type?

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• What is the best way to avoid SQL injection attacks?

  - by Mark Harrison

  I've provided a solution for Python... please flesh this out with examples for other languages.

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• HTTP: guidelines for common User-Agent: headers?

  - by Mark Harrison

  I'm sure there's no official standard, but are there some guidelines for identifying and classifying browsers based on the User-Agent string they send?

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• How to retrieve view of MultiIndex DataFrame

  - by Henry S. Harrison

  This question was inspired by this question. I had the same problem, updating a MultiIndex DataFrame by selection. The drop_level=False solution in Pandas 0.13 will allow me to achieve the same result, but I am still wondering why I cannot get a view from the MultiIndex DataFrame. In other words, why does this…

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• maximum length of HTTP GET request?

  - by Mark Harrison

  What's the maximum length of an HTTP GET request? Is there a response error defined that the server can/should return if it receives a GET request exceeds this length?

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