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Why is it bad practice to call System.gc()?
...the garbage collector explicitly. Calling the GC at the wrong time wastes CPU cycles. You (the programmer) do not have enough information to determine when the right time is ... but the JVM does.
– Stephen C
Oct 6 '11 at 8:16
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Caveats of select/poll vs. epoll reactors in Twisted
...are active at any given time.
All this means that epoll will lead to less CPU usage for most workloads. As far as memory usage goes, it's a bit of a toss up. select does manage to represent all the necessary information in a highly compact way (one bit per file descriptor). And the FD_SETSIZE (t...
How do you convert a byte array to a hexadecimal string, and vice versa?
...tation. Its safe variant is about 30% faster than the current leader on my CPU. The unsafe variants are even faster. stackoverflow.com/a/24343727/445517
– CodesInChaos
Jun 21 '14 at 17:12
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how to listen to N channels? (dynamic select statement)
.... While waiting for an input channel to have a value this consumes all the CPU available. The whole point of select on multiple channels (without a default clause) is that it efficiently waits until at least one is ready without spinning.
– Dave C
Jun 29 '18 at...
Quickly find whether a value is present in a C array?
... this doesn't take into account memory delays.
Theory of operation: ARM's CPU design executes most instructions in one clock cycle, but the instructions are executed in a pipeline. C compilers will try to eliminate the pipeline delays by interleaving other instructions in between. When presented wi...
What are copy elision and return value optimization?
...truction and one matching destruction of the copy are omitted, thus saving CPU time, and one object is not created, thus saving space on the stack frame.
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Please explain the exec() function and its family
...ated with a file block or an entire file.
Process resource utilisation and CPU time consumed is set to zero for the child.
The child also doesn’t inherit timers from the parent.
But what about the child memory? Is a new address space created for a child?
The answers in no. After the fork(), bot...
How to measure time in milliseconds using ANSI C?
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Doesn't this measure cpu time and not wall time?
– krs013
Feb 1 '15 at 4:53
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How to install the Raspberry Pi cross compiler on my Linux host machine?
...torial also supports older Rasperry Pi (A, B, B+, Zero) based on the ARMv6 CPU.
See also:
GCC 8 Cross Compiler outputs ARMv7 executable instead of ARMv6
Set up the toolchain
There is no official git repository containing an updated toolchain (See https://github.com/raspberrypi/tools/issues/102).
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OPTION (RECOMPILE) is Always Faster; Why?
...Commits, or your Cross Product was fine for a smaller set but now takes up CPU and Memory as it scales larger, this may also be true for using DISTINCT, you are calling a function for every row, your key matches don't use an index because of CASTING type conversion or NULLS or functions... Too many...