real 0m4.536s
So now the connection was closed but the program still tried to read data from it. So basically there was a dead lock. After setting up the limit the problem disappeared. Further Marco and Me looked into using the Coda file system for our Laptops. We have now requested a server and hopefully we can start installing next week. This should be really cool as this is a networked file system that will sync when it reconnects. So you can take your laptop home work offline and when you come back to work you can keep on working on your big work pc. I further did some research into shadow-utils and userlib. Without going into to much detail userlib is really nice. I don't really understand why so many people still use shadow-utils. I am currently lobbing for userlib to become the standard at Cern. I started thinking about disaster recovery and disaster management. I wrote a script that will run on a server and query the Ldap server every 15 minutes about it's entries then it creates the /etc/passwd, /etc/groups and /etc/shadow. So in the unlikely event that Ldap goes down and Kerberos is still up. The files can just be copied to all the machines and users can still use them.
I started to have a look at the quattor sendmail component that automatically configures the sendmail program. The syntax is really horrible of the sendmail config file. But more to come about this. While writing this I am waiting for my sendmail patches to be commit to the test cluster. Through some minor changes I reduced the run time from about 1 1/2 minutes (real 1m12.017s ) to half a second. (real 0m0.875s).
Further I attended quite a few meetings. And a talk about the new castor scheduler.
This week my Perl script or quattor module went into production. I build the rpm and then did loads of testing on my cluster. I had to pretty much try all the different scenarios under which my program could be run (Dan: installed a machine... lots of times). There were some minor problems but now it is on swrep (the Cern software repository). Because it was such a huge change I got my own version number. Normally the counting is done 2.0.x or something like that, but because I changed so much I now started the 3.0.0 tree. I did some benchmarking on my code and found that it behaved quite linear.
After some research I found out that the library function, I was calling to execute a shell command, had a sleep(1) in it. The idea behind this is to be sure that all buffers have been flushed before it returns. But this of course has a linear execution time as a result. As I don’t rely on the output I simply created a work around, but for the long run I am thinking of changing my program to be multithreaded.
Further I helped Dan to design his new Aims replacement. A system to distribute pxe images, and get the right machine to boot the right OS.
I had a look at the new Google Android mobile development SDK. It seems to be really cool. I wrote a little “hello world” program in it. Currently I am thinking about something I could write for it. Ideas will come.
I can notice the difference at Work. How I see the people I work with and how I interact with them. For 3 Euro this was one of the best books I have read. Another really good point is the size. It is so small that you can easily fit it in a pocket and big enough to nicely read it.
So now you think ahhh brilliant this will be nice and secure. So you enter your User Name and your password. Lets assume my name is 'r2d2' and my password is 'security'. Lets have a look at the package that is sent over the so trustworthy Internet.
Cookie: sessionid=1245b528-ae7e-4022-9300-0f580a07f33e:0x409; ASPSESSIONIDCC DRTSCS=NKDGCHNAEPBLGGFDAOHGPAHM\r\n
Authorization: Basic cjJkMjpzZWN1cml0eQ==\r\n
Credentials: r2d2:security
\r\n
Posts
All Comments
