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ramblings of a php developer -- home archives links contact switcher nodejs and blocked io july 7th, 2014 no comments the problem we recently hit a major performance problem with our nodejs application that took some investigation, firstly a brief overview of nodejs as i now understand it (which i didn’t before debugging this problem). background your application code runs in a single thread. your code will block all your other code from running. four[1] io threads are used to run io operations asynchronously from your code. one more additional thread is used as the event loop (epoll) this means that at any given time we can expect nodejs to be running with 6 threads in total. diagnosis back to our application… we found that while a long running database query was executing io could completely lock up, including unrelated operations like file read/writes. during a problem phase i used gdb to inspect the state of the process and this is what i saw:- (gdb) info threads id target id frame 6 thread 0x7ffff7fe4700 (lwp 23141) “signalsender” 0x00007ffff7023420 in sem_wait () from /lib/x86_64-linux-gnu/libpthread.so.0 5 thread 0x7ffff7f52700 (lwp 23153) “node” 0x00007ffff702418d in read () from /lib/x86_64-linux-gnu/libpthread.so.0 4 thread 0x7ffff7f11700 (lwp 23156) “node” 0x00007ffff7023cec in __lll_lock_wait () from /lib/x86_64-linux-gnu/libpthread.so.0 3 thread 0x7ffff7ed0700 (lwp 23159) “node” 0x00007ffff7023cec in __lll_lock_wait () from /lib/x86_64-linux-gnu/libpthread.so.0 2 thread 0x7ffff7e8f700 (lwp 23160) “node” 0x00007ffff7023cec in __lll_lock_wait () from /lib/x86_64-linux-gnu/libpthread.so.0 * 1 thread 0x7ffff7fe6720 (lwp 23140) “node” 0x00007ffff6d670d3 in epoll_wait () from /lib/x86_64-linux-gnu/libc.so.6 let’s see what each thread is and what’s doing:- thread: #1: from the epoll_wait() call we can deduce this is the nodejs event loop. thread: #5: by running a backtrace on the thread it was clear to see this is an active database query to our database server. this is obviously an io thread. threads: #2-#4: these threads are waiting for a lock to be released before they run. these are obviously also io threads. thread: #6: this is the thread for running our application code (also clear from performing a backtrace on the thread). from that state we can see that all the io threads are consumed with work so any future io request must sit and wait for an io thread to become free. this is why we are seeing all the io block. the question is why are we seeing 3 io threads being needlessly “wasted” just to sit there and wait for a lock to release? when we perform a backtrace on all of these 3 threads we see that they are blocked within the database library itself and thus we can finally understand the big flaw with our application design and the reason for this performance problem. our application is using a single database connection so it’s clear that this is what’s happening:- a database query gets “dispatched” to an io thread to run and does so. further database work comes in, gets “dispatched” to the remaining io threads but they can’t run because the single database connection is already in use so it sits there, within the database library, waiting for the connection to become free. with 4+ pieces of database work we have filled all of the io threads so any other io work must sit and wait for an io thread to become free. this is quite a fundamental design flaw with our application. the solution fortunately the solution is rather simple and we’ve refactored the application to use a database connection pool (courteousy of node-pool [generic-pool]) so that we now have more than one database connection to work with so that our database queries can run in parallel and not block waiting for each other. with nodejs v0.10+ we can also take that one step further. in this version libeio as been replaced with a threadpool implementation within libuv. this introduces a new environment variable that allows you to increase the number of io threads beyond 4 abcpaperwriter.com by setting the environment variable:- uv_threadpool_size (range: 4 – 128, default: 4). we set this to around 1.5 * cpus (in our case this was 12.) now we have more io threads to work with and more database connections available so that queries can run in parallel. is there anything else we can do? yes! to ensure that db work cannot fully consume the io threads and block file reading/writing we set the maximum pool size to be one less than the uv_threadpool_size. this means that only uv_threadpool_size – 1 database operations will ever occur in parallel which leaves one io thread available at all times for our other io operations (which are minimal) like file reading/writing. coding , tech blocking , nodejs introducing sspkd march 13th, 2012 no comments sspkd is a system to securely distribute your ssh public keys to multiple hosts. security is achieved through the use of your gpg key to sign authorized_keys file updates which are verified on each recipient machine before an update to the authorized_keys file takes place. in the event an invalid signature is presented then the update is not performed, so if your ‘central’ sspkd server was compromised then an attacker would be unable to simply add their sshkey and push it onto all your other hosts. sspkd is currently an alpha-release and is available from github: http://github.com/kmdm/sspkd http://writingpapershelp.com coding , linux , tech authorized_keys , distribution , public key , sharing , ssh ubuntu, firesheep, aircrack-ng and wpa november 26th, 2010 12 comments introduction following some tinkering i’ve been doing with airtun-ng (and a bugfix i made to ticket #667 to support decrypting wpa ccmp aes qos packets) it is (now) possible to live capture/sniff wpa traffic providing the wpa handshake is observed. in effect this allows firesheep (and sidejacking in general) to work on a wpa (psk) network. step 1: firesheep firstly you need to get firesheep completely setup, this is outside the scope of this guide – there are excellent instructions provided on the infamous github pull request #70 . once firesheep is setup and you’re able to pick an interface you should proceed. step 2: aircrack-ng now we can move onto patching aircrack-ng to support wpa networks, to do this you need to do do a checkout from svn, patch the code and then compile it yourself. $ svn co http://trac.aircrack-ng.org/svn/trunk/ aircrack-ng $ cd aircrack-ng/src $ wget http://trac.aircrack-ng.org/raw-attachment/ticket/667/ticket-667.patch $ wget http://trac.aircrack-ng.org/raw-attachment/ticket/74/airtun-ng-wpa.patch $ patch -p0 < ticket-667.patch $ patch -p0 < airtun-ng-wpa.patch $ sudo apt-get build-dep aircrack-ng $ cd .. $ make with any luck this should now compile successfully and your new binaries should be located in the src/ directory. step 3: bringing it all together now we’re ready to use aircrack to live capture off wpa networks and feed the data into firesheep for analysis… open up a terminal and run (change adapter names and substitute values as appropriate):- $ sudo airmon-ng start wlan0 channel $ sudo src/airtun-ng -a bssid -e essid -p wpapsk mon0 note: used airmon-ng from the standard package installed version since i couldn’t find it in svn and didn’t investigate too much/far! this should start a tap interface on at0 (or similar) on which the decrypted traffic is fed. now open another console and run (change ip address if it conflicts with your local subnet):- $ sudo ifconfig at0 10.10.10.10 up the ip address is needed since in my experience firesheep appears to require it. now open up firesheep, go into preferences, pick the at0 interface and hit the start capture button. now on your other wireless client.. disconnect and reconnect to the wireless network (so that the wpa handshake can be observed) and login to facebook research paper help . with any luck firesheep should see the session and double clicking on that session should access your

