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Are tuples more efficient than lists in Python?
... lists, moving this structure to tuples decreased lookup times by multiple orders of magnitude for multiple lookups. I believe this to be due to the greater cache locality of the tuple once you start using the tuple due to the removal of the second layer of indirection you demonstrate.
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Mod of negative number is melting my brain
... definition (my answer) is consistent with ALGOL, Dart, Maple, Pascal, Z3, etc. The "sign of divisor" (this answer) is consistent with: APL, COBOL, J, Lua, Mathematica, MS Excel, Perl, Python, R, Ruby, Tcl, etc. Both are inconsistent with "sign of dividend" as in: AWK, bash, bc, C99, C++11, C#, D, E...
How do CUDA blocks/warps/threads map onto CUDA cores?
...blocks with 6 threads = 64 warps * 10 instructions = 640 instructions
In order to get optimal efficiency the division of work should be in multiples of 32 threads. The hardware will not coalesce threads from different warps.
3'. A GTX560 can have 8 SM * 8 blocks = 64 blocks at a time or 8 SM * 48...
How does “cat
....
The following does not work for that case:
$ sudo cat <<EOF >/etc/somedir/foo.conf
# my config file
foo=bar
EOF
because the redirection is handled outside of the sudo context.
I ended up using this instead:
$ sudo tee <<EOF /etc/somedir/foo.conf >/dev/null
# my config file
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How to get last key in an array?
...a numerical array, keep in mind that numerical arrays do not have to go in order, or use all the numbers. This will work if you do not explicitly assign to numeric values, but if you do $a[1] = 1; $a[5] = 5; $a[0] = 0; Then you will have an array with keys (1, 5, 0), in that order. count($a) will ...
Maven skip tests
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I had some inter-dependency with the tests in order to build the package.
The following command manage to override the need for the test artifact in order to complete the goal:
mvn -DskipTests=true package
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ActiveMQ or RabbitMQ or ZeroMQ or [closed]
... If no wire protocol assumed: see other answers.
– Fletch
Dec 2 '10 at 10:53
19
Having worked in ...
java.net.UnknownHostException: Invalid hostname for server: local
...ping: cannot resolve myHostName: Unknown host then add an entry into your /etc/hosts file.
For that edit /etc/hosts file and add following:
127.0.0.1 myHostName
Hope it helps.
share
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impr...
MySQL: Large VARCHAR vs. TEXT?
... If all the columns are short and predictable (ex: MAC address, IMEI, etc... are things that never change) then use CHAR columns and you can make your row size fixed, which should speed things up considerably if using MyISAM, possibly also InnoDb although I am not sure about it.
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What is the difference between Unidirectional and Bidirectional JPA and Hibernate associations?
...rectional, I think it would be better to call setGroup() from addUser() in order to hold both sides consistent.
– axtavt
Mar 19 '11 at 16:24
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