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How to round up the result of integer division?
...nverting to floating point and back seems like a huge waste of time at the CPU level.
Ian Nelson's solution:
int pageCount = (records + recordsPerPage - 1) / recordsPerPage;
Can be simplified to:
int pageCount = (records - 1) / recordsPerPage + 1;
AFAICS, this doesn't have the overflow bug th...
How to install Boost on Ubuntu
...$user_configFile
Find the maximum number of physical cores:
n=`cat /proc/cpuinfo | grep "cpu cores" | uniq | awk '{print $NF}'`
Install boost in parallel:
sudo ./b2 --with=all -j $n install
Assumes you have /usr/local/lib setup already. if not, you can add it to your LD LIBRARY PATH:
sudo sh ...
What's the best way to convert a number to a string in JavaScript? [closed]
...ware of the coercion rules. Ultimately developer time is more costly than CPU time, so I'd optimize for the former at the cost of the latter. That being said, in this case the difference is likely negligible, but if not I'm sure there are some decent JavaScript compressors that will optimize this ...
How to check if a process is running via a batch script
... for such a simple query, but they also run a second or so and use tons of cpu! This is much better, also worked with no admin permissions (Windows Server 2012).
– Eugene Marin
Jun 21 '18 at 15:36
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How can I clear or empty a StringBuilder? [duplicate]
...'s a lot faster just to set the text length to zero (virtually no work for CPU) and reuse the same buffer.
– Sulthan
Jun 14 '11 at 9:08
14
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Divide a number by 3 without using *, /, +, -, % operators
...s you know how the +, -, * and / operators are actually implemented on the CPU: simple bitwise operations.
– craig65535
Jul 27 '12 at 21:55
21
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How to delete a specific line in a file?
... files as big as 12-50 GB, and the RAM usage remains almost constant. Only CPU cycles show processing in progress.
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How can I round up the time to the nearest X minutes?
... Just pointing out, modulus is a requires a division operation on the CPU. But I agree that it is more elegant that using the rouding down property of integer divisions.
– Alex
Feb 16 '17 at 15:17
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Difference between StringBuilder and StringBuffer
...ng and unlocking code for synchronization which will unnecessarily take up CPU time. Don't use locks unless it is required.
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How does Python manage int and long?
... are handled by the Int class. The default size of Int will depend on your CPU architecture.
For example:
32 bit systems the default datatype for integers will be 'Int32'
64 bit systems the default datatype for integers will be 'Int64'
The min/max values of each type can be found below:
Int...