URL analysis for kennynet.co.uk

https://www.kennynet.co.uk/tag/blocking/
http://www.kennynet.co.uk/misc/lirc-imon
https://www.kennynet.co.uk/2014/07/07/nodejs-and-blocked-io/
https://www.kennynet.co.uk/tag/cleanup/
https://www.kennynet.co.uk/tag/shamir/
https://www.kennynet.co.uk/2009/03/30/ubuntu-lirc-and-the-antec-black-fusion-152c0038/
https://www.kennynet.co.uk/tag/config-file/
https://www.kennynet.co.uk/2009/04/27/ubuntu-jaunty-upgrade-encrypted-home-not-mounting/#respond
https://www.kennynet.co.uk/2010/04/
https://www.kennynet.co.uk/2009/10/
https://www.kennynet.co.uk/tag/password-reset/
https://www.kennynet.co.uk/2012/03/13/introducing-sspkd/
https://www.kennynet.co.uk/tag/cdr/
https://www.kennynet.co.uk/category/general/
https://www.kennynet.co.uk/2008/11/26/php-and-pdf-templates/

Whois Information

Whois is a protocol that is access to registering information. You can reach when the website was registered, when it will be expire, what is contact details of the site with the following informations. In a nutshell, it includes these informations;

Error for "kennynet.co.uk".

the WHOIS query quota for 2600:3c03:0000:0000:f03c:91ff:feae:779d has been exceeded
and will be replenished in 360 seconds

WHOIS lookup made at 05:41:27 25-Aug-2017

--
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Copyright Nominet UK 1996 - 2017.

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  REFERRER http://www.nominet.org.uk

  REGISTRAR Nominet UK

SERVERS

  SERVER co.uk.whois-servers.net

  ARGS kennynet.co.uk

  PORT 43

  TYPE domain

DISCLAIMER
This WHOIS information is provided for free by Nominet UK the central registry
for .uk domain names. This information and the .uk WHOIS are:
Copyright Nominet UK 1996 - 2017.
You may not access the .uk WHOIS or use any data from it except as permitted
by the terms of use available in full at http://www.nominet.uk/whoisterms,
which includes restrictions on: (A) use of the data for advertising, or its
repackaging, recompilation, redistribution or reuse (B) obscuring, removing
or hiding any or all of this notice and (C) exceeding query rate or volume
limits. The data is provided on an 'as-is' basis and may lag behind the
register. Access may be withdrawn or restricted at any time.

  REGISTERED no

DOMAIN

  NAME kennynet.co.uk

NSERVER

  NS1.TRUELINE.NL 94.142.246.111

  PSI.KENNYNET.CO.UK 176.9.40.153

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