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What platforms have something other than 8-bit char?
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For instance, most early-90s developers assumed that a particular no-op CPU timing delay taking a fixed number of cycles would take a fixed amount of clock time, because most consumer CPUs were roughly equivalent in power. Unfortunately, computers got faster very quickly. This spawned the rise of...
Generating random integer from a range
...ate tens of millions of random numbers in less than a second on a standard CPU with this technique.
EDIT:
Although the above is technically correct, DSimon's answer is probably more useful in practice. You shouldn't implement this stuff yourself. I have seen a lot of implementations of rejection s...
Increasing the maximum number of TCP/IP connections in Linux
...ique allows me to use large data packets, reduce fragmentation, reduces my CPU utilization both in the user land and at kernel-level.
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Java Programming - Where should SQL statements be stored? [closed]
...k-in in the java world is interesting.
I hope you haven't paid $50000 pr CPU for Oracle Enterprise, and then only used the least common denominator in order to switch to Mysql any minute. As any good DBA will tell you, there are subtle differences between the different big name databases, especial...
What integer hash function are good that accepts an integer hash key?
... input results in a different output). The algorithm is fast except if the CPU doesn't have a built-in integer multiplication unit. C code, assuming int is 32 bit (for Java, replace >> with >>> and remove unsigned):
unsigned int hash(unsigned int x) {
x = ((x >> 16) ^ x) * ...
Python: split a list based on a condition?
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IMHO, if you know a way of doing it with less cpu usage (and thus less power drain), there is no reason not to use it.
– winden
Jun 4 '09 at 19:46
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Difference between malloc and calloc?
... do some tricks to speed it up. I know that FreeBSD, when it gets any idle CPU time, uses that to run a simple process that just goes around and zeroes out deallocated blocks of memory, and marks blocks thus processes with a flag. So when you do calloc, it first tries to find one of such pre-zeroed ...
How do I detect unsigned integer multiply overflow?
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Some compilers provide access to the integer overflow flag in the CPU which you could then test but this isn't standard.
You could also test for the possibility of overflow before you perform the multiplication:
if ( b > ULONG_MAX / a ) // a * b would overflow
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What is the best algorithm for overriding GetHashCode?
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Incidentally, 31 is a shift and subtract on the CPU, which is exceedingly fast.
– Chui Tey
Aug 22 '13 at 23:14
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In-Place Radix Sort
...aiive representation. Addressing becomes more complex, but the ALU of your CPU has lots of time to spend during all the cache-misses anyway.
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